Hardness and toughness of the method

The present invention belongs to the field book mixture of metal powder and nonmetal powder, particularly to seed while increasing (Cr, Fe) C hardness and toughness comprising the steps of: (1) use of scrap, pig iron, high carbon ferrochrome, low carbon chromium tungsten, iron and iron as raw materials, the weight percentage of components is as follows: 4.2% -4.8% C, 11.5% -12.3% Cr, 0.08% -0.13% Ti, 1-1.6% Si, W content of ≤3.5%, the remainder being of Fe; (2) step 1 in each raw material was melted, the molten metal reached a temperature of 1450-1500 deg.] C with aluminum wire deoxygenated, and then the molten metal by a ladle and cast into a sand natural cooling; (3) step 2 clean castings prepared, and then quenching the casting process, then cooled; (4) a tempering treatment after the casting step 3 the quenched and incubated for a predetermined time, then air cooled. The present invention can significantly improve the mechanical properties of the high chromium cast iron (Cr, Fe) 7C3 carbide, simple and easy process, the method overcomes the modification improved shape and distribution of the primary carbides only rely on conventional, suitable for mass production.