ASTM A320 Grade B8 Stud Bolts Properties

ASTM A320 Grade B8 Stud Bolts Chemical Requirements

Austenitic Steels

Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr Mo Se Ti N Nb E + Ta
ASTM A320 B8 S30400(304) Range,% 0.08 2.00 0.045 0.030 1.00 8.0-11.0 18.0 - 20.0 ... ... ... ... ...

ASTM A320 Grade B8 Stud Bolts Mechanical Requirements

Grade and Class Diameter, in. [mm] Heat Treatment Minimum Tempering Temperature, °F [°C] 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 B8 Class 1 All diameters carbide solution treated ... 75 [515] 30 [205] 30 50 223 HBWDor  96 HRB
ASTM A320 B8 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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