Products Description
Our Advantages
- Heat Treatability and Hardness Control: Chromoly Steel Tubing can be normalized, quenched, and tempered to achieve various hardness and strength levels for specific applications.
- Excellent Wear Resistance: 4140 is particularly well-suited for components exposed to wear, high pressure, or surface contact, such as gears and hydraulic components.
- Excellent Toughness and Fatigue Resistance: Our Chromoly Steel Tubing withstands cyclic loads, shock, and vibration, making it suitable for suspension components, drive shafts, and mechanical parts.
application areas
- Aerospace: Aircraft fuselage structures, landing gear components, engine mounts and supports, etc.
- Automotive: Roll cages, chassis and suspension arms, drive shafts, and steering components, etc.
- Oil and Gas: Downhole drilling tools, hydraulic cylinders and hydraulic hoses, wellhead equipment, and pressure control systems, etc.
- Heavy Machinery and Equipment: Shafts, axles, and spindles, loaders, and crane booms, etc.
- General Engineering and Manufacturing: Precision machine parts, high-stress structural supports, etc.
Chemical Composition
| Grade | C (%) | Mn (%) | P (%) Max | S (%) Max | Si (%) | Cr (%) | Mo (%) |
| 4130 | 0.28–0.33 | 0.40–0.60 | 0.035 | 0.040 | 0.15–0.35 | 0.80–1.10 | 0.15–0.25 |
| 4140 | 0.38–0.43 | 0.75–1.00 | 0.035 | 0.040 | 0.15–0.35 | 0.80–1.10 | 0.15–0.25 |
Mechanical Properties
| Property | Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| 4130 | Normalized | 560–670 | ≥ 460 | ≥ 21 | 143–197 |
| 4140 | Q&T | 850–1000 | ≥ 655 | ≥ 18 | 197–255 |
Possible Alternative Grades
- SAE 4130, SAE 4140: Directly equivalent alloy compositions, widely used in North America.
- BS 708M40 (close to 4140): Widely used in UK industry for shafts, spindles, and high-strength components.
- GB 30CrMo (applicable to 4130), GB 42CrMo (applicable to 4140): Widely used in Asia for structural and mechanical applications.
- JIS SCM430 (applicable to 4130), JIS SCM440 (applicable to 4140): Japanese equivalents, commonly used in automotive and mechanical parts.
- DIN 30CrMo4 (applicable to 4130), DIN 42CrMo4 (applicable to 4140), EN 1.7218, EN 1.7225: Common in Europe, with similar strength, hardenability, and weldability.
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