8B cold-rolling precision steel belt and manufacturing method thereof

A manufacturing method and technology for steel strips, which are applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of unstable product performance, complex process flow, surface quality of thickness difference, etc., to improve spot welding processability, The surface texture is uniform and fine, and the fluctuation of the tolerance strip is small.

Active Publication Date: 2015-12-30
宝武轻材(武汉)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an 8B cold-rolled precision steel strip and its manufacturing method, which solves the technical problems of complex technological process, unstable product performance, plate shape, thickness difference and low surface quality in the prior art; Cost, improve product quality stability, improve plate shape, uniform thickness difference, and improve the technical effect of surface quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: In this example, the hot-rolled pickled coil with the brand name SPHC is selected, the specification is 2.5*1250mm, and the mass percentage of raw materials is: 0.045% of C, 0.010% of Si, 0.18% of Mn, 0.008% of S, 0.012% P, 0.036% Alt, and the rest are iron and unavoidable impurities. The size of slitting is 2.5*850mm, and it is cold-rolled on a high-precision six-roll reversing rolling mill with a total reduction rate of 82.8%. The time is 10 hours, after being out of the furnace, the elongation rate is 6.9%, and the surface roughness of the polishing roller is Ra0.04um, and then the strips are cut on the precision edger to obtain the finished product.

[0051] The main technical indicators of the products obtained by the above process: Hardness: HRB60.9; Elongation: 45%; Thickness: 0.40±0.010mm; Width: 70±0.05mm; Surface roughness Ra: 0.12um.

Embodiment 2

[0052] Example 2: In this example, the hot-rolled pickled coil with the brand name SPHC is selected, the specification is 3.0*1280mm, and the mass percentage of raw materials is: 0.05% of C, 0.01% of Si, 0.17% of Mn, 0.01% of S, 0.013% P, 0.030% Alt, and the rest are iron and unavoidable impurities. The size of the slitting cut is 3.0*805mm, cold rolling is carried out on a high-precision six-roll reversing rolling mill, the total reduction rate is 71.3%, and after electrolytic degreasing, the heat preservation temperature is 600°C in a nitrogen-hydrogen protective cover furnace. The time is 10 hours, after being out of the furnace, the elongation rate is 8.0%, and the surface roughness of the polishing roller is Ra0.03um, and then the strips are cut on the precision edger to obtain the finished product.

[0053] The main technical indicators of the products obtained by the above process: Hardness: HRB62.4; Elongation: 46%; Thickness: 0.80±0.015mm; Width: 61±0.05mm; Surface ro...

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Abstract

The invention belongs to the technical field of manufacturing of strip steel and discloses a manufacturing method of an 8B cold-rolling precision steel belt. The manufacturing method comprises the following steps: carrying out sizing vertical shearing on a raw material steel coil; carrying out cold rolling on the vertically-sheared steel coil; degreasing the coldly-rolled steel coil, and carrying out bright whole-soft-cover type annealing; carrying out small-ductility flattening on the annealed steel coil and carrying out large-ductility oil flattening and tempering; splitting the flattened steel coil to obtain the cold-rolling precision steel belt, wherein the raw material steel coil is a hot-rolling acid washing coil, and is prepared from the following components in mass percent: 0.02 to 0.055 percent of carbon, 0.002 to 0.30 percent of silicon, 0.0120 to 0.20 percent of manganese, less than or equal to 0.025 percent of phosphorus, less than or equal to 0.09 percent of aluminum and the balance of iron and unavoidable impurities, and the equivalent weight of the carbon of the acid washing coil is not more than 0.30 percent, the thickness range is 2.5mm to 3.5mm, and the width range is 1250mm to 1280mm. According to the manufacturing method provided by the invention, a technical process from material selection to cold rolling is optimized, the quality is improved and the performance requirements of products are adapted.

Description

technical field [0001] The invention relates to the technical field of steel strip manufacturing, in particular to an 8B cold-rolled precision steel strip and a manufacturing method thereof. Background technique [0002] Cold-rolled precision strip steel is widely used in various industries due to its excellent shape and surface quality and high dimensional accuracy, among which 8B steel strip is widely used in stationery, jewelry, optoelectronics and other industries. [0003] 8B cold-rolled precision steel strip is used as the base material of stationery, jewelry, and optoelectronic materials, and the products are produced after stamping, local secondary deformation, welding, electroplating, and packaging. Among them, the stamping process is continuously produced on a high-speed punching machine, which requires high dimensional accuracy and plasticity of the steel strip; 80% of the steel strip after electroplating is the direct viewing area, which requires high surface qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B37/56B21B37/28B21B45/02C22C38/06C21D1/26C21D9/56
CPCB21B1/22B21B37/28B21B37/56B21B45/0269B21B2001/221C21D1/26C21D9/56C22C38/06
Inventor 匡伟刘勇熊明松毛跃荣彭大凡王丹张兆丽杜祥生王勇
Owner 宝武轻材(武汉)有限公司
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