Table of Contents

ASTM A193 Grade B7, ASTM A193 Grade B7 Bolt, Nuts, ASTM A193 Bolt Manufacturer in India – Ananka Group

ASTM A193 Grade B7 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 A193 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 A193 Grade B7 Chemical Composition

Element	Alloy Steel
	Chromium Molybdenum Steel^A
	composition, %
Carbon	0.37 – 0.49^C
Manganese	0.65 – 1.10
Phosphorus	0.035 max
Sulfur	0.040 max
Silicon	0.15 – 0.35
Chromium	0.75 – 1.20
Molybdenum	0.15 – 0.25

ASTM A193 Grade B7 Mechanical Composition

Diameter, inch.	Tensile Strength, min, ksi	Yield Strength, min, 0.2% offset, KSI	Elongation in 4D, min, %	Reduction of Area, min, %	Hardness, max
					Hardness, max	2-1⁄2 and under	125	105	16	50	321 HBW or 35 HRC
					over 2-1⁄2 to 4, inclusive	115	95	16	50	321 HBW or 35 HRC
over 4 to 7, inclusive	100	75	18	50	321 HBW or 35 HRC