700 MPa-grade hot-rolled container steel and low-cost production method thereof

A production process and container technology, applied in the direction of temperature control, etc., can solve the problems of high alloying cost, good corrosion resistance, good cold bending performance, etc., achieve the effect of low alloy content, excellent performance, and promote lightweight

Inactive Publication Date: 2019-06-14
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most steel mills are facing the following technical problems: 1. High strength, good corrosion resistance, good cold bending performance
2. The cost of alloying is relatively high, especially under the background of weak economic growth and high cost, both steel production enterprises and user enterprises feel the pressure

Method used

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  • 700 MPa-grade hot-rolled container steel and low-cost production method thereof
  • 700 MPa-grade hot-rolled container steel and low-cost production method thereof
  • 700 MPa-grade hot-rolled container steel and low-cost production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The present invention is described in detail by the following examples:

[0018] 1. Steelmaking

[0019] 1. Hot metal pretreatment process

[0020] S ≤ 0.006% into the furnace for pretreatment, remove the slag; use fine scrap steel.

[0021] 2. Converter process

[0022] The converter pulls carbon once and avoids spot blowing; high manganese, ferrosilicon, and ferromolybdenum are used for tapping; argon purges the ladle before tapping to control the tapping port and avoid scattered flow, and the Als of the ladle is controlled at 0.025-0.035%.

[0023] 3. Refining process

[0024] The LF refining process is adopted, and the gas content is strictly controlled. It is required to maintain a slight positive pressure in the LF treatment process, strictly control the increase of N in LF, and the amount of N increase is required to be ≤10ppm; LF uses active lime and fluorite to make reducing slag with good fluidity, strictly controls the intensity of argon blowing, and avoi...

Embodiment 2

[0033] In the same process as in Example 1, 5 groups of experimental parameters were done below.

[0034] Chemical composition table of example steel

[0035]

[0036] Rolling process of table 2 example steel

[0037] Example

Slab Thickness / mm

Heating temperature / ℃

Inlet and finish rolling temperature / ℃

Finishing temperature / ℃

Curling temperature / ℃

A1

230

1255

1100

865

565

A2

230

1248

1081

872

558

A3

230

1233

1095

870

580

A4

230

1252

1077

877

574

A5

230

1237

1067

866

575

[0038] The mechanical property of table 3 example steel:

[0039]

[0040] Corrosion performance of table 4 example steel

[0041] 72 hours relative corrosion test

[0042]

[0043] It can be seen from Table 1-Table 4 that the products of this process can meet the standard in terms of strength and cold bending performance, have sufficient margin and can meet t...

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PUM

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Abstract

The invention discloses 700 MPa-grade hot-rolled container steel and a low-cost production method thereof. The hot-rolled container steel has corrosion resistance, cold bending property, and of the container steel comprises the following alloy composition of, in percentage by mass, 0.05-0.09% of C, 1.20-1.50% of Mn, 0.35-0.50% of Si, 0.020-0.050% of Al, 0.20-0.40% of Cu, 0.50-0.70% of Cr, 0.070-0.100% of Ti, not greater than 0.015% of P, not greater than 0.005% of S, not greater than 0.0060% of N and not greater than 0.005% of O. According to the 700 MPa-grade hot-rolled container steel and the low-cost production method thereof, the hot-rolled container steel component design is low in alloy content, pure in molten steel, and capable of saving the cost on the basis of ensuring excellent performance; and the high compression ratio is achieved, and the structure and the performance of finished products are improved; and in terms of mechanical property, various indexes meet the requirements, and the surplus amount is relatively sufficient.

Description

technical field [0001] The invention belongs to the steelmaking process, and in particular relates to a 700MPa grade hot-rolled container steel and a low-cost production process thereof. Background technique [0002] Generally, goods sent from China to the United States use standard 20-foot or 40-foot sea containers, while the road and rail transportation systems in the inland areas of the United States are well developed. In order to save freight and improve transportation efficiency, the inland areas of the United States generally use larger containers 53-foot North American inland containers for transportation, so these standard 20-foot or 40-foot sea containers will be re-stacked at American ports and loaded into 53-foot North American inland containers for transportation. This method is time-consuming and laborious, and consumes serious social resources . Therefore, the domestic container industry puts forward the requirement of developing 53-foot special containers. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/20C22C38/28B21B37/74
Inventor 崔宏涛赵迪吴刚文小明徐勇苗隽韩宇周彦峰张彩臣张城铭刘志璞闵洪刚许学历陈英
Owner BENGANG STEEL PLATES
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