10-80-mm high-strength low-crack sensitive steel SX780CF for large-scale hydroelectric project and preparation method thereof

A hydropower engineering and high-strength technology, which is applied in the field of medium and heavy plate production, can solve the problems of reducing the yield of steel products, reducing mechanical properties, and affecting the surface quality of steel products, and achieves good austenite uniformity and fine austenite structure , the effect of preventing excessive grain coarsening

Active Publication Date: 2016-09-07
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The yield strength of the steel plate is only 550-600MPa and 660-700MPa respectively, and the mechanical properties of the steel plate can no longer meet the current high-strength requirements of steel for hydropower;
[0006] (2) During the preparation of the above-mentioned steel plates, the steel billet ignored the...

Method used

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  • 10-80-mm high-strength low-crack sensitive steel SX780CF for large-scale hydroelectric project and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A high-strength and low-crack-sensitivity steel SX780CF for 10-80mm large-scale hydropower projects, including the following chemical components in mass percentages (unit, wt%): C: 0.05, Si: 0.2, Mn: 1.0, P: 0.010, S: 0.001, Ni: 0.9, Cu: 0.15, Cr: 0.4, Mo: 0.4, V+Nb+Ti: 0.1, Als: 0.015, the balance is Fe and residual elements; the Ceq of the high-strength and low-crack-sensitive steel SX780CF is 0.52, and Pcm is 0.10.

[0036] Its preparation method includes molten iron desulfurization, converter smelting, VD steelmaking, LF refining, VD vacuum refining, continuous casting, billet cutting, surface temperature spraying of high-temperature anti-oxidation coating, heating, high-pressure water descaling, controlled rolling and controlled cooling , pile cooling, flaw detection, quenching and tempering heat treatment, performance inspection, cutting, storage;

[0037] The converter smelting process: at the end of the converter, the tapping temperature is 1630°C, the C is 0.0...

Embodiment 2

[0048] A high-strength and low-crack-sensitive steel SX780CF for 10-80mm large-scale hydropower projects, including the following chemical components in mass percentages (unit, wt%): C: 0.09, Si: 0.1, Mn: 1.3, P: 0.002, S: 0.005, Ni: 0.6, Cu: 0.25, Cr: 0.2, Mo: 0.6, V+Nb+Ti: 0.05, Als: 0.045, the balance is Fe and residual elements; the Ceq of the high-strength and low-crack-sensitive steel SX780CF is 0.30 and Pcm is 0.25.

[0049] Its preparation method includes molten iron desulfurization, converter smelting, VD steelmaking, LF refining, VD vacuum refining, continuous casting, billet cutting, surface temperature spraying of high-temperature anti-oxidation coating, heating, high-pressure water descaling, controlled rolling and controlled cooling , pile cooling, flaw detection, quenching and tempering heat treatment, performance inspection, cutting, storage;

[0050] The converter smelting process: at the end of the converter, the tapping temperature is 1640°C, the C is 0.09%...

Embodiment 3

[0061] A high-strength and low-crack-sensitivity steel SX780CF for 10-80mm large-scale hydropower projects, including the following chemical components in mass percentages (unit, wt%): C: 0.07, Si: 0.18, Mn: 1.2, P: 0.006, S: 0.002, Ni: 0.8, Cu: 0.17, Cr: 0.25, Mo: 0.45, V+Nb+Ti: 0.06, Als: 0.028, the balance is Fe and residual elements; the Ceq of the high-strength and low-crack-sensitive steel SX780CF is 0.33, and Pcm is 0.18.

[0062]Its preparation method includes molten iron desulfurization, converter smelting, VD steelmaking, LF refining, VD vacuum refining, continuous casting, billet cutting, surface temperature spraying of high-temperature anti-oxidation coating, heating, high-pressure water descaling, controlled rolling and controlled cooling , pile cooling, flaw detection, quenching and tempering heat treatment, performance inspection, cutting, storage;

[0063] The converter smelting process: at the end of the converter, the tapping temperature is 1635°C, the C is ...

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Abstract

The invention discloses 10-80-mm high-strength low-crack sensitive steel SX780CF for the large-scale hydroelectric project and a preparation method thereof. The high-strength low-crack sensitive steel SX780CF comprises the following chemical components in percentage by mass (unit, wt%): 0.05-0.09% of C, 0.1-0.2% of Si, 1.0-1.3% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.6-0.9% of Ni, 0.15-0.25% of Cu, 0.2-0.4% of Cr, 0.4-0.6% of Mo, less than or equal to 0.1% of V+Nb+Ti, 0.015-0.045% of Als and the balance Fe and residual elements, wherein Ceq of the high-strength low-crack sensitive steel SX780CF is less than or equal to 0.52, and Pcm of the high-strength low-crack sensitive steel SX780CF is less than or equal to 0.25. By virtue of reasonable component design and a series of processing measures, a 10-80-mm-thick high-strength low-crack sensitive SX780CF steel plate, which is low in cost, is high in production efficiency, is high in yield and is good in surface quality, for the large-scale hydroelectric project is successfully developed; and according to an oblique Y type groove cold crack resistant test, the 10-80-mm high-strength low-crack sensitive SX780CF steel plate has good weldability.

Description

technical field [0001] The invention belongs to the field of plate production, and in particular relates to a high-strength and low-crack-sensitivity steel SX780CF for 10-80mm large-scale hydropower projects and a preparation method thereof. Background technique [0002] The steel used in hydropower is used in a special environment, and the requirements for the strength, toughness, welding performance, and corrosion resistance of the steel plate are very strict. SX780CF is a high-strength and low-crack-sensitive steel used in large-scale hydropower projects. It is mainly used for penstocks and volutes in hydropower stations. The pressure pipes and volutes are used to transport water from reservoirs, pressure forebays or surge chambers to turbines. Water pipes are generally in a pressurized state, which is characterized by the concentration of most or all of the water head of the hydropower station. Therefore, the steel for penstocks and volute casings needs to have high stre...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/08C22C38/16C22C38/18C22C38/12C22C38/06C22C38/14C22C33/06C21D8/02C21D1/18C21D1/68
CPCC21D1/18C21D1/68C21D6/005C21D8/0226C21D8/0263C21D2211/001C21D2211/005C22C33/06C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18
Inventor 许少普张占杰朱书成李忠波唐郑磊康文举刘庆波袁永旗高照海杨阳杨东袁少威
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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