Product Introduction
Inside and Outside wall of Precision seamless steel pipe with high-precision, high-quality finish, after heat-treated, steel pipe without oxide layer, the inner wall with cleanliness, steel to withstand high pressure, not deformation of the cold bending, flaring, flattening without cracks, for a variety of complex deformation and machining treatment. The seamless precision seamless steel tubes can be used for a wide range of precision mechanical spare for car and cylinder accord to standard:DIN 2391, EN10305-1,DIN17175 etc. Material: ST35,ST45,ST52 Manufacturing method: Cold-Rolled, Cold-Drawn Delivery condition: BK,BKS,SR,GBK,NBK. Packing: Bundles by steel strips. External packing by wooden cases if the wall thickness. Oil-coating is generally necessary especially for export. Application: Used in hydraulic & pneumatic cylinder ,automobile and other mechanical device.
Product Display
Chemical Composition(%)
| Grade | Material | C | Si | Mn | P | S |
| max | max | max | max | max | ||
| St35 | 1.0308 | 0.17 | 0.35 | 0.4 | 0.05 | 0.05 |
| St45 | 1.0408 | 0.21 | 0.35 | 0.4 | 0.05 | 0.05 |
| St52 | 1.0508 | 0.22 | 0.55 | 1.6 | 0.05 | 0.05 |
Mechanical and Technological Properties
| Grade | Material | Cold-Finished /Hard(BK) | Cold-Finished/Soft (BKW) | ||
| Rm(Mpa) | A(%) | Rm(Mpa) | A(%) | ||
| St 35/E235 | 1.0308 | 480 | 6 | 420 | 10 |
| St 45 | 1.0408 | 580 | 5 | 520 | 8 |
| St 52/E355 | 1.0508 | 640 | 4 | 580 | 7 |
| Grade | Cold Finished (Soft)(BKW) | Annealed (GBK) | Normalized (NBK) | |||||
| Rm(Mpa) | ReH (Mpa) | A(%) | Rm(Mpa) | A(%) | Rm (Mpa) | ReH (Mpa) | A(%) | |
| St 35/E235 | 420 | 315 | 14 | 315 | 25 | 340-470 | 235 | 25 |
| St 45 | 520 | 375 | 12 | 390 | 21 | 440-570 | 255 | 21 |
| St 52/E355 | 580 | 450 | 10 | 490 | 22 | 490-630 | 355 | 22 |