Heat Treatment of JIS G3461 STB 510
| Grade | Heat treatment | ||||
| Hot finished seamless steel tube | Cold finished seamless steel tube | Electric resistance welded steel tube other than hot finished or cold finished steel tube | Finished electric resistance welded steel tube | Fold finished electric resistance welded steel tube | |
| STB 510 | Normalizing | ||||
Note:The cold finished electric resistance welded steel tube which has been normalized prior to cold finishing may be finished by annealing.
Chemical Composition of JIS G3461 STB 510
| Standard:JIS G3461 | Grade | Chemical Composition Limits (%) | ||||
| C | Si | Mn | P | S | ||
| STB 510 | ≤ 0.25 | ≤ 0.35 | 1.00-1.50 | ≤ 0.035 | ≤ 0.035 | |
Mechanical Properties of JIS G3461 STB 510
| Grade | Tensile Property (N/mm2) | Yield Point or Yield Strength (N/mm2) | Rockwell hardness HRB | Elongation (%) | ||
| OD ≥20 mm | 10 mm ≤OD ＜20 mm | OD ＜10 mm | ||||
| Longitudinal | Transverse | Transverse | ||||
| STB 510 | ≥ 510 | ≥ 295 | 92 max. | ≥ 25 | ≥ 20 | ≥ 17 |
Note:The above table is only applicable for heat exchanger carbon steel tubes. The buyer can appoint the upper limit value of tensile strength. The upper limit value of tensile strength is the above shown value plus 120 N/mm2.
Tolerances of Wall Thickness
| Tolerances | Division of wall thickness (mm) |
Division of method of manufacture | Hot finished seamless steel tube | Cold finished seamless steel tube | Electric resistance welded steel tube | |||
| Division of outside diameter (mm) | Under 100 | 100 or over | Under 40 | 40 or over | Under 40 | 40 or over | ||
| Tolerances on wall thickness % | Under 2 | --- | --- | +0.4mm | +22 0 |
+0.3 | +18 0 |
|
| 0 | 0 | |||||||
| 2 or over to and excl. 2.4 | +40 | --- | +20 0 |
+18 0 |
||||
| 0 | ||||||||
| 2.4 or over to or excl. 3.8 | +35 | +35 | ||||||
| 0 | 0 | |||||||
| 3.8 or over to or excl. 4.6 | +33 | +33 | ||||||
| 0 | 0 | |||||||
| 4.6 or over | +28 | +28 | ||||||
| 0 | 0 | |||||||
| Tolerances on thickness disparity% |
--- | Within 22.8 of wall thickness | --- | --- | ||||
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