Heat treatment quenching technology for high-carbon chromium-molybdenum-vanadium powder hubbing steel precise parts

Abstract

The invention discloses a heat treatment quenching technology for high-carbon chromium-molybdenum-vanadium powder hubbing steel precise parts. The technology comprises the following steps that 1, workpieces with the average thickness being 32 mm are put into a quenching furnace to be preheated twice to reach the temperature being 150 DEG C; 2, heating is conducted in the quenching furnace in two stages to reach the quenching temperature being 1,018 DEG C, and heat preservation is conducted; 3, the workpieces are subjected to discharge and air cooling till the temperature is 65 DEG C; 4, the workpieces are put into a tempering furnace twice, heat preservation and tempering are conducted at 510 DEG C, and discharge and air cooling are conducted. The workpieces with the average thickness being 32 mm are put into the quenching furnace to be preheated twice, for the first time, the temperature is raised to 100 DEG C at the heating speed smaller than 75 DEG C / hour, and for the second time, the temperature is raised to 150 DEG C at the heating speed smaller than 115 DEG C / hour. Accordingly, the excellent performances such as the extremely high abrasive wear resistance and high pressure resistance strength, good toughness and good size stability of heat treatment of the precise parts are reliably guaranteed, and the use requirements of the precise parts are met.

Description

【Technical field】 [0001] The invention belongs to the field of heat treatment of die steel materials, and in particular relates to a heat treatment and quenching process for high-carbon chromium molybdenum vanadium powder die steel precision parts. 【Background technique】 [0002] With the upgrading of my country's manufacturing industry, some precision equipment has more and more stringent requirements for parts and components. Domestic materials cannot meet their requirements in some aspects of performance, so relevant advanced imported materials have to be used, especially those from Germany, Sweden and other countries. Pure steel has excellent qualities such as pure, high grain refinement and uniform structure. The import volume has been increasing in recent years, but the heat treatment level is not suitable for it, and it is difficult to exert its performance, resulting in huge waste. Some suppliers have to set up domestic steel. It is not only difficult for a specialized...

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Problems solved by technology

[0002] With the upgrading of my country's manufacturing industry, some precision equipment has more and more stringent requirements for parts and components. Domestic materials cannot meet their requirements in some aspects of performance, so relevant advanced imported materials have to be used, especially those from Germany, Sweden and other countries. Pure steel has excellent qualities such as pure, high grain refinement and uniform structure. The import volume has been increasing in recent years, but the heat treatment level is not suitable for it, and it is difficult to exert its performance, resulting in huge waste. Some suppliers have to set up domestic steel. It is not only difficult to meet the individual requirements of a dedicated heat treatment service factory, but also cause a huge increase in cost

[0003] ASSAB VANADIS-10 is a Swedish brand, and its main alloy composition is 2.9%C 8.0%Cr 1.0%Si1.5%Mo 9.8%V. It is a powder high-speed steel with extremely high abrasive wear resistance and high resistance to heat treatment. Compressive strength, excellent overall hardenability, good toughness, dimensional stability of heat treatment, excellent temper softening resistance, especially suitable for long-life production of molds where abrasive wear is the main failure mode. VANADIS-10 combines extremely High wear resistance and toughness, often used to replace cemented carbide (tungsten carbide) materials that have chipping or cracking in practical applications, the commonly used quenching temperature is 1200 °C, hardness HRC56-HRC64; powder metallurgy materials have poor thermal conductivity, alloy The composition also has a great influence on the heat treatment process, which leads to complex heat treatment process. If the heat treatment is improper, it will not only make it difficult to exert its excellent performance, but also difficult to control the quality, and it is easy to scrap in batches

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