How to get high quality Carbon Steel Flanges

2018-04-15

Carbon steel flanges, the main materials are carbon steels.
Carbon Steel Flanges are designed with care using current techniques under the visionary guidance of accomplished professionals at manufacturing unit. Offered range is stringently tested on various parameters of quality for ensuring flawlessness and defect free. These products are widely used in various industries and widely appreciated by clients for owning unmatchable characteristics. Offered range supplied in quality assured packaging material.

Carbon steel
• ASTM A105/A266 Gr.2 (high temperature carbon steel flanges)
• ASTM A350 LF1 to LF3 (low temperature carbon steel flanges)
• ASTM A694 Gr. F42/F52/F56/F60/F65 (high yield carbon steel flanges to match API 5L linepipes)

ASTM A694

The standards of A694 are more rigorous than the more common SA105N and SA350LF2 grades, providing more robust specifications for high-pressure fluid transmission in oil and gas piping systems. The increased demands on the physical properties of the steel create a stronger metal throughout the pressure range, from low to high temperature services.

ASTM A694 tensile requirements - How to get high quality Carbon Steel Flanges

Each grade in the A694 specification is assigned a number correlating to the minimum yield strength (in ksi units) required for that grade; GradeF52 for example requires a minimum Yield Strength of 52 ksi.

SA105N

This is a mild Carbon Steel that is not only one of the most common of the Carbon steels, but also one of the most common steels in the world. It is hard, not brittle or ductile, and has a low price point. SA105N is very common throughout many industries, and is even used with stainless Steel piping systems with the aid oflap joint End Rings

We stock large diameter (18” – 42”) SLIP-ON, Lap Joint, Weld Neck, and Blind Flanges in SA105N, in class 150 and 300, and can also source a variety of sizes and classes for longer lead times, from 12” to 60”.

Carbon Steel Flanges – Pressure and Temperature Ratings – Group 1.1

Maximum temperature and pressure ratings of flanges conforming dimensions ASME B16.5 and materials specification ASTM A-105

Gage Pressure (psi)
Temperature (^oF)	Flange Class
Temperature (^oF)	150	300	400	600	900	1500	2500
< 100	285	740	985	1480	2220	3705	6170
200	260	680	905	1360	2035	3395	5655
300	230	655	870	1310	1965	3270	5450
400	200	635	845	1265	1900	3170	5280
500	170	605	805	1205	1810	3015	5025
600	140	570	755	1135	1705	2840	4730
650	125	550	730	1100	1650	2745	4575
700	110	530	710	1060	1590	2655	4425
750	95	505	675	1015	1520	2535	4230
800	80	410	550	825	1235	2055	3430
850	65	320	425	640	955	1595	2655
900	50	230	305	460	690	1150	1915
950	35	135	185	275	410	685	1145
1000	20	85	115	170	255	430	715

Hydrostatic Test Pressure (psig)	450	1125	1500	2225	3350	5575	9275

The values are for materials Group 1.1

Pressure ratings Group 1.2 materials

1 psi (lb/in²) = 144 psf (lb_f/ft²) = 6,894.8 Pa (N/m²) = 6.895×10^-3 N/mm² = 6.895×10^-2 bar
t_C = 5/9 (t_F – 32)

SA350 LF2

This is a grade of Carbon Steel intended primarily for low-temperature service and requires notch toughness testing. Very similar to SA105N, this material is used in more industrial applications such as the oil and gas industries.

Chemical composition

C	0.3
Mn	0.6~1.35
P	0.035
S	0.04
Si	0.15~0.3
Ni	0.40
Mo	0.12
Cr	0.30
V	0.08

Mechanical properties

Tensile Strength, ksi [MPa]	70-95 [485-655]
Yield Strength, Min., ksi [MPa]	36 [250]
Elongation – 2 in. [50mm] / 4D, Min., %	30 / 22
Reduction of Area, Min., %	40.00
Brinell Hardness, max	187

Yaang can supply large diameter Flanges of all types in SA350LF2, from 18” to 60”, in a wide variety of pressure classes.

The A350 LF2 Line is often referred to as Carbon Steel Low Temp Fittings or Flanges

We carry a large inventory of Carbon Steel Flanges in many types and sizes.

Grades of Carbon steel flanges:

We shall be pleased to develop Non-Standard

ASTM A105, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2
ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70

Carbon Steel Forged Flanges

A flange is defined as a plate type device, normally round, that is attached to the end of a pipe, fitting, valve or other object to facilitate the assembly and disassembly of a piping system.

