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  STUD BOLTS :::

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All Studbolts are manufactured in accordance with the relevant American and British Petrochemical and Gas Standards as indicated below. Studbolts are produced on the latest continuous thru-rolling principle to ensure greater uniformity of thread form and accuracy of thread pitch.

Production of bar by thread rolling in this manner is also much faster and produces no waste material. This means that manufacturing costs are lower and enables prices to remain competitive.


NACE Standards MR-01-75

This standard covers metallic material requirements for the resistance to Sulphide Stress Cracking (SSC) in equipment to be used on H2S Hydrocarbon Service
GRADE OF BOLTING &MARKING SYMBOL
B7 L7
Recommended Bolting Temperature Range Min - 460C Max-4000C Min - 1000C
Max - 4000C
BS Material Specification BS 1506-612A
BS 1506-621A
BS1510-LT100
Equivalent American Specification ASTM. A193 Grade B7 ASTM. A320 Grade
L7
Chemical Analysis B7 L7
Carbon % 0.38 0.38
0.48 0.48
Silcon % 0.20 0.20
0.35 0.35
Manganese % 0.75 0.75
1.00 1.00
Chromium % 0.80 0.80
1.10 1.10
Molybdenum % 0.15 0.15
0.30 0.30
Sulphur %

%

0.040 MAX 0.040 MAX
Phosphorus 0.040 MAX 0.040 MAX

 

Mechanical Properties B7 L7
Limiting Ruling Section 2" 4" 2" 4"
Brinell Harness Min
Max
248
335
223
310
248
335
223
310
Minimum Tensile Strength N/mm2
Ton f/in2
860
56
790
51
860
56
790
51
Minimum Yield Strength 
0.02% Proof Stress
N/mm2
Ton f/in2
730
47
660
43
730
47
660
43
Minimum Elongation % 14 14
Minimum Izod
Impact Value
J
ft.ibf.
54
40
54
40
Charpy V-Notch Low Temp
Impact Value at-1000C.
J
ft.ibf

20
15
 
     
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