Product brief introduction
GB/T 700-2006 Standard of carbon structural steel Q235 by metallurgical quality is divided into A, B, C, D four grades, steel chemical composition for each level
Q235A Contains C ≤0.22% Mn ≤1.4% Si ≤0.35% S ≤0.050 P ≤0.045
Q235B Contains C ≤0.20% Mn ≤1.4% Si ≤0.35% S ≤0.045 P ≤0.045
Q235C Contains C ≤0.17% Mn ≤1.4% Si ≤0.35% S ≤0.040 P ≤0.040
Q235D Contains C ≤0.17% Mn ≤1.4% Si ≤0.35% S ≤0.035 P ≤0.035
There are a number of domestic application of low carbon martensite was strongly quenching process manufacturing cold instance for the mold.
Using the double glow ion permeability metal technology, in the steel surface Mo - Cr altogether permeability, then super saturated carburizing, quenching and tempering of composite processing, Mo - Cr = 100 microns in devoting to layer thickness, surface Mo content can reach 20%, Cr content is 10%, the super saturated carburizing surface carbon content more than 2.0%, surface composition close to molybdenum high speed steel, surface after quenching and tempering hardness up to 1300 hv, than general metallurgy high speed steel.
Wear test showed that the friction coefficient increases with the increase of contact stress, the average relative wear resistance is 2.2 times of GCr15 carburizing and quenching steel.