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Superfine crystal particle hot-rolling steel plate with thick specification and production thereof

A technology of ultra-fine grain and hot-rolled steel plates, applied in metal rolling and other directions, can solve the problems of difficult process control, high price of alloy elements, high price, etc., and achieve the effect of good comprehensive performance, good cold bending performance and low cost

Inactive Publication Date: 2005-05-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively high price of alloying elements, the price of this steel is relatively high, and the process control is also difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Converter smelting Q235 plain carbon steel, the chemical composition of steel includes: C: 0.13%, Si: 0.22%, Mn: 0.52%, P: 0.018%, S: 0.010%. The steel is cast into 200×(800~1200)×5500mm continuous casting slabs by conventional continuous casting methods, and the slabs are sent to a 1450mm hot continuous rolling mill for rolling. The whole process of heating, rolling and cooling is controlled. The rolling process control is as follows:

[0011] a. Control the continuous casting slab heating temperature to 1180°C; b. Rough rolling of the slab at 970°C, using six passes for rough rolling; c. The thickness of the intermediate slab after rough rolling is 31mm; d. Hot rolling and finishing rolling The inlet temperature is 890°C; e, the finishing rolling is carried out with six stands; f, the cooling water is put into three sets of stands; g, the exit temperature of hot rolling and finishing rolling is 810°C; h, the coiling temperature is 540°C.

[0012] The produced hot-rol...

Embodiment 2

[0014] Converter smelting Q235 plain carbon steel, the chemical composition of steel includes: C: 0.15%, Si: 0.25%, Mn: 0.61%, P: 0.015%, S: 0.008%. The steel is cast into 200×(800~1200)×5500mm continuous casting slabs by conventional continuous casting methods, and the slabs are sent to a 1450mm hot continuous rolling mill for rolling. The whole process of heating, rolling and cooling is controlled. The rolling process control is as follows:

[0015] a. Control the continuous casting slab heating temperature to 1200°C; b. Rough rolling of the slab at 980°C; c. The thickness of the intermediate slab after rough rolling is 34.5mm; d. The entrance temperature of hot rolling and finishing rolling is 910°C; e , Finish rolling is carried out with five stands; f, cooling water is put into four sets of stands; g, the exit temperature of hot rolling and finishing rolling is 830°C; h, the coiling temperature is 520°C.

[0016] The thickness of the produced hot-rolled steel plate is 7....

Embodiment 3

[0018] Converter smelting Q235 plain carbon steel, the chemical composition of steel includes: C: 0.17%, Si: 0.25%, Mn: 0.68%, P: 0.015%, S: 0.009%. The steel is cast into 200×(800~1200)×5500mm continuous casting slabs by conventional continuous casting methods, and the slabs are sent to a 1450mm hot continuous rolling mill for rolling, and the whole process of heating, rolling and cooling is controlled. The hot rolling process is controlled as follows:

[0019] a. Control the continuous casting slab heating temperature to 1200°C; b. Rough rolling of the slab at 980°C; c. The thickness of the intermediate slab after rough rolling is 35.5mm; d. The entrance temperature of hot rolling and finishing rolling is 920°C; e , Finish rolling is carried out with five stands; f, cooling water is put into four groups of stands; g, the exit temperature of hot rolling and finishing rolling is 830°C; h, the coiling temperature is 500°C.

[0020] The thickness of the produced hot-rolled stee...

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PUM

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Abstract

The invention was involved in the preparation method of thick hot rolled steel plate with ultra-fine grain. The alloy consist of 0.13-0.18%C, 0.12-0.30% Si, 0.50-0.70%Mn, is less than or equal to 0.020% P and is less than or equal to 0.015%S. The technology included the following steps: a) the heating-up temperature of continuous cast ingot was 1150-1200deg.C. b) The temperature of coarse crushing was 950-1000deg.C. c) The thickness of intermediate ingot after coarse crushing was 30-35mm. d) Inlet temperature of fine rolling was 880-920deg.C. e) Five or six groups frameworks were used in the rolling process of fine rolling. f) Three or four groups cooling water were input among the frameworks. g) Outlet temperature of fine rolling was 800-830deg.C. h) The reel temperature was 500-560deg.C. Chemical constitution of the hot rolling steel plate was simple and the cost was low. Ultra-fine grain hot rolling steel plate with 6.5-8.0mm thick was formed by controlling heating, coarse rolling and cooling. The steel plate had fine strength of extension, yield strength, extensibility and cold bending performance.

Description

technical field [0001] The invention relates to a steel plate and its production process, in particular to a thick gauge hot-rolled steel plate with ultrafine grains and its production process. Background technique [0002] For Q235 plain carbon steel, on the traditional hot rolling mill, the conventional rolling process is used for rolling, that is: the heating temperature is 1250°C, the rough rolling temperature is 970°C, the finish rolling entrance temperature is 950°C ~ 1000°C, and the exit temperature is 1000°C. The temperature is 850°C-920°C, the coiling temperature is 670°C-700°C, the mechanical properties of the produced steel plate are: yield strength ReL: 235MPa-300MPa, tensile strength Rm: 375MPa-500MPa. For a hot-rolled steel plate with a thicker thickness (eg, 6.5 mm to 8.0 mm in thickness), it is more difficult to increase the strength of the steel plate by using the conventional rolling process described above. In addition, in order to improve the strength of...

Claims

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Application Information

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IPC IPC(8): B21B1/22B21B1/46C21D8/02C22C38/04
Inventor 宋立秋左军佘广夫程兴德刘勇刘建华
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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