Characteristics and applications of steel pipe

What is a stainless steel pipe?

Stainless steel pipe is one of the more standardized materials in the building and engineering industries. Stainless Steel Seamless Pipes is a hollow steel bar, a large number of pipes used for conveying fluids, such as oil, gas, water, gas, steam,heat exchanger,mechanical machine.

In addition, engaging in bending, torsional strength of the same, lighter, and they are also widely used in the manufacture of mechanical parts and engineering structures.

Also used in producing all kinds of conventional weapons, the barrel, artillery shells and so on…

Duplex pipes are stainless pipes containing the high amount of chromium and minimum amount of nickel.

duplex stainless steel pipe - Characteristics and applications of steel pipe

While Duplex 2205 is the most common duplex product we supply, we can also deliver Duplex 2304 and Duplex 2207 with reduced lead times as these alloys are stocked. Alloy 2205 (UNS S32305/S31803) is a 22% chromium, 3% molybdenum, 5-6% nickel, nitrogen alloyed duplex stainless steel pipe with high general, localized, and stress corrosion resistance properties in addition to high strength and excellent impact toughness.

Alloy 2205 provides pitting and crevice corrosion resistance superior to 316L or 317L austenitic stainless steel tube in almost all corrosive media. It also has high corrosion and erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic.

Standard: ASTM/ASME A789/SA789, A790/SA790

Steel Grade: UNS S32750, S31803, S32760 etc.

Material stainless steel grades:

Also known as “marine grade” stainless steel due to its increased ability to resist saltwater corrosion compared to type 304. SS316 is often used for building nuclear reprocessing plants.

  • 304/304L Stainless Steel
  • 316/316L Stainless Steel
  • 310S Stainless Steel
  • 317L Stainless Steel
  • 321/321H Stainless Steel
  • 410 Stainless Steel
  • Duplex 2205 (UNS S31803)

Characteristics and applications of hot extruded steel pipe

API SPEC 5CT steel pipes - Characteristics and applications of steel pipe

In recent years, the worldwide high-end seamless pipe market recovery and the country’s economic strength gradually increased, the hot extrusion production process of seamless steel pipe ushered in a new round of development opportunities.

Hot extruded pipe production process using hot extrusion method with three-stress deformation in the metal density is good, homogeneous, suitable for almost all varieties of steel production, particularly in the high-alloy steels difficult to deformation and various special-shaped production of the tube section has a special processing advantages. Hot extruded steel products because it has a performance advantage in the military, nuclear power, thermal power, aviation, mining, oil and petrochemical, and other key areas of the national economy and the high-end irreplaceable application prospects. Efforts to develop high-performance, high-tech and high value-added hot extruded pipe products, high-end steel pipe technology to promote national development and strengthening of comprehensive economic strength has far-reaching significance.

Hot extrusion process meets stringent product standards, widely used in military, nuclear power, petrochemical, and other cutting-edge areas of aviation and a variety of stainless steel tubes, high-quality high-temperature corrosion steel pipe, steel pipe and other steel titanium and titanium alloy products. These high-quality, high-precision, difficult deformation of specialty steel products, its production processes often require special smelting, casting, rolling, forging production and R & D capabilities, and includes cold rolling, heat treatment process including a series of tube processing capacity. Core areas of hot piercing and hot extrusion production process need to build a complete production line, a broad product line includes: pretreatment tube offline, online pre-heating and heating tube, inner tube, the outer surface of the glass powder lubrication after heat perforation / reaming, after reheating and the inner and outer surfaces of the glass powder lubricant into the hot extrusion process and thermal pressure I saw after cutting, hot extruded steel tube (long tube by heat Sawing online after) by a roller transported to the background, and then heat quenched or cooled in the cooling bed.

Depending on technical requirements for products, hot extruded pipe after production using continuous production process, but also through rolling, straightening, shot blasting, degreasing, pickling processes to deal with. And the need to set up a multi-level defect detection, complete finishing facilities, the use of computer control and management, in order to ultimately effectively ensure a variety of products to meet the process requirements and the absolute strict product quality standards.

