24 July 2021 Structural Steel Bar
20CrMoH Structural Steel Bar
20CrMoH is a widely used structural steel, 20CrMoH bar, 20CrMoH bonded steel, 20CrMoH steel, smelting process is stable, good hardenability, carbonitriding process performance is good, the amount of deformation after heat treatment, no temper brittleness , Processing and manufacturing performance and welding performance are good. 20CrMoH should make medium and small module gear, shaft and so on. It can also be used for the blades below the medium pressure where the steam turbine works in the overpressure steam zone.
Chemical Composition:
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Mo(％) | Cu(％) |
|---|---|---|---|---|---|---|---|
| 0.17～0.23 | 0.17 ~ 0.37 | 0.55 ~ 0.90 | ≤0.030 | ≤0.030 | 0.85～1.25 | 0.15 ~ 0.35 | ≤0.25 |
Mechanical Propoerties:
| Yield Strength Rp0.2(MPa) | Tensile Strength Rm(MPa) | Elongation δ5 (%): | Reduction of area ψ (%): | Impact energy Akv (J): | Impact toughness value αkv (J/cm2) | Hardness |
|---|---|---|---|---|---|---|
| ≥ 1079 | ≥ 1258 | ≥ 12 | ≥ 53 | ≥ 95 | ≥ 59(6) | ≥ 295 HB |
Equivalent Grade:
| China | USA | Germany | Japan | France | UK | ISO | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard | Grade | Standard | Grade | Standard | Grade (Steel Number) | Standard | Grade | Standard | Grade (Steel Number) | Standard | Grade (Steel Number) | Standard | Grade |
| GB/T 3077 | 20CrMo | AISI SAE; ASTM A29/A29M | 4120 | DIN EN 10083-3 | 25CrMo4 (1.7218) | JIS G4053 | SCM420 | NF EN 10083-3, NF A35-551 | 25CrMo4 (1.7218), 18CD4 | BS EN 10083-3, BS 970 Part 1 | 25CrMo4 (1.7218), 708M20 | ISO 683-1 | 18CrMo4 |
Applications:
20CrMo alloy steel is used in the manufacture of non-corrosive media in chemical equipment and high pressure pipes, fasteners, steam turbines, boiler blades and forgings with working temperature below 250 °C, and important carburizing parts such as gears and shafts in general machines. It can also be used in place of 1Cr13 steel to manufacture medium pressure, low pressure steam turbines in the superheated steam zone pressure stage working blades.