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Prediction method of edge wave generation after cold rolling of low carbon steel

A prediction method and low-carbon steel technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as poor batch shape, affecting cold rolling production plan and logistics, and inability to check in advance, so as to avoid plate Shape quality loss, strong enforceability, optimized hot rolling process control effect

Active Publication Date: 2016-07-27
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the above existing problems, the present invention discloses a method for predicting edge chipping in cold rolling of low-carbon steel, which mainly solves the problem of randomly occurring edge chipping in cold rolling production of thin-gauge low-carbon steel and cannot be checked in advance. , leading to the problem that the bad shape of the batch affects the production plan and logistics of cold rolling

Method used

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  • Prediction method of edge wave generation after cold rolling of low carbon steel
  • Prediction method of edge wave generation after cold rolling of low carbon steel
  • Prediction method of edge wave generation after cold rolling of low carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In the production plan issued by the cold rolling mill, there is a certain coil 7676020300, and the steel type of this coil is DQ0650K1. The specific implementation steps are:

[0040] 1) Read data

[0041] The weight percentage of the main alloy chemical composition of this volume is C: 0.0355%, Mn: 0.2796%, Cu: 0.0212%, Cr: 0.0148%, Ni: 0.0092%, Ti: 0.0004%, Al: 0.0492%. The thickness t of the coil is 2.2mm, the width b is 975mm, the C content of the coil is ≤0.15%, and the thickness ∈ [1.8mm, 2.5mm], it belongs to thin-gauge low-carbon steel;

[0042] 2) Calculate the A of the material r3 =870-440ω(C)-80ω(Mn)-20ω(Cu)-15ω(Cr)-55ω(Ni)-15ω(Ti)-25ω(Al)+0.35*(t-8)=827℃

[0043] 3) According to figure 2 According to the final rolling temperature curve data of the material, the lowest point of the final rolling temperature in the middle of the material is judged to be 837°C, and the obtained data point is located at about 95m from the head of the coil;

[0044] 4) Acc...

Embodiment 2

[0051] In the production plan issued by the cold rolling mill, there is a certain coil 68041020200, and the steel type of this coil is DP1451K1. The specific implementation steps are:

[0052] 1) Read data

[0053] The weight percentage of the main alloy chemical composition of this volume is C: 0.0555%, Mn: 0.2331%, Cu: 0.0202%, Cr: 0.0143%, Ni: 0.0088%, Ti: 0.0009%, Al: 0.0210%. The thickness t of the coil is 2.0mm, the width b is 780mm, the C content of the coil is ≤0.15%, and the thickness ∈ [1.8mm, 2.5mm], it belongs to thin-gauge low-carbon steel;

[0054] 2) Calculate the A of the material r3 =870-440ω(C)-80ω(Mn)-20ω(Cu)-15ω(Cr)-55ω(Ni)-15ω(Ti)-25ω(Al)+0.35*(t-8)=823℃

[0055] 3) According to image 3 According to the final rolling temperature curve data, it is judged that the lowest point of the final rolling temperature in the middle of the material is 841°C, and the obtained data point is about 110m from the head of the coil;

[0056] 4) According to the thickne...

Embodiment 3

[0063] In the production plan issued by the cold rolling mill, there is a certain coil 6279020300, and the steel type of this coil is AQ0940K1. The specific implementation steps are:

[0064] 1) Read data

[0065] The weight percentage of the main alloy chemical composition of this volume is C: 0.0422%, Mn: 0.2456%, Cu: 0.0251%, Cr: 0.0168%, Ni: 0.0099%, Ti: 0.0005%, Al: 0.0355%. The thickness t of the coil is 2.3mm, the width b is 1075mm, the C content of the coil is ≤0.15%, and the thickness ∈ [1.8mm, 2.5mm], it belongs to thin-gauge low-carbon steel;

[0066] 2) Calculate the A of the material r3 =870-440ω(C)-80ω(Mn)-20ω(Cu)-15ω(Cr)-55ω(Ni)-15ω(Ti)-25ω(Al)+0.35*(t-8)=828℃

[0067] 3) According to Figure 4 According to the final rolling temperature curve data of the material, it is judged that the lowest point of the final rolling temperature in the middle of the material is 852°C, and the obtained data point is about 80m from the head of the coil;

[0068] 4) Accordin...

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Abstract

The invention relates to a prediction method of edge wave generation after cold rolling of low carbon steel. A raw sheet of the low carbon steel comprises the following chemical compositions: C and other alloy elements, wherein the weight percentage of C is less than or equal to 0.15%; thickness range of hot rolling is 1.8-2.5mm, the width range is 700-1300mm, and the thickness range of cold rolling is 0.18-0.25mm; the lowest finishing temperature of edge parts of the low carbon steel is determined in order to judge whether rolling may enter a two-phase region, and whether the thickness jumping amount of the parts exceeds an amplitude limiting is auxiliary, so that whether edge waves are generated after cold rolling is predicated, and production plans can be prepared in advance. The prediction method can be used for accurately identifying latent defects of hot rolling, defects can be prevented and controlled in advance, and the problems that edge wave defects are discovered after cold rolling in prior art and repair needs to be carried out after cold rolling are effectively solved.

Description

technical field [0001] The invention relates to a prediction method, in particular to a method for predicting chipping waves in cold rolling of low-carbon steel, and belongs to the technical field of shape control of cold-rolled steel strips. Background technique [0002] Tinplate, commonly known as "tinplate", refers to the cold-rolled low-carbon thin steel plate coated with pure tin on the surface. It has the strength and formability of the base steel plate, as well as the corrosion resistance, weldability and aesthetics of the surface tin. It is a very good packaging material, which is widely used in food cans, beverage cans, spray cans and other container fields. [0003] As various industries reduce costs and increase efficiency, the demand for the thickness of tinplate raw materials is also constantly decreasing, from about 0.3mm to 0.25mm and 0.22mm, and now it has dropped to below 0.20mm. In order to ensure the formability and strength of the material, it can only b...

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D11/00
Inventor 陈维晋何小丽刘云峰刘洪曹博蕊
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD