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Preparation method of hot-rolled strip steel easy to pickle

A hot-rolled strip, easy-to-pickling technology, used in metal rolling, metal rolling, manufacturing tools, etc., can solve the problem that iron oxide scale is not easy to pickle, so as to suppress the production amount, increase the temperature drop, and reduce the production amount of effect

Active Publication Date: 2019-06-28
TANGSHAN DELONG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for preparing a hot-rolled steel strip that is easy to pickle. The thickness of the iron oxide scale on the surface of the steel strip prepared by the method of the invention is less than or equal to 7 μm. During subsequent use, the iron oxide scale can be easily removed by pickling, effectively It solves the problem that the oxide scale on the surface of the steel strip is too thick and difficult to be pickled in the prior art

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  • Preparation method of hot-rolled strip steel easy to pickle
  • Preparation method of hot-rolled strip steel easy to pickle
  • Preparation method of hot-rolled strip steel easy to pickle

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preparation example Construction

[0022] The invention provides a kind of preparation method of easy pickling hot-rolled steel strip, comprises the following steps:

[0023] Heating, rough descaling, rough rolling, finishing descaling, finishing rolling and coiling are performed on the slab in sequence to obtain hot-rolled steel strips that are easy to pickle;

[0024] The heating includes heating stage one, heating stage two and soaking stage in sequence; the temperature of the heating stage one is 1190-1210°C, and the time is 20-27min; the temperature of the heating stage two is 1230-1250°C, and the time is 32 to 38 minutes; the temperature of the soaking section is 1270 to 1290°C, and the time is 33 to 40 minutes; the volume ratio of air to gas in the first heating section, the second heating section, and the soaking section is independently 0.8 to 1.0:1 ;

[0025] The hydraulic pressure of the rough descaling is 18~20MPa;

[0026] The rough rolling includes five successive rolling passes, specifically th...

Embodiment 1

[0047] The section size of the casting billet is 150mm*380mm, the temperature of the heating furnace is 1191°C, and the volume ratio of air to gas is 0.81:1; the temperature of the second heating stage is 1233°C, and the ratio of air to gas is 0.83; the temperature of the soaking zone is 1273°C, and the ratio of air to gas is 0.83. 0.88; heating time 103min. The descaling pressure of the rough descaling box is 18.28MPa, the inlet temperature of rough rolling is 1205℃, the thickness of the first pass of rough rolling is 122.5mm, the thickness of the second pass is 92.7mm, the thickness of the third pass is 62.6mm, and the thickness of the fourth pass is 62.6mm. The thickness of the exit of the pass is 42.3mm, the thickness of the exit of the fifth pass is 25.3mm, and the final rolling temperature of rough rolling is 1161 ℃. The descaling pressure of the finishing descaling box is 18.33MPa, the inlet temperature of finishing rolling is 1025℃, the exit thickness of the first pass...

Embodiment 2

[0050] The section size of the casting billet is 165mm*330mm, the temperature of the heating furnace is 1198°C, and the volume ratio of air to gas is 0.92:1; the temperature of the second heating stage is 1241°C, the ratio of air to gas is 0.95, the temperature of the soaking zone is 1282°C, and the ratio of air to gas is 1282°C. 0.96; heating time 91min. The descaling pressure of the rough descaling box is 19.18MPa, the inlet temperature of rough rolling is 1209℃, the thickness of the first pass of rough rolling is 125.5mm, the thickness of the second pass is 93.9mm, the thickness of the third pass is 63.7mm, and the thickness of the fourth pass is 63.7mm. The thickness of the exit of the pass is 43.4mm, the thickness of the exit of the fifth pass is 26.1mm, and the final rolling temperature of rough rolling is 1172°C. The descaling pressure of the finishing descaling box is 19.15MPa, the inlet temperature of finishing rolling is 1031℃, the exit thickness of the first pass of...

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Abstract

The invention provides a preparation method of hot-rolled strip steel easy to pickle, and belongs to the technical field of metallurgy. The preparation method of the hot-rolled strip steel easy to pickle comprises the following steps: sequentially heating, roughly descaling, roughly rolling, finely descaling, finely rolling and coiling a cast blank to obtain the hot-rolled strip steel easy to pickle. According to the preparation method, the heating method of quick burning at high temperature is adopted, and combined with the reasonable ratio of air to gas and the large reduction amount of rough rolling, so that the thickness of oxidized scale on the surface of the strip steel prepared by the method is thin, and the problem that the oxidized scale on the surface of the strip steel is too thick to be easily pickled is effectively solved. The results of the examples show that the thickness of the oxidized scale on the surface of the hot-rolled strip steel produced by the method is smallerthan or equal to 7 [mu]m.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for preparing hot-rolled steel strips that are easy to pickle. Background technique [0002] Hot-rolled steel strips are used as raw materials, pickled to remove surface oxide scale, and then cold-rolled to specifications of different thicknesses. They are widely used in the fields of machinery manufacturing, hardware, and household appliances. [0003] Currently, the commercially available hot-rolled strip steel scale is relatively thick, and when used by downstream cold-rolling customers, a large amount of acid solution is required to remove the scale on the surface of the hot-rolled strip steel. With the continuous improvement of people's requirements for environmental protection, the control of the amount of acid is becoming more and more strict. Therefore, improving the ease of pickling of the oxide scale on the surface of the strip steel can reduce the amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/26B21B45/08B21B45/00
Inventor 梁鹏冯润壮马啸晨
Owner TANGSHAN DELONG STEEL CO LTD
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