ASTM A320 Grade B8C Stud Bolts | UNS S34700 Specifications

ASTM A320 Grade B8C Stud Bolts

347S31, BS2338, 1.4550, 347, S34700, X6CrNiNb18-10

A320 Grade B8C Stud Bolts are manufactured from 347 Stainless Steel in accordance with ASTM A320 specification. Torqbolt is a prominent A320 gr B8C Stud bolt supplier in India.

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ASTM A320 Grade B8C Stud Bolts Properties

ASTM A320 Grade B8C 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 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 Grade B8C Stud Bolts Mechanical Requirements

Austenitic Steels

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 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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