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A kind of high-strength and high-toughness rebar and its preparation method

A high-strength, high-toughness, rebar technology, applied in the field of high-strength, high-toughness rebar and its preparation, can solve problems such as unsuitable rebar, impossibility, complex heat treatment process, etc., to achieve good plasticity, improved toughness, and strong impact toughness Effect

Active Publication Date: 2022-05-20
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned first method of improving the plasticity and toughness of materials has received extensive attention and research, but its manufacturing process requires a more complicated heat treatment process, which is not suitable for the field of rebar
The second method requires warm rolling in the ferrite non-recrystallized region to obtain a lamellar structure, which is almost impossible to achieve under the existing equipment conditions

Method used

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  • A kind of high-strength and high-toughness rebar and its preparation method
  • A kind of high-strength and high-toughness rebar and its preparation method
  • A kind of high-strength and high-toughness rebar and its preparation method

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preparation example Construction

[0058] The present invention also provides a preparation method of the high-strength and high-toughness rebar, the preparation method comprising:

[0059] Obtain the billet of the high-strength and high-toughness rebar (select 160*160mm billet in this embodiment);

[0060] The billet is subjected to pre-rolling heating, rough rolling, intermediate rolling, finishing rolling and post-rolling cooling to obtain high-strength and high-toughness rebar,

[0061] The heating temperature before rolling is 1100-1250°C. The billet heating temperature is properly adjusted according to the rebar composition. Generally speaking, the heating temperature should not be too low, if it is lower than 1100 ℃, it is not conducive to heating and uniform heating; the heating temperature should not be too high, otherwise the billet will show serious oxidation, and it is not conducive to energy saving.

[0062] Preferably, in the rough rolling, 4 to 6 passes are used for rolling, the rolling speed i...

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Abstract

The invention discloses a high-strength and high-toughness threaded steel. The chemical composition of the steel is: C: 0.03%-0.3%, Cr: 1.0%-10.0%, Mn: 0.01%-2.0%, Al: 0.01%~2.0%, Si: 0.01%~2.0%, P: 0.01%~0.2%, S≤0.03%, and Al+Si>1.5%, the rest is Fe and unavoidable impurities. The microstructure of the rebar has lamellar characteristics, and in terms of volume fraction, it contains 20-50% lamellar δ-ferrite, 15-30% bainite and 20-60% martensitic body. The invention also discloses a preparation method: heating the slab before rolling at 1100-1250°C, rough rolling, finishing rolling and cooling after rolling, the yield strength of the prepared steel is 569-752MPa, the tensile strength is 823-1015MPa, the impact toughness powerful.

Description

technical field [0001] The invention relates to the technical field of steel preparation, in particular to a high-strength and high-toughness threaded steel and a preparation method thereof. Background technique [0002] As the strength of steel materials is getting higher and higher, its plasticity and toughness are gradually decreasing. At present, there are mainly two methods to overcome this phenomenon. One is to introduce a metastable phase into the matrix, such as metastable austenite, and use the metastable phase to generate the TRIP / TWIP effect in the deformation process to delay necking and delay crack expansion; the other is to form a layered composite structure, using layered The high crack arrest ability of the structure can improve the toughness of the steel. The reason why the lamellar structure has a high crack arrest ability for cracks extending laterally is that the resistance of cracks passing through the longitudinally distributed tissue is very large. G...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/34C22C38/38C22C38/22C22C38/20C22C38/32C22C38/26C22C38/28C22C38/24C22C38/40C22C38/44C22C38/42C22C38/54C22C38/48C22C38/50C22C38/46C22C38/58C21D8/00
CPCC22C38/02C22C38/04C22C38/06C22C38/34C22C38/38C22C38/22C22C38/20C22C38/32C22C38/26C22C38/28C22C38/24C22C38/40C22C38/44C22C38/42C22C38/54C22C38/48C22C38/50C22C38/46C22C38/58C22C38/005C21D8/005C21D2211/005C21D2211/002C21D2211/008
Inventor 阳锋韩赟邱木生邹英刘华赛姜英花谢春乾潘丽梅白雪滕华湘陈斌曹杰章军朱国森
Owner SHOUGANG CORPORATION