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Low-cost high-strength and high-toughness bridge steel and preparation method thereof

A high-strength, high-toughness, low-cost technology, which is applied in the manufacture of steel box girders and long-span bridge steel structures, and in the field of metallurgy, can solve the problems of high production costs and achieve low production costs, simple production processes, and small additions.

Inactive Publication Date: 2019-12-31
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention patent with the publication number CN106811704A discloses a bridge steel with a yield strength of 500 MPa and a low yield ratio bridge steel and its manufacturing method, in which the C is 0.05% to 0.10%, and Cr, Ni, Cu, and Mo elements are added, and the production cost is relatively high

Method used

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  • Low-cost high-strength and high-toughness bridge steel and preparation method thereof
  • Low-cost high-strength and high-toughness bridge steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The chemical composition of high-strength and high-toughness bridge steel with a thickness of 60mm is as follows: C: 0.12%, Si: 0.25%, Mn: 1.55%, P: 0.010%, S: 0.002%, Al: 0.030%, Nb: 0.030%, V: 0.040%, Ti: 0.018%, the rest is Fe and unavoidable impurities. The preparation process is as follows: molten iron pretreatment → BOF steelmaking → LF refining → RH vacuum treatment → continuous casting → slow cooling → slab inspection, cleaning, judgment → heating → descaling → rolling → water cooling → flaw detection → spray printing logo → Cutting and sampling → storage.

[0028] The slab is slowly cooled to below 300°C, the thickness of the slab is 300mm, and the steel is tapped at 1170°C through a regenerative heating furnace.

[0029] The heating process adopts a three-stage heating process. The first stage: the temperature of the preheating stage is set at 800°C; Heating 2-2 section temperature is set at 1200°C; the third section: the temperature of the furnace gas in th...

Embodiment 2

[0032] The chemical composition of high-strength and high-toughness bridge steel with a thickness of 14mm is as follows: C: 0.10%, Si: 0.10%, Mn: 1.60%, P: 0.013%, S: 0.003%, Al: 0.045%, Nb: 0.010%, Ti: 0.025 %, the rest is Fe and unavoidable impurities. The preparation process is as follows: molten iron pretreatment → BOF steelmaking → LF refining → RH vacuum treatment → continuous casting → slow cooling → slab inspection, cleaning, judgment → heating → descaling → rolling → water cooling → flaw detection → spray printing logo → Cutting and sampling → storage.

[0033] The slab is slowly cooled to below 300°C, the thickness of the slab is 200mm, and the steel is tapped at 1150°C through a regenerative heating furnace.

[0034] The heating process adopts a three-stage heating process. The first stage: the temperature of the preheating stage is set at 700°C; The heating stage 2-2 temperature is set at 1230°C; the third stage: the temperature of the furnace gas in the soaking ...

Embodiment 3

[0037] The chemical composition of 40mm high-strength and high-toughness bridge steel steel is as follows: C: 0.13%, Si: 0.35%, Mn: 1.30%, P: 0.015%, S: 0.005%, Al: 0.015%, Nb: 0.035%, V: 0.015 %, Ti: 0.010%, the rest is Fe and unavoidable impurities. The preparation process is as follows: molten iron pretreatment → BOF steelmaking → LF refining → RH vacuum treatment → continuous casting → slow cooling → slab inspection, cleaning, judgment → heating → descaling → rolling → water cooling → flaw detection → spray printing logo → Cutting and sampling → storage.

[0038]The slab is slowly cooled to below 300°C, the thickness of the slab is 300mm, and the steel is tapped at 1180°C through a regenerative heating furnace.

[0039] The heating process adopts a three-stage heating process. The first stage: the temperature of the preheating stage is set at 850°C; Heating 2-2 section temperature is set at 1180°C; the third section: the temperature of the furnace gas in the soaking sect...

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Abstract

The invention provides low-cost high-strength and high-toughness bridge steel and a preparation method thereof, and is mainly used in the field of manufacturing bridge structural parts. The low-cost high-strength and high-toughness bridge steel comprises the following chemical components of, in percentage by weight, 0.10% - 0.13% of C, 0.10% - 0.30% of Si, 1.30% - 1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.015% - 0.0.045% of Al, less than or equal to 0.035% of Nb, less than or equal to 0.04% of V, 0.010% to 0.025% of Ti, and the balance Fe and inevitable impurities. The preparation method comprises the following production process flow of hot metal pretreatment -> BOF steelmaking -> LF refining -> RH vacuum treatment -> continuous casting -> slow cooling -> casting blank inspection, cleaning and judgment -> heating -> descaling -> rolling -> water cooling -> flaw detection -> spray marking -> cutting and sampling -> warehousing. The low-cost high-strength and high-toughness bridge steel and the preparation method thereof has low production cost, excellent low temperature impact toughness, excellent welding performance of steel plate, and can simplify the welding process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-cost, high-strength, high-toughness bridge steel and a preparation method thereof, which are mainly used in the field of manufacturing steel box girders and long-span bridge steel structures. Background technique [0002] With the development of large steel structure bridges towards fully welded structures and high parameters, the requirements for the safety and reliability of bridge structures are becoming more and more stringent. This not only puts forward higher requirements for designers, but also requires a higher level of steel plate quality, that is, not only has high strength to meet the requirements of lightweight structures, but also has high strength, excellent low temperature toughness and weldability, To meet the requirements of safety, reliability and longevity of steel structures. [0003] The invention patent with publication number CN1083303...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14B23P15/00C22C33/04
CPCB23P15/00C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 李灿明周兰聚韩启彪胡淑娥成小龙杨建勋刘熙章孔雅王兴王润港房振业
Owner SD STEEL RIZHAO CO LTD
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