After the quenching and tempering treatment of seamless pipes, the parts produced have good comprehensive mechanical properties and are widely used in various important structural parts, surtout ces bielles, boulons, engrenages et arbres qui fonctionnent sous des charges alternées. Mais la dureté de surface est faible et non résistante à l'usure. Trempe + la trempe superficielle peut être utilisée pour améliorer la dureté de surface des pièces.
Its chemical composition contains carbon (C) content of 0.42~0.50%, Si content of 0.17~0.37%, Mn content of 0.50~0.80%, and Cr content<=0.25%.
Recommended heat treatment temperature: normalizing 850°C, quenching 840°C, tempering 600°C.
Common seamless steel pipes are generally made of high-quality carbon structural steel, which is not very hard and easy to cut. It is often used in molds to make templates, tips, guide posts, etc., but heat treatment is required.
1. After quenching and before tempering, the hardness of the steel is greater than HRC55, which is qualified.
The highest hardness for practical application is HRC55 (high frequency quenching HRC58).
2. Do not use the heat treatment process of carburizing and quenching for steel.
Après trempe et revenu, the parts have good comprehensive mechanical properties and are widely used in various important structural parts, surtout ces bielles, boulons, engrenages et arbres qui fonctionnent sous des charges alternées. Mais la dureté de surface est faible et non résistante à l'usure. Trempe + la trempe superficielle peut être utilisée pour améliorer la dureté de surface des pièces.
Carburizing treatment is generally used for heavy-duty parts with wear-resistant surface and impact-resistant core, et sa résistance à l'usure est supérieure à la trempe et au revenu + trempe superficielle. La teneur en carbone à la surface est 0.8-1.2%, et le noyau est généralement 0.1-0.25% (0.35% est utilisé dans des cas particuliers). Après traitement thermique, the surface can obtain very high hardness (HRC58–62), and the core has low hardness and impact resistance.