- SAW,ERW Pipes/Tubes
- Hot Finished Steel Bars
- Cold Finished Steel Bars
- Profile, Shaped
- Q.T.Bars
- Angles,Channels,H-Beams
- Railway Rails
Specifications
ASTM A 193 B7, B7M, B16
Hardened and Tempered Steel Round Bars
Quenching and Tempered Steel Round Bars
Characteristics
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 is subsequently cold drawn fir dimensional control shall be stress-relived after cold drawing
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 |
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/td> | 18 | 50 |
| B16 | up to 65 | 650 | 860 | 720 | 18 | 50 |
| 65.01 ∼ 100 | 650 | 760 | 655 | 17 | 45 |
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 |
(*) Guarantee h9 in diameter tolerance for Cold Drawn or Smooth Turning