Quenched and Tempered Steel Round Bar
Hardened and Tempered Steel Round Bar
Hardening and tempering is a heat-treatment process for high-quality steel round bars to give them necessary properties as required. It is a two-stage heat treatment process consisting of Quenching and Tempering.
Stage 1 : Quenching / Hardening
The first stage consists of hardening, in which the round bar is austenitized to approximately 900°C depending on the grade and then quickly cooled. The material is water-quenched or oil quenched or solvent quenched in a quench unit.
Stage 2 : Tempering
It consists of tempering the material to obtain the desired material properties.
The material is then straightened. Material is tested to check if it meets requirement.
Quenching and tempering achieves an extremely fine-grained and homogeneous microstructure. They are also called QT bars. QT steel bars are characterized by high strength and good ductility.
We can provide you Quenched and Tempered Bars of grades such as SAE4140, etc.
For details contact Mr Apurv Gupta on +91 9004064570.
1. Microstructure Benefits
When heat treated correctly, 4140 steel’s tempered martensite microstructure minimises internal stresses, reducing the likelihood of unexpected warping during CNC machining or under fluctuating loads. This property is particularly valuable in industries such as aerospace and oil & gas, where component failure risk must be near zero.
2. Stability During Further Processing
Unlike many hardened steels, properly tempered 4140 remains dimensionally stable during nitriding, induction hardening, or stress relieving. This makes it a go‑to choice for precision, high‑load components that require post‑heat‑treatment surface enhancements without distortion.