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ASTM A182 F904L Flange

ASTM A182 F904L Flange is a non-stabilized austenitic stainless steel with low carbon content. This high alloy stainless steel is added with copper to improve its resistance to strong reducing acids, such as sulphuric acid. The steel is also resistant to stress corrosion cracking and crevice corrosion.

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ASTM A182 F904L Flange is a standard specification developed by the American Society for Testing and Materials (ASTM) for high-temperature forged or rolled alloy steel and stainless steel pipe flanges, forged pipe fittings, valves and components. This standard has strict regulations on the chemical composition, mechanical properties, manufacturing process, inspection methods and other aspects of the material to ensure that these components can operate safely and reliably under harsh environments such as high temperature and high pressure.
F904L material is a super austenitic stainless steel. On the basis of ordinary austenitic stainless steel, it adjusts the content of alloy elements to make it have better corrosion resistance, especially in resisting corrosion in chloride ion media, and is suitable for various strong corrosive environments.

ASTM A182 F904 Flange Material

ASTM A182 F904L Chemical Composition

CHEMICAL LIMITS C Mn P S Si Ni Cr Mo N Ti Cu
ASTM A182 F904L  (N08904) MIN           23.00 19.00 4.00     1
MAX 0.02 2.00 0.040 0.030 1.00 28.00 23.00 5.00 0.10   2.00

ASTM A182 F316 Mechanical Property

MATERIAL T.S (MPA) Y.S (MPA) EL % R/A %
ASTM A182 F904L 490 min 215 min 35 min 50 min

Dimensions of Class  150 ASTM A182 F904L Flanges 

Nominal Pipe
Size, NPS
Outside
Diameter
of
Flange,
O
Minimum
Thickness
of Flange,
tf
[Notes (2)-(4)]
Minimum
Thickness
Lap Joint,
tf
Diameter
of Hub, X
Hub
Diameter
Beginning
of
Chamfer
Welding
Neck,
Ah
[Note (5)]
Length Through Hub Minimum
Thread
Length
Threaded,
T
[Note (6)]
Bore Welding
Neck/
Socket
Welding,
B
[Note (7)]
Corner
Bore
Radius
of
Lapped
Flange
and
Pipe,
r
Depth of
Socket,
D
Threaded/
Slip-on/
Socket
Welding,              Y
Lapped,
Y
Welding
Neck,
Y
Minimum Slip-on/
Socket
Welding,                 B
Minimum
Lapped,
B
 1/2 90 9.6 11.2 30 21.3 14 16 46 16 22.2 22.9 15.8 3 10
 3/4 100 11.2 12.7 38 26.7 14 16 51 16 27.7 28.2 20.9 3 11
1 110 12.7 14.3 49 33.4 16 17 54 17 34.5 34.9 26.6 3 13
1 1/4 115 14.3 15.9 59 42.2 19 21 56 21 43.2 43.7 35.1 5 14
1 1/2 125 15.9 17.5 65 48.3 21 22 60 22 49.5 50.0 40.9 6 16
2 150 17.5 19.1 78 60.3 24 25 62 25 61.9 62.5 52.5 8 17
2 1/2 180 20.7 22.3 90 73.0 27 29 68 29 74.6 75.4 62.7 8 19
3 190 22.3 23.9 108 88.9 29 30 68 30 90.7 91.4 77.9 10 21
3 1/2 215 22.3 23.9 122 101.6 30 32 70 32 103.4 104.1 90.1 10  
4 230 22.3 23.9 135 114.3 32 33 75 33 116.1 116.8 102.3 11  
5 255 22.3 23.9 164 141.3 35 36 87 36 143.8 144.4 128.2 11  
6 280 23.9 25.4 192 168.3 38 40 87 40 170.7 171.4 154.1 13  
8 345 27.0 28.6 246 219.1 43 44 100 44 221.5 222.2 202.7 13  
10 405 28.6 30.2 305 273.0 48 49 100 49 276.2 277.4 254.6 13  
12 485 30.2 31.8 365 323.8 54 56 113 56 327.0 328.2 304.8 13  
14 535 33.4 35.0 400 355.6 56 57 125 57 359.2 360.2 Note(8) 13  
16 595 35.0 36.6 457 406.4 62 64 125 64 410.5 411.2 Note(8) 13  
18 635 38.1 39.7 505 457.0 67 68 138 68 461.8 462.3 Note(8) 13  
20 700 41.3 42.9 559 508.0 71 73 143 73 513.1 514.4 Note(8) 13  
24 815 46.1 47.7 663 610.0 81 83 151 83 616.0 616.0 Note(8) 13

Application Fields

Chemical Industry: In chemical production, many media are highly corrosive, such as sulfuric acid, hydrochloric acid, sodium hydroxide, etc. F904L flanges are widely used in the connection parts of chemical pipeline systems, reactors, storage tanks and other equipment due to their excellent corrosion resistance, ensuring the safety and stability of chemical production.

Marine Engineering: There are a large number of chloride ions in the marine environment, which are highly corrosive to metal materials. F904L flanges can resist the corrosion of seawater and are suitable for marine engineering facilities such as offshore platforms, submarine pipelines, and seawater desalination equipment to ensure the long-term operation of marine engineering.

Food and Pharmaceutical Industry: In the process of food and pharmaceutical production, the hygiene requirements for pipelines and equipment are very high, and it is also necessary to prevent materials from contaminating products. F904L stainless steel has good hygiene and corrosion resistance, meets the strict requirements of the food and pharmaceutical industries, and can be used for related pipeline connections and equipment manufacturing.

 

 

 

 

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