Flanges are manufactured in all the different materials to match the material of the pipe and fittings to which they are being attached. While some flanges are made of Cast Iron, the vast majority of flanges are forged carbon steel.

Forged steel flanges are made in seven primary ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500 & Class 2500.

Chemical Composition of ASTM A694

ASTM A694 Standard covers carbon and alloy steel forgings for pipe flanges, fittings, valves, and parts for high-pressure transmission service.

Grade	C	Mn	P	S	Si
ASTM A694 F42	0.26-0.265	1.60-1.64	0.025-0.030	0.025-0.030	0.15-0.35
ASTM A694 F52	0.26-0.265	1.60-1.64	0.025-0.030	0.025-0.030	0.15-0.35
ASTM A694 F60	0.26-0.265	1.60-1.64	0.025-0.030	0.025-0.030	0.15-0.35
ASTM A694 F65	0.26-0.265	1.60-1.64	0.025-0.030	0.025-0.030	0.15-0.35

Tensile Requirements

Combining values from the two systems may result in nonconformance with the standard.

Grade	Yield Strength (0.2 % Offset), min, ksi [MPa]	Tensile Strength min, ksi [MPa]	Elongation in 2 in. or 50 mm, min %
F42	42 [290]	60 [415]	20
F46	46 [315]	60 [415]	20
F48	48 [330]	62 [425]	20
F50	50 [345]	64 [440]	20
F52	52 [360]	66 [455]	20
F56	56 [385]	68 [470]	20
F60	60 [415]	75 [515]	20
F65	65 [450]	77 [530]	20
F70	70 [485]	82 [565]	18

Types of Carbon Steel Flanges

Carbon Steel Flanges are corrosion resistant and have a wide variety of uses. We carry variety of threaded flanges, weld neck flanges and slip on flanges and of course we can can custom build Carbon Steel Flanges to your specifications.

TYPES OF FLANGES

The most used flange types in Petro and chemical industry are:

SPECIAL FLANGES

Except the most used standard flanges, there are still a number of special flanges such as:

Orifice Flanges
Expander Flange
Spectacle Blind Flanges
Reducing Flange
Weldoflange / Nipoflange

Custom Carbon Steel Flanges

Carbon Steel Flanges are corrosion resistant and have a wide variety of uses. We carry a variety of threaded flanges, weld neck flanges and slip- on flanges and, of course, we can can custom build steel flanges to your specifications.

Carbon Steel Flanges Finished

Natural, Nickel Plated, Electro Polished Plated or any coating as per customer specification.
Any kind of special die casting sand gravity die lost wax shell moulding castings and cast parts casting produced to user specifications. We can be more competitive than Chinese castings and cast parts made in China Taiwan Asia Korea as traditional Indian expertise in Brass castings and Brass casting is superior and Indian Carbon Steel foundry / foundries are more competitive than other S.S. Carbon Steel foundries.

MEASUREMENTS

Flanges within the same standard can either be flat (commonly cast iron, ductile iron) or raised face (commonly cast steel and stainless steel). These flange tables cover the critical flange dimensions to help identify what standard you have.

Critical flange dimensions help to identify the standard

Pipe Size – Pipe flanges also have a corresponding pipe size, generally according to accepted standards.

Outside Diameter of Flange (OD) – this is measured from outer edge to opposing outer edge.

Pitch Circle Diameter (PCD) – this is a diameter that measures from the center of bolt hole to opposing bolt hole.

Flange Thickness – this measures only the thickness of the attaching outer rim, and does not include the part of the flange that holds the pipe.

INTERNATIONAL STANDARDS

Several organizations and associations have published specifications that provide dimensional information as well as pressure specifications at different temperatures.

DIN EN 1092-1

Many countries in the European Union (EU) mainly install flanges to the DIN EN 1092-1 (forged stainless or steel flanges).
This standard is very similar to the ASME flange standard. The EN 1092-1 standard incorporates a threaded flange to IOS7.1 instead of NPT. The different forms of flanges within the EN 1092-1 (European Norm Euro norm) is indicated within the flange name through the type. Different types of flanges have different standards, some are as follow:

TYPE OF FLANGE	EN STANDARD	DIN STANDARD
Blind Flange	Type 5	DIN 2527
Threaded Flange	Type 12	DIN 2558, 2565 – 2569
Weld Neck Flange	Type 11	DIN 2627 – 2638
Flat Flange	Type 1	DIN 2573, 2578
Lapped Flange	Type 2, 4	DIN 2641, 2622, 2655, 2656

Source: China Carbon Steel Flanges Manufacturer – Yaang Pipe Industry (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

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