The difference between 2Cr13 steel and 3Cr13 steel
| Chemical composition (%) | |||||||
| Steel Grade | W | Si (≤) | Mn (≤) | P(≤) | S (≤) | Cr | Ni (≤) |
| 2Ch13 | 0.16 – 0.25 | 1.00 | 1.00 | 0.040 | 0.030 | 12:00 – 2:00 pm | 0.60 |
| 3Ch13 | 0.26 – 0.35 | 1.00 | 1.00 | 0.040 | 0.030 | 12:00 – 2:00 pm | 0.60 |
| Mechanical properties | |||||||
| Steel Grade | Tensile strength (MPa) | Yield strength (MPa) | Stretching % | Reduction in area % | Impact energy (J) | Hardness (quenching and tempering) | Hardness (Annealing) |
| 2Ch13 | ≥640 | ≥440 | ≥20 | ≥50 | ≥63 | ≤ 192HB | ≤223HB |
| 3Ch13 | ≥735 | ≥540 | ≥12 | ≥40 | ≥24 | ≤ 217HB | ≤ 235HB |
Both are martensitic stainless steel, as you can see in the table, 2Cr13 versus 3Cr13 just have different carbon content in the chemical composition. The strength and hardness of steel mainly depend on the carbon content. The higher the carbon content, the greater the strength, but the lower the corrosion resistance. The main effect of chromium is to improve corrosion resistance.
2Cr13 vs 3Cr13 have little difference in mechanical properties such as yield strength, tensile strength and annealing hardness. After heat treatment, 3Cr13 has higher hardness than 2Cr13, but the corrosion resistance is worse than 2Cr13.
