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Special steel for hardware tool and preparation method thereof

A technology for hardware tools and processes, applied in the field of special steel for hardware tools and its preparation, can solve the problems of confusion in the market of steel for hardware tools and lack of uniform standards, and achieve the effects of ensuring strength, improving red-hardness performance, and improving ductility.

Active Publication Date: 2014-09-10
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the steel market for hardware tools is extremely chaotic, and there is no uniform standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A special steel for hardware tools, its chemical composition is calculated by weight percentage: C: 0.53%, Si: 0.18%, Mn: 0.39%, P: 0.008%, S: 0.00355, Cr: 0.45%, Ni: 0.23%, Cu: 0.20%, Ti: 0.010%, and the rest are iron and unavoidable impurities.

[0033] The preparation method of the steel is carried out according to the usual pure steel process, including the steps of steel smelting, LF furnace refining, continuous casting, slab heating, rolling, cooling, and coiling, wherein:

[0034] Electric furnace smelting, tapping temperature 1630℃, tapping target [C]: 0.15%, tapping P: 0.004%, adding active lime, deoxidized aluminum 1.2kg / t and Mn-Si, high C- Cr, Ni alloy;

[0035] Refining in LF furnace, sending electrified slag, then adding calcium carbide, SiC, etc. for deoxidation, making white slag and keeping it for 22 minutes, after the composition is adjusted, blow argon for 10 minutes;

[0036] The continuous casting superheat is 16°C (the liquidus temperature of thi...

Embodiment 2

[0042] A special steel for hardware tools, its chemical composition is calculated by weight percentage: C: 0.58%, Si: 0.35%, Mn: 0.20%, P: 0.020%, S: 0.005%, Cr: 0.30%, Ni: 0.30% , Cu: 0.08%, Ti: 0.020%, and the rest are iron and unavoidable impurities.

[0043] The preparation method of the steel is carried out according to the usual pure steel process, including the steps of steel smelting, LF furnace refining, continuous casting, slab heating, rolling, cooling, and coiling, wherein:

[0044] Converter smelting, tapping temperature 1680°C, tapping target [C]: 0.30%, tapping P: 0.015%, adding lime, deoxidized aluminum 0.8kg / t and alloys when tapping 1 / 3;

[0045] Refining white slag in LF furnace: 15 minutes, soft argon blowing after adjusting the ingredients: 20 minutes;

[0046] The continuous casting superheat is 30°C (the liquidus temperature of this steel is 1490°C), the continuous casting slab size: 200×200mm, and the typical casting speed is 1.3m / min;

[0047] The he...

Embodiment 3

[0052] A special steel for hardware tools, its chemical composition is calculated by weight percentage: C: 0.55%, Si: 0.24%, Mn: 0.30%, P: 0.012%, S: 0.001%, Cr: 0.355, Ni: 0.25%, Cu: 0.12%, Ti: 0.015%, and the rest are iron and unavoidable impurities.

[0053] The preparation method of the steel is carried out according to the usual pure steel process, including the steps of steel smelting, LF furnace refining, continuous casting, slab heating, rolling, cooling, and coiling, wherein:

[0054] Electric furnace smelting, tapping temperature 1652°C, tapping target [C]: 0.19%, tapping P: 0.007%, adding lime, deoxidized aluminum 1.0kg / t and alloys when tapping 1 / 3;

[0055] LF furnace refining white slag retention time: 18min, soft argon blowing after the ingredients are adjusted: 17min;

[0056] The continuous casting superheat is 22°C (the liquidus temperature of this steel is 1490°C), the continuous casting slab size: 240×240mm, and the typical casting speed is 0.8m / min;

[0...

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Abstract

The invention discloses a special steel for a hardware tool and a preparation method thereof. The steel comprises the following chemical components in percentage by weight: 0.50-0.60% of C, 0.17-0.37% of Si, 0.20-0.50% of Mn, 0.008-0.020% of P, 0.001-0.005% of S, 0.25-0.60% of Cr, 0.20-0.35% of Ni, 0.07-0.25% of Cu, 0.010-0.030% of Ti, and the rest amount of iron and inevitable impurities. The preparation method is performed by a general clean steel process, and comprises the steps of steel smelting, LF furnace refining, continuous casting, casting blank heating, rolling, cooling and reeling. All alloy element components in the steel are designed to properly increase the carbon content and decrease the content of such noble metals as Ni and Cr; the process of smelting and rolling is controlled to obtain the special steel for the hardware tool with high-hardness surface and low-hardness-toughness heart material matrix; and the steel can satisfy the performance needed by the hardware tool and the target of optical economic benefit.

Description

technical field [0001] The invention belongs to the technical field of special steel for hardware tools, in particular to a special steel for hardware tools and a preparation method thereof. Background technique [0002] Hardware tools are important basic parts and are widely used in most mechanical product processing, engineering structure construction, maintenance of all products and daily life. Steel for hardware tools is a highly professional steel type. It should have a high-hardened surface and a low-hardness and tough core. Jumping, falling blocks, peeling, etc. Because steel types should have these special properties, conventional steel for hardware tools is mainly to add a large amount of alloying elements chromium Cr, nickel Ni, molybdenum Mo, vanadium V, etc. to medium carbon steel, and even add tungsten W, titanium Ti and cobalt Precious and rare heavy metals such as Co can obtain the mechanical properties required by the above hardware tools through controlled...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C33/04C21D8/00
Inventor 陈庆丰张贤忠陈华强余爱华汪菊华许竹桃杜方李献忠孙晶邵兰李伟万升
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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