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Quenching method for 20Cr13-40Cr13 martensite stainless steel

A martensitic stainless steel and quenching tank technology, applied in the field of metal heat treatment, can solve the problems of lack of quenching speed, workpiece explosion, insufficient oil quenching cooling speed, etc., and achieve the effect of eliminating the hidden danger of fire and oil fume pollution.

Active Publication Date: 2012-03-28
FUSHUN SPECIAL STEEL SHARES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same stirring speed (5.67m s -1 ), the highest values ​​of the average heat transfer coefficients of the water and oil quenching media used most at present are 12000W respectively m -2 ·K -1 and 6500W m -2 ·K -1 (Kang Datao, Ye Guobin. "Materials and Heat Treatment of Large Forgings" [M]. Beijing: Longmen Bookstore, 1998: 397.), but water quenching has the risk of cracking the workpiece due to too fast cooling rate in the low temperature stage, while oil quenching has the risk of Insufficient cooling rate at the high temperature stage, large fire risk and environmental pollution caused by oil fumes, etc. Therefore, for 20Cr13-40Cr13 martensitic stainless steel with high hardenability and hardenability, there is currently a lack of appropriate methods to meet the quenching rate

Method used

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  • Quenching method for 20Cr13-40Cr13 martensite stainless steel
  • Quenching method for 20Cr13-40Cr13 martensite stainless steel
  • Quenching method for 20Cr13-40Cr13 martensite stainless steel

Examples

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Effect test

Embodiment 1

[0028] 20Cr13 flat steel, the size is 40mm in thickness, 40mm in width, and 8.0m in length. Such as figure 2 As shown, the steel is heated with gas in a continuous roller hearth heating furnace, the furnace temperature is ≤200°C, the heating rate is ≤100°C / h, and it is heated to 970°C for austenitization and heat preservation for 1.5 hours; after the heat preservation is completed, the material is quickly discharged , enter the roller hearth quenching tank for water-air-controlled quenching (immersion solution 38S→air cooling 73S→immersion solution 31S), after the steel is air-cooled to below 155°C, enter the electric heating continuous roller hearth furnace for tempering, the tempering temperature 501°C for 8 hours; the hardness of the tempered steel reaches 33±1HRC, and the bending degree is not greater than 2.5mm / m. Pre-hardened 20Cr13 flat steel is used for moving blades.

Embodiment 2

[0030] 20Cr13 flat steel, the size is 90mm in thickness, 305mm in width, and 5.0m in length. Such as image 3 As shown, the steel is heated with gas in a continuous roller hearth heating furnace, the furnace temperature is ≤200°C, the heating rate is ≤100°C / h, and it is heated to 970°C for austenitization and heat preservation for 3 hours; after the heat preservation is completed, the material is quickly discharged , into the roller bottom quenching tank for water-air quenching (air cooling 48S→immersion liquid 38S→air cooling 88S→immersion liquid 53S→air cooling 92S→immersion liquid 34S→air cooling 72S→immersion liquid 36S→air cooling 60S→immersion liquid 20S ) after treatment, the steel is air-cooled to below 174°C and entered into an electric heating continuous roller hearth furnace for tempering at a tempering temperature of 504°C for 8 hours; the hardness of the tempered steel reaches 33±1HRC, and the bending degree is not greater than 2.5mm / m. Pre-hardened 20Cr13 flat s...

Embodiment 3

[0032] Y30Cr13 flat steel, the size is 40mm in thickness, 305mm in width, and 6.0m in length. Such as Figure 4 As shown, the steel is heated with gas in a continuous roller hearth heating furnace, the furnace temperature is ≤200°C, the heating rate is ≤100°C / h, and it is heated to 970°C for austenitization and heat preservation for 1.5 hours; after the heat preservation is completed, the material is quickly discharged , into the roller hearth quenching tank for water-air-controlled quenching (immersion liquid 38S→air cooling 73S→immersion liquid 28S) treatment, the steel is air-cooled to below 168°C and enters the electric heating continuous roller hearth furnace for tempering, tempering temperature 524°C for 8 hours; the hardness of the tempered steel reaches 34±1HRC, and the bending degree is not more than 2.5mm / m. Pre-hardened Y30Cr13 flat steel is used in hydraulic valve blocks.

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Abstract

The invention discloses a quenching method for 20Cr13-40Cr13 martensite stainless steel, in which water and air are used for carrying out continuous quenching and realizing industrialized production. The quenching method is realized through the following technical schemes: selecting a 5.0-8.0m overlong workpiece of 20Cr13-40Cr13 martensite stainless steel; rapidly putting the workpiece into a roller hearth type quenching tank after carrying out austenitization in a continuous roller hearth furnace; carrying out discontinuous water quenching and air cooling according to the chemical compositions and the specification of the product; and putting the workpiece into an electric heating continuous roller hearth furnace to carry out tempering after martensite transformation. The quenching method has the following advantages that: discontinuous water quenching is adopted, so that the workpiece cooling speed is improved and effectively controlled, the quenched structures are uniform, the quenching hardness is uniform, the quenching state hardness deviation is controlled within + / -2HRC, the tempering state hardness deviation is controlled within + / -1.5HRC and excellent use performance is provided; and water is used as a quenching agent, so that the hidden dangers such as fires and lampblack pollution in the oil quenching process are eliminated and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and specifically discloses a quenching method for 20Cr13-40Cr13 martensitic stainless steel. Background technique [0002] Pre-hardened 20Cr13-40Cr13 martensitic stainless steel is a high-alloy steel product developed in the past 10 years. The main grades include 20Cr13, 30Cr13, Y30Cr13 and 40Cr13. Pre-hardened 20Cr13-40Cr13 chromium stainless steel can control the hardness within the range of 30-40HRC according to the requirements of use. At present, the main process method is that the steel is austenitized and heated, then oil-quenched to obtain martensite structure, and tempered at a higher temperature to keep its hardness in the range of 30-40HRC, and then mechanically processed, directly after processing use. The pre-hardening treatment can avoid the deformation of the workpiece after quenching after machining, and improve the surface quality of the workpiece. Using "Medium a...

Claims

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Application Information

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IPC IPC(8): C21D1/22
Inventor 康爱军刘振天王继红张丽娜刘宝石杨天亮赵连泽杨洪文冯淑玲耿振伟巴俊波曹丽红
Owner FUSHUN SPECIAL STEEL SHARES
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