65 Mn cold-rolled wide steel strip manufacturing process

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...

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.

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