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Chemical Composition For Stud Bolts

 
 
Grade of alloy steel for Stud-Bolts to BS 1750 , ASTM A 193 and A 320
1 SYMBOL B7 B7M B16 B8 B8M B8T L7 / L7M L43
2 Type Ferritic Ferritic Austenitic Austenitic
Unstabilized
Asutenitic Austenitic Stabilized Ferritic Ferritic
3 Service conditions High Temp. High Temp. High Temp. High Low. Temp. High Low. Temp. High Low. Temp. Low Temp. Low Temp.
4 Material specification
ASTM
A193 A193 A193 A193 A193 A193 A320 A320
Grade B7 Grade B7M Gr. B16 Grade B8 Grade B8M Grade B8T Grade L7 GradeL43
5 Chemical composition % % % % % % % %
  C. 0.37---0.49 0.37---0.49 0.36---0.47 0.08 max. 0.08 max. 0.08 max. 0.38---0.48 0.38---0.43
  Mn. 0.65---1.10 0.65---1.10 0.45---0.70 2.00 max. 2.00 max. 2.00 max. 0.75---1.00 0.60---0.85
  Si. 0.15---0.35 0.15---0.35 0.15---0.35 1.00 max. 1.00 max. 1.00 max. 0.15---0.35 0.15---0.35
  P. 0.035 max. 0.035 max. 0.035 max. 0.045 max. 0.045 max. 0.045 max. 0.035 max. 0.040 max.
  S. 0.04 max. 0.04 max. 0.04 max. 0.030 max. 0.030 max. 0.030 max. 0.040 max. 0.040 max.
  Cr. 0.75---1.20 0.75---120 0.80---1.15 18.00---20.00 16.00---18.00 17.00---9.00 0.80---1.10 0.70---0.90
  Ni. --- --- --- --- --- --- 8.00---10.50 10.00---14.00 9.00---12.00 --- --- 1.65---2.00
  Mo. 0.15---0.25 0.15---0.25 0.50---0.65 --- --- 2.00---3.00 --- --- 0.15-0.25 0.20---0.30
  V. --- --- --- --- 0.25---0.35 --- --- --- --- --- --- --- --- --- ---
  Ti. --- --- --- --- --- --- --- --- --- --- 5xCMIN --- --- --- ---
6 Brinell Hardness Not applicable max. 20 RC Not applicable 223 B.H.N. max. 223 B.H.N. max. 223 B.H.N. max. Not applicable Not applicable
7 Impact Value Not applicable Not applicable Not applicable Not applicable Not applicable Not applicable 20 ft. lbf.
at 1500 F
20 ft. lbf.
1500F min
8 Physicalas per ASTM A 193 & B.S. 1506-621 & B.S. 4882.          
  U.T.S. 88kg/MM2min 70.3 min. 88kg/MM2min 52.75/MM2min 52.75kg/MM2 52.75kg/MM2 88kg/MM2 88kg/MM2
  Elongation 16% min 18% min 18% min 30% min 30% min 30% min 16% min 16% min
  Yield 70.39kg/MM2 56.26 min. 73.8kg/MM2 21.1kg/MM2min 21.1kg/MM2 21.1kg/MM2 73.8kg/MM2 73.8kg/MM2
  Reduction area 50% min 50% min 50% min 50% min 50% min 50% min 50% min 50% min
9 Heat treatment Oil quenched & tempered Oil quenched & tempered Oil quenched & tempered Carbide solution treated Carbide solution treated Carbide solution treated Oil quenched & tempered Oil quenched & tempered
10 Tempering temperature 11000F min 5930C 11500F min 6200C 12000F min 6500C --- --- --- --- --- --- 11000F min 5930C min 11000F min 5930C min
 
 
   
   
 
 
 
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