SCM430 hollow rod or 4130 hollow rod is made of cold drawn seamless tubes or hollowed bars, by grinding and precision polishing on the outside diameter and then chrome plated to a certain thickness on the OD. Chrome hollow bar and chrome solid bar both very popular components for producing hydraulic cylinder.
Heat Treatment Of 4130 Hollow Rod
1.Q+T(Quenched+Tempered)
Quenching and tempering refers to the hardening (Quenching) of hollow rod materials at temperatures from 800 — 1,100 °C with a subsequent re-heating (Tempering) at temperatures from 540 — 680 °C. Hardening is a heat treatment process that comprises of austenitizing and rapid cooling. On account of the associated microstructure transformation during the cooling process, the chrome hollow steel rod is hard but also brittle. The subsequent high tempering temperature leads to an increased yield and tensile strength as well as to high elongation and toughness values.
2. Normallized (+N)
Normal annealing refers to the process of heating steel slightly above the austenite temperature. After having been thorough heated through, the material is cooled down in still air. All microstructure- and property changes on account of the quenching and tempering, hardening, overheating, welding, cold or hot formation are as such reversed; in as far as these have not led to any material damages. The aim is to obtain a uniform fine ferrite-pearlite microstructure with the associated mechanical properties.
3.Induction Hardened 4130 Hollow Chrome rod
Induction hardening is used to increase the mechanical properties of ferrous components in a specific area. Typical applications are powertrain, suspension, engine components and stampings. Induction hardening is excellent at repairing warranty claims / field failures. The primary benefits are improvements in strength, fatigue and wear resistance in a localised area without having to redesign the component.
Wuxi YUTONG as a professional chrome hollow bar and rod factory, there are various types of chrome rods/bars/shafts we have in stocks are standard hard chrome and induction hardened chromed . Other types of steel products such as nickel-chrome rod, ID honing tubing, SRB tubes are also available on request.