24 July 2021 Free-Cutting Steel Bar
Y45Ca Free Cutting Steel Bar
Y45Ca is easy-cutting structural steel, excellent cutting performance, suitable for high-speed machining.
Product Features and Scope: Excellent cutting performance, suitable for high-speed machining, the normal processing, the processing speed up to 150m / min or more than 45 steel to improve the cutting speed more than doubled. After heat treatment with good mechanical properties, generally used to make more important parts, such as gear shaft, spline shaft and tractor drive shaft, etc., are also commonly used in automatic machine cutting high-strength standard parts such as bolts, nuts
Chemical composition (mass fraction) /%:
- Carbon C (%): 0.42 to 0.50 "
- Silicon Si (%): 0.20 to 0.40
- Manganese Mn (%): 0.60 to 0.90
- Sulfur (%): 0.04 to 0.08
- Phosphorus P (%): ≤0.04
- Chromium Cr (%): Allowable residual content ≤ 0.025
- Nickel Ni (%): Allowable residual content ≤ 0.025
- Copper Cu (%): allow residual content ≤ 0.025; thermal processing, ≤ 0.20
- Calcium Ca (%): 0.002 to 0.006 (allowable deviation, +0.002, -0.0005)
Mechanical properties of products:
Tensile strength σb (Mpa): (hot-rolled) 600 ~ 745; (cold-drawn)
Thickness or diameter of steel:
8 to 20 hours: 695 to 920;
> 20 to 30 hours: 655 to 855;
> 30 hours: 635 to 835 ;
Yield strength σs (Mpa): 355
Elongation δ5 (%):
(hot rolled) ≥12;
(cold rolled)≥6.0;
(heat treated)> 16 in diameter: ≥16
Section shrinkage ψ (%):
(hot-rolled): ≥ 26;
(heat treatment): ≥ 40
Impact energy: ≥39
Hardness:
(hot-rolled) ≤ 241HB;
(cold-drawn) 196 ~ 255HB
Delivery Status:
Hot-rolled or cold-drawn state delivery, delivery status should be specified in the contract.
Product heat treatment specifications and microstructure:
Heat treatment specifications:
1) tensile specimen blank (φ25) normalizing 830 ~ 850 ℃, heat 30min.
2) impact specimen blank (φ15) quenching and tempering, quenching 840 ± 20 ℃, water cooling, tempering recommended 600 ℃.