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

thick steel plate

A thick steel plate, high-quality technology, applied in the field of thick steel plate, can solve the problems of HAZ toughness deterioration and achieve the effect of excellent HAZ toughness

Active Publication Date: 2021-02-09
NIPPON STEEL CORP
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the structure of the HAZ after cooling becomes coarse, and the toughness of the HAZ deteriorates.

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
  • thick steel plate
  • thick steel plate
  • thick steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] The present invention will be described more specifically by way of examples.

[0124]

[0125] Steels having the chemical compositions of test numbers Examples 1 to 28 and Comparative Examples 1 to 18 shown in Table 1 were melted through the actual manufacturing process. In this manufacturing process, the total amount of Fe in the slag is adjusted by blowing Ar gas from the top into the molten steel before the RH vacuum degassing treatment to cause the slag on the surface of the molten steel to react with the molten steel.

[0126] The flow rate of Ar gas was adjusted within the range of 100 to 200 L / min, and the blowing time was adjusted within the range of 5 to 15 minutes.

[0127] Afterwards, each element was added by the RH vacuum degasser to adjust the composition, and a 300mm slab was cast by continuous casting. The cast slab is heated in a heating furnace in the range of 1000-1100°C. After heating, it is hot-rolled at a temperature of 760°C or higher until i...

Embodiment 9

[0147] In Example 9, although the CTOD test result was acceptable, the YP and TS were low because the C content was close to the lower limit of the range of the present invention.

Embodiment 10

[0148] In Example 10, although the result of the CTOD test was acceptable, the YP and TS were low because the Si content was close to the lower limit of the range of the present invention.

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
diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
yield stressaaaaaaaaaa
Login to View More

Abstract

A thick steel plate whose chemical composition in mass % is C: 0.01-0.20%, Si: 0.10-0.25%, Mn: 1.30-2.50%, P: less than 0.01%, S: 0.0010-0.0100%, Ti: 0.005 ~0.030%, Al: 0.003% or less, O: 0.0010~0.0050%, N: 0.0100% or less, Cu: 0~0.50%, Ni: 0~1.50%, Cr: 0~0.50%, Mo: 0~0.50% , V: 0 to 0.10%, Nb: 0 to 0.05%, and the balance: Fe and impurities, and the steel contains composite inclusions in which MnS exists around Ti oxides. The area ratio of MnS in the cross section of the composite inclusion is 10% or more and less than 90%, the ratio of MnS to the perimeter of the composite inclusion is 10% or more, and the number density of composite inclusions with a particle size of 0.5 to 5.0 μm 10~100 pieces / mm 2 . This thick steel plate is excellent in the low-temperature characteristics of the HAZ during high heat input welding.

Description

technical field [0001] The present invention relates to thick steel plates. In particular, the present invention relates to a thick steel plate having excellent toughness in a welded heat-affected zone (Heat Affected Zone: hereinafter referred to as "HAZ") used for marine structures such as offshore oil and gas extraction equipment. Background technique [0002] In order to improve the safety and reliability of the fracture of the welded part, the toughness of thick steel plates used in various welded steel structures such as buildings, bridges, shipbuilding, pipelines, construction machinery, marine structures, storage tanks, etc., It gets stricter every year. In particular, in addition to the toughness of the base steel sheet, there is a similar demand for ensuring excellent HAZ toughness. [0003] In the HAZ, the closer to the fusion line, the higher the heating temperature at the time of welding. In particular, austenite grains are remarkably coarsened when heated to ...

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 Patents(China)
IPC IPC(8): C22C38/00C22C38/58
CPCC21D8/0226C21D8/0263C22C38/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/14C22C38/16C22C38/18
Inventor 笠野和辉小栗正裕加茂孝浩
Owner NIPPON STEEL CORP
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