How to get high quality stainless steel flange

What is a stainless steel flange?

A stainless steel flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification. stainless steel flanges are usually welded or screwed. stainless steel flanged joints are made by bolting together two stainless steel flanges with a gasket between them to provide a seal.

What is stainless steel?

This crystal structure makes such steels non-magnetic and less brittle at low temperatures. For higher hardness and strength, carbon is added. When subjected to adequate heat treatment these steels are used as razor blades, cutlery, tools etc.

Significant quantities of manganese have been used in many stainless steel compositions. Manganese preserves an austenitic structure in the steel as does nickel, but at a lower cost.

The AISI defines the following ASTM A312 grades among others:

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.

CHEMICAL COMPOSITION OF STAINLESS STEEL

Composition, %

Grade

C

Mn

P

S

Si

Ni

Cr

Mo

Nb

Ti

Others

F304(1)

0.08

2.0

0.045

0.030

1.0

8.0-11.0

18.0-20.0

 

 

 

 

F304H

0.04-0.10

2.0

0.045

0.030

1.0

8.0-11.0

18.0-20.0

 

 

 

 

F304L(1)

0.030

2.0

0.045

0.030

1.0

8.0-13.0

18.0-20.0

 

 

 

 

F304N(2)

0.08

2.0

0.045

0.030

1.0

8.0-10.5

18.0-20.0

 

 

 

 

F304LN(2)

0.030

2.0

0.045

0.030

1.0

8.0-10.5

18.0-20.0

 

 

 

 

F309H

0.04-0.10

2.0

0.045

0.030

1.0

12.0-15.0

22.0-24.0

 

 

 

 

F310

0.25

2.0

0.045

0.030

1.0

19.0-22.0

24.0-26.0

 

 

 

 

F310H

0.04-0.10

2.0

0.045

0.030

1.0

19.0-22.0

24.0-26.0

 

 

 

 

F310MoLN

0.030

2.0

0.030

0.015

0.40

21.0-23.0

24.0-26.0

2.0-3.0

 

 

N 0.10-0.16

F316

0.08

2.0

0.045

0.030

1.0

10.0-14.0

16.0-18.0

2.0-3.0

 

 

 

F316H

0.04-0.10

2.0

0.045

0.030

1.0

10.0-14.0

16.0-18.0

2.0-3.0

 

 

 

F316L(1)

0.030

2.0

0.045

0.030

1.0

10.0-15.0

16.0-18.0

2.0-3.0

 

 

 

F316N(2)

0.08

2.0

0.045

0.030

1.0

11.0-14.0

16.0-18.0

2.0-3.0

 

 

 

F316LN(2)

0.030

2.0

0.045

0.030

1.0

11.0-14.0

16.0-18.0

2.0-3.0

 

 

 

F316Ti

0.08

2.0

0.045

0.030

1.0

10.0-14.0

16.0-18.0

2.0-3.0

 

(3)

N 0.10 max

F317

0.08

2.0

0.045

0.030

1.0

11.0-15.0

18.0-20.0

3.0-4.0

 

 

 

F317L

0.030

2.0

0.045

0.030

1.0

11.0-15.0

18.0-20.0

3.0-4.0

 

 

 

F321

0.08

2.0

0.045

0.030

1.0

9.0-12.0

17.0-19.0

 

 

(4)

 

F321H

0.04-0.10

2.0

0.045

0.030

1.0

9.0-12.0

17.0-19.0

 

 

(5)

 

F347

0.08

2.0

0.045

0.030

1.0

9.0-13.0

17.0-20.0

 

(6)

 

 

F347H

0.04-0.10

2.0

0.045

0.030

1.0

9.0-13.0

17.0-20.0

 

(7)

 

 

F348

0.08

2.0

0.045

0.030

1.0

9.0-13.0

17.0-20.0

 

(6)

 

Co 0.20
Ta 0.10

F348H

0.04-0.10

2.0

0.045

0.030

1.0

9.0-13.0

17.0-20.0

 

(7)

 

Co 0.20
Ta 0.10

Notes:

1.    Grades F304, F304L, F316, and F316L shall have a maximum Nitrogen of 0.10%.

2.    Grades F304N, F316N, F304LN, and F316LN shall have a Nitrogen of 0.10 to 0.16%.

3.    Grade F316Ti shall have a Titanium content five times above the Carbon plus Nitrogen and not more than 0.70%.

4.    Grade F321 shall have a Titanium content five times above the Carbon and not more than 0.70%.

5.    Grade F321H shall have a Titanium content four times above the Carbon and not more than 0.70%.

6.    Grades F347 and F348 shall have a Niobium content ten times above the Carbon and not more than 1.10%.

7.    Grades F347H and F348H shall have a Niobium content above than eight times the Carbon and not more than 1.10%.

Stainless steels are also classified by their crystalline structure:

