Products Description
Chromoly Steel Tubing is made from high-quality materials, including 4130 and 4140. AISI 4130 and AISI 4140 are the most commonly used chromium-molybdenum steel grades in engineering machinery applications.
Our 4130 chromium-molybdenum tubes are forged at temperatures between 950°C and 1230°C, exhibiting excellent mechanical properties at both room and high temperatures. They also have a low carbon content, making them easy to weld, and excellent machinability, facilitating bending, welding, drilling, and other processing.
4140 has poorer machinability and weldability, requiring preheating before welding and heat treatment after welding. However, 4140 has superior high-temperature resistance, remaining unbroken for 2000 hours at 600°C.
Product Specifications
| Standards | ASTM A519 |
| Steel Grades | 1010 1012 1015 1016 1017 1018 1019 1020 1021 1022 1025 1026 1030 1035 1040 1045 1050 1518 1524 1541 1330 4130 4137 4140 |
| Equivalent Standards | EN 10297-1 25CrMo4 / 34CrMo4 / 42CrMo4; DIN 1.7218 / 1.7225; JIS SCM415 / SCM420; GB 30CrMo / 42CrMo |
| Outer Diameter (OD) | 6 mm – 323 mm (0.24 in – 12.7 in) |
| Wall Thickness (WT) | 1 mm – 40 mm (0.04 in – 1.57 in) |
| Length | 4–12 m,or customizable |
| Surface Treatment | Black surface |
| Production Process | Cold Drawn |
| Condition | Annealed, Normalized, Quenched & Tempered (Q&T), Stress Relieved |
Customized Services
- TORICH supports precision tolerance customization services and offers non-standard custom sizes. We provide length-cutting services with an error range of ±1mm.
- We offer V-shaped, U-shaped, and X-shaped beveling and bending services; for hydraulic components, we support flaring and necking.
- We offer surface treatments such as black finish, pickling, oiling, phosphating, sandblasting, and rust-proof coating, and can perform internal honing.
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
- 20CrMo is a low-alloy chromium-molybdenum steel with a cost advantage. It is commonly used in construction machinery, automotive transmission components, and heavy equipment parts.
- 25CrMo4 is an equivalent grade to 4130, offering similar strength and weldability. It is often used to manufacture shafts, gears, and other parts subjected to high stress and wear.
- For applications that do not require excessively high strength, AISI 1026 is a suitable choice. It is cost-effective, and its hardness and wear resistance can be improved through quenching processes, making it suitable for the mechanical field.
application areas
4130 and 4140 are the most widely used materials in the field of engineering machinery.
Among them, 4130 steel is more suitable for structural components in engineering machinery and frame structures of agricultural engineering machinery due to its processing performance.
4140 is often used to manufacture heavy machinery, including hydraulic cylinders, rollers, frames, pins, and various tooling fixtures.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
We offer a wide range of packaging options, including plastic end caps, woven bags, wooden crates, and iron frames. Custom packaging solutions, logo branding, and other personalized requirements are also available to meet specific customer needs.
FAQ
Q: Which steel has higher strength, 4130 or 4140?
A: Generally, 4140 has higher strength. 4140 has a carbon content of 0.38-0.43%, higher than 4130's 0.28-0.33%. After tempering, 4140 typically exhibits higher tensile and yield strengths than 4130, making it more suitable for components that bear high loads.
Q: On excavators, which parts are suitable for 4130 and which for 4140?
A: Non-primary load-bearing components, such as hydraulic hose supports and small structural parts, can use 4130 steel, while primary load-bearing structural components like the excavator's boom and arm require 4140.
Q: Which industries typically use ASTM A519 chromium-molybdenum steel pipe?
A: Commonly used in automotive manufacturing, aerospace components, mining and drilling machinery, and industrial machinery manufacturing.
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