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Ultrahigh-strength engineering machinery steel Q890D and production method thereof

A technology of engineering machinery and production methods, which is applied in the fields of iron and steel metallurgy and rolling, can solve the problems of high process costs and high selling prices, and achieve the effects of shortening the production process, reducing production costs, and satisfying mechanical properties

Active Publication Date: 2020-11-17
HANDAN IRON & STEEL GROUP +1
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  • Application Information

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Problems solved by technology

[0003] At present, domestic high-strength steel manufacturers mainly import high-strength steel of 890MPa grade, which is expensive, and its production process is mostly offline quenching and tempering process; domestic manufacturers with production capacity of such products also mainly use offline quenching + tempering Quenching and tempering process for product production, the process cost is relatively high

Method used

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  • Ultrahigh-strength engineering machinery steel Q890D and production method thereof
  • Ultrahigh-strength engineering machinery steel Q890D and production method thereof
  • Ultrahigh-strength engineering machinery steel Q890D and production method thereof

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with specific embodiments.

[0026] A production method of Q890D, an ultra-high-strength engineering machinery steel, comprising slab heating, controlled rolling, DQ on-line quenching+ACC rapid cooling, and tempering heat treatment, specifically as follows:

[0027] (1) Slab heating: the slab is heated in a walking furnace, the surface temperature at the end of the slab heating is controlled within the range of 1150-1250°C, and the heating time is controlled within 4-5 hours.

[0028] (2) Controlled rolling: CR rolling is adopted, the starting rolling temperature is 1080-1100°C; the final rolling temperature of the first stage is ≥980°C, the starting rolling temperature of the second stage is ≤950°C, and the cumulative reduction ratio of finishing rolling is ≥66 %, the final rolling temperature is 840~880℃.

[0029] (3) On-line quenching treatment: DQ+ACC method is adopted. After the steel p...

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Abstract

The invention discloses ultrahigh-strength engineering machinery steel Q890D and a production method thereof. A steel plate comprises the following components in percentage by mass: 0.07-0.09% of C, 1.10-1.30% of Mn, 0.015-0.035% of Nb, 0.015-0.025% of Ti, 0.30-0.40% of Cr, 0.50-0.60% of Mo, 0.0008-0.0015% of B, no less than 0.015% of Als, and the balance Fe as well as inevitable residual elementsand impurities in the production process; and the online quenching and tempering production technology is adopted in the production process. The mechanical properties of the Q890D steel plate provided by the invention meet the GB / T 16270-2009 requirements, and the low-cost production of such steel is achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and rolling, and in particular relates to an ultra-high-strength engineering machinery steel Q890D and a production method thereof. Background technique [0002] Ultra-high-strength construction machinery steel Q890D is the steel grade with the second highest strength in GB / T16270-2009, and is mainly used in construction machinery fields such as excavators, cranes, port booms, and hydraulic supports. [0003] At present, domestic high-strength steel manufacturers mainly import high-strength steel of 890MPa grade, which is expensive, and its production process is mostly offline quenching and tempering process; domestic manufacturers with production capacity of such products also mainly use offline quenching + tempering The quenching and tempering process is used for product production, and the process cost is relatively high. [0004] Due to the limitation of the processing capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/28C22C38/26C22C38/22C22C38/32C22C38/06C21D8/02C21D1/18
CPCC22C38/04C22C38/28C22C38/26C22C38/22C22C38/32C22C38/06C21D8/0226C21D1/18C21D2211/002C21D2211/004Y02P10/20
Inventor 李玉谦杨雄杜琦铭刘红艳梅东贵冯俊鹏谢浩
Owner HANDAN IRON & STEEL GROUP
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