  • Austenitic stainless steels comprise over 70% of total stainless steel production. They contain a maximum of 0.15% carbon, a minimum of 16% chromium and sufficient nickel and/or manganese to retain an austenitic structure at all temperatures from the cryogenic region to the melting point of the alloy. A typical composition is 18% chromium and 10% nickel, commonly known as 18/10 stainless is often used in flatware. Similarly 18/0 and 18/8 is also available. ¨Superaustenitic〃 stainless steels, such as alloy AL-6XN and 254SMO, exhibit great resistance to chloride pitting and crevice corrosion due to high Molybdenum contents (>6%) and nitrogen additions and the higher nickel content ensures better resistance to stress-corrosion cracking over the 300 series. The higher alloy content of “Superaustenitic” steels means they are fearsomely expensive and similar performance can usually be achieved using duplex steels at much lower cost.
  • Ferritic stainless steels are highly corrosion resistant, but far lessdurable than austenitic grades and cannot be hardened by heat treatment. They contain between 10.5% and 27% chromium and very little nickel, if any. Most compositions include molybdenum; some, aluminium or titanium. Common ferritic grades include 18Cr-2Mo, 26Cr-1Mo, 29Cr-4Mo, and 29Cr-4Mo-2Ni.
  • Martensitic stainless steels are not as corrosion resistant as the other two classes, but are extremely strong and tough as well as highly machineable, and can be hardened by heat treatment. Martensitic stainless steel contains chromium (12-14%), molybdenum (0.2-1%), no nickel, and about 0.1-1% carbon (giving it more hardness but making the material a bit more brittle). It is quenched and magnetic. It is also known as “series-00” steel.
  • Duplex stainless steels have a mixed microstructure of austenite and ferrite, the aim being to produce a 50:50 mix although in commercial alloys the mix may be 60:40. Duplex steel have improved strength over austenitic stainless steels and also improved resistance to localised corrosion particularly pitting, crevice corrosion and stress corrosion cracking. They are characterised by high chromium and lower nickel contents than austenitic stainless steels.

Surface Treatments of Stainless Steel Flanges

Stainless steel is a very common material for flanges, and the commonly used surface treatments of stainless steel flanges include surface clear whitening treatment, surface mirror brightening treatment and surface coloring treatment.

Surface clear whitening treatment
Stainless steel flanges have to go through the bending process, binding process, welding process, artificial surface roasted heating treatment, etc., which will result in the black oxide skin on the surface of stainless steel flanges. The main composition of the black oxide skin is NiCr2O4 and NiF, and the black oxide used to be removed by the strong corrosive hydrofluoric acid and nitric acid. However, this method has the disadvantages of high costs, strong corrosion, causing damage to people’s health and bringing pollution to the environment, so it was gradually eliminated.

At present, there are two main ways to remove the oxide skin on surfaces of stainless steel flanges.
⑴ The sandblasting (shot blasting) method 
This method is shooting micro glass beads on surfaces stainless steel flanges so as to remove the black oxide skin.

⑵ The chemical method
This method is using the non-polluting pickling passivation paste and the normal temperature non-toxic cleaning solution with inorganic additives to immerse and then remove the black oxide skin on the surface, achieving the purpose of surface clear whitening treatment of stainless steel flanges. This method is suitable for the flanges which are large or have complex structures.

Surface mirror brightening treatment
According to the complexity of stainless steel flange products as well as different users’ requirements, surface mirror brightening treatment of stainless steel flanges can be divided into mechanical polishing, chemical polishing, electrochemical polishing, etc., which can make stainless steel flanges have the specular gloss. 

Surface coloring treatment
Surface coloring treatment of stainless steel flanges not only gives stainless steel flanges a variety of colors and increases the flanges’ types, but also improves the flanges’ wear resistance and corrosion resistance.

Several types of surface coloring treatments of stainless steel flanges are listed as follows.
⑴ The chemical oxidation coloring method 
In a specific solution, the color of the film is formed by chemical oxidation. 

⑵ The electrochemical oxidation coloring method
In a specific solution, the color of the film is formed by electrochemical oxidation.

⑶ The ion deposition oxide coloring method
Put stainless steel flanges on the vacuum coating machine for vacuum evaporation plating. Because of the large investment and the high cost of this method, it is not recommended for small batch of stainless steel flange products.

⑷ The high temperature oxidation coloring method
Immerse the stainless steel flanges in the fused salt, and keep the parameters of the stainless steel flanges so that the oxide film with the certain thickness can form on the surfaces of flanges and flanges can show a variety of different colors.

⑸ The gas pyrolysis coloring method
This method is relatively complex, which makes it seldom applied to the industry.

