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    2. ASTM A320/A320M Grade B8M

    ASTM A320/A320M Grade B8M Standard Molybdenum Stainless Steel Bolting

    Class 1 Low Temperature Fasteners - AISI 316 Austenitic Stainless Steel

    ASTM A320/A320M Grade B8M stands as the most widely specified molybdenum-bearing austenitic stainless steel bolting grade for low temperature service. With 2-3% molybdenum addition to the basic 18-8 chromium-nickel composition, B8M delivers exceptional resistance to pitting and crevice corrosion in chloride environments. Class 1 carbide solution treatment ensures optimal corrosion resistance with 75 ksi tensile strength and 30% elongation, making ASTM A320/A320M Grade B8M indispensable for chemical processing, pulp and paper, marine hardware, and cryogenic applications requiring both toughness and corrosion protection.

    ASTM A320/A320M Grade B8M Stud Bolts Properties

    ASTM A320/A320M Grade B8M 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 B8M 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 B8M 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 B8M Class 1 All diameters carbide solution treated 75 [515] 30 [205] 30 50 223 HBWDor  96 HRB
    ASTM A320 B8M Class 2 3/4 [20] and under carbide solution treated and strain  hardened 110 [760] 95 [655] 15 45 321 HBW or 35  HRC
    over 3/4 to 1 [20 to 25], incl 100 [690] 80 [550] 20 45 321 HBW or 35  HRC
    over 1 to 11/4 [25 to 32], incl 95 [655] 65 [450] 25 45 321 HBW or 35  HRC
    over 11/4 to 11/2 [32 to 40], inclA 90 [620] 50 [345] 30 45 321 HBW or 35  HRC

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