ASTM A193 Grade B7 Bolts, Stud Bolts, Fasteners

Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications

ASTM A193 specification covers alloy and stainless steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications. Several grades are covered, including ferritic steels and austenitic stainless steels designated B5, B6, B7, B8, B8M, etc. Selection will depend upon design, service conditions, mechanical properties, and high temperature characteristics. This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable A193M specification designation (SI units), the inch-pound units shall apply

ASTM A193 Grade B7 Raw Material

Grade Raw Material Description
B7 Chromium Molybdenum Alloy Steel, Quenched & Tempered

ASTM A193 Grade B7 Properties

ASTM A193 Grade B7 Chemical Composition

Carbon Manganese, max Phosphorus, max Sulfur, max Silicon Chromium Molybdenum
0.08-0.15 1.00 0.040 0.030 1.00 max 11.5 - 13.5 0.15-0.25

ASTM A193 Grade B7 Mechanical Properties

Grade Diameter Tensile Strength Yield Strength Elongation Reduction Hardness
Grade B7 M64 and under 860 720 16 50 321 HBW or 35 HRC
Grade B7 Over M64 to M100 795 655 16 50 321 HBW or 35 HRC
Grade B7 Over M100 to M180 690 515 18 50 321 HBW or 35 HRC

Heat Treatment

Quenched & Tempered at 593ยบ C minimum.

ASTM A193 Grade B7 Bolt Marking

Manufacturer's Mark Grade Marking

Recommended Nuts & Washers

Bolting Grade Nut Grade Washer Grade
ASTM A193 Grade B7 ASTM A194 Grade 2H, 2HM ASTM F436

ASTM A193 Grade B7 Bolting

Hex Bolt Heavy Hex Bolts Stud Bolts Threaded Rods Anchor Bolts
Eye Bolts Socket Head Cap Screws Countersunk Screws J Bolts Square Head Bolts