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Honing pipe: The cold-rolled precision seamless steel pipe is made of seamless steel pipe finished pipe or seamless pipe waste pipe, after pickling, phosphating, saponification treatment, and then rolled by cold tube rolling machine into hydraulic steel pipe. The high precision of hydraulic steel pipe can generally be controlled at 0. It's 02-0. Within the range of 05MM, its standard is: GB3639-83, the allowable deviation of the inner warp is 0.03mm, the internal surface roughness is: Ra 0.2 ~ 0.8μm, the straightness of the hydraulic steel pipe is 0.3 ~ 1.5mm/m, which is dedicated to the diameter of the oil steel barrel.
| Chemical Composition: | ||||||||
| Steel grade | Chemical composition,% | |||||||
| C | Si | Mn | P | S | Cr | |||
| ≤ | ||||||||
| 20# | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 | 0.25 | ||
| 16Mn | ≤0.2 | ≤0.5 | 1.00-1.60 | 0.03 | 0/03 | 0.25 | ||
| ST52(E355) | ≤0.22 | ≤0.55 | ≤1.6 | 0.025 | 0.025 | 0.25 | ||
| SAE1026(25Mn) | 0.22-0.28 | 0.15-0.35 | 0.6-0.9 | 0.04 | 0.05 | / | ||
| 45# | 0.42-0.5 | 0.17-0.37 | 0.5-0.8 | 0.025 | 0.02 | 0.25 | ||
| Mechanical Property: | ||||||||
| Delivery condition | cold finished(hard)(BK) | Cold drawn and stress-relieved(BK+S) | ||||||
| Steel grade | Rm MPa | Elongation A5(%) | Rm MPa | ReH MPa | Elonggation A5(%) | |||
| 20# | ≥550 | ≥8 | ≥520 | ≥375 | ≥15 | |||
| 16Mn | ≥640 | ≥5 | ≥600 | ≥520 | ≥14 | |||
| ST52(E355) | ≥640 | ≥5 | ≥600 | ≥520 | ≥14 | |||
| SAE1026 | ≥640 | ≥5 | ≥600 | ≥510 | ≥12 | |||
| 45# | ≥650 | ≥5 | ≥600 | ≥510 | ≥12 | |||
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