| 1.7218 | 4130 |
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This grade is medium-carbon, chromium-molybdenum steel. Available as hot worked and cold finished bar and seamless tube, this steel is intended for general purpose applications. Variations in heat treatment can obtain a broad range of strength and toughness. This steel has good hardenability, strength, wear resistance, toughness, and ductility. In the heat treated condition, they offer good strength and toughness for moderately stressed parts. This grade is available in forging quality, aircraft quality, and premium aircraft quality steel.
| Standard Designation | Grade, Class, Type, Symbol or Name | Steel Number | UNS Number | Product Form/Heat Treatment | Thickness | Yield Strength, min | Tensile Strength, min | Elongation, min, % | Other | |||
| t, mm | t, in. | N/mm2 or MPa | ksi | N/mm2 or MPa | ksi | |||||||
| EN 10250-3:1999 | 25CrMo4 | 1.7218 | — | QT | ≤ 70 | — | 450 | — | 700 | — | 15 | 50 J at RT |
| 70 < t ≤ 160 | — | 400 | — | 650 | — | 17 L; 13 T | L: 45 J at RT T: 27 J at RT | |||||
| 160 < t ≤ 330 | — | 380 | — | 600 | — | 18 L; 14 T | L: 38 J at RT T: 22 J at RT | |||||
Composition:
| %C | %Si | %Mn | %P | %S | %Cr | %Mo | %Ni | %Others |
| 0,22-0,29 | ≤0,40 | 0,60-0,90 | 0,035 | 0,035 | 0,90-1,20 | 0,15-0,30 | – | – |
Hot working:
Forging temperature range: 1100-850℃
Note: Heat to 1240 ℃. Do not forge below 850.
Heat treatment:
| Soft annealing ℃ | HB 30-soft annealed | Normalizing ℃ | Hardening temperature for quenching in Water ℃ | Hardening temperature for quenching in Oil ℃ | Tempering temperature ℃ |
| 680-720 | 212 | 860-900 | 840-870 | 850-880 | 540-680 |
Main application:
Bushes, arbors, control components, links
Shape of product:
Round, flat, step shape, ring, disc, shaft, other shape depend on customer needs
