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SPHC cold-rolled edge cracking eliminating method

A technology of edge cracks and edge parts, applied in the field of eliminating edge cracks in SPHC cold rolling, can solve the problem of high cost, achieve the effect of reducing hot rolling coiling temperature, eliminating cold rolling edge cracks, and increasing hot rolling finishing temperature

Active Publication Date: 2014-01-01
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for eliminating edge cracks in SPHC cold rolling, which solves the problem of high cost in the existing method of eliminating SPHC edge cracks in cold rolling by intermediate annealing

Method used

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  • SPHC cold-rolled edge cracking eliminating method
  • SPHC cold-rolled edge cracking eliminating method
  • SPHC cold-rolled edge cracking eliminating method

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specific Embodiment

[0038] The method for eliminating SPHC cold-rolled edge crack that the embodiment of the present invention provides, wherein, the main component of SPHC is as follows table 1:

[0039] Table 1

[0040]

[0041] In Table 1, "judgment" is mainly applicable to the grasp of the composition of the steelmaking production. As long as the composition of the slab for steelmaking is within this range, it can be released, and the slab will enter the hot rolling process; Decided to resmelt or switch to other steel grades. The target value of slab smelting is the desired value. Although the judgment range is very wide, at the current level of each steel mill, the target achievement rate is relatively high. For example, for SPHC, the hit rate within the range of ±0.01 of the target can reach more than 90%. The purpose is to provide an ingredient system for the following examples. A carbon content of 0.06 is high-carbon SPHC, and a carbon content of 0.03 is low-carbon SPHC. The words...

Embodiment 1

[0045] The following table 2 uses different hot rolling processes to control SPHC at the final rolling temperature, and uses the same trimming process to track the edge cracking after cold rolling:

[0046] Table 2

[0047]

[0048] , It is easy to know from Table 2 that under the same process conditions, increasing the finishing temperature of hot rolling can avoid the problem of edge cracking of SPHC during cold rolling.

Embodiment 2

[0050] The following table 3 uses different hot rolling processes to control the coiling temperature of SPHC, and uses the same trimming process to track the edge cracking after cold rolling:

[0051] table 3

[0052]

[0053] , It is easy to know from Table 3 that under the same process conditions, reducing the hot-rolling coiling temperature can avoid the problem of edge cracking of SPHC during cold rolling.

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Abstract

The invention provides an SPHC cold-rolled edge cracking eliminating method. By controlling edges of SPHC at hot rolling and precision rolling stages within austenite single-phase rolling range, hot and finish rolling temperature is increased while hot rolling and coiling temperature is decreased. Problems that edge texture of the hot-rolled SPHC is rough, carbide bands seriously exist and crystal is mixed are solved, and cold-rolled edge cracking of the SPHC is eliminated.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for eliminating edge cracks in SPHC cold rolling. Background technique [0002] As a cold-rolled base material, SPHC is mainly used to manufacture and process parts that are easy to form and have low strength requirements, and require good stamping formability, tensile and bending properties. The composition control of this kind of steel is relatively simple, customers have a wide range of uses, and the market demand is large. [0003] The stability and reliability of cold-rolled products on the pass-through plate of each unit is the key to ensure the safe operation of each cold-rolled process and improve the operating rate, and the quality of the edge of the cold-rolled product determines the quality of the pass-through plate of each cold-rolled unit. Safety, among which the quality of cold and hard crimping is particularly important. Chilled coils are prone to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74
Inventor 于洋王畅陈瑾王林徐海卫李飞吴耐
Owner SHOUGANG CORPORATION
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