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Development and Production of HSLA wear-resistant steel

Journal of Iron and steel Research International 2011年第S1期18卷 961-965页

作者： CAO Yi 1,WANG Zhao-dong 1,WU Di 1,WANG Guo-dong 1,ZHANG Ti 2 (1.State Key Lab.of Rolling and Automation,Northeastern University,Shenyang 110004,Liaoning,China 2.Nanjing Iron and steel Co.,Ltd.,Nanjing 210035,Jiangsu,China) Northeastern Univ State Key Lab Rolling & Automat Shenyang 110004 Liaoning Peoples R China Nanjing Iron & steel Co Ltd Nanjing 210035 Jiangsu Peoples R China

In this paper,the development and production of Ti-Cr-B microalloyed NM400 wear-resistant steel were discussed,along with the influence of heat treatment process parameters on the mechanical *** continuous cooling transformation behavior of steel was investigated by means of thermal *** of austenitizing temperature on microstructures and properties of steel were *** laths evolution,carbide transformation and precipitation behavior were observed by *** wear-resistance of steel was compared with other similar *** results show that the steel has high strength and hardness,great low-temperature toughness and *** tensile strength is more than 1300 MPa,and the hardness is in the range of 390-430 *** to the good hardenability,the steel has a uniform hardness distribution on the surface and thickness *** plate shape,cold bending property and weldability of the product can meet the user’s requirement.

关键词： wear-resistant steel heat treatment hardness toughness wear-resistance

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Effects of air-atomized water spray cooling device structure on the quenching process,microstructure,and properties of wear-resistant steel

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Baosteel Technical Research 2022年第2期16卷 35-41页

作者： WEN Shibo WU Jianfeng ZHU Jianhua Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999 China

With its high strength and hardness, wear-resistant steel has become an important material in the field of construction machinery *** that quenching technology is a crucial component of wear-resistant steel production, the selection of the cooling method to be used during this process is *** this study, the feasibility of quenching wear-resistant steel by air-atomized water spray cooling was studied, and the cooling rate, microstructure, and hardness of wear-resistant steel under various cooling device structures were *** results reveal that the air-atomized water spray cooling method is an effective technique in quenching wear-resistant ***, martensite and uniform hardness were obtained by the air-atomized water spray cooling *** the space between the nozzles in each row in the device increased, the cooling rate was reduced during ***, the martensite content decreased, and more carbides were observed in the martensitic structure.A mixture comprising self-tempered martensite and bainite was formed at a large distance over a longer period of *** these factors resulted in lower hardness and worse property uniformity.

关键词： wear-resistant steel air-atomized water spray cooling cooling rate microstructure hardness

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Microstructure and properties evolution of Nb-bearing medium Cr wear-resistant cast steel during heat treatment

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Journal of Iron and steel Research International 2021年第6期28卷 739-751页

作者： Jia-cheng Zhang Tuo Zhang Yi-tao Yang School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

The effect of quenching temperature and cooling conditions on the microstructure and mechanical properties of a 0.2%Nb medium chromium wear-resistant cast steel was *** microstructure,carbides and volume fraction of retained austenite were characterized using the optical microscope,scanning electron microscope,transmission electron microscope and X-ray *** influence of heat treatment on hardness,impact toughness and tensile properties of test steel was *** can be observed that lath martensite can be obtained under the condition of air cooling and oil cooling upon austenitizing in the range of 900–1020℃.Total carbide content of 0.2–1.1 wt.%under air cooling is more than that under oil cooling due to the lower cooling ***6C5,M23C6 and M7C3 were found at lower austenitizing temperature,of which niobium carbide mostly located at grain boundaries,while chromium carbides were uniformly distributed in the matrix with the size of 20–50 *** chromium carbides are basically dissolved into the matrix in test steel austenitized at 1020°***,the negligible growth of prior austenite grain size is *** austenitized at 1020℃ and cooled in air+tempered at 200℃ has a best combination of hardness,plasticity and tensile strength due to fine grain size and more amount of retained *** this condition,the hardness is 58 HRC,the impact toughness is 22.92 J/cm^(2),and the tensile strength is 1136.9 MPa.

关键词： wear-resistant steel Quenching temperature Cooling condition Carbide Retained austenite Strengthening Toughening

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