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High-strength weather-resistant hot rolled steel strip and manufacturing method thereof

A technology that is resistant to atmospheric corrosion and manufacturing methods, applied in the direction of metal rolling, etc., can solve problems such as increasing steel costs, affecting the stable production and safe operation of railway vehicles, and the mechanical properties of finished products and abnormal fluctuations in forming, so as to achieve good forming performance and harmless Effect of low elemental content and zonation level

Inactive Publication Date: 2010-07-07
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Atmospheric corrosion-resistant steel for existing railway vehicles has increased strength, but there are stamping or bending cracks, which seriously affects the stable production and safe operation of railway vehicles
[0003] Prior to the present invention, the invention patent of "a high-strength easy-to-form atmospheric corrosion-resistant steel" published on August 6, 2008 with the publication number CN101235469A provided a high-strength atmospheric corrosion-resistant steel, but the steel contained 0.08 -0.20% precious alloying element Mo increases the cost of steel. In addition, it is necessary to add expensive rare earth elements to the steel. In actual production, quality problems such as rare earth inclusions, surface cracks, and nozzle nodules are prone to occur, resulting in abnormal fluctuations in the mechanical properties and molding of the finished product, and increasing the difficulty of production
[0004] The invention patent of "a high-strength low-alloy atmospheric corrosion-resistant steel and its production method" published on October 1, 2008 with the publication number CN100422373C provides a high-strength atmospheric corrosion-resistant steel and its production method, but the steel It also contains 0.14-0.35% of the precious alloying element Mo, and the cost of steel is higher

Method used

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  • High-strength weather-resistant hot rolled steel strip and manufacturing method thereof
  • High-strength weather-resistant hot rolled steel strip and manufacturing method thereof
  • High-strength weather-resistant hot rolled steel strip and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In this embodiment, the thickness of the 550MPa-grade high-strength, good-formability, atmospheric-corrosion-resistant hot-rolled steel strip is 3.0 mm, and the mass percentage ratio of the chemical components is:

[0044] C: 0.063 Si: 0.18 Mn: 1.22 P: 0.010 S: 0.003

[0045] Cr: 0.68 Ni: 0.22 Cu: 0.41 Nb+V+Ti: 0.08, the rest is Fe and unavoidable impurities.

[0046] Table 2 shows the test results of the mechanical properties, formability and band structure of the hot-rolled steel strip in this example, and see Table 3 for the test results of the atmospheric corrosion resistance.

[0047] Table 2

[0048]

[0049] table 3

[0050]

Embodiment 2

[0052] In this embodiment, the thickness of the 550MPa-grade high-strength, good-formability, atmospheric-corrosion-resistant hot-rolled steel strip is 10.0 mm, and the mass percentage ratio of the chemical components is:

[0053] C: 0.083 Si: 0.32 Mn: 1.50 P: 0.011 S: 0.003

[0054] Cr: 0.72 Ni: 0.22 Cu: 0.42 Nb+V+Ti: 0.11, the rest is Fe and unavoidable impurities.

[0055] Table 2 shows the test results of the mechanical properties, formability and band structure of the hot-rolled steel strip in this example, and see Table 3 for the test results of the atmospheric corrosion resistance.

Embodiment 3

[0057] The thickness of the 550MPa-grade high-strength, good-formability, atmospheric-corrosion-resistant hot-rolled steel strip in this embodiment is 18.0 mm, and the mass percentage ratio of the chemical components is:

[0058] C: 0.096 Si: 0.42 Mn: 1.80 P: 0.010 S: 0.003

[0059] Cr: 0.70 Ni: 0.23 Cu: 0.43 Nb+V+Ti: 0.15, the rest is Fe and unavoidable impurities.

[0060] Table 2 shows the test results of the mechanical properties, formability and band structure of the hot-rolled steel strip in this example, and see Table 3 for the test results of the atmospheric corrosion resistance.

[0061] Manufacturing method embodiment one

[0062] What the present embodiment made was the steel strip embodiment one, and the manufacturing method of the present embodiment comprises the following steps in sequence:

[0063] A preparation of continuous casting slab

[0064] Through hot metal pretreatment desulfurization, 180-ton top-bottom compound blowing converter smelting, LF refini...

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Abstract

The invention relates to a high-strength weather-resistant hot rolled steel strip and a manufacturing method thereof, and the hot rolled steel strip comprises the following components by mass percent: 0<C<=0.10, 0.15<=Si<=0.45, 1.20<=Mn<=1.85, 0<P<=0.020, 0<S<=0.008, 0.35<=Cr<=1.00, 0.15<=Ni<=0.55, 0.25<=Cu<=0.50, and 0<Nb+V+Ti<=0.22. The manufacturing method of the steel strip has the following steps: A, manufacturing continuously cast bloom by molten iron pretreatment desulfurization, smelting by a top and bottom blowing converter, LF refining and continuous casting of thick slabs; and B, processing the continuously cast bloom into the hot rolled steel strip by using controlled rolling and controlled cooling technologies with the finishing rolling temperature of 790-890 DEG C, rapidly cooling the temperature to 450-650 DEG C by water, reeling and cooling to room temperature. Steel strips which are processed by the manufacturing method of 550MPa high-strength good mouldability weather-resistant hot rolled steel steeps have less harmful element content and lower banded structure level, higher comprehensive mechanical property, weather resistance and good mouldability.

Description

technical field [0001] The invention relates to a high-strength atmospheric corrosion-resistant hot-rolled steel strip and a manufacturing method thereof, specifically a 550MPa high-strength atmospheric-corrosion-resistant hot-rolled steel strip and a manufacturing method thereof. Background technique [0002] Atmospheric corrosion-resistant steel is mainly used to manufacture structural parts that require atmospheric corrosion resistance, such as containers, railway vehicles, corrosion-resistant parts of power plant boilers, oil derricks, and construction machinery. Among them, the railway industry is one of the most important application fields of atmospheric corrosion-resistant steel. The development trend of railway vehicles is high speed and heavy load. Improving the strength of steel to reduce the weight of vehicles is an important means to achieve this goal. Stamping and bending are the most important forming methods of atmospheric corrosion-resistant steel for railway...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50B21B1/46
Inventor 辛建卿焦向斌
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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