65 Mn cold-rolled wide steel strip manufacturing process

A manufacturing process and technology of steel strip, applied in the field of manufacturing process of 65Mn cold-rolled wide steel strip, can solve the problems of low level of automation control of rolling mill, large metal deformation resistance, and difficult control of plate shape, etc. The effect of eliminating welding stress and ensuring uniformity

Active Publication Date: 2018-02-02
新余钢铁股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manufacturing process of 65Mn narrow strip steel is produced by a small four-high reversing mill or six-high reversing mill with a single stand. During rolling, uncoiling, strip threading, and speed reduction are required. The automatic control level of the rolling mill is low and the production efficiency is low.
Because 65Mn has high hardness, high strength, large metal deformation resistance, difficult control of plate width and plate shape, and is not easy to weld, it is easy to produce many technical problems such as weld strip breakage, rolling load exceeding the motor load limit, etc.

Method used

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  • 65 Mn cold-rolled wide steel strip manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present invention selects the steel grade of the hot-rolled coil raw material as 65Mn, the raw material specification is 3.00mm×1100mm, and the finished product specification after cold rolling is 1.8×1100mm. The following process steps are used:

[0029] (1) The 65Mn hot-rolled steel coil with a raw material thickness of 3.00 mm is hoisted into a special slow-cooling pit for slow cooling for 60 hours after hot-rolling to eliminate internal stress and improve the hardness uniformity of the 65Mn hot-rolled steel coil. After the set slow cooling time is reached, the temperature of the steel coil is detected at 40°C, and the coil is taken out of the pit and sent to the raw material warehouse of the cold rolling factory for storage;

[0030] (2) The pickling unit production line of continuous pickling + five-stand six-high cold tandem rolling unit is used to coil, level and cut the 65Mn hot-rolled coil raw materials. After cutting, laser welding is used to separate the ...

Embodiment 2

[0036] The present invention selects the steel type of the hot-rolled coil raw material as 65Mn, and the raw material specification is 2.75mm×1150mm. After cold rolling, the finished product specification is 1.5×1150mm. The following process steps are used:

[0037] (1) The 65Mn hot-rolled steel coil with a raw material thickness of 2.75 mm is hoisted into a special slow-cooling pit for slow cooling for 48 hours after hot-rolling. Storage of raw materials in rolling mills;

[0038](2) The pickling unit production line of continuous pickling + five-stand six-high cold tandem rolling unit is used to coil, level and cut the 65Mn hot-rolled coil raw materials. After cutting, laser welding is used to separate the front and rear The steel coil is welded, the welding steel strip speed is 3.3-3.6m / min, and the welding input power is 10.0-10.5KW. The preferred welding speed is: 3.5m / min, and the corresponding welding power is 10.2KW.

[0039] (3) After the joints of two steel coils...

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Abstract

The invention discloses a 65 Mn cold-rolled wide steel strip manufacturing process. The 65 Mn cold-rolled wide steel strip manufacturing process comprises the steps that 65 Mn raw materials are slow-cooled for 48 h and then sent to a cold rolling factory; an acid rolling combined unit production line is used, after heat cutting is conducted on the 65 Mn raw materials, welding is conducted, the speed of welding a steel strip is 3.3-3.6 m / min, the welding input power is 10.0-10.5 KW; a welding seam area of a joint is heated and annealed, the annealing temperature is 620-650 DEG C, the annealingtime is 50-60 s, and then dephosphorizing and acid pickling are conducted; the cold rolling total downward pressing amount is controlled to be 35-50%, the downward pressing rate of a first rack S1 is9-15%, and the rolling force is 10-18 MN; the downward pressing rate of a second rack S2 is 10-17%, and the rolling force is 10-18 MN; the downward pressing rate of a third rack S3 is 10-17%, and therolling force is 10-18 MN; the downward pressing rate of a fourth rack S4 is 8-13%, and the rolling force is 10-18 MN; the downward pressing rate of a fifth rack S5 is 1.5-5%, and the rolling force is4-7 MN; and after five times continuous rolling is conducted, the finished product thickness is formed by rolling, and coiling for warehousing is conducted after rolling is finished. By means of the65 Mn cold-rolled wide steel strip manufacturing process, continuous and steady rolling of the 65Mn cold-rolled wide steel strip on the acid rolling combined unit is achieved.

Description

technical field [0001] The invention relates to the technical field of metal material forming, in particular to a manufacturing process of a 65Mn cold-rolled wide steel strip. Background technique [0002] 65Mn is a high-carbon high-manganese steel, with a carbon content of 0.62% to 0.70%, a manganese content of 0.90% to 1.20%, high hardness and high strength, and a tensile strength above 900MP. 65Mn cold-rolled steel strip is widely used in many manufacturing industries such as automobiles, hardware, saw blades, knives, springs, etc. due to its excellent comprehensive mechanical properties, and has a large market demand. At present, most of the market supply is 65Mn narrow strip steel with a width of less than 600mm, which cannot meet the market demand in the width direction. The manufacture of 65Mn narrow strip steel and 65Mn wide steel strip is a completely different process. The manufacturing process of 65Mn narrow strip steel adopts a single-stand small four-high reve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/36B21B37/58B21C37/00
CPCB21B1/36B21B37/58B21B2271/02B21C37/00
Inventor 吕瑞国冯小明喻建林胥建平王振基钟海清唐小勇王婷华杨同利阮细保杨帆钟小杰刘志芳黄珍
Owner 新余钢铁股份有限公司
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