Casting blank heating method for controlling surface to generate ferric oxide structure

A technology of iron oxide scale and surface control, applied in rolling mill control devices, workpiece surface treatment equipment, heat treatment furnaces, etc., can solve the problems of uneven surface of rolls, pitting on the surface of rails, etc., so as to reduce the grinding time of rolls and improve the operation rate of steel rolling. Effect

Inactive Publication Date: 2008-03-19
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of FeO, along with the rolling process, is bonded to the surface of the roll together with the secondary oxide scale. When the bonding amount reaches a certain level, the surface of the roll is uneven, and the bonded material is pressed into the surface of the rail, thereby causing the rail surface pitting defect

Method used

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  • Casting blank heating method for controlling surface to generate ferric oxide structure

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Experimental program
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Effect test

Embodiment 1

[0025] The cross-sectional size of the rail blanks for manufacturing is 280×380mm, and they are loaded into the furnace in groups by the steel charging machine of the heating furnace. There is a gap of 170mm between the two blanks, and there are 26 blanks in each group. Distance, through the progressive beam of the heating furnace, the distance of stepping 550mm at a time is the cycle. According to the rolling rhythm, the billet is sent from the entrance of the heating furnace to the preheating section for preheating. The furnace temperature in the preheating section is 600°C; after preheating The billet enters the first heating section through the progressive beam for heating. The furnace temperature of the first heating section is 1150°C, and the ratio of air and gas in the heating gas is 1:2.0; the billet heated through the first heating section enters the second Heating in the heating section, the furnace temperature of the second heating section is 1280°C, the ratio of air...

Embodiment 2

[0027] The cross-sectional size of the rail blanks for manufacturing is 280×380mm, and they are loaded into the furnace in groups by the steel charging machine of the heating furnace. There is a gap of 120mm between the two blanks. Distance, through the progressive beam of the heating furnace, the distance of stepping 500mm at a time is the period. According to the rolling rhythm, the billet is sent from the entrance of the heating furnace to the preheating section for preheating. The furnace temperature in the preheating section is 570°C. When the billet passes through When the advancing beam is sent to the end of the preheating section, the heating furnace waits for rolling for 30 minutes. At this time, the furnace temperature of the first heating section should be controlled at 1000°C, and the ratio of air and gas in the heating gas should be 1:1.9; the furnace temperature of the second heating section should be 1240°C, and the ratio of air and gas in the heating gas The ra...

Embodiment 3

[0029] The cross-sectional size of the rail blanks for manufacturing is 450×360mm, and they are loaded into the furnace in groups by the steel charging machine of the heating furnace. There is a gap of 170mm between the two blanks, and there are 23 blanks in each group. Distance, through the progressive beam of the heating furnace, the distance of 620mm is taken as a cycle. According to the rolling rhythm, the billet is sent from the entrance of the heating furnace to the preheating section for preheating. The furnace temperature in the preheating section is 580°C; after preheating The billet enters the first heating section through the progressive beam for heating. At this time, the heating furnace is to be rolled for 60 minutes. The furnace temperature of the first heating section should be controlled at 1000°C, and the ratio of air and gas in the heating gas is 1:1.9; the second The furnace temperature in the heating section is 1220°C, and the ratio of air and gas in the hea...

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Abstract

The present invention discloses a cast blank heating method for controlling the iron oxide scale structure generated on the surface in the steel rail production technical field. The method includes the steps that blanks are delivered into the preheating section of a heating furnace for preheating in different groups and in sequence according to the rolling process; then heating is performed in a first heating section and also a second heating section, heat soaking and heat preservation are performed in a heat soaking section, and the blanks are discharged from the furnace and rolled after the rolling temperature is achieved. Through the controlling of the blank heating time, the temperature and the atmosphere, the thickness of an iron protoxide loose layer in an iron oxide scale structure close to the steel substrate surface of a heated cast blank is lower than 50 percent, the thicknesses of other dense layers are higher than 50 percent, the depth of the decarburized layer of the rolled steel rail surface is controlled within 0.3 mm, and the roughness of the steel rail surface is lower than or equal to 0.2 mm.

Description

technical field [0001] The invention relates to the technical field of steel rail manufacturing, in particular to a billet heating method for controlling the oxide scale structure formed on the surface during the steel rail manufacturing. Background technique [0002] With the development of high-speed and heavy-duty railway transportation, higher and higher requirements are put forward for the surface of the rail not only to be smooth and flat, but also to be wear-resistant. The temperature, time, and atmosphere of the billet heated in the furnace can reduce the depth of the decarburization layer on the surface of the rail, reduce the thickness of FeO at the bottom layer of the iron oxide scale on the surface of the rail during the heating process, and enable the billet to be effectively removed by high-pressure water descaling after it leaves the heating furnace. Iron oxide scale adhered to the surface improves the surface quality of the rail. Japanese experts in this fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/70B21B37/00C23C8/14B21B45/04
Inventor 薛念福李里孙浩欧亚松
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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