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Steel 55MnB for domestic gardening tools and preparation method thereof

A gardening tool and household technology, which is applied in the field of steel 55MnB for household gardening tools and its preparation, can solve the problems of poor processability, uneven hardness, low hardness, etc., and achieve avoiding low hardness, excellent hardenability, high The effect of carbon content

Active Publication Date: 2015-05-20
NINGBO IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a steel 55MnB for household gardening tools and its preparation method, which solves the problems of poor processability, low hardness, uneven hardness and soft spots that are easy to occur in ordinary medium carbon steel

Method used

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  • Steel 55MnB for domestic gardening tools and preparation method thereof
  • Steel 55MnB for domestic gardening tools and preparation method thereof
  • Steel 55MnB for domestic gardening tools and preparation method thereof

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Experimental program
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Embodiment 1

[0025] (1) Quality Design

[0026] The chemical composition of 55MnB steel is: C: 0.52~0.60%, Si: 0.15~0.35%, Mn: 0.70~1.00%, P≤0.025%, S≤0.008%, Als: 0.010~0.060%, B: 0.0005~0.0030 %, the balance is Fe and unavoidable impurities.

[0027] The production process is: hot metal desulfurization, converter blowing, LF refining, RH vacuum refining, continuous casting, hot direct loading, soaking, rough rolling, finish rolling, laminar cooling, coiling, slow cooling and delivery.

[0028] (2) Smelting technology

[0029] Desulfurization of molten iron to [S]≤0.005%;

[0030] Bottom blowing in converter smelting is switched with nitrogen and argon; tap slag is kept out, and the amount of slag dropped in the converter is strictly controlled; tap steel is alloyed with Si, Mn alloys and recarburizers;

[0031] It is required that the argon blowing at the bottom of the ladle is good; the upper LF furnace is used to treat the white slag produced by the ladle furnace, and desulfurize to...

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Abstract

The invention relates to a steel 55MnB for domestic gardening tools and a preparation method thereof. The steel 55MnB for domestic gardening tools comprises 0.52-0.60% of C, 0.15-0.35% of Si, 0.70-1.00% of Mn, at most 0.025% of P, at most 0.008% of S, 0.010-0.060% of Als, 0.0005-0.0030% of B, and the balance of Fe and inevitable impurities. The preparation method adopts medium-carbon steel and comprises the following steps: molten iron desulfurization, converter blowing, LF (ladle furnace) refining, RH vacuum refining, continuous casting, hot direct charging, soaking, rough rolling, finish rolling, laminar cooling, coiling, slow cooling and factory leaving. The steel 55MnB for domestic gardening tools has higher carbon content and excellent hardenability, avoids hardness nonuniformity and overlow hardness of the medium-carbon steel after heat treatment, and enhances the processing yield; and the steel 55MnB for domestic gardening tools has favorable hardenability.

Description

technical field [0001] The invention belongs to the field of gardening tools, in particular to a steel 55MnB for household gardening tools and a preparation method thereof. Background technique [0002] Domestically produced household gardening tools, gardening scissors and other tools are mainly exported to European and American countries, and their production volume has gradually increased in recent years. The main steel used in the production of household gardening tools is medium-high carbon steel and stainless steel. The steel grades mainly include carbon steel SK85, 50C, 55C, 10B38 and stainless steel 3CR13. Among them, the largest manufacturer in Guangdong region consumes 30,000 tons of medium-high carbon steel per year. [0003] Manufacturers of gardening tools report that there are three main problems in the medium carbon steel materials currently used: (1) poor processability; (2) low hardness; (3) uneven hardness and soft spots. The latter two issues have a relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21C7/10C21C7/00C21D8/02
Inventor 刘万善陆志新佟岗王辉曹太平张保忠赵彦灵李波张本亮曹黎锰张建方
Owner NINGBO IRON & STEEL
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