The application and uses of carbon steel pipe

Carbon Steel Seamless Pipes - Characteristics and applications of steel pipe

Carbon steel pipe is the most commonly and widely used in the gas project field. 
Its main advantages are: high strength, good toughness, bearing stress, impact resistance and rigor, good plasticity, ease of welding and thermal processing, thin wall thickness, to save metal. But its poor corrosion resistance, need to have proper anti-corrosion measures. Steel pipe used in gas engineering are generally made of high quality low carbon steel (Q235) or low-alloy steel (16Mn).

Steel construction is the construction of a new type of energy saving and environmental protection system, known as the 21st century “green building”. The steel construction is light weight, high strength, good seismic performance, energy saving, recycling, building structure, in line with the requirements of the development of energy efficient building and sustained and healthy economic development. The biggest advantage of the steel structure is to bring people to the building function, sensory requirements and economic requirements of a perfect combination. Steel tube structure, with its superior performance in recent years, application of the rapid development of the range of applications involving almost all structural areas, including housing construction, bridges, dams, offshore platform structure and tower masts and so on.

Steel with hollow sections is conveying fluid, such as the transportation of oil, gas, gas, water and some solid materials, pipes, etc.. Compared with the round steel and other solid steel in the flexural torsional strength, light weight, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive transmission, bicycle rack and construction using steel scaffolding. Steel pipe manufacturing annular parts, can improve material utilization, and simplify the manufacturing process, saving material and machining time, such as rolling sleeve ring, jack sets, has been widely manufactured steel pipe.

Large-diameter steel pipe with good adhesion, corrosion resistance, can be resistant to acid, alkali and other chemical corrosion, non-toxic, does not rust, wear resistance, impact resistance, strong permeability, smooth pipe surface will not adhere to any substance, can reduce the transmission of resistance, large diameter steel pipe improve flow and transmission efficiency and reduce the delivery pressure losses. Solvent-free coating, no oozing substance, and thus will not the transmission medium of pollution in order to ensure the purity and health of the fluid at -40 ℃ to +80 ℃ range of thermal cycles used interchangeably, not aging. no cracks, and thus can be used in the cold zone and other harsh environment. Large-diameter steel pipe is pipe that outside diameter is above 1000MM, large diameter coated steel pipe is coated with plastic on the basis of large diameter spiral welded pipe and high-frequency welded pipe from the solvent-free coating, small-diameter steel pipe no oozing substance and therefore not pollution transport media, thus ensuring the purity and health of the fluid, -40 ℃ to +80 ℃ range of thermal cycles used interchangeably, no aging, no cracks, and thus in the cold zone and other harsh environments to use.

The large diameter coated steel pipes are widely used in tap water, natural gas, petroleum, chemical, pharmaceutical, telecommunications, electricity, large diameter steel marine engineering field generally less than the outer diameter of the tubes 89 are collectively referred to as small-diameter steel pipe.

Usage characteristics of thin-walled galvanized stainless steel tube

In building water distribution system, galvanized steel pipe has been over a hundred years glorious history and a variety of new plastic pipes and composite pipes have developed rapidly, but there are some deficiencies due to varying degrees, far from being able to fully meet the water supply pipe needs of the department and the state of drinking water and water quality requirements. Therefore, the experts predicted: the building water supply pipe will eventually be restored to the era of metal pipe. according to the application of foreign experience, wall stainless steel pipe for pipe is one of the best overall performance.

Domestic thin-walled 316 stainless steel tubes that promote the use of the time is ripe:
First, thin-walled stainless steel tube, the country began production in the late 1990s, the use of today’s pipe-and-coming in the field of newborn family have been widely used in building water supply and drinking water pipeline.

