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

X70 steel plate for low-cost pipe fittings and production method thereof

A production method and low-cost technology, applied in the field of steel, can solve the problems of high cost, high production difficulty, and large amount of alloy added.

Inactive Publication Date: 2011-05-04
NANYANG HANYE SPECIAL STEEL CO LTD
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production of the known X70 steel plate is difficult, the production cycle is long, and it is difficult for enterprises with poor equipment level to produce low-cost and high-quality pipeline steel
As X70 steel for pipe fittings, the production is slightly lower because the requirements of the technical agreement are slightly lower than those of pipeline steel, but the domestic steel production of this type of steel plate requires a large amount of alloy addition and high cost

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
  • X70 steel plate for low-cost pipe fittings and production method thereof
  • X70 steel plate for low-cost pipe fittings and production method thereof
  • X70 steel plate for low-cost pipe fittings and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Through molten iron pretreatment, converter smelting, LF refining, VD vacuum refining, continuous steel casting, heating, TMCP rolling, controlled cooling, and stacking and slow cooling processes, the finished Q550D (E) steel plate with the chemical composition described in Table 1 was obtained. The process parameters and mechanical properties are shown in Tables 4 and 5 below.

[0032] Table 1 Example 1 steel chemical composition

[0033]

Embodiment 2

[0035] Through molten iron pretreatment, converter smelting, LF refining, VD vacuum refining, continuous steel casting, heating, TMCP rolling, controlled cooling, and stacking and slow cooling processes, the finished Q550D (E) steel plate with the chemical composition described in Table 1 was obtained. The process parameters and mechanical properties are shown in Tables 4 and 5 below.

[0036] Chemical composition of table 2 embodiment 2 steel

[0037]

Embodiment 3

[0039] Through molten iron pretreatment, converter smelting, LF refining, VD vacuum refining, continuous steel casting, heating, TMCP rolling, controlled cooling, and stacking and slow cooling processes, the finished Q550D (E) steel plate with the chemical composition described in Table 1 was obtained. The process parameters and mechanical properties are shown in Tables 4 and 5 below.

[0040] The chemical composition of table 3 embodiment 3 steel

[0041]

[0042] The process route of the present invention: KR molten iron pretreatment→converter smelting→LF refining→VD vacuum smelting→continuous casting machine pouring→slab slow cooling→slab heating→slab dephosphorization→TMCP rolling→controlled cooling→steel plate straightening→stacking Pile slow cooling→surface inspection→finishing→flaw detection→performance inspection→qualified product storage.

[0043] 1.1 Steelmaking part

[0044] 1.1.1 Composition design

[0045] Since the steel plate requires high yield strength, ...

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
thicknessaaaaaaaaaa
elongationaaaaaaaaaa
Login to View More

Abstract

The invention discloses an X70 steel plate for low-cost pipe fittings and a production method thereof. The steel plate comprises the following chemical components in percentage by mass (unit, wt%): 0.04-0.08% of C, 0.20-0.40% of Si, 1.50-1.65% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, less than or equal to 0.40% of micro-alloy elements (V, Nb, Ti, Mo and Ni), less than or equal to 0.050% of Als, and the balance of Fe and residual elements. The production method disclosed by the invention comprises the following steps: hot metal pretreatment, smelting with a converter, LF (ladle furnace) refining, VD (vacuum degassing) vacuum refining, continuous casting, heating, rolling, cooling control and slow cooling of stack. The steel purity is ensured with LF+VD process by reasonably adopting the chemical component deign of low carbon, low manganese and multiple composite micro-alloy elements, and the total level of various impurities is not over 3.0; the grain size of the steel can reach 11-12th level through the treatment of rolling control, cooling control and normalization; and the 16-25 mm X70 steel plate for the pipe fittings are successfully produced through the effective implementation of abovementioned measures.

Description

technical field [0001] The invention relates to steel products, in particular to a low-cost steel X70 steel plate for pipe fittings and a production method thereof. Background technique [0002] The amount of regional energy resources in my country does not match the level of regional development. In particular, there are significant differences in energy production and consumption between the eastern coastal regions and the central and western regions. The West-East Gas Pipeline Project started on July 4, 2002. build. It is expected that after two years, a long-distance and large-diameter natural gas pipeline will extend from Tarim, Xinjiang to Baihe Town, Shanghai, becoming an energy transmission artery across China. The main line of the "West-to-East Gas Pipeline" pipeline uses nearly 2.07 million tons of steel, with a total value of nearly 10 billion yuan. However, high-quality pipeline steel has always been a "bottleneck" in the development of my country's metallurgica...

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): C22C38/04C22C33/04C21D8/02
CPCY02P10/20
Inventor 李忠波朱书成许少普张立新崔冠军高照海袁永旗于飒李亮徐璠贾涛王嘎
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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