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Method for producing medium-carbon steel deformation induced ferrite

A deformation induction and production method technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems affecting the quality stability of bolts, increasing the chance of decarburization on the surface of steel wire, polluting the environment, etc., to avoid surface decarburization , hardness reduction, pollution reduction effect

Active Publication Date: 2008-11-12
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The annealing process consumes a lot of energy, causes metal loss, pollutes the environment, and increases the chance of decarburization on the surface of the steel wire, affecting the stability of the quality of the bolts

Method used

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  • Method for producing medium-carbon steel deformation induced ferrite
  • Method for producing medium-carbon steel deformation induced ferrite
  • Method for producing medium-carbon steel deformation induced ferrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Select SWRCH35K carbon steel, chemical composition: C-0.36%, Si-0.15%, Mn-0.66%, P-0.018%, S-0.007%, Als-0.018%, rough rolling, intermediate rolling, pre-finishing using conventional Process rolling, finishing rolling adopts low-temperature deformation process, specifically: temperature is 780°C, cumulative area reduction rate is 70%, deformation rate is 20 / s, after deformation, it is held at 680°C for 20 minutes, and then air-cooled to obtain carbide balls Or degenerated pearlite + fine ferrite structure, ferrite over-precipitated up to 60%, its metallographic structure see figure 1 .

Embodiment 2

[0016] Select SWRCH35K carbon steel, chemical composition: C-0.34%, Si-0.18%, Mn-0.68%, P-0.015%, S-0.009%, Als-0.022%, rough rolling, intermediate rolling, pre-finishing using conventional Process rolling, finishing rolling adopts low-temperature deformation process, specifically: temperature is 750°C, cumulative area reduction rate is 70%, deformation rate is 20 / s, after deformation, it is held at 680°C for 20 minutes, and then air-cooled to obtain carbide balls Or degenerated pearlite + fine ferrite structure, ferrite over-precipitated up to 62%, its metallographic structure see figure 2 .

Embodiment 3

[0018] Select SWRCH35K carbon steel, chemical composition: C-0.36%, Si-0.15%, Mn-0.66%, P-0.018%, S-0.007%, Als-0.018%, rough rolling, intermediate rolling, pre-finishing using conventional Process rolling, finishing rolling adopts low-temperature deformation process, specifically: temperature is 700°C, cumulative area reduction rate is 50%, deformation rate is 20 / s, after deformation, it is held at 680°C for 20 minutes, and then air-cooled to obtain carbide balls Or degenerated pearlite + fine ferrite structure, the excessive precipitation of ferrite reaches 65%, and its metallographic structure can be seen in image 3 .

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Abstract

Production of medium-carbon steel deformation induced ferrite by excess precipitation is carried out by heating medium-carbon steel deformation at 1190-1230degree, 1-body frame first pressing by high-speed wire-rod production line, 12-body frame medium pressing and 4 / 8 body frame pre-fine pressing, controlled cooling at 0.2-15degree / s, fast phase changing at 660-700degree, isothermal or slow-cooling treating and naturally cooling to normal temperature. Accumulation draft is 50-80%, deformation speed-ration is 10-30 / s, precipitation content reaches to 60-65%. It saves energy resources and has less environmental pollution.

Description

technical field [0001] The invention belongs to a production process method of medium carbon steel, in particular to a controlled rolling method of superfine grain medium carbon steel. Background technique [0002] In recent years, studies have shown that low-carbon steel or low-alloy steel is deformed near the Ar3 temperature of the steel, and the energy storage of austenite increases during deformation, resulting in deformation-induced ferrite transformation, and ultrafine-grained ferrite can be obtained. Chinese patent ZL99109124.8 discloses a "controlled rolling method of microalloyed steel with ultrafine structure". The chemical composition of the microalloyed steel used is as follows (wt%): C: 0.08-0.12; Si: 0.01-0.05; 1.4; Nb: 0.03-0.06; Ti: 0.01-0.03; P<0.015; S≤0.01; Within the temperature range of ℃, two passes of controlled rolling are implemented, and the deformation of each pass is between 20-40%. The amount of deformation is 30-50%, and the interval betwee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C21D11/00C22C38/04
Inventor 苏世怀于同仁惠卫军胡孝三孙维华刚张步海黄社清
Owner MAANSHAN IRON & STEEL CO LTD
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