Control method of toothed wheel steel band structure

A technology of band structure and control method, applied in temperature control, rolling mill control device, heat treatment process control, etc., can solve the uneven hardness and strength, affect the cutting performance of materials, reduce the reliability, safety and service life of gears and other problems to achieve the effect of reducing the level of the banded tissue

Active Publication Date: 2009-03-11
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of the band structure makes the mechanical properties of the material have obvious directionality, which directly affects the cutting performance of the material. After the gear is made, it is easy to cause the hardness and strength of the tooth surface and the tooth root to be uneven, reducing the reliability of the gear. safety and service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1. Pretreatment of molten iron → primary smelting in converter → refining in ladle refining furnace or refining in ladle refining furnace + vacuum degassing furnace → continuous casting process to produce 180mm 2 ×180mm 2 Gear steel continuous casting slab.

[0012] 2. The steel billet is heated by a two-section full-beam walking heating furnace and then rolled at 1100°C. It is rolled continuously and controlled by 20 short-stress line high-strength closed-type red-ring rolling mills, and the final rolling temperature is controlled at 750°C. Φ20mm 2 For hot-rolled round steel, the steel ferrite + pearlite banded structure level is 1.5.

Embodiment 2

[0014] 1. Pretreatment of molten iron → primary smelting in converter → refining in ladle refining furnace or refining in ladle refining furnace + vacuum degassing furnace → continuous casting process to produce 180mm 2 ×180mm 2 Gear steel continuous casting slab.

[0015] 2. After the steel billet is heated by a two-section full-beam walking furnace, it will be rolled at 1100°C. It will be rolled continuously and controlled by 20 short stress line high-strength closed red ring rolling mills, and the final rolling temperature will be controlled at 950°C. Produce Φ25mm 2 For hot-rolled round steel, the ferrite + pearlite band structure of the steel is grade 2.

Embodiment 3

[0017] 1. Pretreatment of molten iron → primary smelting in converter → refining in ladle refining furnace or refining in ladle refining furnace + vacuum degassing furnace → continuous casting process to produce 180mm 2 ×180mm 2 Gear steel continuous casting slab.

[0018] 2. The steel billet is heated by a two-section full-beam walking heating furnace and then rolled at 1080°C. It is continuously rolled and controlled by 20 short-stress-line high-strength closed-type red-ring rolling mills, and the final rolling temperature is controlled at 846°C. Produce Φ35mm 2 For hot-rolled round steel, the ferrite + pearlite band structure of the steel is grade 2.

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PUM

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Abstract

The invention relates to a method for controlling a strip tissue of pinion steel, which belongs to the technical field of the tissue of the pinion steel. The method adopts the following process flow for producing a continuous casting billet of the pinion steel: the pretreatment of molten iron, primary smelting in a converter, refining in a ladle refining furnace or refining in the ladle refining furnace and a vacuum degassing furnace, and continuous casting; the steel billet is heated and is subjected to continuous rolling through 20 short stress line high-rigidity closed-type red ring rolling machines; and different final rolling temperatures are respectively controlled to produce a hot-rolled round steel bar material in order that the level of a steel ferrite and pearlite strip tissue is less than or equal to 2.5. The method has the advantages that different specifications and different final rolling temperatures of the rolled steel are controlled by cooling and other means to realize the aim of enlightening the level of the strip tissue by the steel material with Phi of between 14 and 80 mm<2>. By effectively controlling the level of the strip tissue, the method can meet the requirement of a user on the high-quality pinion steel and improve the qualification rate of the quality of the high-quality pinion steel.

Description

[0001] Field [0002] The invention belongs to the technical field of gear steel structure control, and in particular provides a gear steel band structure control method, which is suitable for controlling the band structure of hot-rolled gear steel. Background technique [0003] Gears are important transmission components in automobile and machinery manufacturing. Gear steel is the key material for manufacturing gears, rods and gear shafts in transmission systems such as automobiles and machinery, and the quality requirements are extremely strict. In addition to requiring steel to have high purity, sufficient core hardenability, good infiltration layer hardenability, and austenite grain size of 6-8 grades, a band structure ≤ 3 grades is also proposed for hot-rolled steel products. Require. [0004] The banded structure of gear steel refers to the microstructure formed by the stacking of proeutectoid ferrite-based bands and pearlite-based bands formed along the rolling direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D11/00B21B37/74B21B37/16
Inventor 崔京玉王猛王全礼唐国志陈京生赵焕春芦斌黄宁陈明跃
Owner SHOUGANG CORPORATION
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