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ASTM A194 Grade 7, ASTM A194 Grade 7 Bolt, Nuts, ASTM A194 Bolt Manufacturer in India – Ananka Group

ASTM A194 Grade 7 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 A194 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 A194 Grade 7 Chemical Composition

Element	Ferritic Steel
	Chromium-Molybdenum Alloy Steel
	Composition^A, %
Carbon	0.37 – 0.49
Manganese	0.65 – 1.10
Phosphorus	0.035 max
Sulfur	0.04 max
Silicon	0.15 – 0.35
Chromium	0.75 – 1.20
Molybdenum	0.15 – 0.25

ASTM A194 Grade 7 Hardness

Grade	Completed Nuts			Sample Nut After Heat Treatment
	Brinell Hardness, BHN	Rockwell Hardness		Brinell Hardness, BHN, min	Rockwell Hardness, HRB, min
	Brinell Hardness, BHN	HRC	HRB	Brinell Hardness, BHN, min	Rockwell Hardness, HRB, min
7	248 – 327	24 – 35	…	201	94