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    2. ASTM A320/A320M Grade B8C

    ASTM A320/A320M Grade B8C Columbium Stabilized Stainless Steel Bolting

    Class 1 Low Temperature Fasteners - AISI 347 Austenitic Stainless Steel

    ASTM A320/A320M Grade B8C is the standard columbium-stabilized austenitic stainless steel bolting grade offering exceptional versatility across temperature extremes. With 17-19% chromium, 9-13% nickel, and strategic columbium addition, B8C provides unmatched resistance to intergranular corrosion and high temperature creep. Class 1 carbide solution treatment ensures optimal corrosion resistance with 75 ksi tensile strength and 30% elongation. ASTM A320 Grade B8C is extensively specified for chemical processing equipment, refinery applications, and low temperature systems where welding is required and sensitization must be absolutely prevented.

    ASTM A320/A320M Grade B8C Stud Bolts Properties

    ASTM A320/A320M Grade B8C 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 B8C 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 B8C 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 B8C Class 1 All diameters carbide solution treated 75 [515] 30 [205] 30 50 223 HBWDor  96 HRB
    ASTM A320 B8C Class 2 3/4 [20] and under carbide solution treated and strain  hardened 125 [860] 100 [690] 12 35 321 HBW or 35  HRC
    over 3/4 to 1 [20 to 25], incl 115 [795] 80 [550] 15 30 321 HBW or 35  HRC
    over 1 to 11/4 [25 to 32], incl 105 [725] 65 [450] 20 35 321 HBW or 35  HRC
    over 11/4 to 11/2 [32 to 40], inclA 100 [690] 50 [345] 28 45 321 HBW or 35  HRC

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