Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Acid-pickling-free hot rolled strip steel with high surface quality and manufacturing method thereof

A technology for hot-rolled strip steel and a manufacturing method, which is applied to the field of pickling-free hot-rolled strip steel and its manufacturing, can solve the problems that stamping and falling off cannot be completely avoided, the surface quality of pickling sheets and cold-rolled sheets cannot be achieved, and the like. The effect of peeling off the oxide layer, improving adhesion and formability, and excellent formability

Active Publication Date: 2016-11-16
BAOSHAN IRON & STEEL CO LTD
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Fe in the iron oxide scale in black steel 3 o 4 After the content is increased, its adhesion is improved, which can reduce the stamping shedding, but it cannot completely avoid the stamping shedding, and the hot-rolled sheet with iron oxide can not always reach the surface quality of the pickled sheet and cold-rolled sheet

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Acid-pickling-free hot rolled strip steel with high surface quality and manufacturing method thereof
  • Acid-pickling-free hot rolled strip steel with high surface quality and manufacturing method thereof
  • Acid-pickling-free hot rolled strip steel with high surface quality and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1-A12、 comparative example B1-B5

[0064] Table 1 lists the structural data of the high surface quality pickling-free hot-rolled steel strips of Examples A1-A12 and the steel strips of Comparative Examples B1-B5.

[0065] Table 1.

[0066]

[0067] As can be seen from Table 1, the thickness of its pure iron layer of the high surface quality non-pickling hot-rolled steel strip of embodiment A1-A12 is 0.5-5 μ m, and the thickness of pure iron layer is less than 1 / 2nd of surface oxide layer thickness , the coverage of the pure iron layer on the iron oxide layer is greater than 70%, the thickness of the surface oxide layer is less than 20 μm, and the thickness of the inner oxide layer is less than 30 μm.

[0068] figure 2 The surface morphology of Example A1 is shown. image 3 The surface morphology of Comparative Example B1 is shown. Figure 4 The cross-sectional metallographic structure of Example A1 is shown. Figure 5 The cross-sectional metallographic structure of Comparative Example B1 is shown. Fig...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses acid-pickling-free hot rolled strip steel with the high surface quality. Oxide layers are arranged on the surface of the acid-pickling-free hot rolled strip steel and comprise the surface oxide layer and the inner oxide layer, wherein the inner oxide layer closely adjoins the surface oxide layer and is located on the inner side of the surface oxide layer. The surface oxide layer comprises a pure iron layer relatively located on the outer layer and a ferric oxide layer relatively located on the inner layer. The appearance and surface quality of the acid-pickling-free hot rolled strip steel approximate to those of a cold-rolled plate, the acid-pickling-free hot rolled strip steel is excellent in formability, and the oxide layers cannot fall in the stamping process. In addition, the invention discloses a manufacturing method of the acid-pickling-free hot rolled strip steel. The method includes the steps of (1) smelting and casting, (2) hot rolling and (3) finishing. According to the step of hot rolling, the heating temperature is 1100-1300 DEG C, heat preservation is conducted for 1-5 h, the final rolling temperature is not smaller than 850 DEG C, the strip steel is cooled at the speed of 1-10 DEG C / s after finish rolling, and a hot-rolled plate is reeled at the temperature of 600-750 DEG C. The acid-pickling-free hot rolled strip steel can be obtained through an existing hot rolling production line, acid pickling is not needed, the cost is low, and the quality is high; and the acid-pickling-free hot rolled strip steel has the application prospects of replacing acid-pickled plates and part of cold-rolled plates.

Description

technical field [0001] The invention relates to a hot-rolled steel strip and a manufacturing method thereof, in particular to an pickling-free hot-rolled steel strip and a manufacturing method thereof. Background technique [0002] Hot-rolled steel strip is formed by rolling the heated slab at high temperature and then coiling. After hot rolling, the surface will be formed by Fe 2 o 3 , Fe 3 o 4 , FeO oxide scale, the appearance is red or black, and the surface appearance quality is poor, so it generally needs to be removed by pickling. [0003] Although the currently widely used pickling method can remove scale, the waste acid and other pollution produced is serious and the manufacturing cost is relatively high. Therefore, some users hope to directly use the hot-rolled strip with scale for stamping parts, but due to the poor formability of iron oxide, the stamping process will cause the scale on the surface of the hot-rolled strip to fall off and become powder, which no...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04B21C37/02C21D8/02
CPCB21C37/02C21D8/0226C22C38/02C22C38/04
Inventor 金鑫焱周澍
Owner BAOSHAN IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products