Continuous casting method of sulfur-containing easy-cutting pinion steel

A gear steel, easy-cutting technology, applied in the field of iron and steel metallurgy, can solve the problems of affecting output and low casting speed, and achieve the effect of increasing equipment scale, good quality and ensuring quality

Active Publication Date: 2011-10-12
PANZHIHUA IRON AND STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the invention is the problem that the casting speed is low and the output is affected when the sulfur-containing free-cutting gear steel with qualified quality is produced in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 Casting of sulfur-containing free-cutting gear steel

[0041] What this embodiment adopts is a 200mm×200mm six-machine six-strand billet continuous casting machine. First put the mold flux into the mold of the continuous casting machine. The composition of the mold flux is calculated by weight percentage: SiO 2 35%, CaO: 28%, Al 2 o 3 : 3%, MgO: 4%, Na 2 O: 8%, F: 3%, C: 12%, the rest are impurities, alkalinity CaO / SiO 2 : 0.80, hemispherical point melting temperature: 1085°C; viscosity at 1300°C: 0.32Pa·s. The amount of mold slag used is 0.45kg / ton of steel. The molten steel with a superheat of 28°C after refining is injected into the crystallizer through the submerged nozzle. At this time, the temperature of the molten steel is 1538°C. 0.012%, sulfur 0.028%, chromium 1.30%, titanium 0.07%, acid-soluble aluminum 0.03%, and the balance is iron and impurities. The molten steel in the crystallizer is crystallized under the action of heat exchange of t...

Embodiment 2

[0043] Example 2 Casting of sulfur-containing free-cutting gear steel

[0044] What this embodiment adopts is a 200mm×200mm six-machine six-strand billet continuous casting machine. First put the mold flux into the mold of the continuous casting machine. The composition of the mold flux is calculated by weight percentage: SiO 2 35%, CaO: 28%, Al 2 o 3 : 3%, MgO: 4%, Na 2 O: 8%, F: 3%, C: 12%, the rest are impurities, alkalinity CaO / SiO 2 : 0.80, hemispherical point melting temperature: 1087°C, viscosity at 1300°C: 0.33Pa·s. The amount of mold slag used is 0.40kg / ton of steel. The molten steel with a superheat of 25°C after refining is injected into the crystallizer through the submerged nozzle. At this time, the temperature of the molten steel is 1535°C. Phosphorus 0.011%, sulfur 0.027%, chromium 1.25%, titanium 0.08%, acid-soluble aluminum 0.02%, and the balance is iron and impurities. The molten steel in the crystallizer is crystallized under the action of heat excha...

Embodiment 3

[0046] Example 3 Casting of sulfur-containing free-cutting gear steel

[0047] What this embodiment adopts is a 200mm×200mm six-machine six-strand billet continuous casting machine. First put the mold flux into the mold of the continuous casting machine. The composition of the mold flux is calculated by weight percentage: SiO 2 35%, CaO: 28%, Al 2 o 3 : 3%, MgO: 4%, Na 2 O: 8%, F: 3%, C: 12%, the rest are impurities, alkalinity CaO / SiO 2 : 0.80, hemispherical point melting temperature: 1088°C, viscosity at 1300°C: 0.34Pa·s. The amount of powder used is 0.42kg / ton of steel. The molten steel with a superheat of 27°C after refining is injected into the crystallizer through the submerged nozzle. At this time, the temperature of the molten steel is 1537°C. The composition of the molten steel is: carbon 0.20%, silicon 0.26%, manganese 1.05%, phosphorus 0.010 %, sulfur 0.025%, chromium 1.27%, titanium 0.06%, acid-soluble aluminum 0.030%, and the balance is iron and impurities....

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Abstract

The invention discloses a continuous casting method of a sulfur-containing easy-cutting pinion steel, belonging to the technical field of ferrous metallurgy and solving the problems of low pulling rate and output influence when qualified sulfur-containing easy-cutting pinion steel is produced in the prior art. The continuous casting method of the sulfur-containing easy-cutting pinion steel comprises the following steps of: a, injecting molten steel with the superheat degree of 15-30 DEG C into a crystallizer of a continuous casting machine charged with covering slag for cooling so as to obtain a continuous casting billet, and controlling the using amount of cooling water and the intensity of electromagnetic stirring; and b, pulling the continuous casting billet out of the crystallizer obtained from the step a, sequentially cooling through a secondary cooling zone and an air cooling zone, wherein the pulling rate is 1.3-1.8 m/minute, and the surface temperature of the continuous casting billet is controlled at 1000-1150 DEG C in the secondary cooling zone and controlled at 900-1050 DEG C when entering the air cooling zone. The continuous casting method disclosed by the invention ismainly used for the continuous casting of pinion steel with the section of 200*200 mm.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a continuous casting method for sulfur-containing free-cutting gear steel. Background technique [0002] Gear steel is widely used in automobiles, motorcycles and other fields, so the quality requirements for steel are very high. Due to the high alloy content and high hardness of this type of steel, it brings certain difficulties to the production and processing of gears. Usually, the cutting performance of steel is improved by controlling the sulfur content in steel. In the continuous casting process, if the continuous casting parameters are not well controlled, defects such as serious segregation, loose center, and central shrinkage cavity will appear, which will have an adverse effect on the hardenability of the gear and the control of the band structure, and it is also easy to appear on the outer surface of the slab. Defects such as cracks affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16B22D11/115C22C38/28
Inventor 陈亮陈天明陈永李桂军曾建华杨文中李清春吴国荣寄海明
Owner PANZHIHUA IRON AND STEEL
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