High temperature resistant and abrasion resistant martensitic stainless steel and preparation method

Abstract

Disclosed is a high temperature- and abrasion-resistant martensitic stainless steel, comprising the chemical constituents (in weight percent) as follows: Cr: 12.5-14, Ni: 3.0-5.0, Cu: 4.5-6.5, Nb: 0.5-1.0, Mn: 0.5-1.0, C<=0.08, Si<=1.0, P<=0.040, S<=0.030, balance Fe. The invention also provides a manufacturing method of the high temperature- and abrasion-resistant martensitic stainless steel, which adopts an arc furnace and a vacuum induction furnace for smelting at a temperature of between 1600 and 1700DEG C, with a hot working temperature of between 1100 and 1200DEG C, and a quenching temperature of between 1060 and 1110DEG C, the oil quenching is carried out after 0.5 hour of heat preservation, the tempering temperature is between 500 and 600DEG C, and the steel is air-cooled to the room temperature after one hour of heat preservation. The stainless steel has excellent high temperature and abrasion resistance, meanwhile, the service life is also greatly extended.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a martensitic stainless steel suitable for working conditions of high temperature resistance and wear resistance. Background technique [0002] At present, most of the high-speed wire laying machines are arranged horizontally. The inclination angle of the laying machine relative to the horizontal line is about (15°~20°, different manufacturers). Shaped lower bending sleeve device to change its original straight direction, and accurately guide the wire into the laying machine to complete the spinning. Since the production of high-speed wire rods has the characteristics of high rhythm (more than 22 hours of continuous work per day), high temperature (spinning temperature above 900°C), high speed (maximum rolling speed of 110m / s), etc., the working conditions of the lower bending sleeve (Under the conditions of high temperature, high speed, and long-term friction) is poor...

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Problems solved by technology

[0003] At present, the material of the lower bending sleeve with good effect is 38CrSi, which belongs to alloy structural steel and contains 0.35-0.43wt% C, 1.00-1.30wt% Si, 0.3-0.6wt% Mn and 1.3-1.6wt% Cr. Metallographic microstructure such as figure 1 As shown, the hardness aged at 500°C after quenching is HRC35; due to the low amount of alloying elements contained in the alloy, especially the low content of elements that improve the red hardness of the alloy, the softening resistance of the alloy at high temperatures is weak, resulting in High-temperature hardness drops quickly, high-temperature wear resistance is not high, and the service life is low (average service life 1.5 hours), which cannot well meet the actual needs of the site

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