Second, the thin-walled stainless steel tube durable has been recognized by the engineering community, and the parties concerned are to reduce the wall thickness, reducing the price to proceed in order to facilitate further promotion. Especially small diameter stainless steel pipe, the price is not high, supporting the connection method, the pipe reliability and price are the main factors that determine its development. Domestic has been a developer in Sichuan, Guangdong, Zhejiang, Jiangsu and other places independently developed connection technology and pipe fittings, pipe promising.

With the implementation of China’s reform and opening-up policy, the national economy experienced rapid growth, urban housing, public buildings and tourist facilities to build a large number of new requirements on the hot water supply and domestic water supply. Water quality problems, there is growing attention, and are required to improve. Galvanized steel pipe is commonly used pipe because of its easy to corrosion under the influence of the relevant national policies, will gradually exit the stage of history, plastic pipe, composite pipe and copper pipe became the piping system used pipe.

However, in many cases, the stainless steel tube is more advantages, especially the wall thickness of only 0.6 ~ 1.2mm wall stainless steel pipe in high-quality drinking water systems, hot water system and will give top priority to safety, health water supply system, with safe, reliable, environmental health, economic application. Engineering practice at home and abroad has been proven to be one of the best overall performance of water supply system, a new, energy-saving and environment-friendly pipe water supply pipe is also a very competitive, improve water quality, improve people’s living standard will play no comparable to the role.

Application of ASTM A179 Cold Drawn Seamless Tubes

Cold Drawn Seamless Carbon Steel Tube ASTM A179 - Characteristics and applications of steel pipe

ASTM A179 cold drawn seamless carbon steel pipe is mainly used in various sectors of the metal structure facilities, mainly after the rust of steel pieces immersed in 440 – 460 ℃ melting zinc solution, so that the steel surface attached to the zinc layer, which play a preservative purpose.

Main application of ASTM A179 cold drawn seamless tubes.

This is an effective way of metal corrosion, the use of the main features are the following:
1. ASTM A179 cold drawn seamless pipe manufacturers with thick dense dense zinc layer covered in the cold drawn seamless tube surface, it can avoid cold drawn seamless tube matrix and any contact with the corrosion solution to protect the steel matrix from corrosion. In the general atmosphere, the surface of the zinc layer to form a layer of thin and dense zinc oxide surface, it is difficult to dissolve in water, so the steel matrix plays a protective role. If zinc oxide and other components of the atmosphere produce insoluble zinc salt, the anti-corrosion effect is more desirable.
2. With iron – zinc alloy layer, combined with dense, and with the unique anti-corrosion in the marine atmosphere and atmospheric atmosphere.
3. ASTM A179 cold drawn seamless pipe with a strong wear resistance due to the combination of solid, zinc – iron miscible.
4. Since zinc has good ductility, its alloy layer and steel base attached to a solid, so hot-rolled parts can be cold, rolling, drawing, bending and other molding without damage to the coating.
5. Hot-dip galvanized structural steel pipe, the equivalent of an annealing treatment, can effectively improve the mechanical properties of steel matrix to eliminate the steel forming welding stress, is conducive to the steel structure for turning.
6. The surface of cold drawn seamless pipe after hot galvanized is bright and beautiful.

7. Pure zinc layer is the most hot galvanized layer of galvanized layer, its nature is basically close to pure zinc, with ductility, so it is full of flexibility.

Chemistry Composition:

C, %
Mn, %
P, %
S, %
0.06-0.18
0.27-0.63
0.035 max
0.035 max
Mechanical Properties:
Tensile Strength, MPa
Yield Strength, MPa
Elongation, %
Hardness, HRB
325 min
180 min
35 min
72 max
Outside Diameter & Tolerance
Outside Diameter, mm
Tolerance, mm
3.2≤OD<25.4
±0.10
25.4≤OD≤38.1
±0.15
38.1<OD<50.8
±0.20
50.8≤OD<63.5
±0.25
63.5≤OD<76.2
±0.30
76.2
±0.38
Wall thickness & Tolerance
Outside Diamter, mm
Tolerance, %

3.2≤OD<38.1

+20/-0
38.1≤OD≤76.2
+22/-0

Length: 5800mm; 6000mm; 6096mm; 7315mm; 11800mm; and so on.
Max length: 27000mm, also U bending can be offered.

