ASTM A193 B7 Stud Bolts

ASTM A193 B7 Stud Bolts are critical mechanical fasteners widely recognized as the standard bolting material for flange connections in high-pressure and high-temperature service, commonly up to 450°C (842°F). Unlike hex bolts, a stud bolt is simply a threaded rod designed to be used with two heavy hex nuts (typically ASTM A194 Grade 2H). This design allows for easier tensioning and assembly, especially in tight spaces. The B7 material is a heat-treated chromium-molybdenum (Chromoly) alloy steel, offering excellent high tensile strength and creep resistance essential for maintaining joint integrity under extreme conditions. The main application of B7 Stud Bolts is predominantly in the energy sector, including oil and gas pipelines, refineries, chemical processing plants, and power generation facilities, where reliable, robust, and leak-proof flange joints are non-negotiable. Zeron Fasteners manufactures and supplies a comprehensive range of ASTM A193 B7 Stud Bolts, available in full thread, double-end thread, and various protective coatings.

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ASTM A193 B7 Stud Bolts Manufacturer in India

ASTM A193 B7 Stud Bolts Chemical Composition

Element Composition (%)
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 B7 Stud Bolts Mechanical Properties

Property Value
Tensile Strength (min) 125 ksi (860 MPa)
Yield Strength (0.2% Offset, min) 105 ksi (720 MPa)
Elongation in 4D (min) 16%
Reduction of Area (min) 50%
Hardness (max) 35 HRC (321 HB)

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