ASTM A193 Grade B5 is a standard material specification for low alloy chromium-ferritic steel fasteners, for use in high tensile, high temperature and special purpose applications such as pressure piping & pressure vessels bolting. Grade B5 is a heat-treated 5% chromium-ferritic magnetic stainless steel with minimum tensile strength requirement of 100 ksi and yield 80 ksi. ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade B5 Fasteners.
Element |
Ferritic Steel |
---|---|
Chromium-Molybdenum Steel | |
CompositionA, % | |
Carbon | 0.10 min |
Manganese | 1.00 |
Phosphorus | 0.040 max |
Sulfur | 0.030 max |
Silicon | 1.00 max |
Chromium | 1.00 - 6.00 |
Molybdenum | 0.40 - 0.65 |
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 |
|
---|---|---|---|---|---|---|
HBW | HRC | |||||
up to 4, inclusive | 100 | 80 | 16 | 50 | 321 | 35 |
Heat Treatment: Quenched & Tempered at 1100º F minimum.
Nut Specification | Washer Specification |
---|---|
ASTM A194 Grade 3 | ASTM F436 |