Seamless steel tubes in small calibers for high (low and medium) Pressure boilers and petro chemical industry
low high pipe - Characteristics and applications of steel pipeLow medium tubes are used as the pipes on the heated side of low and medium pressure boilers(normally with operating pressure not higher than 5.88Mpa) 
10, 20, 20G, 20MnG, 25MnG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 10Cr9Mo1VNb, SA210A1, SA210C, SA213 T11, SA213 T12, SA213 T22, SA213 T23, SA213 T91, SA213 T92, ST45.8/Ⅲ, 15Mo3, 13CrMo44, 10CrMo910etc.

Standard Size

Seamless steel tubes in small calibers for high(low and medium) Pressure boilers and petro chemical industry

  • GB3087 Chinese national standard
  • GB5310 Chinese national standard
  • ASME SA210 Boiler and pressure vessel code of ASME
  • ASME SA213 Boiler and pressure vessel code of ASME
  • DINl7175 Deutsches industrial standard~
Application

Used as the pipes on the heated side of low and medium pressure boilers(normally with operating pressure not higher than 5.88Mpa and operating temperature below 450 oC), as the pipes on the heated sides of high·pressure boilers, economizers, overheaters, reheaters and pipes for petrochemical industry(with the operating pressure above 9.8Mpa and operating temperature ranging between 450C-650C1

Diamensional tolerances of Cold-rolled tubes:

Outer diameters Wall thickness
Tube sizes(mm) Tolerances(mm) Tube sizes (mm) Tolerances(mm)
>30~50 ±0.3 >3~20 ±10%

Mechanical properties:

