SA193 Grade B7 Stud

Product Description

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SA193 Grade B7 studs are premium chromium-molybdenum alloy steel fasteners designed for high-temperature, high-pressure industrial applications. These heat-treated stud bolts deliver exceptional tensile strength of 125 ksi (860 MPa) and yield strength of 105 ksi (720 MPa) for diameters up to 2.5 inches.

Key Benefits

SA193 Grade B7 studs offer superior mechanical properties through specialized quenching and tempering heat treatment processes. The chromium-molybdenum alloy composition provides enhanced strength-to-weight ratio, making these fasteners ideal for critical structural applications. These studs maintain dimensional stability and resist deformation under extreme loading conditions, ensuring reliable performance in demanding environments.

The maximum operating temperature reaches 450C (840F), allowing use in high-temperature industrial processes. Grade B7 studs demonstrate excellent fatigue resistance and impact toughness, crucial for applications experiencing dynamic loading and thermal cycling.

Typical Applications

Oil and Gas Industry: SA193 B7 studs secure pipeline flanges, pressure vessels, and wellhead equipment in petroleum extraction and refining operations. These fasteners withstand corrosive hydrocarbon environments and high-pressure conditions typical in petrochemical processing.

Power Generation: Power plants utilize B7 studs in steam turbines, boilers, heat exchangers, and steam pipelines where high-temperature strength is essential. The studs maintain structural integrity under thermal stress and pressure fluctuations.

Chemical Processing: Chemical reactors, distillation columns, and process piping systems rely on SA193 B7 studs for secure connections in aggressive chemical environments. The alloy composition provides adequate corrosion resistance for many chemical applications.

Pressure Vessels: ASME Boiler and Pressure Vessel Code applications frequently specify B7 studs for flanged connections, manhole covers, and equipment assembly. These fasteners ensure leak-tight seals under internal pressure and external loads.

Usage Guidelines

SA193 Grade B7 studs typically pair with ASTM A194 Grade 2H heavy hex nuts for optimal performance. Proper installation requires controlled tightening torque values based on stud diameter and surface finish. The studs accept various surface treatments including black oxide, zinc plating, PTFE coating, and hot-dip galvanizing for enhanced corrosion protection.

Thread configurations include UNC (Unified Coarse), UNF (Unified Fine), and metric ISO threads to accommodate different application requirements. Full-thread, double-end, and tap-end configurations provide installation flexibility.

Technical Specifications

Chemical Composition: Carbon 0.38-0.48%, Manganese 0.75-1.00%, Chromium 0.80-1.10%, Molybdenum 0.15-0.25%, Silicon 0.15-0.35%, Phosphorus max 0.035%, Sulfur max 0.040%.

Mechanical Properties: Minimum elongation 16%, reduction of area 50%, maximum hardness 35 HRC (321 HBW). Impact toughness measured by Charpy V-Notch testing ensures resistance to brittle fracture.

Heat Treatment: Minimum tempering temperature 1100F (593C) develops optimal strength and toughness characteristics.

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