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DQ-T method for 1000 MPa stage water and electricity steel plate with thickness not larger than 60 mm

A steel plate and steel plate technology for hydropower, which is applied in the field of metallurgy, can solve the problems that the strength and low-temperature impact toughness cannot meet the mechanical performance requirements of 1000MPa steel for hydropower, reduce the carbon equivalent and welding cold crack sensitivity index, and reduce production costs , The effect of shortening the process flow

Active Publication Date: 2018-08-03
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the strength and low-temperature impact toughness of steel plates no larger than 60 mm thick produced by the above-mentioned patented method cannot meet the mechanical property requirements of 1000 MPa grade hydropower steel

Method used

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  • DQ-T method for 1000 MPa stage water and electricity steel plate with thickness not larger than 60 mm
  • DQ-T method for 1000 MPa stage water and electricity steel plate with thickness not larger than 60 mm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Smelt molten steel according to the set composition and continuously cast it into a slab with a thickness of 320mm. The composition by weight percentage is C0.1031%, Mn 1.1501%, P 0.0075%, S 0.001%, Si 0.2487%, Ni 1.2502%, Cr 0.375% , Cu 0.0124%, Alt 0.0301%, Nb 0.0241%, Mo 0.3693%, V 0.04%, Ti 0.0136%, B0.0015%, the balance is Fe;

[0041] Heat the slab to 1200°C for 360 minutes, then use high-pressure water to remove phosphorus, and then conduct 8 passes of rough rolling, the starting temperature is 1165°C, the final rolling temperature is 1025°C, and the total reduction rate is 79.69%; The rolling start temperature is 890°C, the final rolling temperature is 839°C, the rolling pass is 4, the total reduction rate is 63.08%, the thickness of the steel plate after finishing rolling is 24mm, and then pass pass leveling, water cooling after hot rolling Cool to room temperature at a rate of 35°C / s. The microstructure of the steel plate after controlled rolling and controll...

Embodiment 2

[0044] Smelt molten steel according to the set composition and continuously cast it into a slab with a thickness of 320mm. The composition is C0.114%, Mn 0.9418%, P 0.0077%, S 0.0014%, Si 0.2487%, Ni 1.4338%, Cr0.4825 %, Cu 0.0136%, Alt 0.0301%, Nb 0.0251%, Mo 0.4739%, V 0.0428%, Ti0.0152%, B 0.0016%, and the balance is Fe;

[0045] Heat the slab to 1220°C for 350 minutes, then use high-pressure water to remove phosphorus, and then conduct 8 passes of rough rolling. The starting temperature is 1158°C, the final rolling temperature is 1036°C, and the total reduction rate is 79.69%. The rolling start temperature is 905°C, the final rolling temperature is 846°C, the rolling pass is 4, the total reduction rate is 63.08%, the thickness of the steel plate after finishing rolling is 24mm, and then one pass of leveling is carried out. After hot rolling, water cooling is used to cool the room temperature at a rate of 40°C / s;

[0046] Temper the steel plate at a high temperature of 630...

Embodiment 3

[0048] Smelt molten steel according to the set composition and continuously cast it into a slab with a thickness of 320mm. The composition is C0.114%, Mn 0.9418%, P 0.0077%, S 0.0014%, Si 0.2487%, Ni 1.4338%, Cr0.4825 %, Cu 0.0136%, Alt 0.0301%, Nb 0.0251%, Mo 0.4739%, V 0.0428%, Ti0.0152%, B 0.0016%, and the balance is Fe;

[0049] Heat the slab to 1200°C for 360 minutes, then use high-pressure water to remove phosphorus, and then carry out 6 passes of rough rolling, the starting temperature is 1165°C, the final rolling temperature is 1038°C, and the total reduction rate is 63.33%; The rolling start temperature is 887°C, the final rolling temperature is 831°C, the rolling pass is 4, the total reduction rate is 56.36%, the thickness of the steel plate after finishing rolling is 48mm, and then pass leveling. After hot rolling, water cooling to room temperature at a rate of 30°C / s;

[0050] Temper the steel plate at a high temperature of 630°C for 150 minutes to obtain a 48mm t...

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Abstract

The invention discloses a DQ-T method for a 1000 MPa stage water and electricity steel plate with the thickness not larger than 60 mm. The steel plate comprises chemical components including 0.09%-0.18% of C, 0.80%-1.60% of Mn, not larger than 0.01% of P, not larger than 0.002% of S, not larger than 0.40% of Si, 0.9%-2.6% of Ni, not larger than 0.75% of Cr, not larger than 0.20% of Cu, not largerthan 0.10% of Alt, not larger than 0.06% of Nb, 0.3%-0.65% of Mo, not larger than 0.12% of V, not larger than 0.06% of Ti, not larger than 0.003% of B and the balance Fe. Smelting is carried out according to set components, two-stage rolling is carried out, direct quenching is carried out after rolling, off-line tempering is finally carried out to obtain a microscopic structure with tempered sorbite and a small quantity of tempered martensite, the strength, plasticity and low temperature impact toughness are excellent and matched, the good welding performance is achieved, and the welding coldcrack sensitive index Pcm is smaller than or equal to 0.29%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a DQ-T production method of a 1000MPa steel plate for hydroelectricity with a thickness not greater than 60mm. Background technique [0002] At present, the tensile strength of steel plates for hydropower is developing towards the direction of 1000MPa. Usually, the thickness specification of the steel plate for hydropower is 10-100mm. With the increase of thickness specifications, the microstructure and mechanical properties of the steel plate are difficult to control and guarantee. Therefore, it is necessary to ensure mechanical performance indicators such as strength and impact energy from the aspects of composition design and process path control for different thickness specifications. [0003] The patent with application number 201310269680.2 proposes a high-strength steel plate for pressure pipes of 800MPa hydropower stations and its production method, which...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/42C22C38/48C22C38/44C22C38/46C22C38/50C22C38/54C22C38/06C22C38/04C22C38/02C21D8/02
CPCC21D8/0205C21D8/0221C21D8/0247C21D2211/00C21D2211/008C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 李长生陈洁涂兴洋金鑫陈礼清
Owner NORTHEASTERN UNIV
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