Standard codes
Models of steel tubes
Tensite strength(MPa)
Yield strength(MPa)
Elongation(%)
Hardness
GB3087 10 335~475 ≥195 ≥24 /
20 410~550 ≥245 ≥20 /
GB5310 20G 410~550 ≥245 ≥24 /
20MnG ≥415 ≥240 ≥22 /
25MnG ≥485 ≥275 ≥20 /
15CrMoG 440~640 ≥235 ≥21 /
12Cr2MoG 450~600 ≥280 ≥20 /
12Cr1MoVG 470~640 ≥255 ≥21 /
12Cr2MoWVTiB 540~735 ≥345 ≥18 /
10Cr9Mo1VNb ≥585 ≥415 ≥20 /
ASME SA210 SA210A-1 ≥415 ≥255 ≥30 ≤143HB
SA210C ≥485 ≥275 ≥30 ≤179HB
ASME SA213 SA213 T11 ≥415 ≥205 ≥30 ≤163HB
SA213 T12 ≥415 ≥220 ≥30 ≤163HB
SA213 T22 ≥415 ≥205 ≥30 ≤163HB
SA213 T23 ≥510 ≥400 ≥20 ≤220HB
SA213 T91 ≥585 ≥415 ≥20 ≤250HB
SA213 T92 ≥620 ≥440 ≥20 ≤250HB
DIN17175 ST45.8/Ⅲ 410~530 ≥255 ≥21 /
15Mo3 450~600 ≥270 ≥22 /
13CrMo44 440~590 ≥290 ≥22 /
10CrMo910 480~630 ≥280 ≥20 /
Chemical composition:
Standard codes
Models of steel tubes
Chemical compositions (%)
C
Si
Mn
P
S
Cr
Mo
Cu
Ni
V
Al
W
Ti
Nb
N
GB3087
10
0.07~0.13
0.17~0.37
0.38~0.65
≤0.030
≤0.030
0.3~0.65
/
≤0.25
≤0.30
/
/
20
0.17~0.23
0.17~0.37
0.38~0.65
≤0.030
≤0.030
0.3~0.65
/
≤0.25
≤0.30
/
/
GB5310
20G
0.17~0.24
0.17~0.37
0.35~0.65
≤0.030
≤0.030
≤0.25
≤0.15
≤0.20
≤0.25
≤0.08
20MnG
0.17~0.24
0.17~0.37
0.70~1.00
≤0.030
≤0.030
≤0.25
≤0.15
≤0.20
≤0.25
≤0.08
25MnG
0.18~0.24
0.17~0.37
0.80~1.10
≤0.030
≤0.030
≤0.25
≤0.15
≤0.20
≤0.25
≤0.08
15CrMo
0.12~0.18
0.17~0.37
0.40~0.70
≤0.030
≤0.030
0.80~1.10
0.40~0.55
≤0.20
≤0.30
12Cr2MoG
0.08~0.15
≤0.50
0.40~0.70
≤0.030
≤0.030
2.00~2.50
0.90~1.20
≤0.20
≤0.30
12Cr1MoV
0.08~0.15
0.17~0.37
0.40~0.70
≤0.030
≤0.030
0.90~1.20
0.25~0.35
≤0.20
≤0.30
0.15~0.30
12Cr2MoWVTiB
0.08~0.15
0.45~0.75
0.45~0.65
≤0.030
≤0.030
1.60~2.10
0.50~0.65
≤0.20
≤0.30
0.28~0.42
0.30~0.55
0.08~0.15
B 0.002~0.008
10Cr9Mo1VNb
0.08~0.12
0.20~0.50
0.30~0.60
≤0.020
≤0.010
8.00~9.50
0.85~1.05
≤0.20
≤0.40
0.18~0.25
≤0.015
0.06~0.10
0.03~0.07
ASME SA210
SA210A-1
0.13~0.19
≥0.1
0.45~0.65
≤0.030
≤0.030
SA210C
0.18~0.24
≥0.1
0.80~1.10
≤0.030
≤0.030
ASME SA213
SA213 T11
0.05~0.15
0.50~1.0
0.30~0.60
≤0.030
≤0.030
1.00~1.50
0.50~1.00
SA213 T12
0.05~0.15
≤0.50
0.30~0.61
≤0.030
≤0.030
0.80~1.25
0.44~0.65
SA213 T22
0.05~0.15
≤0.50
0.30~0.60
≤0.030
≤0.010
1.90~2.60
0.87~1.13
SA213 T23
0.04~0.10
≤0.50
0.10~0.60
≤0.030
≤0.030
1.90~2.60
0.05~0.30
≤0.030
1.45~1.75
B 0.0005~0.006
0.02~0.08
≤0.040
SA213 T91
0.08~0.12
0.20~0.50
0.30~0.60
≤0.020
≤0.010
8.00~9.50
0.85~1.05
≤0.40
0.18~0.25
≤0.015
0.06~0.10
0.03~0.07
SA213 T92
0.07~0.13
≤0.50
0.30~0.60
≤0.020
≤0.010
8.50~9.50
0.30~0.60
≤0.40
0.15~0.25
≤0.015
1.50~2.00
B 0.001~0.006
0.04~0.09
0.03~0.07
DIN 17175
ST45.8/
≤0.21
0.10~0.35
0.40~1.20
≤0.040
≤0.040
15Mo3
0.12~0.20
0.10~0.35
0.40~0.80
≤0.035
≤0.035
0.25~0.35
13CrMo44
0.10~0.18
0.10~0.35
0.40~0.70
≤0.035
≤0.035
0.70~1.10
0.45~0.65
10CrMo910
0.08~0.15
≤0.50
0.30~0.70
≤0.025
≤0.020
2.00~2.50
0.90~1.10
≤0.30
≤0.30
≤0.015

Stainless steel tube for heat exchanger

stainless heat exchange - Characteristics and applications of steel pipe

Heat exchanger tube in an extensive range of austenitic stainless steels, duplex stainless steels, nickel alloys, titanium and zirconium, suitable for all types of heat exchangers, such as seawater coolers, condensers, evaporators, heaters and reheaters.

