Sectionalize heating technique in high alloy cold roller blank manufacture

A technology of segmental heating and cold rolling, which is applied in the field of segmental heating technology, can solve the problems of no longer considering the diffusion time and effect of heating, and the effect is not good.

Inactive Publication Date: 2006-02-08
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then carry out the forging process, that is, pressing, pre-drawing, upsetting, drawing with a large amount of reduction, and forming. The process may be three-fire or four-fire, but the subsequent heating does not consider the diffusion time and effect, so the effect is also not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Adopt the heating process of the present invention to produce the cold roll billet of blank Φ570, the material is Cr5, the steel ingot used is 11 tons of electroslag ingot, and the total forging ratio is 4.8.

[0018] After the first fire at 1200-1220°C for 5 hours, the steel ingot is pressed (with a size of Φ500*700) and pre-drawn (with a size of Φ1000), and then returned to the furnace for heat preservation;

[0019] After the holding time of the second fire at 1200-1220°C for 7 hours, start upsetting (the size is Φ1250), large reduction amount drawing (the size is 700*700, change the coarse casting structure into a dense forging structure, and solve the problem at the same time. Flaw detection problem. Then chamfer to Φ700, at this time, reserve a forging ratio of 1.5 from the finished product size), and then return to the furnace for heat preservation;

[0020] The third fire was kept at 1200-1220°C for 8 hours. Since the structure is denser at this time, it is con...

Embodiment 2

[0022] Adopt the heating process of the present invention to produce the cold rolling billet of blank Φ600, the material is Cr3, the steel ingot used is 8 tons of electroslag ingot, and the total forging ratio is 3.7.

[0023] After the first fire at 1200-1220°C for 5 hours, the steel ingot is pressed (with a size of Φ400*600) and pre-drawn (with a size of Φ780), and then returned to the furnace for heat preservation;

[0024] After the holding time of the second fire at 1200-1220°C for 7 hours, start upsetting (the size is Φ1150), large reduction amount drawing (the size is 750*750, change the coarse casting structure into a dense forging structure, and solve the problem at the same time. Flaw detection problem. Then chamfer to Φ750, at this time, reserve a forging ratio of 1.5 from the finished product size), and then return to the furnace for heat preservation;

[0025] The third fire was kept at 1200-1220°C for 8 hours. Since the structure is relatively dense at this time...

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PUM

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Abstract

The invention discloses a sectionwise heating technology in high alloy cold roller blank manufacture, which sets heating temperature of 1200-1220deg C before roller blank is forged. The heating processes comprise stages: first, keeping temperature for five hours and processing it with pressure drawing and prepressing; second, keeping temperature for seven hours and then processing it with metal gathering and forging; third, returning to furnace to keep temperature for eight hours. The invention can eliminate or reduce strip carbide grade efficiently in the course of roller blank manufacture.

Description

technical field [0001] The invention relates to a segmental heating process in the manufacture of high-alloy cold rolling blanks. Background technique [0002] Roll materials for continuous cold rolling are gradually developing towards high chromium and high alloy to meet the requirements of modern rolling mills, such as Baosteel, Panzhihua Iron and Steel, etc. In recent years, forged steel rolls for cold rolling are basically from Cr2, Cr3 to Cr5 and higher Cr content development. With the increase of carbon and alloy content, the segregation phenomenon is serious, and the occurrence rate of carbide bands increases significantly. The banded carbide level is too high (greater than the level 2 judged by the national standard) not only increases the hardness of cold-rolled work rolls during quenching. It also reduces the contact fatigue performance and thermal shock resistance of the roll, which is an important reason for the roughening of the surface of the cold roll body, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J1/06
Inventor 苏俊奇杜修华李立敏
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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