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Method for producing high-strength steel with yield strength of 600MPa level

A yield strength, high-strength steel technology, applied in the field of high-strength steel production, can solve the problems of high cost and complex production process control, and achieve the effects of high formability, easy process control, and good welding performance.

Inactive Publication Date: 2009-09-23
湖南华菱涟源钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the production of high-strength steel with a yield strength of 600MPa and above, the traditional production process is generally used at home and abroad, using one or more alloying elements of Nb, Ti, V, Cr, Mo, Cu, Ni, etc. Microalloying technology, complex production process control and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Technological process: 100t top-bottom combined blown converter, 100t LF ladle refining furnace, 70mm thin slab continuous casting, soaking, high pressure water descaling, 7-stand hot continuous rolling, laminar cooling, coiling.

[0012] The chemical composition of steel is: C: 0.04~0.05wt.%, Si: 0.20~0.25wt.%, Mn: 1.3~1.5wt.%, Ti: 0.06~0.08wt.%, Nb: 0.04~0.05wt.%. , Al: 0.02~0.04wt.%, S≤0.006wt.%, N≤0.008wt.%, P≤0.02wt.%; the balance is Fe and unavoidable impurity elements.

[0013] Process parameters: billet entering furnace temperature 950-1000°C, furnace exiting temperature 1100-1130°C, final rolling temperature 840-870°C, coiling temperature 570-590°C.

[0014] The mechanical properties of the steel plates are shown in Table 1.

[0015] Mechanics and formability of the steel plate in Table 1 Example 1

[0016] Steel plate thickness

Embodiment 2

[0018] Technological process: 100t top-bottom combined blown converter, 100t LF ladle refining furnace, 70mm thin slab continuous casting, soaking, high pressure water descaling, 7-stand hot continuous rolling, laminar cooling, coiling.

[0019] The chemical composition of steel is: C: 0.05~0.06wt.%, Si: 0.25~0.28wt.%, Mn: 1.3~1.5wt.%, Ti: 0.08~0.09wt.%, Nb: 0.03~0.04wt.%. , Al: 0.02~0.04wt.%, S≤0.006wt.%, N≤0.008wt.%, P≤0.02wt.%; the balance is Fe and unavoidable impurity elements.

[0020] Process parameters: billet entering furnace temperature 950-1000°C, furnace exiting temperature 1120-1140°C, final rolling temperature 870-890°C, coiling temperature 595-620°C.

[0021] The mechanical properties of the steel plates are shown in Table 2.

[0022] Mechanics and formability of the steel plate in Table 2 Example 2

[0023] Steel plate thickness

Embodiment 3

[0025] Technological process: 100t top-bottom combined blown converter, 100t LF ladle refining furnace, 70mm thin slab continuous casting, soaking, high pressure water descaling, 7-stand hot continuous rolling, laminar cooling, coiling.

[0026] The chemical composition of steel is: C: 0.06~0.065wt.%, Si: 0.28~0.32wt.%, Mn: 1.4~1.5wt.%, Ti: 0.09~0.10wt.%, Nb: 0.04~0.055wt.%. , Al: 0.02~0.04wt.%, S≤0.006wt.%, N≤0.008wt.%, P≤0.02wt.%; the balance is Fe and unavoidable impurity elements.

[0027] Process parameters: billet entering furnace temperature 980-1030°C, furnace exiting temperature 1130-1150°C, final rolling temperature 890-920°C, coiling temperature 620-650°C.

[0028] The mechanical properties of the steel plates are shown in Table 3.

[0029] Mechanics and formability of the steel plate in Table 3 Example 3

[0030] Steel plate thickness

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Abstract

The invention belongs to the technical field of high-strength steel production, and relates to a method for producing high-strength steel with yield strength of 600MPa level. The high-strength steel is smelted by a converter or an electric furnace; and after the molten steel components are qualified, the molten steel components are delivered to an LF furnace to carry out refining for the molten steel and fine adjustment for the components, wherein the steel comprises the following components in percentage by mass: 0.03 to 0.08 percent of C, 0.20 to 0.50 percent of Si, 1.0 to 1.5 percent of Mn, 0.06 to 0.10 percent of Ti, 0.02 to 0.08 percent of Nb, 0.02 to 0.06 percent of Al, less than or equal to 0.008 percent of limited element S, less than or equal to 0.008 percent of N, less than or equal to 0.04 percent of P, and the balance of Fe. The method adopts a thin slab blank to continuously cast the steel, the charging temperature of a casting blank is between 950 and 1,050 DEG C, the heating temperature is more than or equal to 1,150 DEG C, the discharging temperature is between 1,080 and 1,160 DEG C, the final rolling temperature is between 820 and 920 DEG C, and after laminar cooling, the rolling temperature is between 550 and 650 DEG C. The yield strength of the high-strength steel produced by the method is in a range of 590MPa to 660MPa, the high-strength steel has good forming property and welding property at the same time, and the thickness of a plate is in a range of 1.4 to 9.0 millimeters. By applying the method, the metallurgical components of the steel are simple, the alloying cost is low, and the process is simple and easy to control.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel production, and in particular relates to a method for producing high-strength steel with a yield strength of 600 MPa by adopting Ti and Nb microalloying technology based on a thin slab continuous casting and rolling process. Background technique [0002] The common requirements for construction machinery, oil and gas pipelines, pressure vessels, containers and warships are to have high strength, high toughness, good formability and welding performance; Aspects such as freight volume, extended equipment usage and reduced logistics costs all play an important role. Therefore, society is increasingly demanding high-strength steel plates with good formability and weldability. [0003] For the production of high-strength steel with a yield strength of 600MPa and above, the traditional production process is generally used at home and abroad, using one or more alloying elements of Nb, Ti, V,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C33/04B22D11/00B21B37/74
Inventor 温德智康永林焦国华陈建新刘国民陈林恒周明伟肖爱达朱正谊成小军曹建新
Owner 湖南华菱涟源钢铁有限公司
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