Heat exchanger Tubes are used in all types of process industries. Characteristic requirements are: bead worked weld, fixed lengths and extensive testing.

In order to meet the demand for rapid delivery, we have a strip stock with both standard and special grades of steel in the most common thicknesses.

We offer the market’s widest selection of stainless steel grades and has extensive experience of manufacturing heat exchanger tubes

Surface protection: Unless otherwise stated in order tubes are delivered with inner and outer surfaces temporarily protected with a film of light mineral oil.

Tubes ends: The tubes are supplied plain, square cut and on request the tubes can be deburred.

Seamless Pipes and Tubes for Pressure Applications

DIN 1629 seamless pipe - Characteristics and applications of steel pipe

DIN 1629 applications the overheated boilers, as minimum thickness ferrite and seamless steel pipes, and as heat exchangers via austenitic pipes.

THE EN 10216 COMPRISES SEVERAL PARTS. THE PARTS THAT ARE RELEVANT TO US ARE AS FOLLOWS:

  • EN 10216 Part 1: non-alloy pipes with specified properties at room temperature
  • EN 10216 Part 2: non-alloy pipes with specified properties at higher temperatures
  • EN 10216 Part 3: alloy pipes made from fine-grained steel for any temperature
en 10216 1 seamless tube - Characteristics and applications of steel pipe

This part of EN10216 may also be applied for tubes of non-circular cross section; necessary modification should be agreed a time of enquiry and order.

Some examples:

EN 10216-1, QUALITY P235TR2 (FORMERLY DIN 1629, ST.37.0)

  • P = Pressure
  • 235 = minimum yield strength in N/mm2
  • TR2 = quality with specified properties relating to aluminum content, impact values and inspection and test requirements. (In contrast to TR1, for which this is not specified).

EN 10216-2, QUALITY P235 GH (FORMERLY DIN 17175, ST.35.8 CL. 1, BOILER PIPE)

  • P = Pressure
  • 235 = minimum yield strength in N/mm2
  • GH = tested properties at higher temperatures

EN 10216-3, QUALITY P355 N (MORE OR LESS EQUIVALENT TO DIN 1629, ST.52.0)

  • P = Pressure
  • 355 = minimum yield strength in N/mm2
  • N = normalized*

* Normalized is defined as: normalized (warm) rolled or standard annealing (at a min temperature of 930°C). This applies to allqualities designated by the letter ‘N’ in the new Euro Standards.

Pipes: the following standards are replaced by DIN EN

PIPES FOR PRESSURE APPLICATIONS OLD STANDARD

Execution Norm Steel grade
Welded DIN 1626 St.37.0
Welded DIN 1626 St.52.2
Seamless DIN 1629 St.37.0
Seamless DIN 1629 St.52.2
Seamless DIN 17175 St.35.8/1
Seamless ASTM A106* Grade B
Seamless ASTM A333* Grade 6
PIPES FOR PRESSURE APPLICATIONS NEW STANDARD
Execution Norm Steel grade
Welded DIN EN 10217-1 P235TR2
Welded DIN EN 10217-3 P355N
Seamless DIN EN 10216-1 P235TR2
Seamless DIN EN 10216-3 P355N
Seamless DIN EN 10216-2 P235GH
Seamless DIN EN 10216-2 P265GH
Seamless DIN EN 10216-4 P265NL

* ASTM standards will remain valid and will not be replaced by Euronorms in the near future

Applications of spiral welded steel pipes

Spiral welded steel pipes are widely used in Oil, Natural Gas, Water and other flammable & nonflammable liquid conveyance and distribution pipelines, steel structures for construction and other general purposes by means of their wide size range.

