Grade B16
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» Materials » ASTM Specifications » ASTM A193-A193M » Grade B16
ASTM A193 Grade B16 Specification for high tensile bolts, screws, stud bolts, anchor bolts, threaded rods and other externally threaded fasteners, made from chromium-molybdenum-vanadium steel. ASTM A193 Grade B16 is a standard material specification under ASTM A193 for alloy steel fasteners, for use in high tensile, high temperature and special purpose applications.Grade B16 is a heat-treated chromium-molybdenum-vanadium (Cr-Mo-V) alloy steel with maximum tensile strength of 860 MPa, yield 725, and 35HRC hardness. ASTM A193 grade B16 is similar to grade B7 but the addition of vanadium enhances its strength holding capacity at high temperatures. Grade B16 is suitable for applications up-to 450°C (840°F). This specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade B16 Fasteners. Fasteners produced under ASTM A193 Grade B16 standard are mainly used for power generation and allied sectors.
Grade B16 is specified for bolts, studs, stud bolts, threaded rods, screws, bar stock and similar parts, intended for use in bolting applications. Visit our a193gradeb16.com microsite for comprehensive details on B16 Stock & Products.
| Element | Ferritic Steel |
|---|---|
| Chromium-Molybdenum-Vanadium Alloy Steel | |
| CompositionA, % | |
| Carbon | 0.36 - 0.47 |
| Manganese | 0.45 - 0.70 |
| Phosphorus | 0.035 max |
| Sulfur | 0.040 max |
| Silicon | 0.15 - 0.35 |
| Chromium | 0.80 - 1.15 |
| Molybdenum | 0.50 - 0.65 |
| Vanadium | 0.25 - 0.35 |
| AluminiumB | 0.015 max |
AThe 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 | |||||
| 21⁄2 and under | 125 | 105 | 18 | 50 | 321 | 35 |
| over 21⁄2 to 4, inclusive | 110 | 95 | 17 | 45 | 321 | 35 |
| over 4 to 8, inclusive | 100 | 85 | 16 | 45 | 321 | 35 |
Heat Treatment: Quenched & Tempered at 1200º F minimum.
| Nut Specification | Washer Specification |
|---|---|
| ASTM A194 Grade 16 | ASTM F436 |
| Commonly Produced B16 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 |