| Supply Condition: | Cold drawn seamless steel tubes, stress relieved in: Ready to honed/skived roller burnished and honed/skive roller burnished condition |
| Surface Roughness: | Ra - 0.2 ~ 0.4μm |
| Tolerance on Wall Thickness: | < Ø120 mm +/- 5% of wall thickness ≥ Ø120 mm +/- 5% of wall thickness |
| OD Tolerance | < Ø 40 mm +/- 0.2 mm ≥ Ø 40 mm < 100 mm +/- 0.3 mm ≥ Ø 100 +/- 0.5 mm |
| Straightness: | < 1 mm/mtr |
| Packing: | Inside surface protected with rust preventive oil, both ends sealed with plastic caps and packed in bundles tied with strips. |
| Certificate: | Material certificates as per EN 10204/3.1B |
| ID mm | Values of tolerances are in microns | |||
| H7 | H8 | H9 | H10 | |
| 30 | +21 | +33 | +52 | +84 |
| > 30 - 50 | +25 | +39 | +62 | +100 |
| > 50 - 80 | +30 | +46 | +74 | +120 |
| > 80 - 120 | +35 | +54 | +87 | +140 |
| > 120 - 180 | +40 | +63 | +100 | +160 |
| > 180 - 250 | +46 | +72 | +115 | +185 |
| > 250 - 315 | +52 | +81 | +140 | +210 |
| > 315 - 400 | +57 | +89 | +170 | +230 |
| Supply Condition | Cold finished (hard) - BK | Cold drawn & stress - relieved (BK+S) | Hardness HB | |||
| Steel Grade | Tensile Strength Mpa | Elongation (%) | Tensile Strength Mpa | Yield Strength Mpa | Elongation (%) | |
| 20# | ≥ 620 | ≥ 8 | ≥ 570 | ≥ 470 | ≥ 14 | 175 |
| 45# | ≥ 650 | ≥ 5 | ≥ 600 | ≥ 520 | ≥ 12 | 207 |
| ST52 | ≥ 640 | ≥ 5 | ≥ 600 | ≥ 520 | ≥ 15 | 190 |
| 25Mn | ≥ 640 | ≥ 5 | ≥ 600 | ≥ 510 | ≥ 15 | 195 |
| 27SiMn | ≥ 640 | ≥ 5 | ≥ 600 | ≥ 720 | ≥ 10 | 230 |
| Steel Grade | 20# | 45# | 25Mn | 27SiMn | Q345B (ST52) | *Q345D (ST52) |
| C | 0.17 ~ 0.23 | 0.42 ~ 0.50 | 0.22 ~ 0.29 | 0.24 ~ 0.32 | 0.20 | 0.18 |
| Si | 0.17 ~ 0.37 | 0.17 ~ 0.37 | 0.17 ~ 0.37 | 1.10 ~ 1.40 | 0.55 | 0.55 |
| Mn | 0.35 ~ 0.65 | 0.50 ~ 0.80 | 0.70 ~ 1.00 | 1.10 ~ 1.40 | 1.00 ~ 1.60 | 1.00 ~ 1.60 |
| P | 0.035 | 0.025 | 0.03 | 0.035 | 0.04 | 0.03 |
| S | 0.035 | 0.02 | 0.03 | 0.035 | 0.04 | 0.03 |
| CU | 0.25 | 0.20 | 0.20 | 0.30 | / | / |
| Ni | 0.30 | 0.25 | 0.30 | 0.30 | / | / |
| Cr | 0.25 | 0.25 | 0.25 | 0.30 | / | / |
| V | / | / | / | / | 0.02 ~ 0.15 | 0.02 ~ 0.15 |
| Nb | / | / | / | / | 0.015 ~ 0.06 | 0.015 ~ 0.06 |
| Ti | / | / | / | / | 0.02 ~ 0.20 | 0.02 ~ 0.20 |
| AI | / | / | / | / | / | 0.015 |