Spiral Submerged-arc Welded steel pipe technological process

There are nine modernized product lines in our company with the yield capacity of 1000 thousands tons of B-X80 steel pipe of φ219-φ3200mm, WT5-30mm.

ssaw usage bridge - Characteristics and applications of steel pipe
Bridge
ssaw usage underground tunnel - Characteristics and applications of steel pipe
Underground Tunnel
ssaw usage high pressure cylinders - Characteristics and applications of steel pipe
High-pressure cylinders
ssaw usage harbour oil - Characteristics and applications of steel pipe
Harbour oil
ssaw usage airporte - Characteristics and applications of steel pipe
Airport
ssaw usage construction machinery - Characteristics and applications of steel pipe
Underground Tunnel
ssaw usage natatorium - Characteristics and applications of steel pipe
Natatorium
ssaw usage ship building - Characteristics and applications of steel pipe
Ship building
ssaw usage grid - Characteristics and applications of steel pipe
Grid

Seamless steel tubes for oil casing and tubing

Seamless steel tubes for oil casing and tubing application for onshore and offshore Oil & Gas applications in the domains of Exploration, Production and Processing.

Standard:

API SPEC 5CT Standard of American Petroleum Institute

This International Standard is applicable to the following connections in accordance with ISO 10422 or API Spec 5B:

Application:

casing tubing - Characteristics and applications of steel pipeSeamless steel tubes for oil casing and tubing in oil wells

Model N0.of steel tubes:

J55,N80,L80,P110 etc.

  • short round thread casing (STC);
  • long round thread casing (LC);
  • buttress thread casing (BC);
  • extreme-line casing (XC);
  • non-upset tubing (NU);
  • external upset tubing (EU);
  • integral joint tubing (IJ).

This International Standard specifies the technical delivery conditions for steel pipes (casing, tubing, plain end casing liners and pup-joints) and accessories.

For such connections, this International Standard specifies the technical delivery conditions for couplings and thread protection.

For pipes covered by this International Standard, the sizes, masses, wall thicknesses, grades and applicable end finishes are defined.

This International Standard may also be applied to tubulars with connections not covered by ISO/API standards.

Diamensional tolerances:

Types Outer diameter Wall thickness
Cold-rolled tubes Tube sizes(mm) Tolerances(mm) Tolerances(mm)
<114.3 ±0.79 -12.5%
≥114.3 -0.5%,+1%

Mechanical properties of API SPEC 5CT:

Models of steel tubes
Tensite strength(MPa)
Yield strength(MPa)
Hardness
J55 ≥517 379~552
K55 ≥517 ≥655
N80 ≥689 552~758
L80(13Cr) ≥655 552~655 ≤241HB
P110 ≥862 758~965

Chemical composition of API SPEC 5CT:

Models of steel tubes Chemical compositions (%)
C Si Mn P S Cr Ni Cu Mo V Als
J55K55(37Mn5) 0.34~0.39 0.20~0.35 1.25~1.50 ≤0.020 ≤0.015 ≤0.15 ≤0.20 ≤0.20 ≤0.020
N80(36 Mn2V) 0.34~0.38 0.20~0.35 1.45~1.70 ≤0.020 ≤0.015 ≤0.15 0.11~0.16 ≤0.020
L80(13Cr) 0.15~0.22 ≤1.00 0.25~1.00 ≤0.020 ≤0.010 12.0~14.0 ≤0.20 ≤0.20 ≤0.020
P110(30CrMo) 0.26~0.35 0.17~0.37 0.40~0.70 ≤0.020 ≤0.010 0.80~1.10 ≤0.20 ≤0.20 0.15~0.25 ≤0.08 ≤0.020

Seamless steel pipes for project service

The seamless steel pipes used for project service include coneying water, pertroleum, gas and other common fluides.

astm a53 pipe - Characteristics and applications of steel pipe
ASME SA53 is a carbon steel alloy, used for structural steel pipe. The alloy specifications are set by ASTM International, in specification ASTM A53/A53M.

Seamless steel pipe are ubiquitous and can be found underground and within residential walls, laboratories, and commercial and industrial structures. Seamless steel pipe transport fluids including water, natural gas, waste and air. Three manufacturing methods exist to produce steel pipes. Seamless steel pipes are produced using an extrusion mold.

astm a106 pipe - Characteristics and applications of steel pipe
ASTM A106 Covers seamless carbon steel nominal wall pipe for high-temperature service, suitable for bending flanging and similar forming operations.

