ASTM A240 Type 304 Bolt, Nuts, Washers Manufacturer in India

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ASTM A240 Type 304, ASTM A240 Type 304 Bolt, Nuts, ASTM A240 Bolt Manufacturer in India – China Inconel Bolts Inc.

ASTM A240 Type 304 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 304 Chemical Composition

Element	304	316	321	410	904L	S31803	S32750	S31254
Carbon	0.07	0.08	0.08	0.08 – 0.15	0.02	0.03	0.03	0.02
Manganese, max	2.00	2.00	2.00	1.00	2.00	2.00	1.20	1.00
Phosphorus, max	0.045	0.045	0.045	0.040	0.045	0.030	0.035	0.030
Sulfur, max	0.030	0.030	0.030	0.030	0.035	0.020	0.020	0.010
Silicon	0.75	0.75	0.75	1.00	1.00	1.00	0.80	0.80
Chromium	17.50 – 19.50	16.00 – 18.00	17.00 – 19.00	11.50 – 13.50	19.00 – 23.00	21.00 – 23.00	24.00 – 26.00	19.50 – 20.50
Nickel	8.00 – 10.50	10.00 – 14.00	9.00 – 12.00	0.75	23.00 – 28.00	4.50 – 6.50	6.00 – 8.00	17.50 – 18.50
Molybdenum	…	2.00 – 3.00	…	…	4.00 – 5.00	2.50 – 3.50	3.00 – 5.00	6.00 – 6.50
Nitrogen	0.10 max	0.10 max	0.10 max	…	0.10 max	0.08 – 0.20	0.24 – 0.32	0.18 – 0.25
Copper, max	…	…	…	…	1.00 – 2.00	…	0.50	0.50 – 1.00
Titanium	…	…	5 x (C+N) – 0.70	…	…	…	…	…

ASTM A240 Type 304 Mechanical Composition

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Hardness
				Rockwell B (HR B) max	Brinell (HB) max
304	515	205	40	92	201