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: This specification covers forged low alloy and stainless steel piping components for use in pressure systems

Chemical Composition
Identification Symbol	UNS Designation	Composition, %
		Carbon	Manganese	Phosphorus	Sulfur	Silicon	Nickel	Chromium	Molybdenum	Columbium	Titanium	Other Elements
F51	S31803	0.03	2	0.03	0.02	1	4.5-6.5	21.0-23.0	2.5–3.5	…	…	N 0.08–0.20
F53	S32750	0.03	1.2	0.035	0.02	0.8	6.0-8.0	24.0-26.0	3.0-5.0	…	…	N 0.24–0.32 Cu 0.50
F55	S32760	0.03	1	0.03	0.01	1	6.0-8.0	24.0-26.0	3.0–4.0	…	…	N 0.20–0.30 Cu 0.50–1.00 W 0.50–1.00

Mechanical Properties
Identification Symbol	Tensile Strength,	Yield Strength, min,	Elongation in 2 in.	Reduction of Area,	Brinell Hardness Number,
	min, ksi [MPa]	ksi [MPa]	[50 mm] or 4D,min, %	min, %	HBW
F51	90 [620]	65 [450]	25	45	…
F53≤2in. [50 mm]	116 [800]	80 [550]	15	…	310 max
F53>2in. [50 mm]	106 [730]	75 [515]	15	…	310 max
F55	109–130 [750–895]	80 [550]	25	45	…

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 specifications.
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.