1Cr5Mo steel is a martensitic metal structure. 1Cr5Mo has good oxidation resistance at about 650℃, good thermal strength below 600℃, and good shock absorption and thermal conductivity. 1Cr5Mo steel is widely used in steam turbines.
15CrMo steel plate is a heat-resistant steel with pearlite structure, which has high thermal strength (δb≥440MPa) and oxidation resistance at high temperature, and has a certain resistance to hydrogen corrosion. Due to the high content of Cr, C and other alloying elements in the steel, the hardening tendency of the steel is obvious and the weldability is poor.
Chemical composition and chemical elements of 1Cr5Mo and 15CrMo steel plate:
| Grade | C | Si | Mn | Cr | Mo | Ni | Nb | P | S |
| 1Cr5Mo | ≤0.15 | ≤0.50 | ≤0.60 | 4.00-6.00 | 0.45-0.60 | ≤0.60 | - | ≤0.030 | ≤0.020 |
| 15CrMo | 0.12-0.18 | 0.17-0.37 | 0.4-0.7 | 0.8-1.10 | 0.4-.0.55 | ≤0.30 | - | ≤0.035 | ≤0.035 |
Mechanical properties of 15CrMo steel plate:
| Grade | Tensile Strength MPa | Yield Strength MPa | Elongation (%) |
| 15CrMo | 440-640 | 235 | 21 |
1Cr5Mo and 15CrMo steel plate heat treatment in delivery state:
1Cr5Mo delivery state heat treatment: annealing
15CrMo delivery state heat treatment: hot rolling
1Cr5Mo and 15CrMo steel flaw detection standards, ultrasonic inspection: first-level flaw detection, second-level flaw detection, third-level flaw detection.
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