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    2. ASTM A320/A320M Grade B8CA Class 1A

    ASTM A320/A320M Grade B8CA Class 1A Columbium Stabilized Stainless Steel Bolting

    Class 1A Low Temperature Fasteners - AISI 347 Solution Treated Grade

    ASTM A320/A320M Grade B8CA Class 1A is a columbium (niobium) stabilized austenitic stainless steel bolting grade designed for superior performance in welded and high temperature applications. The columbium addition of 10xC minimum prevents chromium carbide precipitation, providing exceptional resistance to intergranular corrosion in the as-welded condition. Class 1A solution treatment limits hardness to 192 HBW while maintaining 75 ksi tensile strength, making B8CA the preferred choice for pressure vessels operating in the 800-1500°F range, exhaust systems, and low temperature applications requiring post-weld solution treatment without sensitization concerns.

    ASTM A320/A320M Grade B8CA Class 1A Stud Bolts Properties

    ASTM A320/A320M Grade B8CA Class 1A Stud Bolts Chemical Requirements

    Austenitic Steels

    Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr Nb E + Ta
    ASTM A320 B8CA Class 1A S34700(347) Range,% 0.08 2.00 0.045
    0.030    		 1.00 9.0- 12.0 17.0- 19.0 10 × C content, min -1.10 max
    Product Variation, % Over or Under 0.01 over 0.04 over 0.010 over 0.005 over 0.05 over 0.15 0.20 0.05 under

    ASTM A320/A320M Grade B8CA Class 1A Stud Bolts Mechanical Requirements

    Austenitic Steels

    Grade and Class Diameter, in. [mm] Heat Treatment Tensile Strength, min, ksi [MPa] Yield Strength, min, ksi [MPa] (0.2 % offset) Elongation in 2 in. or 50 mm, min, % Reduction of Area, min, % Hardness, max
    ASTM A320 B8CA Class 1A All diameters carbide solution treated in the  finished condition 75 [515] 30 [205] 30 50 192 HBW or 90  HRB

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