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Low-carbon equivalent easy-to-weld q690d steel plate for construction machinery and production method thereof

A Q690D, engineering machinery technology, applied in the field of metallurgy, can solve problems such as increasing production costs and prolonging production processes

Active Publication Date: 2022-02-11
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preheating before welding not only prolongs the production process, but also increases production costs

Method used

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  • Low-carbon equivalent easy-to-weld q690d steel plate for construction machinery and production method thereof
  • Low-carbon equivalent easy-to-weld q690d steel plate for construction machinery and production method thereof
  • Low-carbon equivalent easy-to-weld q690d steel plate for construction machinery and production method thereof

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Embodiment 1-10

[0018] The invention discloses a production method of a low-carbon equivalent and easy-to-weld Q690D steel plate for engineering machinery. The technological process mainly includes heating, rolling, quenching and tempering processes.

[0019] In the heating process, the heating temperature is 1180-1220°C, and the total heating time is >10min / mm.

[0020] In the rolling process, the first stage is the rough rolling stage, and the starting rolling temperature is 1050-1150°C; the second stage is the finishing rolling stage, the starting rolling temperature is ≤950°C, and the final rolling temperature is controlled at 800-830°C.

[0021] The quenching process adopts direct quenching after rolling, the starting cooling temperature is ≥780°C, the final cooling temperature is ≤200°C, and the cooling rate is ≥20°C / s.

[0022] In the tempering process, the tempering furnace is used for tempering, the heating temperature is 520-550°C, the heat preservation coefficient is 3-3.5min / mm, a...

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Abstract

The invention discloses a low-carbon equivalent and easy-to-weld Q690D steel plate for engineering machinery and a production method thereof, belonging to the technical field of metallurgy. The chemical composition and weight ratio of the steel plate are C: 0.06~0.08%, Si: 0.20~0.30%, Mn: 1.10~1.35%, P≤0.02%, S≤0.01%, Cr: 0.20~0.35%, Nb: 0.02~ 0.03%, Ti: 0.009~0.02%, Als: 0.02~0.04%, B: 0.0012~0.0015%, the balance is Fe and unavoidable impurities; steel plate Ceq<0.4, Pcm<0.2. The production method includes heating, rolling, direct quenching and tempering after rolling; the final cooling temperature in the quenching process is ≤200°C. Under the conditions of low carbon equivalent and low welding crack sensitivity index, the invention ensures that the strength and low-temperature toughness meet the requirements.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-carbon equivalent and easy-to-weld Q690D steel plate for engineering machinery and a production method thereof. Background technique [0002] Q690D grade high-strength steel is mainly used in the manufacture of main components of equipment such as excavation machinery, engineering hoisting machinery, mining machinery and industrial vehicles. With the development of large-scale and strengthened construction machinery, the proportion of steel with a yield strength of 690MPa or higher in construction machinery and equipment is increasing, and the requirements for high-strength steel of Q690 grade are also getting higher and higher. , not only require it to have stable mechanical properties, but also put forward higher requirements for welding performance. At present, in the production process of hydraulic supports in coal mines, Q550D has achieved no preheating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C38/32C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C38/32C21D8/0205C21D8/0226C21D8/0263
Inventor 杨浩孙电强杜琦铭陈振业王会岭赵燕青魏浩
Owner HEBEI IRON AND STEEL