Production process of composite steel for tools

Abstract

The invention relates to a method for manufacturing composite steel for cutting tools. (1) firstly perform surface deoxidation and decontamination treatment on the cutting edge steel with a carbon content of more than 0.5% and matrix steel; (2) combine the cutting edge steel and the matrix After the steel is stacked, weld the surrounding edges, and set 2 to 6 reserved vent holes at the rear end of the rolling direction to make a billet; Raise the temperature and heat it to 1050°C-1200°C in a protective atmosphere, carry out multiple directional rolling on the billet, the first two pass reduction rate is 40%-55%, and make a composite steel; (4) Stress relief annealing deal with. By controlling the heating temperature and speed of the two metal blanks, the invention can make the composite interface of the two metals bonded stably after high-temperature hot rolling of the two solid-phase metals, with clear composite interface, material cross-section combination size and steel ratio accuracy High, high yield, does not reduce the mechanical properties of cutting edge steel, and is easy to industrialized production.

Description

technical field [0001] The invention relates to a manufacturing method of knife steel, in particular to a manufacturing method of knife composite steel composed of two or more metals with different carbon contents. Background technique [0002] High-carbon steel composite steel is the most ideal raw material for the knife and scissors industry. At present, there are two ways to manufacture high-carbon steel composite steel in China: one is the explosive forming method; the second is the casting composite method. The explosive forming method is a solid phase composite method, which is especially suitable for large-area composites of high and low carbon steels and composite steels that are difficult or impossible to produce by other methods, such as those with large differences in melting point, thermal expansion coefficient and hardness. Metal welding. However, the disadvantage is that the explosive forming method is not easy to control the impact force when the explosive e...

AI Technical Summary

Problems solved by technology

However, due to the different melting points of the composite metal and the metal of the body, and the temperature of the body metal in the liquid phase is relatively high, generally above 1500 ° C, on the one hand, it is easy to cause melting loss at the junction of the two metals during casting, and oxidation is prone to occur at the composite interface

On the other hand, when the two metals are melted and compounded at high temperature, the carbon atoms in the high-carbon steel diffuse violently to the low-carbon steel, resulting in a decrease in the carbon content of the edge steel, which not only affects the mechanical properties of the edge steel, but also A wide thermal-hard transition layer is also formed on the composite interface, causing the composite interface to be unclear

Secondly, liquid-solid phase composite also has a series of problems such as dust inclusion, air inclusion, poor reworkability, low accuracy of material section combination size and steel ratio, and poor uniformity at the composite interface. Therefore, it is difficult to obtain high-quality composite steel.

Furthermore, liquid-solid phase compounding is used, and the manufacturing process is relatively complicated.