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