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A hot continuous rolling production method of thick specification x70 pipeline steel coil

A production method and steel coil technology, applied in metal rolling, metal rolling, workpiece heating devices, etc., can solve problems such as surface scratches, rolling instability, etc., to eliminate loose coils and ensure the exit temperature of rolling , Reduce the effect of left and right movement

Active Publication Date: 2021-11-30
SHAGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a hot continuous rolling production method of thick gauge X70 pipeline steel coils, which is used to solve rolling instability caused by thick gauge pipeline steel buckles, surface scratches, wrong sides of coiling, tower shape, loose coils, etc. question

Method used

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  • A hot continuous rolling production method of thick specification x70 pipeline steel coil
  • A hot continuous rolling production method of thick specification x70 pipeline steel coil

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The slab transport device 10 is transported in the heating furnace 20 to the heating furnace 20, the heating furnace 20 having a number of ≥ 10 blocks, the After the opening of the rolling transition material, after the heating furnace 20, a slab (naturally cooled) of a temperature below 300 ° C is then transported to the heating furnace 20.

[0049]In step one, the steel temperature is controlled below 300 ° C, and the purpose is to prevent the heat stress of the steel blank to generate thermal cracks. Before the billet enters the heating furnace 20, it is first loaded into the open-rolled transduction material, and the number is specified to be ≥10 blocks. It is an object to be a hot roller, a preheated roll, which makes the roll in a preferred state, improve the rolling line. Stability of finishing rolling rolling during steel. After the heating of the heating furnace 20, when the furnace is released, the temperature difference of the same plate is within 20 ° C and the ...

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Abstract

The invention relates to a hot continuous rolling production method of thick gauge X70 pipeline steel coils, which comprises flying shears, 7 finishing mills, a laminar flow cooling device, and a coiler. The coiler includes side guide plates arranged in sequence according to the technological process, The upper pinch roller, the lower pinch roller and the mandrel provided with a plurality of roll-helping rollers are arranged next to each other. By adopting the total pressure control and position control mode for the side guide plate of the coiler, the pinch roller adopts the position mode to the total pressure control mode and then switches to the position control mode, increases the lead rate of the pinch roller, the mandrel and the coiling roll, and after throwing steel Establish micro-tension at the tail of the strip to improve the coil quality of the strip; prevent the strip from buckling by controlling the nip rolling force, rolling line height and roll diameter difference in the finish rolling; roll through the flying shear head , Control the uncooled section of the head to prevent surface scratches caused by coiling slippage. The invention can effectively solve the problem of rolling instability caused by thick-gauge pipeline steel buckle heads, scratches on the surface, poor roll shape, etc., and has good economic and social benefits.

Description

Technical field [0001] The present invention belongs to the field of rolling and rolling rolling technology, and in particular, the present invention relates to a thermal joint production method of thick-specific X70 pipeline steel coils. Background technique [0002] The X70 pipeline steel is widely used in oil, natural gas delivery, generally using a hot-rolled steel roll spiral annulus welding or use a wide plate straight sewing arc welding. The X70 pipeline steel roll thickness is large, high strength, low volume temperature, long production line, fast rhythm, high-efficiency and equipment for the hot rolling production line, which is very difficult, which is very difficult, mainly reflected in: [0003] (1) Thick-specific pipeline steel is continuously irreversible rolling through seven finishing mills, and it is easy to have a knot problem. [0004] (2) Lamination cooling adopts quenched and low target roll temperature, easy to cool, resulting in poor strip-shaped plate sha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/22B21B45/00B21B45/04B21B15/00B21B45/02B21C47/34
CPCB21B1/22B21B15/0007B21B45/004B21B45/0218B21B45/04B21B2001/225B21B2015/0057B21B2261/20B21C47/3433
Inventor 刘海华丁美良张长贵潘景明
Owner SHAGANG GROUP
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