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ASTM A193 Grade B16

The specification of ASTM A193 grade B16 includes details of high tensile, stainless, or alloy steel fasteners. It is extensively used in high-pressure and high-temperature services like valves, fittings, pressure valves, flanges, and chemical and petroleum construction applications.

The grades that are present under A193 are below.

A193 Grades

B16 Alloy steel, AISI 4340 quenched and tempered

Mechanical properties

Grade Size Tensile ksi, min Yield ksi, min Elong %, min RA % min HBW Rockwell
B16 Up to 2-1/2 125 105 18 50 321 Max 35 HRC max
Over 2-1/2 to 4 110 95 17 45
Over 4 to 8 100 85 16 45

Chemical properties

Element B16
Carbon 0.36 - 0.47%
Manganese 0.45 - 0.70&
Phosphorus, max 0.035%
Sulfur, max 0.040%
Silicon 0.15 - 0.35%
Chromium 0.80 - 1.15
Vanadium 0.25 - 0.35%
Molybdenum 0.50 - 0.65

Compatible hardware

Bolt Grade Nut Washers
B16 A194 Grade 4 F436