36CrB4
1.7077Boron micro-alloyed QT steel — 0.0008-0.0050% B multiplies hardenability dramatically at minimal cost. Achieves similar through-hardening to 41Cr4 or 42CrMo4 at lower alloy cost. THE cost-optimized approach for automotive fasteners, bolts, and cold-forged QT parts. Used for high-strength bolts (class 10.9/12.9), tie rods, stabilizer bars, and any mass-produced QT part where total alloy cost per ton matters.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇪🇺 | EN | Europe | 36CrB4 / 1.7077 | 1.7077 | 100% |
Sources: EN 10083-3
Chemical composition comparison (wt%)
Side-by-side: 36CrB4 (EN 10083-3) vs 36CrB4 / 1.7077 (EN) (EN 10083-3)
| Element | 36CrB4 (EN 10083-3) | 36CrB4 / 1.7077 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.33–0.39% | — |
| Si | — | 0–0.4% | — |
Mechanical properties
Compatibility verdict
36CrB4 and 36CrB4 / 1.7077: 100% composition match
Related materials
42CrMo4
1.7225High-strength quenched and tempered chromium-molybdenum steel. Widely used for shafts, gears, crankshafts, connecting rods, and high-strength bolts. Excellent hardenability and good fatigue resistance.
34CrNiMo6
1.6582High-strength quenched and tempered Cr-Ni-Mo steel. Excellent hardenability and toughness, suitable for large cross-sections. Used for heavy-duty shafts, gears, turbine parts, and aerospace components.
16MnCr5
1.7131Low-carbon case-hardening steel with manganese and chromium. Excellent for carburizing to produce a hard, wear-resistant surface with a tough core. Standard choice for gears, camshafts, piston pins, and transmission components.
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