Grade B5
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» Materials » ASTM Specifications » ASTM A193-A193M » Grade B5
ASTM A193 Grade B5 Specification for high tensile bolts, screws, stud bolts, anchor bolts, threaded rods and other externally threaded fasteners, made from 5% chromium-ferritic steel. 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 1100ยบ F minimum.
| Nut Specification | Washer Specification |
|---|---|
| ASTM A194 Grade 3 | ASTM F436 |
| Commonly Produced B5 Fasteners | ||||
|---|---|---|---|---|
| Hex Bolts | Heavy Hex Bolts | Stud Bolts | Threaded Rods | Anchor Bolts |
| Eye Bolts | Socket Head Cap Screws | Countersunk Screws | U Bolts | Square Head Bolts |