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    2. ASTM A320/A320M Grade B8TA Class 1A

    ASTM A320/A320M Grade B8TA Class 1A Titanium Stabilized Stainless Steel Bolting

    Class 1A Low Temperature Fasteners - AISI 321 Solution Treated

    ASTM A320/A320M Grade B8TA Class 1A represents the Class 1A carbide solution treated variant of 321 stainless steel, featuring titanium stabilization for exceptional intergranular corrosion resistance. With maximum hardness of 192 HBW (90 HRB) and 75 ksi tensile strength, B8TA provides superior weldability and formability compared to strain-hardened classes. The titanium content of 5x(C+N) minimum prevents chromium carbide precipitation during welding, making ASTM A320/A320M Grade B8TA Class 1A suited to fabricated pressure vessels, welded piping systems, and low temperature applications.

    ASTM A320/A320M Grade B8TA Class 1A Properties

    ASTM A320/A320M Grade B8TA Class 1A Chemical Requirements

    Austenitic Steels

    Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr Ti N
    ASTM A320 B8TA Class 1A S32100(321) Range,% 0.08 2.00 0.045 0.030, max 1.00 9.0- 12.0 17.0- 19.0 5 × (C+N) min -0.7 max 010, 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 1

    ASTM A320/A320M Grade B8TA Class 1A 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 B8TA Class 1A All diameters carbide solution treated in the  finished condition 75 [515] 30 [205] 30 50 192 HBW or 90  HRB

    Related ASTM A320 pages

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