ASTM A106 Seamless Pressure Pipe (also known as ASME SA106 pipe) is commonly used in the construction of oil and gas refineries, power plants, petrochemical plants, boilers, and ships where the piping must transport fluids and gasses that exhibit higher temperatures and pressure levels.
Steel pipes Size (mm):

  • Outer Dimensions.: 10.3mm – 114.3mm
  • Wall Thickness: 0.8 mm – 12 mm
  • Length: max 16000mm

Steel grade:

  • ASTM A106 Grade A, Grade B, Grade C
  • ASTM A53
  • API 5L Gr.B

Well packing:
Packed in wooden crates, wrapped in plastic, and suitably protected for sea-worthly delivery or as requested.
Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.
Please view the real informations of the standard as below:

Application: apply to coneying water, pertroleum, gas and other common fluides.

API 5L Grade B Steel pipe - Characteristics and applications of steel pipe
API 5L Gr.B Seamless steel pipes

This International Standard specifies requirements for the manufacture of two product specification levels (PSL 1 and PSL 2) of seamless and welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries. 

Seamless pipes for high temperature and pressure service

seamless steel pipes for high temperature and pressure service - Characteristics and applications of steel pipe

High Temperature service tube are typically knows as heat exchanger tube, which operates at 400 degree Celsius to 1100 degree Celsius.

High Temperature service Alloy Steel tube are known as Chrome Moly pipe. Basically there are two Type of High Temperature Steel Pipe: 1. High Temperature Carbon Steel pipe 2. High Temperature Alloy Steel pipe

High Temperature Carbon Steel tube

ASTM A179, A192A210 specification covers Carbon Steel Seamless tube for high-temperature service. These pipe are used heat exchangers, condensers, High Temperature Material should furnish to Specification A 530.

  • GB5310-2008 is applicable to seamless tubes for making steam boiler whose pressure is high or higher and seamless tubes used as pipelines.
  • ASTM A179 / A179M – 90a Standard Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes
  • ASTM A192 / A192M Standard Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service
  • ASTM A210/ASME SA210 Standard Specification for Seamless Medium-Carbon Steel Boiler and Superheater Tubes.

High Pressure and Temperature Service Seamless Pipes are application for heating-pipelines, containers, coal-saving devices superheaters and reheaters of high temperature and high press boiler by the main standard:

Application:

  • heating-pipelines, containers, coal-saving devices superheaters and reheaters of high temperature and high press boiler(P>=9.8MPa, T>450oC)
Available Sizes:
  • O.D.: from 3/4 to 20 inch
  • W.T.: 0.102 to 4inch (2.6 to 100 mm)
  • Length: max 16000mm

Seamless steel tubes for low-temperature service

seamless steel tubes for low temperature service - Characteristics and applications of steel pipe
This specification covers seamless and welded steel pipe for low temperature service.

Low temperature service seamless pipes are application for low-temperature pressure container piping by the main standard GB/T18984-2003, ASTM/ASME A/SA333 with steel grade 16MnDG, 10MnDG, A333 Gr.1, Gr.3, Gr.6

GB/T18984-2003 standard suitable for -49 to -148 degrees F cryogenic pressure vessel piping, and low-temperature heat exchanger tubes seamless steel pipe.

ASTM/ASME A/SA-333 Grades allow for cold temperature service to minus 150 degrees F. Material is always provided in the normalized condition at a minimum and Charpy Impact tested to a specific temperature range to assure compliance with the required service temperature.

Chemical Composition(%)
Grade C Si Mn P(max) S Ni Mo V
16MnDG 0.12-0.20 0.20-0.55 1.20-1.60 0.025 0.025  –  –  –
10MnDG <=0.13 0.17-0.37 <=1.35 0.025 0.025  –  – <=0.07
A333 Gr.1 %

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