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    2. ASTM A320/A320M Grade B8PA Class 1A

    ASTM A320/A320M Grade B8PA Class 1A High-Nickel Austenitic Stainless Steel Bolting

    Class 1A Low Temperature Fasteners - AISI 305 Solution Treated Grade

    ASTM A320/A320M Grade B8PA Class 1A is a specialized high-nickel austenitic stainless steel bolting grade offering exceptional formability and low temperature performance. With 17-19% chromium and 10.50-13.00% nickel, B8PA provides superior cold heading characteristics and reduced work hardening compared to standard 304 grades. Class 1A solution treatment ensures maximum corrosion resistance with hardness limited to 192 HBW, making ASTM A320/A320M Grade B8PA Class 1A is ideal for complex fastener geometries, deep drawn components, and cryogenic applications requiring extensive cold forming operations.

    ASTM A320/A320M Grade B8PA Class 1A Stud Bolts Properties

    ASTM A320/A320M Grade B8PA 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 B8PA Class 1A S30500 Range,% 0.12 2.00 0.045 0.030, max 1.00 11- 13.0 17.0- 19.0
    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 B8PA 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 B8PA : 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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