EN Standard 25CrMo4 34CrMo4 42CrMo4 Hot Rolled Alloy Steel Plate
- Custom sizes available
- Complete range of specifications
- Large inventory in stock
- Sheet metal fabrication services available
- Overview
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Product Induction
25CrMo4, 34CrMo4, and 42CrMo4 are European standard chromium-molybdenum quenched and tempered steels. Hot-rolled plates are supplied in black-skinned or controlled-rolled condition, with thicknesses typically ranging from 3 to 60 mm. These steels exhibit high strength and heat resistance.
Products Pictures
Specification
| Product Name | EN Standard 25CrMo4 34CrMo4 42CrMo4 Hot Rolled Alloy Steel Plate |
| Grade | 25CrMo4 34CrMo4 42CrMo4 |
| Technique | Hot Rolled(or cold rolled,pickled) |
| Strength Grade | Medium carbon-Medium alloy |
| Steel Grade Stocking |
Common Carbon Steel: A36,A36M,JJ195L,11235L,JJ235M,SAPH400-C,SS40-ZJ,A36-001,SS40-FST,Q235C Q235D Checkered Plate:BDQ235B,BDSS400TS,BDQ235B-Z01 Cold Rolled base Material:Q195,SPHC,SPHD,DD11,DD12,SAE1006/1008/1010/1012/1016/1018 Low Alloy High-Strength Steel:Q345B,Q355B-ZH,Gr50,S235JR,Q355C,S275JR,BDQ355B,S355J2 Tool Steel:20#,35#,40#,S45C and other automotive steel, construction machinery steel, container steel, weather resistant steel. |
| Thickness |
25CrMo4:4-40 mm 34CrMo4:5-60mm 42CrMo4:6-150mm |
| Certificate | ISO9001,RoHS |
Surface treatment |
Typically involves acid washing or shot blasting followed by oiling. |
| Width | steel sheet:500-2500mm,medium thick steel plate:1000-3000mm |
| Color | Black,Or painted according to customer requirements |
| Application | Medium- and high-pressure valves, hydraulic props, drilling couplings, compressor crankshafts, axle half-shafts, high-pressure gas cylinders, oil lifting hooks, gear rings, large-scale rollers |
Chemical Composition
| Grade | C % | Cr % | Mo % | Mn % | P max | S max |
| 25CrMo4 | 0.22-0.29 | 0.90-1.20 | 0.15-0.30 | 0.60-0.90 | 0.025 | 0.035 |
| 34CrMo4 | 0.30-0.37 | 0.90-1.20 | 0.15-0.30 | 0.60-0.90 | 0.025 | 0.035 |
| 42CrMo4 | 0.38-0.45 | 0.90-1.20 | 0.15-0.30 | 0.60-0.90 | 0.025 | 0.035 |
Mechanical Properties
| Grade | tensile strength（MPa） | yield strength（MPa） | Elongation% |
| 25CrMo4 | 900-1100 MPa | ≥700 MPa (≤16 mm) | ≥12 % |
| 34CrMo4 | 800-950 MPa | ≥650 MPa (≤16 mm) | ≥14 % |
| 42CrMo4 | 1100-1300 MPa | ≥900 MPa (≤16 mm) | ≥10 % |
Material Properties and Application of 25CrMo4, 34CrMo4, and 42CrMo4
25CrMo4: Medium-low strength + high toughness welded components, suitable for high-pressure pipelines, hydraulic props, carburized gears, and cryogenic valves.
34CrMo4: Excellent strength and toughness, heat-resistant up to 500°C. Suitable for high-pressure gas cylinders, rotors, spindles, deep well drill pipes, and -50°C hydrogen storage tanks.
42CrMo4: Ultra-high strength and wear resistance. Suitable for heavy-duty gears, connecting rods, rollers, mining drill tools, and large crankshafts.
Material Selection Recommendations
1. For wall temperatures ≤300°C where welding convenience is required, select 25CrMo4 hot-rolled plate. Post-weld tempering is unnecessary.
2. For wall temperatures 300-400°C requiring higher-strength steel plates, select 34CrMo4. Post-tempering yield strength reaches 650-800 MPa with limited cost increase.
3. For high-load, wear-resistant, or low-temperature impact (-40°C) environments, select 42CrMo4. After quenching and tempering, impact resistance ≥35 J, with hardness exceeding 300 HB.
Sheet Metal Fabrication
Capable of laser cutting, bending, welding, drilling, and beveling thin plates, medium-thick plates, steel pipes, and other materials. Post-forming surface treatments such as painting and galvanizing are performed according to customer requirements.
FAQ
Q: What are the common thicknesses and widths for hot-rolled steel plates?
A: Spot market products are most concentrated in the 4–60 mm thickness range, with widths typically between 1500–2500 mm.
Q: Is hot-rolled black plate suitable for direct welding?
A: For 25CrMo4 with carbon equivalent ≤0.50 and thickness ≤20 mm, no preheating is required. For 34/42CrMo4, preheat at 150–250°C with controlled layer temperature. Perform stress relief at 600°C post-welding to prevent cold cracking.
Q: What are the common application areas for 25CrMo4, 34CrMo4, and 42CrMo4 alloy steel plates?
A: Petroleum reactors, heat exchangers, boiler drums, high-pressure gas cylinders, nuclear power pressure vessels, hydroelectric turbine casings, large-diameter tube sheets, etc.
Q: Price ranking among the three?
A: For the same thickness, the price order is 42CrMo4 > 34CrMo4 > 25CrMo4. If the Q+T condition is required, additional heat treatment fees apply.
Q: How can secondary oxidation of hot-rolled steel sheets be prevented?
A: Methods include “shot blasting + rust-preventive oil” or “plastic film coating.” For maritime exports, vacuum-sealed composite wooden crates are recommended to prevent salt spray corrosion on surfaces.
Q: How can I get your quotation as soon as possible?
A:Please contact:
Email:[email protected]
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