Quenching treatment process of medium chromium cast ball

Abstract

The invention discloses a quenching treatment process of a medium chromium cast ball and the process comprises the following steps: the medium chromium cast ball discharged from a furnace is directly filled in a charging basket to be hung to a trolley stove and tempered, the tempering temperature is 700-720 DEG C and the tempering time is 10-10.5h; and after tempering, the furnace door is opened for natural cooling. The ratio of components in the medium chromium cast ball is 1.9-2.2 percent of carbon, and the diameter of the medium chromium cast ball is over 100mm. By regulating the chemical constituents of the medium chromium cast ball and improving the technology, the process improves the toughness of products, brings down the percentage of damage of medium chromium cast balls with the diameter over 100, boosts the grinding quality of ferrous powder, reduces production cost and creates economic benefits for enterprises.

Description

Technical field: [0001] The invention relates to the field of high-temperature metal processing, in particular to a quenching process for medium chromium cast balls. Background technique: [0002] At present, when most of the mills with a diameter of more than 3.7 meters in domestic production enterprises use medium chromium casting balls above ￠100, the amount of iron and gold powder added is very small, and the temperature inside the mill is very high, so medium chromium casting balls above ￠100 are grinding When the machine is running, the mutual impact force increases obviously, which not only affects the quality of iron powder grinding, but also has a very high crushing rate. Invention content: [0003] In order to solve the problems existing in the existing technology, the carbon content in the chemical composition of the chromium casting ball above ￠100 is adjusted from 2.3-2.7 to 1.9-2.2, so as to improve the toughness of the product, and the semi-finished product ...

AI Technical Summary

Problems solved by technology

[0002] At present, when most of the mills with a diameter of more than 3.7 meters in domestic production enterprises use medium chromium casting balls above ￠100, the amount of iron and gold powder added is very small, and the temperature inside the mill is very high, so medium chromium casting balls above ￠100 are grinding When the machine is running, the mutual impact force increases obviously, which not only affects the quality of iron powder grinding, but also has a very high crushing rate.