Rolling technology of producing pipeline steel of extreme specifications through wide-heavy plate mill

A limit specification and plate rolling mill technology, applied in the field of steel rolling, can solve the problems of steel plate performance fluctuation, high scrap rate, poor plate shape, etc., achieve control of finishing rolling speed, high rolling hit rate and yield, and solve plate shape problems Effect

Active Publication Date: 2016-06-15
SHOUGANG CORPORATION
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a rolling process for the production of limit specification pipeline steel by wide and heavy plate rolling mills, which solves the problems of poor plate shape, high scrap rate and performance fluctuation of steel plates that are easily occurred in the production of existing thin gauge pipeline steel

Method used

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  • Rolling technology of producing pipeline steel of extreme specifications through wide-heavy plate mill
  • Rolling technology of producing pipeline steel of extreme specifications through wide-heavy plate mill

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Select 1 piece of X65 pipeline steel, the thickness of the finished product is 8.8mm, and 10 pieces of 10mm thick steel plate have been rolled before rolling the target steel plate and the cooling water of the roller table is closed. The specific rolling process system of X65 is as follows:

[0017] (1) Dimensions of continuous casting slab: 150 thick * 1400 wide * 2700 long, rough plate size after rolling 8.8 thick * 2319 wide * 27665 long.

[0018] (2) The billet heating temperature is 1200°C, and the temperature of the upper and lower surfaces of the billet is 1213°C. The starting temperature of rough rolling is 1180°C, and the finishing temperature is 915°C.

[0019] (3) The total number of rolling passes is 14, the thickness of the intermediate billet is 50mm, and the number of finishing rolling is 7. The rolling procedures and parameters of the last 3 passes of the finishing rolling stage are shown in Table 1 below.

[0020] Table 1 The rolling schedule and param...

Embodiment 2

[0026] Select 1 piece of X65 pipeline steel, the thickness of the finished product is 10mm, and 12 pieces of 11.5mm thick steel plates have been rolled before rolling the target steel plate and the cooling water of the roller table is closed. The specific rolling process system of X65 is as follows:

[0027] (7) Continuous casting slab size: 180 thick * 1800 wide * 3180 long, the rough plate size after rolling is 10 thick * 2626 wide * 38501 long.

[0028] (8) The billet heating temperature is 1205°C, and the upper and lower surface temperatures of the billet are 1213°C and 1210°C respectively. The starting temperature of rough rolling is 1170°C, and the finishing temperature is 870°C.

[0029] (9) The total number of rolling passes is 12, the thickness of the intermediate billet is 40 mm, and the number of finishing rolling passes is 6. The rolling procedures and parameters of the last 3 passes of the finishing rolling stage are shown in Table 2 below.

[0030] Table 2 The r...

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Abstract

The invention discloses a rolling technology of producing pipeline steel of extreme specifications through a wide-heavy plate mill and belongs to the technical field of steel rolling. The rolling technology comprises the steps of selecting reasonable blanks with the thickness ranging from 150 mm to 200 mm; increasing the heating temperature, improve finish rolling temperature control, optimizing the rolling schedule, adjusting cooling water distributed on roller bodies, accelerating the rolling pace, controlling the finish rolling speed to range from 4 m / s to 7 m / s, improving the straightening technology and making reasonable rolling plans. The rolling technology has the advantages that the strip shape problem of the thin-specification pipeline steel is effectively solved, the rolling hit rate and the yield are high, and qualified products can be stably produced in a batched mode.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a rolling process for producing limit specification pipeline steel by a wide and thick plate rolling mill. In particular, it relates to a rolling process for producing pipeline steel with a thickness of 7-10 mm and a thin specification by using a 4300 mm double-stand wide and thick plate rolling mill. Background technique [0002] Thin-gauge pipeline steel plates are usually produced on hot rolling mills and used after Kaiping treatment. However, for pipeline steel for regional urban pipeline networks and some special-purpose pipeline steel, it is often required to be flat and the thickness of the steel plate is relatively thin. It is difficult to guarantee the shape of the coiled plate after being flattened, and the narrow width of the coiled plate often results in a large amount of welding and high cost. The stress is large and unevenly distributed. At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B37/16B21B37/74B21B37/76B21B37/58
CPCB21B1/22B21B37/16B21B37/58B21B37/74B21B37/76B21B2261/04B21B2271/02
Inventor 张海李少坡丁文华李战军马长文
Owner SHOUGANG CORPORATION
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