High-strength and high-toughness alloy tool steel wire rod and manufacturing method thereof

Abstract

The invention discloses a high-strength and high-toughness alloy tool steel wire. The high-strength and high-toughness alloy tool steel wire further comprises the following chemical elements in percentage by mass besides Fe: 0.60-0.90 wt% of C, 1.00-3.00 wt% of Si, 0.45-1.00 wt% of Mn, 0.45-1.00 wt% of Cr, 0.20-0.60 wt% of Mo and the balance of Fe. Wherein the microstructure of the high-strength and high-toughness alloy tool steel wire is tempered martensite and dispersedly distributed spherical carbides. In addition, the invention further discloses a manufacturing method of the high-strength and high-toughness alloy tool steel wire rod, which comprises the following steps of: (1) smelting, casting and rolling into a wire rod; (2) off-line spheroidizing annealing; (3) after a wire rod is manufactured through a machining procedure, quenching and tempering heat treatment is conducted, specifically, the wire rod is heated to the austenitizing temperature of 820-960 DEG C, heat preservation is conducted for 0.5-1 h, and quenching cooling is conducted to the room temperature at the speed of 1-50 DEG C/s; and heating to 200-400 DEG C again, tempering, and keeping the temperature for 0.5-3 hours. The high-strength and high-toughness alloy tool steel wire has excellent torsional fracture resistance and can be effectively applied to the field of hardware tools.

Description

technical field [0001] The invention relates to a metal material and a manufacturing method thereof, in particular to an alloy tool steel wire rod and a manufacturing method thereof. Background technique [0002] Tool steel is a general term for high-quality steel used in various tools, cutting tools and measuring tools that require high hardness, toughness and wear resistance. According to the alloy composition, tool steel can be divided into three categories: carbon tool steel, alloy tool steel and high-speed tool steel. Based on the working conditions of tool steel, it is generally required to have the following characteristics: (1) high hardness and good wear resistance at the service temperature; (2) good heat treatment performance, not easy to cause quenching cracking, and good tempering stability; ( 3) It has certain toughness, impact resistance, torsional or bending load and other properties; (4) It has certain special properties such as corrosion resistance and red...

AI Technical Summary

Problems solved by technology

[0010] The publication number is CN107419175A, and the publication date is December 1, 2017. The Chinese patent document titled "Economic tool steel with good fatigue life and its production method" discloses a production method of economical tool steel with good fatigue life , the alloy composition of the material is: C: 0.75-1.00%, Si: 0.15-0.35%, Mn: 0.50-1.20%, Cr: 0.30-1.10%, V: 0.05-0.20%, Alt≤0.040%, P≤0.020 %, S≤0.010%, N≤0.006%, uniform granular pearlite structure is obtained after hot rolling and annealing, and fine tempered martensite structure is obtained after quenching and tempering. This production method greatly shortens the manufacturing cycle and reduces Manufacturing cost, but the rolling process is only applicable to plates, and the alloy composition does not contain Mo element, and the hardenability is poor

Images