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ASTM A240 Type 321, ASTM A240 Type 321 Bolt, Nuts, ASTM A240 Bolt Manufacturer in India – Ananka Group

ASTM A240 Type 321 is a high-strength 5 percent chromium ferritic steel used to manufacture bolts, studs, stud bolts, and other fasteners for bolting pressure vessels, valves, flanges, and fittings, particularly in the power generation industry. The ASTM A240 standard includes alloy and stainless steel bolting for pressure vessels, valves, flanges, and fittings used in high temperature or high-pressure applications, as well as other special applications. There are many grades covered, including ferritic steels and austenitic stainless steels with designations such as B5, B6, B7, B8, B8M, and so on.

ASTM A240 Type 321 Chemical Composition

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N	Other
321	min. max	– 0.08	2.00	0.75	0.045	0.030	17.0 19.0	–	9.0 12.0	0.10	Ti=5(C+N) 0.70
321H	min. max	0.04 0.10	2.00	0.75	0.045	0.030	17.0 19.0	–	9.0 12.0	–	Ti=4(C+N) 0.70

ASTM A240 Type 321 Mechanical Composition

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Hardness
Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Rockwell B (HR B) max	Brinell (HB) max
321	515	205	40	95	217
321H	515	205	40	95	217