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Steel plate for engineering machinery and production method of steel plate

A technology for construction machinery and production methods, applied in the field of high-strength and high-toughness steel plates, can solve the problems of small strength and low-temperature impact energy value margins, incomplete elimination of internal stress of steel plates, and low flatness of plate shape, etc. The effect of small anisotropy, superior bending performance and high straightness

Active Publication Date: 2015-01-07
湖南华菱涟源钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The problems existing in the existing technology are: many steel enterprises are subject to the limitation of cooling equipment, and the cooling rate after rolling is slow, which makes the margin of strength and low-temperature impact work value small
In addition, due to the lack of wide-band steel heat treatment production lines in other domestic steel mills, cross-cut slabs of hot-rolled coils or cross-cut slabs of hot-rolled coils after slow cooling and self-tempering or cross-cut slabs of hot-rolled coils after bell-type annealing are used for cross-cutting. Goods, the internal stress of the steel plate after leveling is not completely eliminated, and the flatness of the plate shape is not high, which affects the subsequent boom pressing

Method used

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  • Steel plate for engineering machinery and production method of steel plate
  • Steel plate for engineering machinery and production method of steel plate
  • Steel plate for engineering machinery and production method of steel plate

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Experimental program
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Embodiment 1

[0037] The molten steel smelted in a 210-ton converter and refined by LF furnace and RH furnace is poured into a slab in a slab continuous casting machine, and its chemical composition mass percentage is: C 0.076, Si 0.21, Mn 1.81, P 0.011, S 0.0017 , Als 0.032, Ca 0.0005, Nb 0.060, Ti 0.101, Mo 0.19, and the rest are Fe and unavoidable impurities.

[0038] The thickness of the cast slab is 230 mm, and it is rolled on the 2250 conventional hot continuous rolling production line. The heating temperature is 1240 ° C, the finish rolling entrance temperature is 1060 ° C, the thickness of the intermediate billet is 46 mm, the final rolling temperature is 850 ° C, and the target thickness is 4 mm. After rolling, it is cooled by ultra-fast cooling and ACC layer cooling to the target coiling temperature of 600°C, and the steel coil is air-cooled after coiling. After the temperature of the steel coil is lower than 60°C, the steel coil can be flattened on the transverse line, and the fl...

Embodiment 2

[0044] The molten steel smelted in a 210-ton converter and refined by LF furnace and RH furnace is poured into a slab in a slab continuous casting machine, and its chemical composition mass percentage is: C 0.073, Si 0.26, Mn 1.82, P 0.012, S 0.0029 , Als 0.029, Ca 0.0005, Nb 0.063, Ti 0.116, Mo 0.18, and the rest are Fe and unavoidable impurities.

[0045] The thickness of the cast slab is 230mm, and it is rolled on the 2250 conventional hot continuous rolling production line. The heating temperature is 1240°C, the finish rolling entrance temperature is 1030°C, the thickness of the intermediate billet is 51mm, the final rolling temperature is 850°C, and the target thickness is 6mm. After rolling, it is cooled by ultra-fast cooling and ACC layer cooling to the target coiling temperature of 600°C, and the steel coil is air-cooled after coiling. After the temperature of the steel coil is lower than 60°C, the steel coil can be flattened on the transverse line, and the flattened s...

Embodiment 3

[0051] The molten steel smelted in a 210-ton converter and refined by LF furnace and RH furnace is poured into a slab in a slab continuous casting machine, and its mass percentage is: C 0.068, Si 0.0.21, Mn 1.87, P 0.013, S 0.0022 , Als 0.034, Ca 0.0008, Nb 0.061, Ti 0.109, Mo 0.19, and the rest are Fe and unavoidable impurities.

[0052] The thickness of the cast slab is 230mm, and it is rolled on the 2250 conventional hot continuous rolling production line. The heating temperature is 1240°C, the finish rolling entrance temperature is 1030°C, the thickness of the intermediate billet is 54mm, the final rolling temperature is 840°C, and the target thickness is 8mm. After rolling, it is cooled to the target coiling temperature of 580°C by ultra-fast cooling and ACC layer cooling, and the steel coil is air-cooled after coiling. After the temperature of the steel coil is lower than 60°C, the steel coil is flattened on the transverse line, and the flattened steel plate is tempered ...

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Abstract

The invention discloses a steel plate for engineering machinery and a production method of the steel plate. The steel plate comprises the following chemical constituents by mass percent: 0.05-0.09% of C, 0.05-0.30% of Si, 1.5-2.0% of Mn, 0-0.025% of P, 0-0.005% of S, 0-0.07% of Nb, 0.08-0.15% of Ti, 0.10-0.30% of Mo, 0.015-0.06% of Als, 0.0010-0.0030% of Ca, 0-0.006% of N, and the balance of Fe. The steel plate is 3.0-8.5 mm in thickness. The steel plate disclosed by the invention is produced by advanced ultra fast cooling equipment and a 2250-mm wide flat steel thermal treatment line, which is unique at home, high in surplus of strength and ductility, excellent in impact toughness, low in postwelding strength loss rate, particularly low in anisotropism and unevenness, excellent in bending performance, and suitable for manufacturing the suspension arm for a crane and other engineering machinery and vehicles.

Description

technical field [0001] The invention relates to a high-strength and high-toughness steel plate with a yield strength of 700 MPa and a production method thereof, in particular to a steel plate used for booms of engineering machinery such as cranes and a production method thereof. Background technique [0002] Lightweight design has been widely used in aerospace technology, automobiles, and electronics industries, but in the field of domestic construction machinery vehicles, especially construction cranes, this field is still in its infancy. Realizing the lightweight of the core component of the construction crane - the boom - can significantly reduce the crane's workload, increase the rated power, and achieve a leap in equipment performance. The use of high-strength and high-toughness steel plates with good mechanical properties and performance can reduce the weight of engineering crane booms and achieve the goal of lightweighting. [0003] The main technical requirements fo...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
Inventor 曾斌王慎德廖志肖尊湖刘建华肖爱达徐刚军杨志刚周明伟
Owner 湖南华菱涟源钢铁有限公司
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