Direct quenching type yield 800mpa grade structural steel plate and production method thereof

A technology of structural steel plate and production method, applied in the field of metallurgy, can solve problems such as unfavorable weldability, high alloy content, long process flow, etc., and achieve the effects of good weldability, comprehensive performance assurance, and production cost reduction

Active Publication Date: 2020-08-28
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, structural parts such as construction machinery and hydropower stations have higher and higher requirements on the strength of steel. The traditional high-strength steel plate is quenched and tempered high-strength steel, which adopts off-line process. This method has long process flow, high energy consumption and high alloy content. Poor, at present there are also direct quenching + tempering process, but the alloy content is high, the cost is high and it is not conducive to weldability

Method used

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  • Direct quenching type yield 800mpa grade structural steel plate and production method thereof
  • Direct quenching type yield 800mpa grade structural steel plate and production method thereof
  • Direct quenching type yield 800mpa grade structural steel plate and production method thereof

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Effect test

Embodiment 1

[0046] In this embodiment, the thickness of the directly quenched structural steel plate with a yield of 800 MPa is 45 mm, and its chemical composition and mass percentage are shown in Table 1.

[0047] The production method of direct quenching type yield 800MPa structural steel plate in this embodiment includes smelting, continuous casting, heating, rolling, online direct quenching, tempering and air cooling, and the specific process steps are as follows:

[0048] (1) Smelting process: see Table 1 for the chemical composition and mass percentage of molten steel produced during smelting;

[0049] (2) Continuous casting process: the thickness of continuous casting slab is 330mm;

[0050] (3) Heating process: the maximum heating temperature of the billet is 1240°C, the soaking temperature is 1220°C, the total heating time is 11min / cm, and the soaking section is in the furnace for 40min;

[0051] (4) Rolling process: Rolling is carried out using a two-stage controlled rolling pr...

Embodiment 2

[0056] In this embodiment, the thickness of the directly quenched structural steel plate with a yield of 800 MPa is 36 mm, and its chemical composition and mass percentage are shown in Table 1.

[0057] The production method of direct quenching type yield 800MPa structural steel plate in this embodiment includes smelting, continuous casting, heating, rolling, online direct quenching, tempering and air cooling, and the specific process steps are as follows:

[0058] (1) Smelting process: see Table 1 for the chemical composition and mass percentage of molten steel produced during smelting;

[0059] (2) Continuous casting process: the thickness of continuous casting slab is 300mm;

[0060] (3) Heating process: the maximum heating temperature of the billet is 1240°C, the soaking temperature is 1210°C, the total heating time is 10min / cm, and the soaking section is in the furnace for 40min;

[0061] (4) Rolling process: Rolling is carried out using a two-stage controlled rolling pr...

Embodiment 3

[0066] In this embodiment, the thickness of the directly quenched structural steel plate with a yield of 800 MPa is 30 mm, and its chemical composition and mass percentage are shown in Table 1.

[0067] The production method of direct quenching type yield 800MPa structural steel plate in this embodiment includes smelting, continuous casting, heating, rolling, online direct quenching, tempering and air cooling, and the specific process steps are as follows:

[0068] (1) Smelting process: see Table 1 for the chemical composition and mass percentage of molten steel produced during smelting;

[0069] (2) Continuous casting process: continuous casting slab thickness 200mm;

[0070] (3) Heating process: the maximum heating temperature of the billet is 1230°C, the soaking temperature is 1200°C, the total heating time is 9min / cm, and the soaking section is in the furnace for 40min;

[0071] (4) Rolling process: Rolling is carried out using a two-stage controlled rolling process in th...

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Abstract

The invention discloses a direct quenching type yield 800 MPa level structure steel plate and a production method thereof. The steel plate comprises chemical components including, by mass percent, 0.05%-0.09% of C, 0.16%-0.20% of Si, 1.05%-1.15% of Mn, smaller than or equal to 0.01% of P, smaller than or equal to 0.003% of S, 0.015%-0.025% of Nb, 0.45%-0.55% of Cr, 0.3%-0.4% of Ni, 0.001%-0.0015%of B, 0.01%-0.02% of Ti, 0.02%-0.05% of Alt and the balance Fe and inevitable impurities. The production method comprises the procedures of smelting, continuous casting, heating, rolling, online direct quenching and tempering air cooling. The steel plate has the low carbon equivalent and welding crack sensitivity index and excellent low-temperature impact toughness and welding performance and canbe used in the fields such as hydropower stations, ships, ocean platforms and engineering machines.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a direct quenching type structural steel plate with a yield of 800MPa and a production method thereof. Background technique [0002] At present, structural parts such as construction machinery and hydropower stations have higher and higher requirements on the strength of steel. The traditional high-strength steel plate is quenched and tempered high-strength steel, which adopts off-line process. This method has long process flow, high energy consumption and high alloy content. Poor, at present there are also direct quenching + tempering process, but the alloy content is high, the cost is high and it is not conducive to weldability. [0003] The Chinese invention patent application with the publication number CN 108359879 A discloses a DQ-T method for a 1000MPa-grade steel plate for hydropower with a thickness of no more than 60mm. The DQ+T production process is adop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/48C22C38/54C22C38/50C22C38/06C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C21D2211/00C21D2211/002C22C38/02C22C38/04C22C38/06C22C38/48C22C38/50C22C38/54
Inventor 田志强孙力齐建军刘建磊赵燕青张晨光王少义陈振业杨浩
Owner HEBEI IRON AND STEEL
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