Seamless steel pipes are divided into hot-rolled seamless pipes and cold-drawn seamless pipes.
Hot rolled tubes are forged, pierced, rolled and formed. Generally, large-diameter, thick-walled seamless pipes adopt this form; cold-drawn pipes are made of cold-drawn pipe blanks, with relatively low material strength and smooth appearance and internal control surfaces. Small-diameter, thin-walled seamless pipes mostly fall into this category.
Chemical composition of Materials:
| Steel Grade | C | Si | Mn | P≤ | S≤ | Cu≤ | Ni≤ | Cr≤ | Mo≤ | V≤ |
| ASTM A106 B | ≤0.3 | / | ≤1.2 | 0.05 | 0.06 | 0.4 | 0.4 | 0.4 | 0.15 | 0.08 |
| ST35 | ≤0.18 | 0.15-0.35 | 0.35-0.65 | 0.035 | 0.035 | 0.25 | 0.25 | 0.25 | / | / |
| ST45 | ≤0.25 | 0.15-0.35 | 0.5-0.8 | 0.035 | 0.035 | 0.25 | 0.25 | 0.25 | / | / |
| ST52 | ≤0.2 | ≤0.55 | ≤1.5 | 0.035 | 0.035 | 0.25 | 0.25 | 0.25 | / | / |
| CK45 | 0.42-0.5 | 0.17-0.37 | 0.5-0.8 | 0.035 | 0.035 | 0.25 | 0.25 | 0.25 | / | / |
Mechanical Properties
| Steel Grade | Rm MPa | ReH Mpa |
| ST45 |
≥520 |
≥375 |
| ST52(E355) |
≥600 |
≥520 |
| SAE1026 |
≥600 |
≥510 |
| 16Mn |
≥600 |
≥520 |
| 20# |
≥520 |
≥375 |
| Standard | DIN2391, EN10305, DIN17175,JIS G3445, ASTM A519, GB/T 8713... |
| Material | ST37/ST45/ST52/25Mn/27SiMn/E355/SAE1026 |
| Outer diameter | 20mm-480mm |
| Wall thickness | 3mm-25mm |
| Length | 1-12m, random or fixed, as the clients' requests |
| Technology | High precision Cold drawn/ Cold rolled |
| Heat treatment | BK/BKS/NBK |
