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Nickel-containing, boron-containing gear steel and production method thereof

A production method and gear steel technology, applied in the manufacture of converters, etc., can solve problems such as large fluctuations, unstable content, and difficult precise control of content, and achieve high hardenability, high purity, and stable hardenability.

Active Publication Date: 2019-02-19
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the hardenability of the boron-containing gear steel depends too much on boron, the content of boron in the steel, especially the content of effective boron, is not easy to achieve precise control, and the content is unstable and fluctuates greatly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The produced vanadium-containing titanium molten iron is mixed into a 120t double blowing vanadium extraction converter for blowing, and the mixing amount is 140t. Within 2 to 3 minutes of vanadium, add 1.5t of iron oxide scale into the furnace, and after 4.5 minutes of oxygen supply, add 300kg of magnesia into the furnace for slag adjustment, and then supply oxygen for 43 seconds to block slag and remove semi-steel and vanadium slag, blowing The end point temperature was 1422°C. The composition of the obtained semi-steel is: 3.68%C, 0.05%Mn, 0.069%P, 0.005%S, 0.034%V, with traces of Cr, Si and Ti.

[0049] The produced semi-steel is mixed into a 120t re-blowing steelmaking converter for blowing, the amount of mixing is 135t, and a 536 oxygen lance is used for oxygen supply, and the double slag method is used for dephosphorization and decarburization. For steelmaking slagging at one time, add slagging material active lime, composite slagging agent, high magnesium lime ...

Embodiment 2

[0055] The prepared low-sulfur vanadium-containing titanium molten iron is mixed into a 120t double blowing vanadium extraction converter for blowing, and the mixing amount is 141t, and then cold solidified pellets are added to the vanadium extraction converter, and a 339 oxygen lance is used to supply oxygen and blow vanadium. Within 2 to 3 minutes of vanadium blowing, add 1.6t of iron oxide scale into the furnace, supply oxygen for 4.6 minutes, add 300kg of magnesia to the furnace for slag adjustment, and then supply oxygen for 45 seconds to block slag and remove semi-steel and vanadium slag. The end temperature of blowing is 1420°C. The composition of the semi-steel obtained is: 3.70%C, 0.05%Mn, 0.067%P, 0.006%S, 0.035%V, Cr, Si and Ti content as traces.

[0056] The semi-steel produced is mixed into a 120t double blowing steelmaking converter for blowing, and the amount of mixing is 136t, and a 536 oxygen lance is used for oxygen supply, and the double slag method is used ...

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Abstract

The invention discloses nickel-containing and boron-containing gear steel and a production method thereof, and belongs to the technical field of production of gear steel. The gear steel comprises, by mass, 0.15-0.19% of carbon, 0.20-0.35% of silicon, 1.00-1.20% of manganese, 0-0.015% of phosphorous, 0-0.010% of sulfur, 1.05-1.25% of chrome, 0.10-0.30% of nickel, 0.001-0.003% of boron, 0.02-0.04% of total aluminum, and the balance iron. In the production process, the processes of dephosphorization and desulfuration and the time of nickel and boron alloying are strictly controlled. The produced gear steel is high in use performance and can replace part of gear steel like Cr-Ni-Mo gear steel and Cr-Mo gear steel.

Description

technical field [0001] The invention belongs to the technical field of gear steel production, and in particular relates to a nickel- and boron-containing gear steel and a production method thereof. Background technique [0002] Gear steel is one of the key materials with high requirements among special alloy steels used in automobiles, railways, ships, and construction machinery, and is the preparation material for core components that ensure safety. At present, Cr-Mn-Ti series gear steel is widely used in China, which has the advantages of low cost, small grain growth tendency, and easy processing. Among them, 20CrMnTiH and its sub-steel grades are its representative steel types. It occupies a dominant position in my country's gear industry, accounting for about 60% of my country's total gear steel. However, some problems have been exposed in the process of production and use. The control of its hardenability in production is still not ideal. Performance requirements for s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/18C22C38/32C22C38/08C22C38/06C21C5/30
CPCC21C5/30C22C38/02C22C38/04C22C38/06C22C38/08C22C38/18C22C38/32
Inventor 郭奠荣陈亮杨森祥黎建全陈天明黄德胜解明科
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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