42CrMo VS 42CrMoA differences
[ Time：2020-11-21 Click：929 ]
Both 42CrMo and 42CrM∑oA are Chinese GB standard high stre'♦ngth alloy steels, 42CrMoA i→σαs the main material for thread"¥≠ed bar and bolt Anyang Longteng Heat ≈<ε Treatment Material Co.,Ltd.
Please noted, Anyang L∑✘ongteng's 42CrMoA is s€∞₩pecial ordered with our own tec> £hnical requirements, short for↕π♣ "LT 42CrMoA" in belo>→ w article:
STANDARD: GB/T 3077-2015
CLASSIFICATION & 'πγCODE:
Steel should be divided into t€↔he following three types a§®"cc. to metallurgical qua →lity:
1) High quality steel;
2) Senior high quality steel (&₽πquot;A" added)
3) Extremely high quality✔∞ steel ("E" ad≈¥©ded)
Chemical composition acc.to AnΩ₩yang Longteng Technica×≠l requirements
| C | Si | Mn | P | S | Cr | Mo | |
| 42CrMoA | 0.38-0.45 | 0.17-0.37 | 0.50-0.8 | ≤0.02 | ≤0.02 | 0.9-1.2 | 0.15-0.25 |
Note: total value of P+S shou§♣ld not more than 0.03
GB/T 3077 requirements：
| P | S | Cu | Cr | Ni | Mo | |
| no higher than | ||||||
| 42CrMo | 0.03 | 0.03 | 0.3 | 0.3 | 0.3 | 0.1 |
| 42CrMoA | 0.02 | 0.02 | 0.25 | 0.3 | 0.3 | 0.1 |
| 42CrMoE | 0.02 | 0.01 | 0.25 | 0.3 | 0.3 | 0.1 |
It is known that the conteδ♦<nt of sulfur and phosphorus in the stee♥σ×l will bring great damage to steel mateα↕rial's performance an±♦≤d strength. "A"φ ★; in 42CrMoA refers to seΩ₹§rnior high quality steel with lessΩ impurities, higher properties.&n₹≈≤✘bsp;
Acid corrosion LP structur♥✘£e level
| Ingot Segregation | Central Loosening | Ordinary Loodening | Ordinary Point Segregation | Edge Pont Segregation | |
| no higher than | |||||
| 42CrMo | 3 | 3 | 3 | 1 | 1 |
| 42CrMoA | 2 | 2 | 2 | not permitted | |
| LT42CrMoA | 1.5 | 1.5 | 1.5 | ||
| 42CrMoE | 1 | 1 | 1 | ||
Inclusion types and qual∞ <ification
| Group A | Group B | Group C | Group D | Ds | |||||
| Thick | Fine | Thick | Fine | Thick | Fine | Thick | Fine | ||
| 42CrMo | ≤3.0 | ≤2.5 | ≤3.0 | ≤2.0 | ≤2.0 | ≤1.5 | ≤2.0 | ≤1.5 | &nb±β®sp; --- |
| LT42CrMoA | ≤2.0 | ≤1.5 | ≤2.0 | ≤1.5 | ≤2.0 | ≤1.5 | ≤2.0 | ≤1.5 | ≤2.0 |
| 42CrMoE | ≤2.5 | ≤2.0 | ≤2.5 | ≤1.5 | ≤1.5 | ≤1.0 | ≤1.5 | ≤1.0 | |
