| Steel Grade | C | SI | Mn | P | S | Cr | Ni | Cu |
| 20# | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 | 0.250 | 0.250 | / |
| 45# | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | 0.035 | 0.035 | 0.250 | 0.300 | / |
| Q345B | ≤0.2 | ≤0.5 | 1.00-1.60 | 0.030 | 0.030 | 0.300 | 0.250 | 0.08 |
| Q345D | ≤0.2 | ≤0.5 | 1.00-1.60 | 0.030 | 0.030 | 0.250 | 0.250 | 0.15 |
| 25Mn | 0.22-0.29 | 0.17-0.37 | 0.70-1.00 | 0.035 | 0.035 | / | / | / |
| 27SiMn | 0.22-0.32 | 1.10-1.40 | 1.10-1.40 | 0.035 | 0.035 | 0.300 | 0.300 | / |
| E355 | ≤0.2 | ≤0.55 | ≤1.6 | 0.025 | 0.025 | 0.250 | 0.250 | / |
| SAE1026 | 0.22-0.28 | 0.15-0.35 | 0.60-0.90 | 0.040 | 0.050 | / | / | / |
| Name | Honed tube | |||
| Standard | DIN2391, EN10305, ASTM A519, GB/T 3639-200 etc | |||
| Material | Q355B Q355D C20,ST52,E355 SAE1026.CK45 4130 4140 STKM 13C | |||
| Heat treatment | BK+S | |||
| Specification | Outer diameter(mm) | Inner diameter(mm) | ||
| 40-480mm | 30-400mm | |||
| I.D Tolerance | H8-H9 | |||
| Length | Fixed Length, Random Length(3–9m)or as requests of customers | |||
| Straightness | 0.5-1/1000 | |||
| ID roughness | RA 0.1-0.8micron(max) | |||
| Technology | Honed & SRB(SKIVED AND ROLLER BURNISHED ) | |||
| Scope | Honed tube for hydraulic cylinder, swivel crane, injection machine | |||
| Steel Grade | Rm Mpa | ReH Mpa | Elonggation | cold finished Rm Mpa | cold finished Elonggation |
| 20# | ≥520 | ≥375 | ≥15 | ≥550 | ≥8 |
| 45# | ≥600 | ≥520 | ≥10 | ≥640 | ≥5 |
| 16Mn(Q345B /D) | ≥600 | ≥520 | ≥14 | ≥640 | ≥5 |
| 25Mn | ≥600 | ≥510 | ≥15 | ≥640 | ≥5 |
| 27SiMn | ≥760 | ≥610 | ≥10 | ≥800 | ≥5 |
| St45 | ≥520 | ≥375 | ≥15 | ≥550 | ≥5 |
| E355(st52) | ≥600 | ≥520 | ≥14 | ≥640 | ≥5 |
| SAE1026 | ≥600 | ≥510 | ≥15 | ≥640 | ≥5 |
| Working method | range | ID | H8 | H9 | H10 |
| cold drawn | 25-250 | 30-50 | +0.0390 | +0.0620 | +0.1000 |
| cold rolling | 25-150 | 50-80 | +0.0460 | +0.0740 | +0.1200 |
| cold drawn-honed | 40-250 | 80-120 | +0.0540 | +0.0870 | +0.1400 |
| cold drawn-SRB | 50-250 | 120-180 | +0.0630 | +0.1000 | +0.1600 |
| cold drawn -polished | 40-250 | 180-250 | +0.0720 | +0.1150 | +0.1850 |
| cold drawn-polish-SRB | 50-250 | as required | as required | as required | as required |
