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    2. ASTM A320/A320M Grade B8MA Class 1A

    ASTM A320/A320M Grade B8MA Class 1A Molybdenum-Bearing Stainless Steel Bolting

    Class 1A Low Temperature Fasteners - AISI 316 Solution Treated Grade

    ASTM A320/A320M Grade B8MA Class 1A is the Class 1A solution treated variant of the industry-standard 316 stainless steel bolting grade. Containing 16-18% chromium, 10-14% nickel, and 2-3% molybdenum, B8MA provides superior corrosion resistance in aggressive chemical environments compared to standard 304 grades. With maximum hardness of 192 HBW and 75 ksi tensile strength, ASTM A320/A320M Grade B8MA Class 1A is specifically developed for welded construction in pharmaceutical equipment, food processing machinery, and low temperature chemical processing where intergranular corrosion resistance is paramount.

    ASTM A320/A320M Grade B8MA Class 1A Stud Bolts Properties

    ASTM A320/A320M Grade B8MA Class 1A Stud Bolts Chemical Requirements

    Austenitic Steels

    Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr Mo
    ASTM A320 B8MA Class 1A S31600(316) Range,% 0.08 2.00 0.045 0.030, max 1.00 10.0 - 14.0 16.0 - 18.0 2.00 - 3.00
    Product Variation, % Over or Under 0.01 over 0.04 over 0.010 over 0.005 over 0.05 over 0.15 0.20 0.10

    ASTM A320/A320M Grade B8MA 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 B8MA 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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