A519 Grade 4140 Chrome Moly Tubes from Hanko Steel, Japan

When industries demand strong, reliable tubing for high stress applications, alloy steels like 4140 often rise to the challenge. In Japan, Hanko Steel has built a reputation for supplying top quality chrome moly tubes under the ASTM A519 designation, with the tubes made from AISI 4140 alloy. These ASTM A519 Grade 4140 Chrome Moly tube in Japan, combine strength, toughness and versatility — making them a go to choice for engineering, automotive, hydraulic and structural work.
Properties and Composition of A519 Grade 4140 Chrome Moly Tubes
AISI 4140 is a medium carbon alloy steel that includes chromium and molybdenum among its alloying elements. Typical chemical composition ranges include around 0.38–0.43% carbon, 0.75–1.00% manganese, 0.15–0.30% silicon, 0.80–1.10% chromium, and 0.15–0.25% molybdenum (with trace sulphur and phosphorus). This combination of elements gives 4140 steel a balance of hardenability, strength and ductility.
Mechanically, A519 4140 tubes show strong performance. Tensile strength typically reaches about 655 MPa (≈ 95,000 psi), and yield strength about 415 MPa (≈ 60,200 psi). Elongation at break is around 25%, and hardness (Brinell) around 197 HB. Because of heat-treatment and alloy composition, 4140 tubes deliver good resistance to fatigue, wear and shock loading — which is why they’re commonly used in demanding environments.
The standard covering these tubes — ASTM A519 — allows for both hot finished seamless and cold finished mechanical tubing. Tubes may be round, square, rectangular or even special profiles in some cases. Outside diameters generally go up to about 12.75 inches, with wall thickness and length varying based on customer needs
Why Hanko Steel’s Offering Matters
Hanko Steel — a recognized name in Japan’s steel supply sector — includes A519 Grade 4140 Chrome Moly tube in Japan, as part of their product lineup. Their tubes are available in both seamless and welded (ERW, EFW) forms, and in either hot finished or cold drawn finishes depending on requirements. Such variety gives clients flexibility depending on end use — for example, seamless hot finished tubes for heavy duty pressure applications, or cold drawn tubes when tighter tolerances are needed.
According to Hanko Steel, their chrome moly pipes are designed to offer high tensile strength, good heat resistance, and improved resistance to corrosion and oxidation under heat — features especially valuable in power generation, pressure vessel manufacturing, heavy equipment, and hydraulic cylinder applications.
Additionally, because 4140 alloy can be heat treated, tempered or quenched, Hanko Steel can offer tubes tuned for hardness, toughness or ductility depending on customer needs. That versatility, combined with strict adherence to ASTM A519 standards, ensures that engineers and fabricators can rely on consistency and performance.
Conclusion
A519 Grade 4140 Chrome Moly tubes from Hanko Steel offer a solid mix of strength, toughness, and adaptability — thanks to the alloy composition of AISI 4140 and careful manufacturing practices. Whether you need seamless or welded tubes, hot finished or cold drawn, Hanko Steel’s range caters to many industrial needs. For engineers and fabricators in Japan (or abroad) looking for dependable mechanical tubing for heavy duty use, these 4140 chrome moly tubes are a strong choice.
For more info CLICK HERE:-https://www.hankosteel.com/chrome-moly-tubes.html