Views: 0 Author: Site Editor Publish Time: 2025-07-23 Origin: Site
In fields such as oil drilling, aerospace, automobile manufacturing and heavy machinery that have strict requirements on material performance, 4130 and 4140 seamless alloy steel pipes have become their "performance benchmarks" with their excellent mechanical properties and process adaptability. However, the two specifications with sizes of 38×2mm and 42×2mm are mainly used in racing roll cages, playing an important role in structural support and racing safety.
Both 4130 and 4140 belong to the chromium-molybdenum alloy steel (Chromoly Steel) of SAE/AISI standards. The core strengthening elements are 0.8%-1.1% chromium (Cr) and 0.15%-0.25% molybdenum (Mo), supplemented by different carbon contents to achieve performance differentiation:
4130 alloy steel: carbon content 0.28%-0.33%, yield strength ≥441MPa, tensile strength ≥621MPa, elongation ≥20%. Its advantages lie in its excellent weldability and formability, and it is suitable for scenes requiring cold processing or welding.
4140 alloy steel: The carbon content is increased to 0.38%-0.43%, the yield strength is ≥621MPa, and the tensile strength is ≥855MPa. The higher carbon content gives it stronger hardenability and wear resistance, and it is suitable for high-stress environments.
High strength and high toughness: 4130 steel pipe has outstanding toughness and can withstand impact loads; 4140 steel pipe has higher strength and can withstand greater pressure and load. Both have good comprehensive mechanical properties and can adapt to a variety of complex working conditions. For example, 42×2mm, 38×2 steel pipes are often used in racing roll cages, which can effectively provide solid support.
Good hardenability: Both materials have good hardenability, and can obtain uniform mechanical properties at larger cross-sectional sizes, and can significantly improve performance after heat treatment.
Corrosion resistance: The presence of chromium makes the steel pipe have a certain degree of corrosion resistance. In some environments containing corrosive media, it can maintain good performance and extend its service life.
Precision manufacturing process: It is formed by cold rolling or cold drawing process, with a wall thickness deviation of ≤±0.05mm, a low inner surface roughness, and reduced fluid transportation resistance.
Aerospace: 4130 steel pipe is often used to manufacture aircraft gears, piston pins and other parts to meet high strength and low weight requirements and ensure flight safety.
Oil and gas: 4140 steel pipe can be used as oil well casing, drill pipe joints, etc., which can withstand high pressure and corrosive environment underground. 4130 steel pipe can also be used for related high-pressure pipelines.
Automobile manufacturing: It is suitable for the production of engine crankshafts, gearbox gears, etc., to improve the power performance and reliability of automobiles.
Mechanical manufacturing: It can be used to manufacture quenched and tempered parts such as shafts, spindles, bolts, etc., and can meet the performance requirements of various mechanical parts after quenching and tempering.
Q: How do you ensure the quality of your seamless alloy steel pipes?
A: Our seamless alloy steel pipes are produced in strict accordance with international standards (such as ASTM, DIN, GB and other relevant standards, depending on the product). Starting from the purchase of raw materials, high-quality alloy steel is selected, and each batch undergoes strict chemical composition testing to ensure that the content of alloy elements meets the standard requirements. In the production process, there are advanced production processes and professional equipment, and multiple quality inspection processes are set up on the production line, including comprehensive inspection of the dimensional accuracy, appearance, mechanical properties, etc. of the pipes, and the final sampling will be carried out before the finished products leave the factory. Only fully qualified products will flow into the market.
Q: Can you provide certification documents related to product quality?
A: Of course, we can provide a complete set of quality certification documents, such as material certificates, which clearly mark the key indicators of the material composition, mechanical properties, etc. of the steel pipe; these documents can fully prove the high quality of our products, so that you can purchase without worry.
About product specifications and dimensions
Q: In addition to the existing specifications (such as common outer diameters, wall thickness dimensions, etc.), can special specifications of seamless alloy steel pipes be customized?
A: Yes, we have strong customized production capabilities. As long as you provide specific outer diameter, wall thickness, length and other special requirements (such as specific tolerance range, special surface treatment, etc.), our technical team will evaluate and arrange production to try our best to meet your personalized specifications.
Q: What is the accuracy of product dimensions?
A: We use high-precision processing equipment and strict production control processes, and have high standards for dimensional accuracy. For example, the outer diameter tolerance can generally be controlled at ±0.05mm (depending on different specifications and standards), and the wall thickness tolerance can be controlled at about ±10%, which can well meet the requirements of dimensional accuracy in most engineering installations and uses.
About product performance
Q: How does the performance of seamless alloy steel pipes perform under different temperature environments?
A: Seamless alloy steel pipes of different materials have different temperature resistance. Like the common chromium-molybdenum alloy steel pipe, it has good high-temperature strength and oxidation resistance, can work stably for a long time at high temperatures, and is often used in high-temperature and high-pressure boilers, chemical reaction devices and other scenes; and some steel pipes containing special alloy elements such as nickel have excellent low-temperature toughness, can adapt to low-temperature environments, and are suitable for low-temperature liquid transportation and other working conditions. We will recommend suitable materials according to your specific use temperature environment.
Q: How is its corrosion resistance? Can it be used in an environment with corrosive media?
A: Seamless alloy steel pipes improve corrosion resistance by adding different alloy elements. For example, adding elements such as chromium, nickel, and molybdenum can make it have good resistance in different corrosive media environments. If it is a weakly acidic environment, chromium-containing alloy steel pipes can play a better protective role; if it is in a complex environment such as highly corrosive seawater, chemical acid and alkali, we will recommend steel pipes containing a variety of corrosion-resistant alloy elements, and can provide corresponding anti-corrosion coatings and other auxiliary anti-corrosion measures according to specific circumstances.
