ASTM A182/A182M: American Society for Testing and Materials
Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service.
Scope: "forged low alloy and stainless
steel piping components for use in pressure systems. "

Chemical Composition
Identification Symbol	UNS Designation	Grade	Composition, %
			Carbon	Manganese	Phosphorus	Sulfur	Silicon	Nickel	Chromium	Molybdenum	Columbium	Titanium	Other Elements
F304	S30400	18 chromium,8 nickel           304	0.08	2	0.045	0.03	1	8.0-11.0	18.0-20.0				N 0.10†
F304H	S30403	18 chromium, 8 nickel 304H	0.04-0.10	2	0.045	0.03	1	8.0-11.0	18.0-20.0
F304L	S30409	18 chromium, 8 nickel, low carbon 304L	0.03	2	0.045	0.03	1	8.0-13.0	18.0-20.0				N 0.10†–0.16
F 316	S31600	18 chromium, 8 nickel, modified with molybdenum 316	0.08	2	0.045	0.03	1	10.0-14.0	16.0-18.0	2.00-3.00			N 0.10
F 316L	S31603	18 chromium, 8 nickel, modified with molybdenum, low carbon 316L	0.03	2	0.045	0.03	1	10.0-15.0	16.0-18.0	2.00-3.00
F321	S32100	18 chromium, 8 nickel modified with titanium 321	0.08	2	0.045	0.03	1	9.0-12.0	17.0-19.0			J
F321H	S32109	18 chromium, 8 nickel, modified with titanium 321H	0.04–0.10	2	0.045	0.03	1	9.0-12.0	17.0-19.0			K
F347H	S34709	18 chromium, 8 nickel, modified with columbium 347H	0.04–0.10	2	0.045	0.03	1	9.0-13.0	17.0-20.0		M

Mechanical Properties
IdentificationSymbol	TensileStrength, min,ksi[MPa]	YieldStrength,min, ksi[MPa]	Elongationin2in. [50mm]or4D,min,%	Reduction of Area, min, %	Brinell Hardness Number, HBW
F304	75 [515]	30[205]	30	50
F304H	75 [515]	30[205]	30	50
F304L	70 [485]	25 [170]	30	50
F316	75 [515]	30 [205]	30	50
F316L	70[485]	25[170]	30	50
F321	75[515]	30[205]	30	50
F321H	75[515]	30[205]	30	50
F347H	75[515]	30[205]	30	50

1.1 This specification covers forged low alloy and stainless steel piping components for use in pressure systems. Included are flanges, fittings, valves, and similar parts to specified dimensions or to dimensional standards, such as the ASME specifications that are referenced in Section 2.
1.2 For bars and products machined directly from bar (other than those directly addressed by this specification; see 6.4), refer to Specifications A479/A479M and A739 for the similar grades available in those specifications. Products made to this specification are limited to a maximum weight of 10 000 lb [4540 kg]. For larger products and products for other applications, refer to Specifications A336/A336M and A965/ A965M for the similar ferritic and austenitic grades, respectively, available in those speciÞcations.
1.3 Several grades of low alloy steels and ferritic, martensitic, austenitic, and ferritic-austenitic stainless steels are included in this specification. Selection will depend upon design and service requirements. Several of the ferritic/ austenitic (duplex) grades are also found in Specification A1049/A1049M.