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A kind of 345mpa grade LP steel plate and production method thereof

A production method and technology for steel plates, applied in the field of metallurgy, can solve the problems of complex production process, poor control stability, low production efficiency, etc., and achieve the effect of simple process flow

Active Publication Date: 2019-12-13
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1) The steel plate thickness change specification is small, and the scope of application is narrow;
[0008] 2) The wedge shape of the steel plate rolled in the last pass is adopted, and the control accuracy is poor;
[0009] 3) The production process is complicated, the production efficiency is low, and the control stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Chemical composition one of the molten steel in the molten steel tank 1 is: C 0.03%; Si 0.4%; Mn 1.00%; P 0.020%; S 0.015%; V 0.4%; Als 0.005%;

[0045] The chemical composition two of molten steel in molten steel tank 2 is: C 0.10%; Si 0.20%; Mn 0.40%; P 0.020%; S0.015%; Ti 0.01%; V 0.6%; Als 0.005%; Impurities to avoid;

[0046] Two tanks of molten steel are used to mix and pour continuous casting billets. After sampling inspection, the chemical composition of the head (corresponding to the thin end of LP steel plate) is chemical composition 1, and the chemical composition of the tail (corresponding to the thick end of LP steel plate) is chemical composition 2. , the chemical composition in the middle is: C 0.06%; Si 0.30%; Mn 0.68%; V 0.52%; Ti 0.005%; Als 0.005%; the rest is Fe and unavoidable impurities.

[0047] The continuous casting billet is rolled into a wedge-shaped LP steel plate, the thickness of the thin end is 12mm, the thickness of the thick end is 30mm...

Embodiment 2

[0049] The chemical composition of the molten steel in the molten steel tank 1 is: C 0.06%; Si 0.6%; Mn 1.60%; P 0.015%; S 0.010%; V 0.6%; Als 0.045%; the rest is Fe and inevitable impurities;

[0050] The chemical composition two of the molten steel in the molten steel tank 2 is: C 0.14%; Si 0.45%; Mn 0.60%; P 0.015%; S0.010%; Ti 0.03%; V 0.8%; Impurities to avoid;

[0051] Two tanks of molten steel are used to mix and pour continuous casting billets. After sampling inspection, the chemical composition of the head (corresponding to the thin end of LP steel plate) is chemical composition 1, and the chemical composition of the tail (corresponding to the thick end of LP steel plate) is chemical composition 2. , the chemical composition in the middle is: C 0.10%; Si 0.35%; Mn 1.10%; V 0.7%; Ti 0.015%; Als 0.045%; the rest is Fe and unavoidable impurities.

[0052] The continuous casting billet is rolled into a wedge-shaped LP steel plate, the thickness of the thin end is 20mm, t...

Embodiment 3

[0054] Chemical composition one of the molten steel in the molten steel tank 1 is: C 0.05%; Si 0.5%; Mn 1.30%; P 0.010%; S 0.005%; V 0.5%; Als 0.025%;

[0055] The chemical composition of molten steel in molten steel tank 2 is: C 0.13%; Si 0.35%; Mn 0.50%; P 0.010%; S0.005%; Ti 0.02%; V 0.8%; Impurities to avoid;

[0056] Two tanks of molten steel are used to mix and pour continuous casting billets. After sampling inspection, the chemical composition of the head (corresponding to the thin end of LP steel plate) is chemical composition 1, and the chemical composition of the tail (corresponding to the thick end of LP steel plate) is chemical composition 2. , the middle chemical composition is: C 0.10%; Si 0.43%; Mn 1.06%; V 0.065%; Ti 0.015%; Als 0.030%; the rest is Fe and unavoidable impurities.

[0057] The continuous casting billet is rolled into a wedge-shaped LP steel plate, the thickness of the thin end is 16mm, the thickness of the thick end is 35mm, and the length is 20...

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PUM

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Abstract

The invention relates to a 345MPa level LP steel plate and a production method thereof. The LP steel plate is a wedge steel plate with one end thin and one end thick; the chemical component of the thin end of the LP steel plate is the first chemical component, the chemical component of the thick end of the LP steel plate is a second chemical component, and the balance is Fe and inevitable impurities. The chemical component of the middle of the LP steel plate is in transition from the first chemical component to the second chemical component from the thin end to the thick end, the yield strength of the LP steel plate ranges from 345 MPa to 400 MPa, and -20 DEG C impact power is larger than or equal to 100J. Two cans of molten steel with different chemical components are adopted to pour a continuous casting billet, the continuous casting billet has the evenly changed chemical component in the longitudinal direction, the continuous casting billet is rolled to directly produce the LP steelplate, the LP steel plate has the beneficial effect that from the thin end to the thick end, the property is uniform and consistent, and the LP steel plate is excellent in whole property and high inadaptation.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a 345MPa grade LP steel plate and a production method thereof. Background technique [0002] LP (longitudinal variable thickness) steel plate refers to a steel plate with a special longitudinal shape whose thickness changes continuously along the rolling direction. It is a steel plate whose longitudinal thickness is changed by continuously changing the opening of the roll during the rolling process. Since the longitudinal variable thickness steel plate can change its thickness according to the load bearing conditions, it can optimize the design of structural sections such as bridges, hulls, buildings, etc., which can not only reduce the amount of steel used, reduce the number of welding times, but also improve the thickness of the joints through equal thickness Operability, such as omission of backing plate and taper processing, etc. [0003] The Chinese patent with the appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C38/06C22C38/02C22C38/04C22C38/14C22C33/04B22D11/00
CPCB22D11/001B22D11/007C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 刘明李文斌王元清王华隋轶陈军平刘晓玲李新玲李靖年杨军
Owner ANGANG STEEL CO LTD