| Customization: | Available |
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| After-sales Service: | Free |
| Warranty: | 1 Year |
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| GRADE | external diameter | wall thickness | internal diameter | GRADE | external diameter | wall thickness | internal diameter |
| 35# | 37.5 | 9.75 | 18 | 20# | 35.6 | 6.8 | 22 |
| 42CrMo | 35.5 | 6 | 23.5 | 20# | 35.5 | 7.3 | 20.9 |
| 35# | 35.1 | 7.55 | 20 | 20# | 34.5 | 10.3 | 13.9 |
| 20# | 34.5 | 5.3 | 23.9 | 35# | 34.5 | 9 | 16.5 |
| 37Mn5 | 33.8 | 6.9 | 20 | 20# | 32.1 | 6.2 | 19.7 |
| 20# | 32.1 | 5.2 | 21.7 | 20#/35# | 32 | 6.4 | 19.2 |
| 20# | 32 | 6 | 20 | 35# | 32 | 6.15 | 19.7 |
| 20# | 32 | 5.15 | 21.7 | 20# | 32 | 6.05 | 19.9 |
| 20# | 31.5 | 5.3 | 20.9 | 20# | 31.5 | 4 | 23.5 |
| 20# | 30.7 | 5.4 | 19.9 | 20# | 30.6 | 4.8 | 21 |
| 20# | 30.6 | 5.3 | 20 | 20# | 30.6 | 4.8 | 21 |
| 35# | 30.5 | 7.2 | 16.1 | 20# | 30.5 | 5.3 | 19.9 |
| 20# | 30.5 | 3.5 | 23.5 | 20#/35# | 30.5 | 6.5 | 17.5 |
| 35# | 30.5 | 5.3 | 19.9 | 20# | 29.5 | 5.25 | 19 |
| 20# | 29.4 | 4.5 | 20.4 | 20# | 29.4 | 4.75 | 19.9 |
| 20# | 29.4 | 4.5 | 20.4 | 20# | 29.4 | 4.75 | 19.9 |
| 20# | 29.3 | 5 | 19.3 | 20# | 29 | 5.5 | 18 |
| 20# | 29 | 5 | 19 | 35# | 29 | 9 | 11 |
| 20# | 28.6 | 3 | 22.6 | 20# | 28 | 4 | 20 |
| 20# | 27.5 | 4.75 | 18 | 20# | 27.5 | 4.3 | 18.9 |
| 20# | 27.5 | 4.5 | 18.5 | 20# | 27.5 | 5.25 | 17 |
| 20# | 27.5 | 4.25 | 19 | 20# | 26.5 | 4.75 | 17 |
| 20# | 26.5 | 3.5 | 19.5 | 20# | 26 | 3.85 | 18.3 |
| Q355 | 26 | 4.4 | 17.2 | 20# | 25.7 | 4.3 | 17.1 |
| 20# | 25.7 | 3.85 | 18 | 35#/20# | 25.6 | 5 | 15.6 |
| 20# | 25.4 | 3.5 | 18.4 | 20# | 25.4 | 4.2 | 17 |
| 20# | 25.4 | 4.7 | 16 | 20# | 25.4 | 3 | 19.4 |
| 20# | 25 | 4 | 17 | 20# | 24.5 | 4.3 | 15.9 |
| 20# | 24.5 | 4.75 | 15 | 20# | 23.1 | 3.55 | 16 |
| 20# | 23 | 3 | 17 |
| category | Serial Number | Inspection items | technical requirement | Testing methods | Sampling frequency |
| 1.appearance | 1 | check | Check if the identification sheet matches the specifications, furnace batch number, and material | visualization | all |
| 2 | SURFACE QUALITY | There are no defects such as rust, cracks, peeling, or pulling marks on the inner and outer surfaces | visualization | Take 2 samples from each batch | |
| 2.size | 3 | Outer diameter * wall thickness | According to the drawing requirements | Outside micrometer and Wall thickness micrometer | Take 10 samples from each batch |
| 4 | inside diameter | According to the drawing requirements | dial caliper guge | Take 10 samples from each batch | |
| 3.mechanical property | 5 | flatten | According to technical requirements, cracks or fissures are not allowed to appear when pressed to a certain height | Universal testing machine | Take 2 samples from each batch |
| 6 | flaring | According to the technical requirements, there should be no cracks at the expansion point when the expansion reaches the required size | Universal testing machine | Take 2 samples from each batch | |
| 7 | Bend and break | The fracture surface is delicate and uniform, with obvious plastic deformation and no visible reflective grains | Universal testing machine | Take 2 samples from each batch | |
| 8 | stretch | Tensile strength, yield strength, and elongation meet technical requirements | Universal testing machine | Take 2 samples from each batch | |
| 9 | Element content | The element content meets the standard requirements | a spectrometer | Take 2 samples from each batch |
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