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Flange Materials Specification

Carbon Steel Flange
ASTM A105, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2
ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70
Stainless Steel Flange
ASTM A182 F304/304L, F316/316L, F316H, F310, F321, F44 (UNS S31254)
Alloy Steel Flange
ASTM A182 F1, F5a, F9, F11, F12, F22, F91
Chemical Requirements (Composition, %, max)
Material Symbol C Mn P S Si Ni Cr Mo Cu N V Co
ASTM A105 0.35 0.60-1.05 0.035 0.040 0.10-0.35 0.40 0.30 0.12 0.40 _ 0.08 _
ASTM A350 LF2 0.30 0.60-1.35 0.035 0.040 0.15-0.30 0.40 0.30 0.12 0.40 _ 0.08 0.02
ASTM A182 F304 0.08 2.00 0.045 0.030 1.00 8.0-11.0 18.0-20.0 _ _ _ _ _
ASTM A182 F304L 0.03 2.00 0.045 0.030 1.00 8.0-13.0 18.0-20.0 _ _ _ _ _
ASTM A182 F316 0.08 2.00 0.045 0.030 1.00 10.0-14.0 16.0-18.0 2.00-3.00 _ _ _ _
ASTM A182 F316L 0.03 2.00 0.045 0.030 1.00 10.0-15.0 16.0-18.0 2.00-3.00 _ _ _ _
ASTM A182 F321 0.08 2.00 0.045 0.030 1.00 9.0-12.0 17.0-19.0 _ _ _ _ _
EN 10025 S235JR 0.20 1.40 0.045 0.045 _ _ _ _ _ 0.009 _ _
20Mn 0.17-0.23 0.70-1.00 0.035 0.035 0.17-0.37 0.30 0.25   0.25      
20 0.17-0.23 0.60-1.00 0.030 0.020 0.17-0.37 0.25 0.25   0.25      
16Mn 0.13-0.19 1.20-1.60 0.030 0.020 0.20-0.60 0.30 0.30   0.25      
Mechanical Requirements
Material Symbol Tensile Strength, min, MPa Yield point, min, Mpa Elongation, min, % Reduction of area, min, % Hardness, max, HB Min. Impact
Average, J
Test Temperature, °C
ASTM A105 485 250 22 30 187    
ASTM A350 LF2 485-655 250 22 30   20 -46
ASTM A182 F304 515 205 30 50      
ASTM A182 F304L 485 170 30 50      
ASTM A182 F316 515 205 30 50      
ASTM A182 F316L 485 170 30 50      
ASTM A182 F321 515 205 30 50      
20Mn 450 275 24 50 197    
20 410 245 25 55 156    
A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system.
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