ASTM A193 Grade B6 is a standard material specification for chromium-ferritic stainless steel fasteners, for use in high tensile, high temperature and special purpose applications such as pressure piping & pressure vessels bolting. Grade B6 is a heat-treated 12% chromium-ferritic magnetic 410 stainless steel with minimum tensile strength requirement of 110 ksi and yield 85 ksi. ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade B6 Fasteners.
Element |
Ferritic Steel |
---|---|
Chromium Stainless Steel | |
CompositionA, % | |
Carbon | 0.08 - 0.15 |
Manganese | 1.00 |
Phosphorus | 0.040 max |
Sulfur | 0.030 max |
Silicon | 1.00 max |
Chromium | 11.5 - 13.5 |
A: The intentional addition of Bi, Se, Te, and Pb is not permitted.
Diameter, inch. |
Tensile Strength, min, ksi |
Yield Strength, min, 0.2% offset, ksi |
Elongation in 4D, min, % |
Reduction of Area, min, % |
Hardness, max |
---|---|---|---|---|---|
up to 4, inclusive | 110 | 85 | 15 | 50 | Not Defined |
Heat Treatment: Quenched & Tempered at 1100º F minimum.
Nut Specification | Washer Specification |
---|---|
ASTM A194 Grade 6 | SS 410 |