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    2. ASTM A320/A320M Grade B8A Class 1A

    ASTM A320/A320M Grade B8A Class 1A Low-Carbon Stainless Steel Bolting

    Class 1A Low Temperature Fasteners - AISI 304 Solution Treated Grade

    ASTM A320/A320M Grade B8A Class 1A represents the Class 1A solution treated variant of the world's most widely used austenitic stainless steel bolting material. With maximum hardness of 192 HBW (90 HRB) compared to 223 HBW for Class 1, B8A provides enhanced formability and reduced work hardening for demanding fabrication processes. The lower hardness maximum ensures superior cold forming characteristics while maintaining 75 ksi tensile strength, making ASTM A320/A320M Grade B8A Class 1A is ideal for complex fastener heads, deep thread rolling, and low temperature applications requiring maximum ductility and ease of manufacture.

    ASTM A320/A320M Grade B8A Class 1A Stud Bolts Properties

    ASTM A320/A320M Grade B8A Class 1A Stud Bolts Chemical Requirements

    Austenitic Steels

    Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr
    ASTM A320 B8A Class 1A S30400(304) Range,% 0.08 2.00 0.045
    0.030    		 1.00 8.0-11.0 18.0 - 20.0
    Product Variation, % Over or Under 0.01 over 0.04 over 0.010 over 0.005 over 0.05 over 0.15 0.20

    ASTM A320/A320M Grade B8A 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 B8A: 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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