Performance Requirements (1) a high surface hardness of the carburized layer to ensure excellent wear resistance and contact fatigue resistance, and has adequate ductility and toughness. (2) central portion having high toughness and high strength enough. The heart is insufficient toughness under impact load or loads too easily broken; insufficient strength steel sheeting, are more easily broken brittle carburized layer, peel off. (3) have a good performance at high heat treatment process of carburizing temperature (900 ℃ ~ 950 ℃), the austenite grain is not easy to grow up and have a good hardenability. Heat treatment and tissue properties of the alloy hardened steel heat treatment are generally direct quenching after carburizing steel prices, then tempering. After the heat treatment, the tissue surface carburized layer alloy cementite + tempered martensite + a small amount of residual austenite steel specifications, hardness 60HRC ~ 62HRC. Heart tissue and hardenability and steel parts cross-sectional dimension is related to low-carbon hardenability completely when tempered martensite, hardness 40HRC ~ 48HRC; in most cases troostite, tempered martensite and a small amount of iron ferrite hardness 25HRC ~ 40HRC. Heart toughness are generally higher than 700KJ / m2. Steel specifications, Lu'an steel, exhibition of Commerce Bo Bo exhibition by Hefei Trading Company. Hefei Show Bo Trading Company (www.hfzhanbo.com) (www.hfzhanbo.com) strong, credible, in Hefei steel industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement will lead the development of innovative ideas of Commerce Bo into the brilliant and you work for a better future!