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Rolling process capable of improving uniformity of microstructure and properties of low-carbon manganese steel

A technology of low-carbon manganese steel and uniformity, which is applied in the field of rolling technology, can solve problems such as unsatisfactory requirements, and achieve the effects of accelerating cooling speed, sufficient and uniform diffusion, and inhibiting long-distance diffusion

Inactive Publication Date: 2013-01-16
ZENITH STEEL GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the control of the banded structure level of the material is very important, and the banded structure of the bar is required to be controlled below level 2.0. Therefore, the ordinary rolling process can no longer meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A rolling process that can improve the uniformity of the structure and properties of low-carbon manganese steel, the specific requirements of the rolling process are as follows:

[0019] 1) During the heating process, the effective size of the heating furnace is 34.4×10.9 meters; the fuel is blast furnace gas; the heating capacity is 180t / h; the section of the billet is 220×260mm2; Control the steel loading and tapping rhythm, and load and tap steel according to the rhythm of 130 seconds / piece. The total heating time of the billet is 220 minutes, and the billet is soaked for 100 minutes at a temperature of 1240°C to ensure sufficient and uniform diffusion of carbon and manganese elements, and to make the austenite grain size exceed the original strip width.

[0020] 13 continuous rolling mills: 800×3, 700×2, 610×4, 430×4 two-high short stress line rolling mills to roll billets into round bars. 4 hot saws: 1 fixed saw, 3 mobile saws, cut to length according to user requ...

Embodiment 2

[0024] SA-210C low carbon manganese steel bar for high pressure boiler tube is ∮90mm, the highest band structure of steel is 2.0, the lowest is 0.5, and the average is 1.0

[0025] The rest are implemented as in Example 1.

Embodiment 3

[0027] The SA-210C low carbon manganese steel bar for high pressure boiler tube is ∮110mm, the highest band structure of the steel is 2.0, the lowest is 0.5, and the average is 1.5

[0028] The rest are implemented as in Example 1.

[0029] The low-carbon manganese steel produced by the present invention, such as SA-210C, 20MnG and other steel grades, has been inspected and used by high-pressure boiler tube manufacturers, and the horizontal and vertical plasticity and toughness of the high-pressure boiler tubes produced by the method are basically the same, and meet the requirements for use. .

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Abstract

The invention discloses a rolling process capable of improving the uniformity of a microstructure and properties of low-carbon manganese steel. The concrete requirements are that: the rhythm of steel loading and unloading is controlled, the total heating time of a steel billet is 210 to 240 minutes, and the steel billet is uniformly heated for 90 to 110 minutes at the furnace gas temperature of 1,220 to 1,250 DEG C so as to ensure that carbon and manganese elements are diffused fully and uniformly and the sizes of austenite crystal grains exceed the width of the original banded stripe; and a rolled product is air-cooled to ensure that the cooling rate of the rolled product is increased in a two-phase region, the long-distance diffusion of carbon on the original banded foundation is inhibited and a ferrite-pearlite banded structure is controlled. A fan can be arranged at an inlet of a cooling bed to air-cool the rolled product. By the rolling process, banded structures of low-carbon manganese steel bars can be stably controlled to be below level 2.0, transverse and longitudinal properties of steel are consistent, and the operating requirements are met.

Description

technical field [0001] The invention relates to low-carbon manganese steel in the iron and steel industry, in particular to a rolling process capable of improving the microstructure and performance uniformity of the low-carbon manganese steel. Background technique [0002] The banded structure is an important reason that affects the uniformity of the structure and properties of the steel. The existence of banded structure will make the mechanical properties of steel anisotropic and affect the transverse plasticity of steel, thus reducing the impact toughness and reduction of area of ​​steel. Low-carbon manganese steels such as SA-210C, 20MnG, and 25MnG are blanks for the production of seamless steel pipes for high-pressure boilers. They are mainly used in the manufacture of industrial steam boilers. The particularity and high safety requirements of the steel have higher requirements for the transverse and longitudinal properties of the steel. Therefore, the control of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00
Inventor 许加陆周浩赵新春
Owner ZENITH STEEL GROUP CORP
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