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Low-temperature steel for engineering machinery and production method thereof

A technology for mechanical steel and low-temperature engineering, applied in the direction of temperature control, etc., can solve the problems of difficulty in ensuring the low-temperature impact toughness and welding performance of materials, poor control and rolling effect, and difficulty in ensuring the requirements of plate shape, etc., and achieve good industrial implementation. Feasibility, excellent low temperature impact toughness, the effect of ensuring the quality of the shape

Inactive Publication Date: 2012-04-11
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the patented technology related to the production method of 600MPa and 700MPa high-strength steel for construction machinery, such as patent application No. The low temperature impact toughness of the material is not intentionally controlled and elaborated, and it is difficult to guarantee the welding performance of the material
Patent application number 201010237136.6 introduces a production method of 600MPa high-strength steel by hot continuous rolling. The disadvantage is that it is difficult to guarantee the mechanical properties of the hot zone when welding with large input energy
Patent application No. 200910010662.6 introduces a production method of 600MPa high-strength steel based on Ti strengthening. The strength is increased by adding a small amount of B. However, the patent uses a high rolling temperature, which results in poor rolling control and low-temperature impact toughness is difficult to guarantee. , while not testing and describing the welding performance of the material
Among the patents related to the production method of 700MPa high-strength steel, for example, patent application number 200910083635.1 introduces a method of producing high-strength steel with a yield strength of 700MPa by Nb-Ti-V microalloying. Low temperature impact toughness and weldability
[0007] (1) The welding performance of the material is ignored in the chemical composition design and production process design, especially under the condition of large input energy welding, it is difficult to guarantee the performance of the material to meet the standard requirements of the base metal, resulting in potential safety hazards;
[0008] (2) The low-temperature impact toughness of the material is not strictly controlled from the perspective of controlling the production process, such as the transverse low-temperature impact toughness of the material is difficult to meet the requirements of D-grade steel plates;
[0009] (3) The shape quality of the high-strength steel flat plate is not controlled by technological means, and it is difficult for the steel plate to guarantee the shape requirements of the user after blanking during use

Method used

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  • Low-temperature steel for engineering machinery and production method thereof
  • Low-temperature steel for engineering machinery and production method thereof
  • Low-temperature steel for engineering machinery and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0046] The specific method of producing 600MPa high-strength engineering machinery steel is as follows: continuous casting of molten steel smelted in a 220-ton converter and refined outside the furnace into billets, rolling in a 2250 hot continuous rolling production line at a heating temperature of 1200-1220 °C, The entrance temperature of finish rolling is 960℃~1000℃, the thickness of intermediate billet is 42mm~54mm, the temperature of final rolling is 810℃~830℃, after rolling, it is cooled to the target coiling temperature of 590℃ by laminar cooling, and bell annealing is carried out after coiling Remove residual stress. The chemical composition of steel produced by the present invention and contrast steel, mechanical property and weldability contrast situation are as shown in table 1:

[0047] Table 1 Chemical composition of 600MPa high-strength steel

[0048]

[0049] Table 2 Mechanical properties of base metal of 600MPa grade high strength steel plate

[0050]

...

Embodiment 2

[0055] The specific method of producing 700MPa high-strength engineering machinery steel is as follows: continuous casting of molten steel smelted in a 220-ton converter and refined outside the furnace into slabs, rolling on a 2250 hot continuous rolling production line at a heating temperature of 1200-1220 °C, The entrance temperature of finish rolling is 960℃~1000℃, the thickness of intermediate billet is 42mm~54mm, the temperature of final rolling is 810℃~830℃, after rolling, it is cooled to the target coiling temperature of 590℃ by laminar cooling, and bell annealing is carried out after coiling Remove residual stress. The chemical composition of steel produced by the present invention and contrast steel, mechanical property and weldability contrast situation are as shown in table 1:

[0056] Table 4 Chemical composition of 700MPa high strength steel plate

[0057]

[0058] Table 5 Mechanical properties and welding properties of 700MPa high-strength steel plates

[00...

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Abstract

The invention relates to low-temperature steel for engineering machinery and a production method thereof. The steel is suitable for higher heat input welding and comprises the following chemical components by weight percent: 0.06-0.08% of C, 0.15-0.25% of Si, 1.6-1.9% of Mn, 0.05-0.07% of Nb, 0-0.30% of Mo, 0-0.0020% of B, 0.08-0.14% of Ti, 0.01-0.06% of Al, not more than 0.02% of P, not more than 0.010% of S, not more than 0.008% of N and the balance of Fe and inevitable impurities. The production method is characterized by controlling the heating temperature, precision rolling inlet temperature, finish rolling temperature, finished cooling temperature and annealing temperature. The material can ensure the transverse universal coiling impact energy at minus 20 DEG C to be more than 47J, and meanwhile, the HAZ (heat affected zone) strength and toughness of the steel plate can meet the mechanical property requirements of the base metal under 20KJ / cm welding property energy.

Description

technical field [0001] The invention belongs to the technical field of steel material production, and relates to steel for low-temperature construction machinery and a production method thereof, in particular to steel for low-temperature construction machinery with a yield strength of 600MPa and 700MPa and a production method thereof. By strictly controlling the rolling process, the base metal has excellent strength and toughness matching, and the material can maintain high strength, low temperature impact toughness and cold bending performance under the condition of large input energy welding. Background technique [0002] 600MPa and 700MPa construction machinery steels have been widely used in the manufacture of automobile crane booms and concrete pump truck arms. More and more stringent requirements have been put forward. For example, the 700MPa D-grade steel plate requires the yield strength of the base metal to be greater than 700MPa, while ensuring that the impact ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14B21B37/74
Inventor 潘辉张鹏程李永东李飞董现春武军宽牛涛李海波朱国森章军王学强郭佳
Owner SHOUGANG CORPORATION
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