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    2. ASTM A320/A320M Grade B8F

    ASTM A320/A320M Grade B8F Machining Stainless Steel Bolting

    Class 1 Low Temperature Fasteners - AISI 303 Austenitic Machining Grade

    ASTM A320/A320M Grade B8F is the standard machining austenitic stainless steel bolting grade specifically engineered for high-speed manufacturing operations. Containing controlled sulfur or selenium additions, B8F offers machinability ratings significantly superior to standard 304 grades while maintaining adequate mechanical properties for low temperature service. With Class 1 carbide solution treatment and 75 ksi tensile strength, ASTM A320 Grade B8F is extensively used for threaded components requiring extensive machining, automatic screw machine products, and applications where production efficiency outweighs maximum corrosion resistance requirements.

    ASTM A320/A320M Grade B8F Stud Bolts Properties

    ASTM A320/A320M Grade B8F Stud Bolts Chemical Requirements

    Austenitic Steels

    Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr Se
    ASTM A320 B8F S30300(303) Range,% 0.15 2.00 0.20 00.15, min 1.00 8.0 - 10.0 17.0- 19.0 0.15-0.35
    Product Variation, % Over or Under 0.01 over 0.04 over 0.010 over 0.20 0.05 over 0.10 0.20 ...

    ASTM A320/A320M Grade B8F 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 B8F : Class 1 All diameters carbide solution treated 75 [515] 30 [205] 30 50 223 HBWDor 96 HRB
    ASTM A320 B8F : 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

    Related Keywords

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