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Working Pressures for SS 304L / 316L Flanges

Stainless steel 304L and 316L flanges are the low carbon version of stainless steel 304 and 316, respectively. According to ASME B16.5, they may be manufactured from forgings (ASTM A182 Gr. F304L/ F316L) or plates (ASTM A240 Gr. 304L/ 316L), respectively. The working pressures for which SS 304L/316L flanges can be applied at elevated temperatures are listed in below 2 tables (it is also known as “pressure-temperature ratings” for the material).

Pressure-Temperature Ratings for SS 304L/316L Flanges

Temp. °FClass 150Class 300Class 600
-20~1002306001,200
2001955101,020
300175455910
400160420840
500150395785
600140370745
650125365730
700110360720
75095355705
80080345690
85065340675
*The working pressures by classes of 150, 300, 600, unit: psig.

Temp. °FClass 900Class 1500Class 2500
-20~1001,8003,0005,000
2001,5352,5554,260
3001,3702,2803,800
4001,2602,1003,500
5001,1801,9703,280
6001,1151,8603,100
6501,0951,8253,040
7001,0801,8003,000
7501,0601,7652,940
8001,0351,7302,880
8501,0151,6902,820
*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 metric unit. Especially, SS 304L flanges are not to be used over 800°F.

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