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A kind of high-strength high-toughness ship plate steel and its TMCP production method

A ship plate steel and ship plate technology, applied in the field of high-strength and high-toughness ship plate steel and its TMCP production process, can solve the problems of increasing the cost and price of steel plates, and achieve the effects of low production cost, high and low temperature toughness, and excellent quality of steel plates

Inactive Publication Date: 2011-12-14
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of Ni was added in this invention, and alloying elements such as Cu, Cr, and Mo were added at the same time, which greatly increased the cost price of the steel plate

Method used

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  • A kind of high-strength high-toughness ship plate steel and its TMCP production method
  • A kind of high-strength high-toughness ship plate steel and its TMCP production method
  • A kind of high-strength high-toughness ship plate steel and its TMCP production method

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preparation example Construction

[0032] The present invention also provides a ship plate steel plate, and a method for preparing a ship plate steel plate, including:

[0033] A hot-rolled steel plate with a thickness of 10-50 mm and a width of 1500 mm-4150 mm obtained from the ship plate steel after rough rolling and finish rolling.

[0034] A method for preparing a ship plate steel plate, comprising:

[0035] a) obtain continuous casting slabs after smelting and continuous casting according to the ship plate steel components;

[0036] b) Rough rolling and finishing rolling of the continuous casting slab are carried out to obtain an intermediate slab;

[0037] c) rapidly cooling the slab to obtain a ship plate steel plate.

[0038] Further preferred processing conditions are as follows:

[0039] 1. Rough rolling

[0040] The rough rolling adopts a four-roll reversible rolling mill for 4 to 7 round-trip rolling. The starting temperature is preferably 1100°C to 1200°C, and the temperature during rough rolli...

Embodiment 1

[0052] Example 1: Industrial production of 10mm thick FH40 ship plate steel

[0053] Converter smelting FH40 ship plate steel, the weight percentage of the chemical composition of the steel is: C: 0.05%, Si: 0.36%, Mn: 1.38%, S: 0.002%, P: 0.011%, Nb: 0.033%, Ni: 0.19% , Ti: 0.018%, Als: 0.028, N: 0.006, the steel is cast into a 250mm thick continuous casting slab by conventional continuous casting method, and the slab is sent to a 4300mm wide and thick plate rolling mill for rolling, and the heating and rolling are carried out. Full process control.

[0054] The hot rolling process is controlled as follows:

[0055] The temperature of the continuous casting slab is controlled to be 1193°C; the slab is rough rolled at 1170°C, and the rough rolling is rolled back and forth in 6 passes. After the rough rolling, the steel temperature is 1141°C; after the rough rolling, the thickness of the intermediate slab is 40mm; d. The starting temperature of finishing rolling is 996°C; e. ...

Embodiment 2

[0057] Example 2: Industrial production of 20mm thick FH40 ship plate steel

[0058] Converter smelting FH40 ship plate steel, the weight percentage of the chemical composition of the steel is: C: 0.06%, Si: 0.32%, Mn: 1.43%, S: 0.003%, P: 0.010%, Nb: 0.031%, Ni: 0.21% , Ti: 0.016%, Als: 0.032, N: 0.005, the steel is cast into a 250mm thick continuous casting slab by a conventional continuous casting method, and the slab is sent to a 4300mm wide and thick plate rolling mill for rolling, and the heating and rolling are carried out. Full process control.

[0059] The hot rolling process is controlled as follows:

[0060] a. Control the continuous casting slab heating temperature to 1193°C; b. Rough rolling of the slab at 1171°C. The rough rolling adopts 6 round-trip rolling, and the steel temperature after the rough rolling is 1105°C. The thickness of the intermediate billet after rough rolling is 70mm; d, the starting temperature of finishing rolling is 921°C; e, the finishin...

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Abstract

The invention provides a high-strength and high-toughness ship plate steel and its TMCP production process, which comprises the following components by weight percentage: C: 0.04-0.08%; Si: 0.15-0.40%; Mn: 1.30-1.55%; P : ≤0.012%; S: ≤0.005%; Nb: 0.025~0.045%; Ti: 0.010~0.020%; Ni: 0.015~0.025%; Als: 0.020~0.050%; N: ≤0.007%; Impurities. The invention also provides a ship plate steel plate and a preparation method thereof. The ship plate steel and the ship plate steel plate provided by the invention have low production cost, high production efficiency, stable product performance and small quality fluctuation.

Description

technical field [0001] The invention relates to the field of steel materials and their preparation, in particular to a high-strength and high-toughness ship plate steel and a TMCP production process thereof. Background technique [0002] The steel plate for hull structure is one of the most widely used steel types in the shipbuilding industry. With the development of the global economy, the gradual deepening of the integration process, and the rapid development of the world shipping industry, the demand for large-tonnage ships is increasing year by year, and the demand for high-grade ship plate steel is increasing. Ship plate steel has the characteristics of high requirements and strict inspection. It is one of the high value-added steel products. Major manufacturers put the production of ship plate steel in an important position. [0003] TMCP (ThermoMechanicalControlProcess: thermomechanical control process) is the general term for the technology of air cooling or control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02B21B37/74
Inventor 周平任继银麻衡衣忠文李永强吴德发陈爱娇秦港
Owner LAIWU IRON & STEEL GRP
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