ASTM A193 Grade B16 Specification

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.

Chemical Composition

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.

Mechanical Properties

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.

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