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H-shaped steel hot rolling production method

A production method, the technology of H-shaped steel, applied in the direction of metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve the problems of multi-scale iron scale, press-in, poor removal effect of surface oxide scale, etc., and increase the heating temperature , improve the surface quality of finished products, and stabilize the production effect

Active Publication Date: 2014-11-12
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production of large-scale H-beams above H700×300, due to the influence of billet specifications, descaling capacity, and rolling mill load, the removal effect of surface oxide scale is not good during the production process, resulting in more oxidation in the finished product. Defects such as iron sheet pressing, the pass rate of the first inspection of the product surface is less than 65%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for producing hot-rolled H-shaped steel, said method comprising the following steps:

[0025] Billet heating → high pressure water descaling → billet rolling → reversible universal rolling mill rolling → hot saw sawing → cooling bed cooling → long length straightening → cold saw length → stacking and bundling.

[0026] Main process measures of hot rolling method:

[0027] (1) Billet heating: the soaking temperature of the heating furnace is 1250°C, and the billet interval in the furnace is 500mm;

[0028] (2) High pressure water descaling: 12MPa high pressure water descaling;

[0029] (3) Billet rolling: add 2 vertical rolling passes under light pressure during the rolling process;

[0030] (4) Reversible universal rolling mill rolling: Before and after the rolling process of the reversible universal rolling mill, use 0.5MPa compressed gas to purge the web of the rolled piece;

[0031] (5) The rolled material is naturally cooled in the cooling bed. The steel...

Embodiment 2

[0033] A method for producing hot-rolled H-shaped steel, said method comprising the following steps:

[0034] Billet heating → high pressure water descaling → billet rolling → reversible universal rolling mill rolling → hot saw sawing → cooling bed cooling → long length straightening → cold saw length → stacking and bundling.

[0035] Main process measures of hot rolling method:

[0036] (1) Billet heating: the soaking temperature of the heating furnace is 1320°C, and the billet interval in the furnace is 1500mm;

[0037] (2) High pressure water descaling: 25MPa high pressure water descaling;

[0038] (3) Billet rolling: add 3 vertical rolling passes under light pressure during the rolling process;

[0039] (4) Reversible universal rolling mill rolling: Before and after the rolling process of the reversible universal rolling mill, use 1.5MPa compressed gas to purge the web of the rolled piece;

[0040] (5) The rolled material is naturally cooled in the cooling bed. The stee...

Embodiment 3

[0042] A method for producing hot-rolled H-shaped steel, said method comprising the following steps:

[0043] Billet heating → high pressure water descaling → billet rolling → reversible universal rolling mill rolling → hot saw sawing → cooling bed cooling → long length straightening → cold saw length → stacking and bundling.

[0044] Main process measures of hot rolling method:

[0045] (1) Billet heating: the soaking temperature of the heating furnace is 1280°C, and the billet interval in the furnace is 1000mm;

[0046] (2) High pressure water descaling: 15MPa high pressure water descaling;

[0047] (3) Billet rolling: add one vertical rolling pass under light pressure during the rolling process;

[0048] (4) Reversible universal rolling mill rolling: Before and after the rolling process of the reversible universal rolling mill, use 1MPa compressed gas to purge the web of the rolled piece;

[0049] (5) The rolled material is naturally cooled in the cooling bed. The steel ...

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Abstract

The invention relates to an H-shaped steel hot rolling production method. The method comprises the following steps of heating steel billets, descaling by high pressure water, carrying out cogging rolling, rolling by a reversible universal rolling mill, carrying out saw cutting by a hot saw, cooling by a cold bed, carrying out long fixed-length straightening, carrying out length fixing by a cold saw and stacking and bundling, wherein in the step of heating the steel billet, the soaking temperature of a heating furnace is 1,250 to 1,320 DEG C and billets in the furnace are arranged at intervals of 500 to 1,500mm; in the cogging rolling process, 1 to 3 passes of vertically rolling under the light press condition are increased; before and after the process of rolling by the reversible universal rolling mill, a compressed gas purging step is increased and rolled metals are H-shaped steels with specifications of H700*300, H800*300 and H900*300. According to the invention, scales on the surfaces of the large-specification H-shaped steels can be well removed in the hot rolling process and the surface quality of products is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular, the invention relates to a production method of H-shaped steel hot rolling. Background technique [0002] With the continuous expansion of the application field of hot-rolled H-shaped steel, hot-rolled H-shaped steel has been used in various public facilities and civil buildings, ships, bridges, power station equipment, water conservancy, energy, chemical industry, lifting and transportation machinery and other high-load steel Commonly used in structural parts. Large-scale hot-rolled H-shaped steel is the main load-bearing component. In order to ensure the stability and beauty of the overall structure, end users have higher and higher requirements for product mechanical and process performance, as well as higher requirements for product surface quality. However, in the production of large-scale H-beams above H700×300, due to the influence of billet specifications, descaling cap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/088B21B45/08B21B45/02
Inventor 付常伟赵新华韩蕾蕾邓存善李超郭跃华方金林高祥明
Owner LAIWU IRON & STEEL GRP
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