Nodular cast iron and method for manufacturing hammer and liner plate through nodular cast iron

Abstract

The invention discloses nodular cast iron and a method for manufacturing a hammer and a liner plate through the nodular cast iron. The nodular cast iron includes, by weight percentage, 3.6%-3.9% of C, 2.4%-2.9% of Si, 2%-3% of Mn, 0.1%-0.3% of Mo, 0.1%-0.3% of Cu, smaller than or equal to 0.05% of S, smaller than or equal to 0.05% of P, smaller than or equal to 0.3% of Cr and the balance Fe. The hammer used for mine breaking and the inner liner plate of a grinding machine are made of nodular cast iron materials so as to have the beneficial effects that the toughness is good and not prone to break, in addition, very high work hardening performance is achieved, and the longer the hammer and the inner liner plate are used, the harder the hammer and the inner liner plate become, and high-manganese steel materials and high-chromium cast materials can be completely replaced. By means of the nodular cast iron and the method for manufacturing the hammer and the liner plate through the nodular cast iron, macromolecule quenching liquid is adopted for a heat treatment quenching medium, oil quenching pollution is avoided, and energy conservation and environment friendliness are achieved; a quenching-tempering production line is adopted for quenching equipment, and automatic control in the whole process is achieved; inoculation is completed by three times, and it is ensured that the nodulizing effect reaches the second level to the third level; and the microelements of Mo and Cu are added, the hardenability is improved, and the core hardness is ensured. The HRC of the products reaches 58 or higher and reaches the hardness of high alloy materials, and the impact toughness ak value reaches 18 J / cm<2> or higher.

Description

technical field [0001] The invention relates to the technical field of wear-resistant castings, in particular to a nodular cast iron and a method for making a hammer head and a liner from the nodular cast iron. Background technique [0002] The existing mine crushing hammers and mill liners have been produced with high-alloy materials. Although the wear resistance can be guaranteed, the crushing rate is high and the cost is also high. Ductile iron grinding balls (ADI) have been used It has been widely promoted and applied in the market, and has shown superior performance in large mills and wet grinding conditions. The matrix of this material is a matrix mainly composed of austenite and bainite obtained after quenching. This matrix It has strong toughness, but also has the function of work hardening, and does not need to add a large amount of alloying elements. The present invention intends to use this material to replace hammerheads and lining plates made of high manganese ...

AI Technical Summary

Problems solved by technology

[0002] The existing mine crushing hammers and mill liners have been produced with high-alloy materials. Although the wear resistance can be guaranteed, the crushing rate is high and the cost is also high. Ductile iron grinding balls (ADI) have been used It has been widely promoted and applied in the market, and has shown superior performance in large mills and wet grinding conditions. The matrix of this material is a matrix mainly composed of austenite and bainite obtained after quenching. This matrix It has strong toughness, but also has the function of work hardening, and does not need to add a large amount of alloying elements