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    2. ASTM A320/A320M Grade B8T

    ASTM A320 / ASME SA-320 Grade B8T Stud Bolts (UNS S32100)

    AISI 321 titanium-stabilized austenitic stainless steel · Solution-treated (Class 1) or strain-hardened (Class 2)

    ASTM A320 Grade B8T is an austenitic stainless steel bolting grade specified per ASTM A320/A320M-22 for low-temperature service. Assigned UNS number S32100. Manufactured from AISI 321 titanium-stabilized austenitic stainless steel. The grade is supplied in Class 1 (solution-treated) or Class 2 (strain-hardened) condition, with Class 2 offering higher tensile strength through controlled cold work. Grade B8T resists sensitization through titanium stabilization, suited for elevated-temperature service. Grade B8T is intended for stud bolts and hex bolts in pressure vessels, valves, flanges, and fittings exposed to corrosive or low-temperature environments. Grade B8T is equivalent to ASME SA-320 Grade B8T in the ASME Boiler and Pressure Vessel Code Section II Part A.

    ASTM A320 Grade B8T properties

    ASTM A320 Grade B8T chemical composition

    Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr Ti N
    ASTM A320 B8T 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 Grade B8T mechanical properties

    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 B8T Class 1 All diameters carbide solution treated 75 [515] 30 [205] 30 50 223 HBWDor  96 HRB
    ASTM A320 B8T 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

    What nuts and washers are specified for ASTM A320 Grade B8T?

    For low-temperature service consistency, ASTM A320 Grade B8T stud bolts are paired with ASTM A194 Grade 8 series stainless heavy hex nuts and ASTM F436 hardened steel washers. TorqBolt supplies kit-matched A320 B8T + A194 + F436 sets with a single EN 10204 3.1 or 3.2 certificate covering all three components.

    NORSOK M-650 qualification & EN 10204 3.1 / 3.2 certificates for A320 Grade B8T

    TorqBolt’s ASTM A320 Grade B8T stud bolt production route is qualified to NORSOK M-650 for North Sea oil & gas offshore service. Each manufacturing record links heat number, melt analysis, heat-treatment batch, mechanical test, dimensional inspection, surface treatment, and dispatch. Standard certification is EN 10204 Type 3.1 (manufacturer’s test report); Type 3.2 third-party witnessed by Lloyd’s Register, DNV, BV, ABS, or TUV is available on request. The qualification packet covers ASME SA-320 B8T equivalence, NACE MR0175 / ISO 15156-2 sour-service compliance (where applicable), and PED 2014/68/EC for European pressure-equipment buyers.

    Related ASTM A320 grades & companion specifications

    ASTM A320 Grade B8T: related product searches

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