Types of Stainless Steel Flanges:

Stainless Steel Blind Plate Flanges

stainless steel blind plate flanges - How to get high quality stainless steel flange

We carry a full line of stainless steel blind plate flanges, which are manufactured without a bore and are applied to block the end of a pipe system or valve.

  • Types: Raised Face Blind
  • Sizes: 1/2″ – 36″ +
  • Bores: S/5s – XXH
  • Pressures: 150 – 300 – 600

Stainless Steel Raised Face Blind Flanges

stainless steel raised face blind flanges - How to get high quality stainless steel flange

The raised face concentrates more pressure on a smaller area, which provides increased containment capability. Stainless Steel Raised Face Blind Flanges Stainless Steel Raised Face Blind Flanges

  • Types: Raised Face Blind
  • Sizes: 1/2″ – 36″ +
  • Bores: S/5s – XXH
  • Pressures: 150 – 300 – 600

Stainless Steel Lap Joint Flanges

stainless steel lap joint flanges - How to get high quality stainless steel flange

Stainless steel lap joint flanges are used in less pressurized piping systems
Lap Joint Flanges (LJ Flanges) are used on piping fitted with lapped pipe or with lap joint stub ends the combined initial cost of the two items being approximately one-third higher than that of comparable welding neck flanges.

  • Types: Raised Face Blind
  • Sizes: 1/2″ – 36″ +
  • Bores: S/5s – XXH
  • Pressures: 150 – 300 – 600

Stainless Steel Slip on Plate Flanges

stainless steel slip on plate flanges - How to get high quality stainless steel flange

Slip-On Pipe Flanges. As made obvious by their name, these pipe flanges slip over the pipe.

Yaang offers a large inventory of stainless steel flanges. We carry a full line of stainless steel slip on flanges, used to block the end of a pipe system or valve. Our flange experts can help identify which flange is right for your application.

Stainless Steel Raised Face Socket Weld Flanges

stainless steel raised face socket weld flanges - How to get high quality stainless steel flange

Socket-Weld Flanges has a female socket in which pipe is fitted. Fillet welding is done from outside on the pipe. 

Our flange experts can help identify which flange is right for your application.

Stainless Steel Raised Face Threaded Flanges

stainless steel raised face threaded flanges - How to get high quality stainless steel flange

Threaded Flanges are also known as screwed flange, and it is having a thread inside the flange bore which fits on the pipe with matching male thread on the pipe.

Included in our inventory is a full line of stainless steel raised face threaded flanges, used to block the end of a pipe system or valve with the largest advantage of being able to add and remove without welding.

Stainless Steel Raised Face Weld Neck Flanges

stainless steel raised face weld neck flanges - How to get high quality stainless steel flange

The Welding neck flanges is normally referred to as the high hub flange.

We carry a full line of stainless steel raised face weld neck flanges, used to block the end of a pipe system or valve. Our flange experts can help identify which flange is right for your application.

Grades of stainless:

We shall be pleased to develop Non-Standard

  • ASTM A403 WP316/316L
  • ASTM A403 WP304/304L
  • ASTM A182 F304, F304L, F316,  F316L,  F321

Forged stainless steel flange dimensions conform to ASME B16.5 NPT Threads conform to ASME B1.20.1 Up to 12″ Listed – Contact us for pricing on larger sizes 304/304L & 316/316L Stainless Steel Listed

Stainless Steel Flanges Features accord to standard:

Stainless 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.

Stainless 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 Stainless Steel foundry / foundries are more competitive than other S.S. Stainless Steel foundries.

Custom Stainless Steel Flanges

Stainless 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.

Source: China Stainless Steel Flange 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.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com
Please notice that you might be interested in the other technical articles we’ve published:
  • What are orifice flanges
  • What is a Blind Flange

  • What are reducing flanges

  • HOW TO GET HIGH QUALITY PIPE FITTINGS

  • How to get high quality bellow expansion joints

  • How to get high quality flanges
  • How to get high quality Welding Neck Flanges

  • How to get high quality Threaded Flanges

  • How to get high quality Spectacle Blind Flanges

  • How to get high quality spacer rings and spade flanges

  • How to get high quality socket welding flanges
  • How to get high quality slip on flanges

  • How to get high quality ring type joint flanges

  • How to get high quality plate flanges

  • How to get high quality lap joint flanges

  • How to get high quality orifice flanges
  • How to get high quality blind flanges

  • How to get high quality Threaded Flanges

  • How to get high quality Spectacle Blind Flanges

  • How to get high quality spacer rings and spade flanges

  • How to get high quality alloy flanges

  • HOW TO GET HIGH QUALITY EXPANDER FLANGES

  • HOW TO GET HIGH QUALITY LONG WELD NECK FLANGES

  • How to get high quality Weldoflange or Nipoflange

  • How to get high quality reducing flange

References:

  • https://www.yaang.com

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