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Low-cost chromium-molybdenum steel smelting production method

A production method and technology for chromium molybdenum steel, applied in the field of metallurgy, can solve the problems of high cost and high energy consumption, and achieve the effects of low cost, low energy consumption and large pollution

Inactive Publication Date: 2018-12-18
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Under normal circumstances, the alloying of molybdenum in chrome-molybdenum steel adopts ferromolybdenum with a molybdenum content of about 58%. This method consumes a lot of energy and costs relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The chromium-molybdenum steel plate 14Cr1MoR product thickness of present embodiment low-cost smelting is 8mm, and its production method comprises the following processing steps:

[0024] (1) The molybdenum oxide balls with a molybdenum content of 60% and scrap steel are directly mixed into the converter, and then the iron mixing operation is performed, and the steel output is 111 tons;

[0025] (2) After the converter smelting is completed, the molten steel is transferred to the ladle furnace for refining and VD vacuum treatment in sequence. The vacuum degree of VD vacuum treatment is 66Pa, and the vacuum treatment time is 25min. billet;

[0026] (3) The continuous casting billets were stacked for 24 hours and then unstacked. Rolling was completed in a 4100mm rolling mill, and 14Cr1MoR finished steel plates were obtained after flaw detection and heat treatment.

[0027] The flaw detection of the steel plate meets the NB / T47013.3-2015 standard Class I qualification, an...

Embodiment 2

[0030] The chromium-molybdenum steel plate 14Cr1MoR product thickness of present embodiment low-cost smelting is 110mm, and its production method comprises the following processing steps:

[0031] (1) Mix molybdenum oxide balls with a molybdenum content of 62% and scrap steel directly into the converter, and then perform iron mixing operation, with a steel output of 115 tons;

[0032] (2) After the converter smelting is completed, the molten steel is transferred to the ladle furnace for refining and VD vacuum treatment in sequence. The vacuum degree of VD vacuum treatment is 66Pa, and the vacuum treatment time is 26min. billet;

[0033] (3) Continuous casting blanks were stacked for 28 hours and then unstacked, rolled in a 4100mm rolling mill, and 14Cr1MoR finished steel plates were obtained after flaw detection and heat treatment.

[0034] The flaw detection of the steel plate meets the NB / T47013.3-2015 standard Class I qualification, and the pass rate of flaw detection is 1...

Embodiment 3

[0037] The chromium-molybdenum steel plate 15CrMoR product thickness of present embodiment low-cost smelting is 8mm, and its production method comprises the following processing steps:

[0038] (1) The molybdenum oxide balls with a molybdenum content of 63% and scrap steel are directly mixed into the converter, and then the iron mixing operation is performed, and the steel output is 118 tons;

[0039] (2) After the converter smelting is completed, the molten steel is transferred to the ladle furnace for refining and VD vacuum treatment in sequence. The vacuum degree of VD vacuum treatment is 66Pa, and the vacuum treatment time is 27min. billet;

[0040] (3) The continuous casting billets were stacked for 24 hours, then unstacked, rolled in a 4100mm rolling mill, and 15CrMoR finished steel plates were obtained after flaw detection and heat treatment.

[0041] The flaw detection of the steel plate meets the NB / T47013.3-2015 standard Class I qualification, and the pass rate of f...

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Abstract

The invention discloses a low-cost chromium-molybdenum steel smelting production method. The low-cost chromium-molybdenum steel smelting production method comprises the following steps that firstly, molybdenum oxide balls and waste steel are directly mixed according to a mass ratio of 1:5 and then put into a converter, and iron adding operation is carried out; secondly, after smelting of the converter is completed, molten steel is transferred into a ladle furnace to be sequentially subjected to refining and VD vacuum treatment, later on, continuous casting operation is carried out on a fracture surface crystallizer continuous casting machine, and qualified continuous casting blank is obtained; and thirdly, after the continuous casting blank material is subjected to stacking treatment, rolling is completed through a rolling mill, and finished products of steel plates are obtained after flaw detection and heat treatment. According to the low-cost chromium-molybdenum steel smelting production method, the thicknesses of the steel plates are 8 mm-110 mm, the average yield of the molybdenum element is larger than or equal to 98%, the yield strength of the steel plates is larger than or equal to 310 MPa, the extension strength is larger than or equal to 520 MPa, the ductility is larger than or equal to 20%, the average lateral impact energy value at the temperature of -18 DEG C or below is larger than or equal to 100 J, the flaw detection yield is 100%, and the performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method for smelting chromium-molybdenum steel at low cost. Background technique [0002] In order to ensure the stable medium and high temperature performance of chromium-molybdenum steel plates for pressure vessels, only the content of Cr and Mo should be controlled within a certain range to promote the formation of chromium-rich carbides and prevent the formation of molybdenum carbides, thereby inhibiting the occurrence of temper embrittlement ; At the same time, solid solution Mo can not only improve the high temperature strength of steel but also reduce the accumulation of P at the grain boundary, improve the temper embrittlement resistance, hardenability, heat strength and temper stability of chromium molybdenum steel. [0003] Generally, ferromolybdenum with a molybdenum content of about 58% is used for the alloying of molybdenum in chrome-molybd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/10C21C5/28
CPCC21C5/28C21C7/10C22C33/006C22C33/04Y02P10/20
Inventor 邓建军李杰李样兵吴艳阳牛红星袁锦程赵文忠龙杰柳付芳尹卫江侯敬超王东阳
Owner WUYANG IRON & STEEL