ASTM A193 Grade B7 Stud Bolts

The ASTM A193 Grade B7 Stud Bolt is the definitive high-strength, high-temperature fastener used in flanged joints across the petrochemical, power generation, and oil & gas industries. Manufactured from an Alloy Steel (Chromium-Molybdenum steel) and quenched and tempered, B7 material offers superior tensile and creep rupture strength for service temperatures up to 450°C (842°F). These fasteners are typically continuous threaded rods supplied with two ASTM A194 Grade 2H Heavy Hex Nuts. The precise threading and material strength are essential for inducing the high pre-load required to maintain a leak-proof seal in critical pressure piping applications. Zeron Fasteners manufactures and supplies B7 Stud Bolts to ASME B16.5 and ASME B16.47 flange dimensions, often with protective coatings like PTFE.

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ASTM A193 Grade B7 Stud Bolts Manufacturer in India

ASTM A193 Grade B7 Stud Bolts Chemical Composition

Element Composition (Mass %)
Carbon (C) 0.37 – 0.49
Manganese (Mn) 0.65 – 1.10
Phosphorus (P) 0.035 max
Sulfur (S) 0.040 max
Silicon (Si) 0.15 – 0.35
Chromium (Cr) 0.75 – 1.20
Molybdenum (Mo) 0.15 – 0.25

ASTM A193 Grade B7 Stud Bolts Mechanical Properties

Property Value
Size Range Up to 4 inches
Tensile Strength, minimum 125 ksi min
Yield Strength, minimum 105 ksi min
Elongation After Fracture, minimum 16% min
Reduction of Area, minimum 50% min
Hardness (Brinell) 248 – 321 HBW

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