High temperature constructionsteel 1.7709 / 21CrMoV5-7 Structural Steel plate
21CrMoV5-7 is structural steel with specified high temperature and low temperature properties. Equivalent to DIN 1.7709 , it is designed for nitriding, giving similar hardness distribution as case hardening. When using nitriding the distortion due to quenching after carburising can be avoided.
21CrMoV5-7 is pearlite heat-resistant steel, which has high thermal strength (δb≥440MPa) and oxidation resistance at high temperature and has certain resistance to hydrogen corrosion. As the steel contains a higher content of Cr, C and other alloying elements, steel tend to harden more obvious, poor weldability.
| andards | Steel Grades | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | V: | Al: | Cu: | |
| DIN | 21CrMoV5-11 - 21 CrMoV 5-11 - 1.8070 | ||||||||||
| 0.17 - 0.25 | 0.3 - 0.6 | 0.30 - 0.60 | <0.035 | <0.035 | 1.2 - 1.5 | <0.6 | 1.0 - 1.2 | 0.25 - 0.35 | - | - | |
Mechanical Propoerties:
| Yield Strength Rp0.2(MPa) |
Tensile Strength Rm(MPa) |
Elongation δ5 (%): | Reduction of area ψ (%): |
Absorbed work DVM, J: |
Modulus of elasticity, N/mm²: |
Hardness |
|---|---|---|---|---|---|---|
| ≥ 550(65) | ≥ 850(85) | ≥ 16 | ≥ 60 | ≥ 63 | ≥ 211 | ≥ 235 HB |
Hot Rolled steel plate
| Diameter(mm) | Diameter Tolerance(mm) |
| ≤25.4 | -0.41～0.79 |
| 25.4～76 | -0.79～1.19 |
| 76～127 | -1.19～1.60 |
| 127～178 | -1.60～2.39 |
| 178～254 | -1.98～3.18 |
| 254～305 | -2.39～3.96 |
some other grade we can produce
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