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345 MPa-grade low-cost high-toughness steel sheet and production method thereof

A production method and low-cost technology, applied in the field of metallurgy, can solve the problems of reduced toughness and deterioration of steel plate welding performance, and achieve the effects of good low-temperature impact toughness, reduced alloy cost and production cost, and refined grains

Inactive Publication Date: 2019-02-19
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, in order to obtain higher strength, in addition to higher carbon content, more alloying elements such as Mn need to be added to provide the internal strengthening framework of the steel, which will inevitably increase the carbon equivalent of the steel, and high strength and High toughness is a pair of contradictory factors. High strength will lead to a decrease in the toughness of the steel and a deterioration of the weldability of the steel plate.

Method used

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  • 345 MPa-grade low-cost high-toughness steel sheet and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The thickness specification of the 345MPa low-cost high-toughness steel plate in this embodiment is 20mm, and its chemical composition and mass percentage are: C: 0.13%, Si: 0.40%, Mn: 1.48%, P: 0.012%, S: 0.006% , Al: 0.035%, Nb: 0.030%, the balance is Fe and unavoidable impurities.

[0019] The production method of the 345MPa grade low-cost high-toughness steel plate of this embodiment includes steel billet heating, controlled rolling, post-rolling cooling, and steel plate straightening processes. The specific process steps are as follows:

[0020] (1) Billet heating process: the maximum billet heating temperature is 1260°C, the soaking temperature is 1240°C, the heating time is 11min / cm, of which the soaking time is 60min, and the billet thickness is 200mm;

[0021] (2) Controlled rolling process: a two-stage rolling process is adopted; the starting temperature of the first stage is 1080°C; the starting temperature of the second stage is 850°C, the final rolling temp...

Embodiment 2

[0026] The thickness specification of the 345MPa low-cost high-toughness steel plate in this embodiment is 30mm, and its chemical composition and mass percentage are: C: 0.14%, Si: 0.30%, Mn: 1.45%, P: 0.009%, S: 0.005% , Al: 0.020%, Nb: 0.033%, the balance is Fe and unavoidable impurities.

[0027] The production method of the 345MPa grade low-cost high-toughness steel plate of this embodiment includes steel billet heating, controlled rolling, post-rolling cooling, and steel plate straightening processes. The specific process steps are as follows:

[0028] (1) Billet heating process: the highest billet heating temperature is 1255°C, the soaking temperature is 1230°C, the heating time is 11min / cm, of which the soaking time is 65min, and the billet thickness is 200mm;

[0029] (2) Controlled rolling process: Two-stage rolling process is adopted; the starting temperature of the first stage is 1100°C; the starting temperature of the second stage is 860°C, the final rolling temper...

Embodiment 3

[0034] The thickness specification of the 345MPa low-cost high-toughness steel plate in this embodiment is 35mm, and its chemical composition and mass percentage are: C: 0.15%, Si: 0.20%, Mn: 1.50%, P: 0.008%, S: 0.003% , Al: 0.025%, Nb: 0.035%, the balance is Fe and unavoidable impurities.

[0035] The production method of the 345MPa grade low-cost high-toughness steel plate of this embodiment includes steel billet heating, controlled rolling, post-rolling cooling, and steel plate straightening processes. The specific process steps are as follows:

[0036] (1) Billet heating process: the highest billet heating temperature is 1250°C, the soaking temperature is 1230°C, the heating time is 12min / cm, of which the soaking time is 65min, and the billet thickness is 250mm;

[0037] (2) Controlled rolling process: a two-stage rolling process is adopted; the starting temperature of the first stage is 1130°C; the starting temperature of the second stage is 850°C, the final rolling temp...

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Abstract

The invention discloses a 345 MPa-grade low-cost high-toughness steel sheet and a production method thereof. The steel sheet is composed of the following chemical components of, in percentage by mass,0.13-0.16 % of C, 0.20-0.45% of Si, 1.45-1.55% of Mn, less than or equal to 0.012% of P, less than or equal to 0.008% of S, 0.020-0.045% of Al, 0.030-0.040% of Nb, and the balance Fe and inevitable impurities. The production method comprises the processes of steel billet heating, control rolling, cooling after rolling, and steel sheet straightening. According to the production method, the components are designed through optimizing the proportion of alloy elements in the steel sheet, the heating and the control rolling processes are enhanced, the rolling pass reduction is increased, the water-entry cooling is adopted after rolling, and grain structure is refined, so that the steel sheet which is well impacted at the low temperature of minus 52 DEG C is obtained, the safety requirements ofsevere cold regions and limiting condition equipment are met, the production cost is reduced, and the economic benefit is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 345MPa low-cost high-toughness steel plate and a production method thereof. Background technique [0002] At present, with the development of the national economy, higher and higher requirements are put forward for the use environment and safety of equipment. For steel, good low-temperature impact toughness can ensure that equipment can be used in severe cold regions and extreme conditions (such as accident conditions) ) will not be destroyed, thereby improving the security of the device. [0003] The 345 MP grade is the most commonly used strength grade for steel plates and is widely used because of its high strength and good toughness. Generally speaking, in order to obtain higher strength, in addition to higher carbon content, more alloying elements such as Mn need to be added to provide the internal strengthening framework of the steel, which will inevitably...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02
CPCC22C38/02C21D8/0205C21D8/0226C22C38/04C22C38/06C22C38/12
Inventor 邓建军李杰张海军林明新龙杰刘生张萌程含文谢东李肖
Owner WUYANG IRON & STEEL
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