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An Expert’s Guide to Stainless Steel 904l Flanges

Views: 0     Author: Wang     Publish Time: 2024-10-29      Origin: Site

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What are the Features of 904L?

Stainless steel 904L (UNS N08904) is a superaustenitic stainless steel designed for corrosion and pitting resistance in a wide range of process environments. This grade is written as 1.4539 or X1NiCrMoCu25-20-5 according to EN norm and it is written as UNS S08904 according to UNS norm. 904L stainless grade contains very high level of nickel, molibdenium, chromium and combinations of all these elements makes this stainless steel grade very resistant to corrosion resistance. 904L material is one of the strongest material to corrosion at JN Alloy warehouse and if this grade is not enough, then nickel alloys or titanium alloys has to be choosen, because rest of the stainless steel grades will not survive if 904L is not enough. 904L has also a very good anti-magnetic property and for alot of applicatipons, this is another reason to use 904L stainless steel grade. 1.4539 stainless steel has a very low content of carbon and low carbon also improving this grade's corrosion resistance level.


Alloy 904L is used extensively in the chemical process industry including the production of phosphate-based fertilizers.The nitrogen, molybdenum and chromium contents in stainless steel 904L have a direct bearing on their resistance to pitting and crevice corrosion and in the case of 904L this parameter is good. However, the 6% molybdenum austenitic grades or super- duplex grades do display superior resistance to these forms of localised corrosion.The high chromium content promotes and maintains a passive film which protects the material in many corrosive environments.904L has a greater resistance to precipitation of ferrite and sigma phases on cooling and welding than other stainless steels containing molybdenum such as 316L and 317L. There is no risk of intercrystalline corrosion on cooling or welding due to the low carbon content. Its maximum service temperature is at 450°C.


904L may considered as a high performance austenitic stainless steel when compared with the general purpose austenitics such as 304 and 316. It has the characteristic high ductility and formability and good weldability of the austenitic grades, but its use is primarily a consequence of its corrosion resistance rather than its mechanical properties. Applications for the alloy range from the chemical and mineral processing industries to pollution control and water treatment. A primary feature of stainless steel 904L is its very good corrosion resistance in dilute sulphuric acid across the full range of concentrations up to 35° C. It also has useful resistance to a number of other inorganic acids, but its performance may be limited when halide ions are present.


ASTM A182 Stainless Steel 904L Flanges Properties

Stainless Steel 904L Flanges are made up of a nickel chromium austenitic stainless steel which has 23% nickel and 19% chromium minimum in the composition with carbon, manganese, silicon, phosphorus, sulfur, copper and 4% molybdenum to it. JN Alloy is a leading supplier and manufacturer of the 904L Stainless Steel Flanges in various categories. The nickel chromium molybdenum composition provides the stainless steel 904L with excellent corrosion resistance and strength. It also has good mechanical properties such as 220MPa minimum yield strength and 490MPa minimum tensile strength. The melting point of the material is also high at 1350 degrees Celsius. The Alloy 904L Blind Flange is used at the end of a pipe to close it, mostly permanently. The material is a low carbon version of the 904 grade of steel. This means welding and forming operations are easy on these flanges without risking grain formation and intergranular corrosion due to the carbide precipitation while welding.


JN Alloy is the bearers of a wide range of Stainless Steel 904L products that we have devised through our hands-on experience in the field. We have managed win the trust of several client over the past 25 years with our quality products and excellent services. We offer UNS N08904 Flanges in a wide range of options to different industries. These SS 904L Flanges are well-known for their properties such as resistance to reducing acids such as sulphuric acid. Our 904L SS Flanges are also resistant to chloride ion stress corrosion cracking, oxidation and high heating condition. Due to the resistance that these SS 904L Flanges have on offer, they find usage in petrochemical plants and oil refineries. SS 904L Slip-on Flanges, SS 904L Long Weld Neck flanges, SS 904L Body Flanges, SS 904L Blind Flanges, SS 904L Threaded Flanges, SS 904L Ring type-joint Flanges and more.


Stainless Steel 904L Flanges Specifications

Specification

ASTM A182 Stainless Steel 904L Flanges

Coating

Oil Black Paint, Anti-rust Paint, Zinc Plated, Cold and Hot Dip Galvanized, Yellow Transparent,

Test Certificates

EN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc

Most common types of Flanges

Forged / Threaded / Screwed / Plate

Pressure Rating ANSI

2500 LBS, Class 150 LBS, 900 LBS, 1500 LBS, 300 LBS, 600 LBS

Production technique

· Forged, Heat treated and machined

UNI

6Bar 10Bar 16Bar 25Bar 40Bar

Standards

ASME/ANSI B16.5, API 590, ASME B16.47A/B, ASME B16.36, API7S-15, ISO 70051, EN 1092-1, DIN, B16.48, GOST, API7S-43, API 605, API 6A, BS 10, MSS SP44, BS1560-3.1, BS 4504, BS, EN-1092, EN, DIN, JIS B2220, B16.47 Series A & B, BS 1042

Connect Type/ Flanges Face Type

Flat Face (FF) Flanges, Large Male-Female (LMF) Flanges, Raised Face (RF) Flanges, Large Tongue & Groove, Groove, Lap-Joint Face (LJF) Flanges, Small Male-Female (SMF) Flanges, Small Tongue Flanges, Ring Type Joint (RTJ) Flanges

EN

10Bar 16Bar 6Bar 25Bar 40Bar

JIS

5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K

Size Chart

1/2" to 48"


What are the Application of ASTM A182 904L Stainless Steel Flanges?

Stainless Steel 904L flanges find applications across numerous industries, including:

Chemical Industry: They are used in the production and transportation of aggressive chemicals.

Petrochemical Industry: 904L flanges are vital for offshore and onshore oil and gas operations, where exposure to corrosive environments is common.

Pharmaceutical Industry: They are utilized in pharmaceutical manufacturing, where hygiene and corrosion resistance are critical.

Desalination Plants: Given their resistance to saltwater corrosion, 904L flanges are indispensable in desalination facilities.

Power Plants: They play a role in power generation, especially in high-temperature and high-pressure environments.

Marine Applications: Their resistance to saltwater corrosion makes them suitable for marine installations.

JN Alloy is a distributor and product manufacturer of stainless steel, duplex steel, and nickel.
Tel: +86 19339900211
Add: Stainless steel Market 289, Xinwu District , Wuxi, China
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