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Pretreatment-free directly formed hot rolled low carbon steel and manufacturing method thereof

A pretreatment, low carbon steel technology, applied in metal rolling, manufacturing tools, metal rolling, etc., to reduce production costs, protect the environment, and reduce waste acid emissions

Inactive Publication Date: 2012-09-19
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above hot-rolled steel sheets controlled by scale are not involved in the pickling-free pretreatment hot-rolled low-carbon steel for forming under large deformation and complex conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Rolling 3.0×1250mm hot-rolled low-carbon steel without pretreatment and direct forming. The thickness of the continuous casting slab is 230mm, the width of the slab is 1350mm, the length of the slab is controlled at 9.8m, and the surface of the slab has no defects.

[0034] 1) Firstly, the chemical composition according to the percentage by weight is: C: 0.059%, Si: 0.015%, Mn: 0.0308%, S: 0.010%, P: 0.015%, and the rest are iron and unavoidable impurities, followed by Desulfurization of molten iron, converter blowing, argon blowing, refining, continuous casting;

[0035] 2) Slab heating, the heating temperature is 1280°C, and the heating time is 150min;

[0036] 3) Rough rolling, the exit temperature of rough rolling is 1080°C, the rough rolling pass is 3 times, and the descaling pass is 2 times;

[0037] 4) The intermediate billet does not stop on the roller table between rough rolling and finishing rolling, and the heat preservation cover is used to ensure the tempe...

Embodiment 2

[0044] Roll 3.0×1250mm hot-rolled low-carbon steel without pretreatment. The thickness of the continuous casting slab is 230mm, the width of the slab is 1400mm, the length of the slab is controlled at 10.0m, and the surface of the slab has no defects.

[0045] 1) Firstly, the chemical composition according to the percentage by weight is: C: 0.01%, Si: 0.01%, Mn: 0.50%, S: 0.010%, P: 0.005%, and the rest are iron and unavoidable impurities, followed by Desulfurization of molten iron, converter blowing, argon blowing, refining, continuous casting;

[0046] 2) Slab heating, the heating temperature is 1220°C, and the heating time is 200min;

[0047] 3) Rough rolling, the exit temperature of rough rolling is 1100°C; the rolling pass of rough rolling is 5 times, and the descaling pass is 5 times;

[0048] 4) The intermediate billet does not stop on the roller table between rough rolling and finishing rolling, and the heat preservation cover is used to ensure the temperature uniform...

Embodiment 3

[0055] Rolling 3.0×1250mm hot-rolled low-carbon steel without pretreatment and direct forming. The thickness of the continuous casting slab is 230mm, the width of the slab is 1450mm, the length of the slab is controlled at 9.9m, and the surface of the slab has no defects.

[0056] 1) Firstly, the chemical composition by weight percentage is: C: 0.08%, Si: 0.05%, Mn: 0.01%, S: 0.001%, and the rest is iron and unavoidable impurities, followed by molten iron desulfurization, converter blowing, argon blowing, refining, continuous casting;

[0057] 2) Slab heating, the heating temperature is 1300℃, and the heating time is 100min;

[0058] 3) Rough rolling, the exit temperature of rough rolling is 1020°C; the rough rolling pass is 8 times, and the descaling pass is 3 times;

[0059] 4) The intermediate billet does not stop on the roller table between rough rolling and finishing rolling, and the heat preservation cover is used to ensure the temperature uniformity of the head and tai...

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Abstract

The invention discloses pretreatment-free directly formed hot rolled low carbon steel, which is characterized by comprising the following chemical compositions in percentage by weight: 0.01 to 0.08 percent of C, 0.01 to 0.05 percent of Si, 0.01 to 0.50 percent of Mn, less than or equal to 0.010 percent of S, less than or equal to 0.015 percent of P and the balance of iron and inevitable impurities; and moreover, the scale on the surface of the steel mainly comprises 80 to 95 percent of Fe3O4. According to the method, by optimizing a plate blank heating and rolling process and controlling cooling water quality, the production cost is low. By the pretreatment-free directly formed hot rolled low carbon steel, the original acid-washing pretreatment can be eliminated, the phosphating and painting are not affected after the steel plate is punched and formed, the emission of waste acid is reduced, production procedures are simplified, the production cost is reduced, energy consumption is reduced, the environment is protected, the economic benefit of an enterprises is improved and the competitiveness of the enterprise is improved.

Description

technical field [0001] The invention belongs to the technical field of production of hot-rolled strips, and specifically refers to a pretreatment-free direct forming hot-rolled low-carbon steel and a manufacturing method thereof. Background technique [0002] With the development of the national economy, the country has stricter and stricter requirements on environmental protection, and put forward the requirement of "energy saving and emission reduction", which has higher and higher requirements on steel products. Iron oxide scale control of hot-rolled steel products is on the agenda. The hot-rolled low-carbon steel used in forming generally adopts pickling plate, that is, the produced hot-rolled low-carbon steel coil is first pickled, then slit, and then stamped and formed. [0003] Taking the existing compressor shell production as an example, the main process is as follows: [0004] Pickling of hot-rolled low-carbon steel coils → pickling sheet cutting → stamping formi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04B21B37/00B21B37/74
Inventor 韩斌蒋扬虎杨奕刘洋谭文汪水泽陈丽娟汪荣
Owner 武钢集团有限公司
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