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A control method for surface oxidation pitting defect of hot-rolled pickling plate

A hot-rolled pickling and surface oxidation technology, applied in contour control and other directions, can solve problems such as oxidation pitting defects, and achieve the effects of reducing the probability of occurrence, improving quality, and reducing rolling load of rolls

Active Publication Date: 2018-12-14
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiments of the present invention provide a method for controlling oxidation pitting defects on the surface of hot-rolled pickling sheets, which solves the problem of oxidation pitting defects in hot-rolled pickling sheets with a thickness of ≤2 mm and a tensile strength of ≥500 MPa in the prior art. Technical problems, reduced the probability of occurrence of oxidation pitting defects on hot-rolled pickled plates, and improved the quality of finished products of hot-rolled pickled plates

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  • A control method for surface oxidation pitting defect of hot-rolled pickling plate

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Embodiment 1

[0028] This embodiment provides a method for controlling oxidation pitting defects on the surface of a hot-rolled pickled plate, the thickness of the hot-rolled pickled plate is ≤2 mm, and the tensile strength is ≥500 MPa. The manufacturing process of the hot-rolled pickled plate is steel billet Heating, rough rolling, descaling, finish rolling and pickling. The method includes:

[0029] The chemical composition of the steel slab is controlled to contain Si: 0.06%, P: 0.008% in terms of mass percentage, and the rest is Mn, Nb, Ti and Fe matrix. Put the steel billet with a thickness of 200mm into the heating furnace for heating for 160min, control the temperature of the billet out of the furnace to 1200°C, and conduct rough rolling and high-pressure descaling water descaling treatment on the billet out of the furnace. 5 passes of rough rolling process, 3 passes of high-pressure descaling water descaling, for example, 1, 3 and 5 passes can be opened for high-pressure descaling ...

Embodiment 2

[0031] This embodiment provides a method for controlling oxidation pitting defects on the surface of a hot-rolled pickled plate, the thickness of the hot-rolled pickled plate is ≤2 mm, and the tensile strength is ≥500 MPa. The manufacturing process of the hot-rolled pickled plate is steel billet Heating, rough rolling, descaling, finish rolling and pickling. The method includes:

[0032] The chemical composition of the steel slab is controlled to contain Si: 0.1%, P: 0.006% in terms of mass percentage, and the rest is Mn, Nb, Ti and Fe matrix. Put the steel billet with a thickness of 200mm into the heating furnace for heating for 160min, control the temperature of the billet out of the furnace to 1200°C, and conduct rough rolling and high-pressure descaling water descaling treatment on the billet out of the furnace. 5 passes of rough rolling process, 3 passes of high-pressure descaling water descaling, for example, 1, 3 and 5 passes can be opened for high-pressure descaling w...

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Abstract

The invention relates to the technical field of hot rolling, in particular to a control method for surface oxidation pocking defects of a hot-rolled pickled plate. The control method includes the steps that the chemical components of a steel billet are controlled to include, by mass, 0.05-0.15% of Si, at most 0.01% of P and the balance Mn, Nb, Ti and a Fe substrate. In the heating process of the steel billet, the steel billet with the thickness being 135-250 mm is put into a heating furnace and heated for 160-200 min, and the tapping temperature of the steel billet is controlled to be 1180-1240 DEG C. The thickness of an intermediate billet is controlled to be 26-34 mm after a descaling process. In the precision rolling process, the precision rolling inlet temperature is controlled to be 980-1020 DEG C, and the finish rolling temperature is controlled to be 850-890 DEG C. The control method for surface oxidation pocking defects of the hot-rolled pickled plate can effectively restrain the occurrence of surface oxidation pocking defects of the hot-rolled pickled plate with the thickness being at most 2 mm and the tensile strength being at least 500 MPa.

Description

technical field [0001] The invention relates to the technical field of hot rolling, in particular to a method for controlling oxidation pit defects on the surface of a hot-rolled pickled plate. Background technique [0002] Hot-rolled pickled sheet is an intermediate product between cold-rolled and hot-rolled. It has a surface quality close to that of cold-rolled sheet while maintaining the mechanical properties of hot-rolled products. It has a wide range of applications. Hot-rolled pickled sheet has a good market prospect due to its high cost performance and economic benefits. [0003] The automotive structural steel used in the processing industry represented by the automotive industry is developing towards a trend of high strength and thin gauge. The demand for hot-rolled pickling plates with a thickness of ≤2mm and a tensile strength of ≥500MPa is increasing. This series of products has the characteristics of thin specifications and high strength. The surface of the pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/32B21B37/28
CPCB21B37/28B21B37/32
Inventor 郭子峰于洋冯军陈斌王林周娜王畅吴科敏李玉鹏李文远惠亚军吕宝锋王学强陈波宋春华
Owner SHOUGANG CORPORATION
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