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Working Pressures of SS 304 Flanges

Stainless steel 304 flanges (18Cr-8Ni) may be manufactured from forgings, castings, or plates, respectively. It includes ASTM A182 Gr. F304 forgings, ASTM A351 Gr. CF8 castings, and ASTM A240 Gr. 304 plates. The flange dimensions are generally in accordance with ASME B16.5. It can be classified into 7 classes: 150, 300, 400, 600, 900, 1500, and 2500. The working pressures for which SS 304 flanges can be applied at elevated temperatures are listed in below tables (it is also known as “pressure-temperature ratings” for the material).

Pressure-Temperature Ratings for SS 304 Flanges

Temp. °FClass 150Class 300Class 600
-20~1002757201,440
2002306001,200
3002055401,075
400190495995
500170465930
600140440885
650125430865
700110420845
75095415825
80080405810
85065395790
90050390780
95035380765
100020355710
1050-325650
1100-255515
1150-205410
1200-165330
1250-135265
1300-115225
1350-95185
1400-75150
1450-60115
1500-4085
*The working pressures by classes of 150, 300, 600, unit: psig.

Temp. °FClass 900Class 1500Class 2500
-20~1002,1603,6006,000
2001,8003,0005,000
3001,6152,6904,480
4001,4902,4854,140
5001,3952,3303,880
6001,3252,2103,680
6501,2952,1603,600
7001,2652,1103,520
7501,2402,0653,440
8001,2152,0303,380
8501,1901,9803,300
9001,1651,9453,240
9501,1451,9103,180
10001,0651,7702,950
10509751,6302,715
11007701,2852,145
11506151,0301,715
12004958251,370
12504006701,115
1300340565945
1350280465770
1400225380630
1450175290485
1500125205345
*The working pressures by classes of 900, 1500, 2500, unit: psig.

Since pipe flanges of Class 400 are rarely used in engineering practice, its data are not listed. All values in the above two tables are in US customary unit. You may contact us to get the technical specification in ISO metric unit. Pipe flanges made of A351 Gr. CF3 are not to be used over 800°F. At temperatures over 1000°F, SS 304 flanges made from forgings and plates shall be used only when the carbon content is 0.04% or higher. The listed data are also applicable for A182 Gr. F304H, A351 Gr. CF3, A240 Gr. 304H.

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