Outer diameter:Â 25mm -500mmÂ
Wall thickness: 2-50mm
Material: ST52, Q345B, CK20, CK45, SAE1026
Standard: GB/T8713-88, GB/T3639-2009, DIN2391, EN10305
Honed tubes can be produced according to the demands of costumers that the degree of precision can reach H8/H9. Burnishing and honing service can be provided depending on the roughness requirement of inner diameter.
Material & Chemical Composition
 DIN2391 standard ST52, EN10305 standard E355, 16Mn, ASTM A106B, C20/20#, CK45
Â
| Material | C | Si | Mn | S(≤) | P(≤) | Cr | Ni | Mo | other |
|
A106B / C20# |
0.17-0.23 |
0.17-0.37 |
0.35-0.65 |
0.035 |
0.035 |
≤0.25 |
≤0.30 |
 |
Cu≤0.25 |
| CK45# | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | 0.035 | 0.035 | ≤0.25 | ≤0.30 |
 |
Cu≤0.25 |
| Q345B | ≤0.20 | ≤0.55 | 1.00-1.60 | 0.040 | 0.040 | V:0.02-0.15 | Nb:0.015-0.06 | Ti:0.02-0.20 | Alt≥0.015 |
| ST52 E355 16Mn |
≤0.20 | ≤0.55 | 1.00-1.60 | 0.045 | 0.045 | V:0.02-0.15 | Nb:0.015-0.06 | Ti:0.02-0.20 | 16Mn |
| 25Mn | 0.22-0.30 | 0.17-0.37 | 0.70-1.00 | 0.035 | 0.035 | ≤0.25 | ≤0.25 |
 |
 |
| 27SiMn | 0.24-0.32 | 1.10-1.40 | 1.10-1.40 | 0.030 | 0.030 |
 |
 |
 |
 |
| 42CrMo | 0.38-0.45 | 0.17-0.37 | 0.50-0.80 | 0.025 | 0.025 | 0.90-1.20 |
 |
0.15-0.25 |
 |
Dimension tolerance
| Inner Dia (mm) | ID Tolerance (mm) | WT Tolerance (mm) | ||||
| H7 | H8 | H9 | H10 | H11 | ||
| 30 | +0.021/0 | +0.038/0 | +0.052/0 | +0.084/0 | +0.130/0 | ±5-10%                      |
| >30-50 | +0.025/0 | +0.039/0 | +0.062/0 | +0.100/0 | +0.160/0 | |
| >50-80 | +0.030/0 | +0.046/0 | +0.074/0 | +0.120/0 | +0.190/0 | |
| >80-120 | +0.035/0 | +0.054/0 | +0.087/0 | +0.140/0 | +0.220/0 | |
| >120-180 | +0.040/0 | +0.063/0 | +0.100/0 | +0.160/0 | +0.250/0 | |
| >180-250 | +0.046/0 | +0.072/0 | +0.115/0 | +0.185/0 | +0.290/0 | |
| >250-315 | +0.052/0 | +0.081/0 | +0.130/0 | +0.210/0 | +0.320/0 | |
| >315-400 | +0.057/0 | +0.089/0 | +0.140/0 | +0.230/0 | +0.360/0 | |
Product description
| Processing Form | I. D | Length | Straightness | I. D Tolerance | I. D Rounghness |
| Cold-rolled | 30-100 | ≤ 12M | 0.3-1.0 | H8-H10 | 0.4-1.6 |
| Cold-drawn | 30-250 | ≤ 12M | 0.3-1.0 |  | 0.8-1.6 |
| Hone | 40-500 | ≤ 12M | 1000 | H8-H9 | 0.4-0.8 |
| SRB | 40-400 | ≤ 7M | 1000 | H8-H9 | 0.1-0.4 |
Product Processing
Quality Control
Packing & Delivery
Packing Details: Both end caps, bundle packing, slightly internal and external oil coating for anti-rust protection, or as required.
Delivery:  Within 20 days after advance payment.
Â
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