4B cold-rolled precise steel strip 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: 2016-01-13
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 a 4B 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

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Comparison scheme
Effect test

Embodiment 1

[0053] 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: 0.055% of C, 0.011% of Si, 0.23% of Mn, 0.009% of S, 0.011% P, 0.033% Alt, and the rest are iron and unavoidable impurities. The size of slitting is 2.5*775mm. It is cold-rolled on a high-precision six-high reversing rolling mill with a total reduction rate of 82.0%. The time is 10 hours. After being out of the furnace, it is pre-leveled with a small elongation of 5.5%, and then oil-leveled and tempered with a large elongation of 17.6%. Get finished product specifications.

[0054] The main technical indicators of the products obtained by the above process: Hardness: HRB78.7; Elongation: 17%; Thickness: 0.35±0.010mm; Width: 76±0.05mm; Surface roughness Ra: 0.12um.

Embodiment 2

[0055] Example 2: In this example, hot-rolled pickled coils with the brand name of SPHC are selected, the specification is 3.0*1280mm, and the mass percentages of raw materials are: 0.058% C, 0.012% Si, 0.25% Mn, 0.009% S, 0.015% P, 0.029% Alt, and the rest are iron and unavoidable impurities. The size of the slitting cut is 3.0*785mm, and it is cold rolled on a high-precision six-high reversing rolling mill with a total reduction rate of 79.16%. The time is 10 hours. After being out of the furnace, pre-leveling with a small elongation of 5.6% is carried out, and then a large elongation of 15.2% is oil leveled and tempered. The surface roughness of the polishing roller is Ra0.03um. Finished specification product.

[0056] The main technical indicators of the products obtained by the above process: Hardness: HRB76.6; Elongation: 19%; Thickness: 0.50±0.015mm; Width: 55±0.05mm; Surface roughness Ra: 0.18um.

[0057] One or more technical solutions provided in the embodiments of...

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Abstract

The invention belongs to the technical field of strip steel manufacturing, and discloses a manufacturing method of a 4B cold-rolled precise steel strip. The manufacturing method comprises the steps of conducting fixed-length longitudinal shearing on raw steel coils, conducting cold rolling on the longitudinally-sheared steel coils, degreasing the cold-rolled steel coils, then conducting bright fully-soft cover annealing, conducting small-ductility pre-flattening and then large-ductility oil flattening and hardening and tempering on the annealed steel coils, and splitting the flattened steel coils to obtain cold-rolled precise strip steel. The raw steel coils are hot-rolled acid-pickled coils and comprise, by mass, 0.025%-0.060% of carbon, 0.002%-0.35% of silicon, 0.015%-0.250% of manganese, 0-0.025% of phosphorus, 0-0.09% of aluminum, and the balance iron and inevitable impurities; the carbon equivalent of the acid-pickled coils is not larger than 0.35%, the thickness ranges from 2.5 mm to 3.5 mm, and the width ranges from 1250 mm to 1280 mm. According to the manufacturing method, the process from material selection to cold rolling is optimized, the quality is improved, and the performance requirement of products is met.

Description

technical field [0001] The invention relates to the technical field of steel strip manufacturing, in particular to a 4B 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 4B steel strip is widely used in stationery, jewelry, optoelectronics and other industries. [0003] 4B 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 qual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B37/00B21B37/16C22C38/06C22C38/04
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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