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| * Specifications |
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ASTM A 193 B7, B7M, B16
Hardened and Tempered Steel Round Bars
Quenching and Tempered Steel Round Bars
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| * Characteristics |
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Alloy-steel and stainless steel bolting materials for high-temperature
service, of pressure vessels, valves, flanges, and fittings for high temperature
service.
the bars are to be processed by cold drawing or centerless grinding,
austenitic stainless steel bars are to be processed solution- annealed and
strain-hardened.
Also Quenched and Tempered or Normalized and tempered ferritie materials
that issubsequently cold drawn fir dimensional control shall be stress-relived
after cold drawing
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| * Chemical Composition |
| Grade |
C |
Mn |
P max |
S max |
Si |
Cr |
Mo |
V |
| B7.B7M |
0.37 ∼0.49 |
0.65 ∼1.10 |
0.035 |
0.040 |
0.15 ∼0.35 |
0.75 ∼1.20 |
0.15 ∼0.25 |
0.25 |
| B16 |
0.36 ∼0.47 |
0.45 ∼0.70 |
0.035 |
0.040 |
0.15 ∼0.35 |
0.8 ∼1.15 |
0.5 ∼0.65 |
| ∼0.35 |
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* Mechanical Properties |
| Grade |
Dia.(mm) |
Minimum
Tempering
Temp. C |
Tensile
Strength
min. Mpa |
Yield
Strength
min. 2%
offset
Mpa |
Elongation
in 2inch
min. % |
Reduction
of Area
min. % |
| B7 |
up to 65 |
593 |
860 |
720 |
16 |
50 |
| 65.01 ∼ 100 |
593 |
790 |
655 |
16 |
50 |
| B7M |
up to 65 |
620 |
690 |
550 |
18 |
50 |
| B16 |
up to 65 |
650 |
860 |
720 |
18 |
50 |
| 65.01 ∼ 100 |
650 |
760 |
655 |
17 |
45 |
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* Dimensions |
| Dia.(mm) |
Length(M) |
Dia Tolerance |
Straightness |
Shape |
| 8.0-76.2 |
2.0-7.0 |
h7, h8, h9 (*) |
0.5/1,000 |
Round, Hexagon, |
| Square & Flat |
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(*) Guarantee h9 in diameter tolerance for Cold Drawn or Smooth Turning |
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