Seamless steel pipe
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Seamless steel pipe
Hydraulic cylinder tubes standard / size / tolerance
| Working Method | Tube Dia（mm） | Length | straightness（mm/m） | Tolerance on ID | Tolerance on WT | ID roughness（um） |
| Cold-Drawing | 40-400 | ≦12m | 0.2-0.5 | / | ±5% | ≦1.6 |
| Cold Rolling | 40-150 | ≦12m | 0.2-0.5 | / | ±5% | ≦0.8 |
| Cold-Drawing-honing | 40-400 | ≦8m | 0.2-0.5 | H8-H9 | ±5% | ≦0.4 |
| Cold-Drawing-rolling | 50-300 | ≦8m | 0.2-0.3 | H8-H9 | ±5% | ≦0.2 |
| Deep hole boring-honing | 250-400 | ≦8m | 0.2-0.3 | H8-H9 | ±8% | ≦0.8 |
| Deep hole boring-rolling | 250-400 | ≦8m | 0.2-0.3 | H8-H9 | ±8% | ≦0.4 |
Mechanical property
| Steel Grade | Cold finished hard （BK） | Cold draw and stress-relieved（BK+S) | |||||
| Tensile Strength | Elongation δ 5% | Tensile Strength | Yield Strength | Elongation δ 5% | Hardness HB | Impact value （-20 CJ) | |
| 20 | ≧550 | ≧8 | ≧520 | ≧400 | ≧15 | 170 | / |
| 45 | ≧680 | ≧5 | ≧630 | ≧520 | ≧12 | 190 | / |
| Q355B | ≧660 | ≧8 | ≧620 | ≧520 | ≧15 | 190 | / |
| Q355D | ≧660 | ≧8 | ≧620 | ≧520 | ≧15 | 190 | ≧27 |
| Q355E | ≧660 | ≧8 | ≧620 | ≧520 | ≧15 | ≧190 | ≧27 |
| 25Mn | ≧640 | ≧8 | ≧620 | ≧510 | ≧15 | 190 | / |
| 27 SiMn | ≧780 | ≧5 | ≧700 | ≧580 | ≧10 | 220 | / |
Chemical composition
| Steel Grade | C | Si | Mn | P | S | Cr | Ni | Cu | V | Al |
| 20 | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | ≦0.035 | ≦0.035 | ≦0.25 | ≦0.30 | ≦0.25 | / | / |
| 45 | 0.42-0.50 | 0.17-0.37 | 0.5-0.8 | ≦0.035 | ≦0.035 | ≦0.25 | ≦0.30 | ≦0.25 | / | / |
| Q355B | ≦0.2 | ≦0.5 | ≦1.7 | ≦0.035 | ≦0.035 | ≦0.30 | ≦0.50 | ≦0.30 | / | / |
| Q355D | ≦0.18 | ≦0.5 | ≦1.7 | ≦0.030 | ≦0.025 | ≦0.30 | ≦0.50 | ≦0.30 | ≦0.15 | ≧0.015 |
| Q355E | 0.12-0.18 | 0.2-0.5 | 1.2-1.7 | ≦0.025 | ≦0.025 | ≦0.30 | ≦0.50 | ≦0.20 | 0.04-0.15 | ≧0.02 |
| 25Mn | 0.24-0.32 | 1.1-1.4 | 1.10-1.4 | ≦0.035 | ≦0.035 | ≦0.30 | ≦0.30 | ≦0.20 | / | / |
| 27SiMn | 0.22-0.29 | 0.17-0.37 | 0.7-1.0 | ≦0.035 | ≦0.035 | ≦0.25 | ≦0.30 | ≦0.25 | / | / |
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