1.The characteristics and applicable scope:

For carbon steel high strength, cold plastic deformation, welding performance, low hardenability difference, but not the temper brittleness, cutting performance can still be.Generally used in normalizing or quenching, tempering, used in the manufacture of abrasion resistance of the high demand, dynamic load and impact of machining parts has little effect and the spring pieces, such as forging gear, rod, roller, shaft, the friction disc, agricultural digging ploughshare, heavy-duty spindle etc..

2.● chemical composition:

 C:0.47 ~ 0.55     Si:0.17 ~ 0.37     Mn:0.50 ～ 0.80    S ≤ 0.035

 P ≤ 0.035            Cr ≤ 0.25              Ni ≤ 0.25                Cu ≤ 0.25
3.● the specification of heat treatment and microstructure:

Heat treatment specification: 830 ℃ normalizing, quenching, tempering; 830 ℃, 600 ℃.

Microstructure: pearlite + ferrite.

4.● delivery state: with no heat treatment or heat treatment (annealing, normalizing and tempering) delivery.Requirements for heat treatment delivery shall be specified in the contract, do not indicate that by not heat treatment delivery.
5.Dimensions: Φ12mm-Φ280mm Φ290mm –Φ1000mm  Hot rolled, Forged