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steel round bar 40Cr/sae 5140 for 8.8 grade bolt
Grade:40Cr/SAE5140/C/SCr440
1.Size&Tolerance
| Sizes details | diameter | 8-310mm |
| length | 1-12m(canbe customerized) | |
| Sizes tolerance | length | -0/50mm(max) |
| Straightness | 3mm/m(max) |
2.Chemical compisition
| C | Si | Mn | Cr | Ni(≤) | Cu(≤) | P(≤) | S(≤) |
| 0.37-0.44 | 0.17-0.37 | 0.5-0.8 | 0.8-1.0 | 0.3 | 0.03 | 0.035 | 0.035 |
3.Mechanical property
| Tensile Strength | Yield strength | Elongation | Reduction Area | ||||
| Mpa (min) | Mpa(min) | %(min) | %(min) | ||||
| 980 | 785 | 9 | 45 |
steel round bar 40Cr/sae 5140 for 8.8 grade bolt
Grade:40Cr/SAE5140/C/SCr440
*Bars from different heats will not be mixed and dispatched.
*Bars will be bundles and securely metal strapped in 3 min places of the bar length and tagged properly.
*For further processing products such as cold drawn/peeled or heat treated goods, plastics bag wrapped or pallet loading is available according to customer’s demands.
steel round bar 40Cr/sae 5140 for 8.8 grade bolt
Grade:40Cr/SAE5140/C/SCr440
Quality control
1.Processing Line:
Iron - hot metal pretreatment - Converter - Refining --VD / RH- - Continuous Casting - Hot Rolling (KOCKS) - heat --UT Check - Processing and Distribution Center
Electric Furnace - Refining --VD / RH- - Continuous Casting - Hot Rolling (KOCKS) - heat --UT Check - Processing and Distribution Center
2.Gas content level:O2 - <20 ppm H2 - <2 ppm N2- <100 ppm
3.Grain Sizes:5-8
4. non-metallic inclusions contorlling level
| A | B | C | D | |
| MAX | MAX | MAX | MAX | |
| Thin | 2 | 2 | 2 | 2 |
| Thick | 1 | 1 | 1 | 1 |
