Product Description
SAE 5140 40Cr SCR440 Steel Round Bar for 8.8 grade bolt
SAE 5140 40Cr SCR440 Steel Round Bar for 8.8 grade bolt
We company are specialized to export kind grades of steel round bar to fastener manufacturer and fastener manufacturing field .our main grade for fasteners are :A36,SAE 5140,40Cr,Grade 55,Grade 60,B7,AISI 4140,10B21,10B33, and so on,.
If you have any inquiry, please feel free to contact me, we will be happy if we can solve problems and save your cost in your production.
SAE 5140 40Cr SCR440 Steel Round Bar for 8.8 grade bolt
1.Size range:
| Sizes details | diameter | 16-300mm |
| length | 1-12m(canbe customerized) |
| Sizes tolerance | length | -0/+50mm |
| Straightness | 3mm/m(max) |
2.40cr sae 5140 for 8.8 grade fasteners--equal grades
| GB | ASTM | JIS | DIN | BS | NF |
| 40Cr | 5140 | SCr440 | 41Cr4(1.7035) | 530A40 | 42C4 |
3.Chemical composition
| 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 |
4.Mechanical property
| Tensile strength | Yild strength | Elongation | reduction of area |
| Min (%) | Min (%) | Min (%) | Min (%) |
| Mpa | Mpa | Mpa | Mpa |
| 980 | 785 | 9 | 45 |
5.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 |