Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Large-thickness high-toughness S500QL1 steel plate and production method thereof

A production method and high toughness technology, applied in the field of metallurgy, can solve the problems that restrict the manufacture of heavy machinery and the construction and development of hydropower stations, the poor stability of the negative temperature impact performance of steel plates, and the poor uniformity of bainite grain size, etc. The effect of improving negative temperature impact toughness and convenient rolling

Inactive Publication Date: 2020-10-27
WUYANG IRON & STEEL
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to guarantee excellent negative temperature impact toughness for S500QL1 steel plates with a thickness of more than 200 mm produced by conventional high temperature quenching + tempering
[0004] For a long time, due to the lack of necessary production equipment and technical support, large-thickness, high-strength, and high-toughness steel plates over 200 mm are limited by the quenching capacity of the factory, and the 1 / 4 position of the steel plate thickness and the cooling rate of the core are ≤ 1 ℃ / s. The fine and single bainite structure is obtained, and the obtained structure is bainite + a small amount of ferrite structure, in which the content of ferrite is small, which has no significant effect on the mechanical properties of the steel plate, but the grain size of the bainite is uniform Poor resistance, resulting in poor stability of the negative temperature impact performance of the steel plate, unable to meet the user's requirements, and the production cost is high, which seriously restricts the development of my country's heavy machinery manufacturing and hydropower station construction

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Large-thickness high-toughness S500QL1 steel plate and production method thereof
  • Large-thickness high-toughness S500QL1 steel plate and production method thereof
  • Large-thickness high-toughness S500QL1 steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, the chemical composition and mass percentage of the large-thickness and high-toughness S500QL1 steel plate are shown in Table 1, and the properties are shown in Table 2. The thickness of the steel plate is 300 mm. The specific control parameters of each production process are as follows:

[0038] (1) Smelting process: The molten steel is first smelted in the primary smelting furnace and then sent to the LF refining furnace for refining. The temperature of the molten steel reaches 1560°C and then it is transferred to the VD furnace for vacuum degassing treatment. The vacuum degree is 65.0Pa and the vacuum holding time is 25min.

[0039] (2) Casting process: the molten steel after smelting is continuously cast, the superheat is 23°C, and the continuous casting slab is obtained by continuous casting;

[0040] (3) Electroslag remelting process: The average dissolution rate of electroslag remelting is 23kg / min, adding aluminum particles at 25g / t / min, electro...

Embodiment 2

[0046] In this embodiment, the chemical composition and mass percentage of the large-thickness and high-toughness S500QL1 steel plate are shown in Table 1, and the properties are shown in Table 2. The thickness of the steel plate is 280 mm. The specific control parameters of each production process are as follows:

[0047] Production process: (1) Smelting process: The molten steel is first smelted in the primary smelting furnace and then sent to the LF refining furnace for refining. The temperature of the molten steel reaches 1560°C and then transferred to the VD furnace for vacuum degassing treatment. The vacuum degree is 65.0Pa and the vacuum holding time is 26 minutes.

[0048] (2) Casting process: continuous casting of molten steel after smelting, superheated at 23°C, and continuous casting to obtain continuous casting slabs;

[0049] (3) Electroslag remelting process: The average dissolution rate of electroslag remelting is 23kg / min, adding aluminum particles at 25g / t / min...

Embodiment 3

[0055] In this embodiment, the chemical composition and mass percentage of the large-thickness and high-toughness S500QL1 steel plate are shown in Table 1, and the properties are shown in Table 2. The thickness of the steel plate is 200 mm.

[0056] The specific control parameters of each production process are as follows:

[0057] Production process: (1) Smelting process: The molten steel is first smelted in the primary smelting furnace and then sent to the LF refining furnace for refining. The temperature of the molten steel reaches 1560°C and then transferred to the VD furnace for vacuum degassing treatment. The vacuum degree is 65.0Pa and the vacuum holding time is 26 minutes.

[0058] (2) Casting process: Die-cast the molten steel after smelting, with a superheat of 24°C, and mold-cast the molten steel into steel ingots.

[0059] (4) Heating process: the heating rate of steel ingot below 1000℃ is 115℃ / h, the maximum heating temperature is 1240℃, the soaking temperature is...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
yield strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a large-thickness high-toughness S500QL1 steel plate and a production method thereof. The steel plate comprises chemical components: by mass, 0.12-0.14% of C, 0.20-0.40% of Si,1.00-1.25% of Mn, 0.80-1.10% of Ni, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.020-0.040% of Nb, 0.30-0.50% of Cr, 0.40-0.50% of Mo, 0.020-0.045% of Al during preparationof steel ingots, 0.060-0.090% of Al during preparation of electroslag ingots, and the balance Fe and inevitable impurities. The preparation method comprises the steps of heating, rolling and heat treatment. By adjusting the design of the chemical components of the steel plate and through cooperation of high-temperature large-reduction rolling and the reasonable heat treatment regime, it is guaranteed that the steel plate has the good structural and comprehensive properties and welding performance, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a large-thickness and high-toughness S500QL1 steel plate and a production method thereof. Background technique [0002] In recent years, with the rapid development of my country's heavy machinery and hydropower construction, the demand for large-thickness steel plates has become increasingly prominent, and the market's demand for large-thickness, low-alloy, high-strength steel is increasing. S500QL1 steel plate is mainly used in hydropower stations, construction machinery, mining machinery, coal mining machinery, hydropower seat ring plate, hydraulic support, crane extension arm, crane extension arm, excavator support arm, etc. [0003] At present, the maximum supply thickness of domestic S500QL1 steel plate is only 150mm, and the heat treatment is produced by high temperature (complete) quenching + tempering, and the structure of the steel plate is fine bainite. The critical co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/48C22C38/44C22C38/06C21D8/02C21D1/18C21D1/26
CPCC22C38/02C22C38/04C22C38/48C22C38/44C22C38/06C21D8/0226C21D1/18C21D8/0257C21D1/26C21D2211/002C21D2211/005
Inventor 郭恒斌李建朝李杰吕建会龙杰庞辉勇张亚丽任鑫磊贺霄蒙耀华陈起张西忠
Owner WUYANG IRON & STEEL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com