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Heat processing method for obtaining fine grain ferrite in medium carbon steel

A ferrite and fine-grained technology, which is applied in the rolling of large-section profiles or flat materials, and high-level fields, can solve the problems of difficult recycling and reuse of scrap steel, difference in cooling speed in the thickness direction of products, and increase in material costs, etc., to achieve Reduce oxidation burning loss, easy to control, reduce the effect of heating temperature

Inactive Publication Date: 2007-04-11
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above method, the use of alloys and microalloying elements not only greatly increases the cost of materials, but also the process is complicated. More importantly, it is difficult to recycle and reuse scrap steel containing microalloyin

Method used

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  • Heat processing method for obtaining fine grain ferrite in medium carbon steel
  • Heat processing method for obtaining fine grain ferrite in medium carbon steel
  • Heat processing method for obtaining fine grain ferrite in medium carbon steel

Examples

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Example Embodiment

[0015] Example 1:

[0016] The composition of 45 steel used is: 0.45C%, 0.22% Si, 0.60% Mn, 0.019% P, 0.013% S. A e3 =775°C, A r3 =660°C (10°C / S cooling rate). The heating temperature used is 950°C, and the deformation temperature is 800°C. The total deformation in this temperature range is 60%. After deformation, the cooling rate of φ25mm round steel on the cooling bed is simulated, and the cooling rate is segmented to room temperature: the cooling rate between 800℃ and 500℃ is 1.2℃ / s, 500~300 The cooling rate between °C is 0.5 °C / s. The average grain size of ferrite obtained with this composition and deformation process is 8 μm, and the number is 42.6% (the equilibrium number of ferrite at this temperature is 0).

Example Embodiment

[0017] Example 2:

[0018] The composition of 45 steel used is the same as that of Example 1. A e3 =775°C, A r3 =660°C (10°C / S cooling rate). The heating temperature used is 950°C, and the deformation temperature is 680°C. The total deformation in this temperature range is 60%. After deformation, the cooling rate of φ25mm steel bar on the cooling bed is simulated, and the cooling rate is divided to room temperature: the cooling rate between 680~500℃ is 1.2℃ / s, and between 500~300℃ The cooling rate is 0.5°C / s. The average grain size of ferrite obtained by this composition and deformation process is 4 μm, and its quantity is 50.9% (the equilibrium quantity of ferrite at this temperature is 39.5%).

[0019] In the above two embodiments, A e3 And A r3 Large deformation nearby, slow (air cooling) cooling after deformation, all obtained ferrite grains <10μm, and the number exceeds the equilibrium number.

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Abstract

The present invention belongs to the field of metal hot working technology, and is especially hot working process for medium carbon steel to obtain fine grain ferrite. The process includes hot deforming of medium carbon steel in the critical austenitic area in the total deformation amount not less than 50 %, and sectional slow cooling after deformation in the speed of 1.2 deg.c/s from Td to 500 deg.c and 0.5 deg.c/s from 500 deg.c to 300 deg.c to obtain 10 micron below fine ferrite structure and high toughness. The process is suitable for hot working of high grade and great cross section material of medium carbon steel.

Description

technical field [0001] The invention belongs to the field of metal thermal processing, in particular to a thermal processing method for obtaining fine-grained ferrite in medium-carbon steel, and is mainly aimed at rolling high-grade, large-section profiles or flat materials. Background technique [0002] As we all know, steel is a resource-consuming product, so its production and processing should focus on environmental protection and recyclability. At present, in the strengthening and toughening technology of iron and steel materials, the more commonly used means are alloying and microalloying of materials, such as increasing the Mn content to more than 1.0% and adding microalloying elements such as Nb, V, and Ti. In addition, on the basis of the above alloying, controlled rolling and controlled cooling technology is usually used, the essence of which is to achieve solid solution strengthening, second phase strengthening, precipitation strengthening and microstructure refin...

Claims

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Application Information

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IPC IPC(8): C21D1/26C21D11/00C22C38/04
Inventor 陈其安曹会改陈颖杨忠民白埃民车彦民王慧敏
Owner CENT IRON & STEEL RES INST
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