Campfire Steel
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40Cr / SCr440 / 5140 / 41Cr4 Quenched and Tempered Steel bars are the ideal materials for manufacturing Grade 8.8 and Grade 10.9 threaded rods, anchor bolts, and stud bolts. These high-strength steel round bars undergo specialized processing to ensure superior mechanical performance.
Our Q&T processing utilizes a Medium Frequency Quenching Furnace, guaranteeing excellent straightness to prevent mold damage during threading operations.
1. Material Equivalent Grades
| ASTM | JIS | DIN | BS | NF |
|---|---|---|---|---|
| 5140 | SCr440 | 41Cr4 (1.7035) | 530A40 | 42C4 |
2. Chemical Composition
| Grade | C | Si | Mn | Cr | P (≤) | S (≤) |
|---|---|---|---|---|---|---|
| 40Cr | 0.37-0.44 | 0.17-0.37 | 0.5-0.8 | 0.8-1.0 | 0.035 | 0.035 |
| SAE 5140 | 0.38-0.43 | 0.15-0.35 | 0.7-0.9 | 0.7-0.9 | 0.035 | 0.035 |
| SCr440 | 0.38-0.43 | 0.15-0.35 | 0.6-0.9 | 0.9-1.2 | 0.035 | 0.035 |
3. Mechanical Properties (8.8 & 10.9)
| Grade | Tensile (Mpa) | Yield (Mpa) | Elongation (%) | Reduction (%) | Hardness |
|---|---|---|---|---|---|
| 10.9 | ≥1040 | ≥940 | ≥9 | ≥48 | HRC 32-39 |
| 8.8 | ≥830 | ≥660 | ≥12 | ≥52 | HRC 23-34 |
