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

Method for controlling non-metallic slag inclusion in medium and heavy plate of hydrogen-induced cracking resistance pipe line steel

A non-metallic inclusion and anti-hydrogen-induced cracking technology, which is applied in the manufacture of converters, etc., can solve the problem of unqualified anti-hydrogen-induced cracking inspection and achieve the effect of stable production

Inactive Publication Date: 2012-10-17
SHOUGANG CORPORATION
View PDF3 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for controlling the non-metallic inclusions in the medium-thick plate of anti-hydrogen-induced cracking pipeline steel, which solves the problem of unqualified inspection of anti-hydrogen-induced cracking caused by non-metallic inclusions

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
  • Method for controlling non-metallic slag inclusion in medium and heavy plate of hydrogen-induced cracking resistance pipe line steel
  • Method for controlling non-metallic slag inclusion in medium and heavy plate of hydrogen-induced cracking resistance pipe line steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Steel type X65MS, the main finished product components are: [C]=0.035wt%, [S]=0.0006wt%, the control process of non-metallic inclusions in steel is as follows:

[0021] The carbon content at the end of converter smelting is 0.028wt%, and the oxygen content in the steel is 985ppm.

[0022] During the converter tapping process, strong deoxidizer, alloy, and small-grained lime are added in sequence. The feeding process is completed 1 / 4 before the converter is tapped. The strong deoxidizer is metal aluminum, and the addition amount is 2.0kg / t steel; the particle size of small-grained lime is 15~30mm , the addition amount is 8kg / t steel; the [Al] content in the steel at the end of tapping is 0.065wt%.

[0023] Ladle furnace refining is refined by adding high-alkalinity refining slag. During the refining process, the ladle bottom blowing argon flow rate is controlled to 12NL / (min·t steel), the bottom blowing time of argon gas is 25min, and the refining slag composition is con...

Embodiment 2

[0032] Steel type X52MS, the main finished product components are: [C]=0.042wt%, [S]=0.00010wt%, the control process of non-metallic inclusions in steel is as follows:

[0033] The carbon content at the end of converter smelting is 0.032wt%, and the oxygen content in the steel is 780ppm.

[0034] During the converter tapping process, strong deoxidizer, alloy, and small-grained lime are added in sequence. The feeding process is completed 1 / 4 before the converter is tapped. Among them, the strong deoxidizer is metal aluminum, and the addition amount is 1.8kg / t steel; the particle size of small-grained lime is 15~30mm , the addition amount is 8kg / t steel; the [Al] content in the steel at the end of tapping is 0.055wt%.

[0035] Ladle furnace refining is refined by adding high-alkalinity refining slag. During the refining process, the ladle bottom blowing argon flow rate is controlled to 10NL / (min·t steel), and the bottom blowing time of argon gas is 18min. After refining, the com...

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

No PUM Login to View More

Abstract

The invention provides a method for controlling non-metallic slag inclusion in a medium and heavy plate of a hydrogen-induced cracking resistance pipe line steel, belonging to a technical field of steel-making. Process route of the method is: converter steelmaking, ladle furnace refining RH vacuum refining, Ca processing, soft blow and killing, and continuous casting. Characteristics of the technology are: controlling contents of carbon and oxygen at a smelting end-point of the converter, adding a strong aluminum deoxidizer in a tapping process; adding high alkalinity refining slag in the ladle furnace refining process, and controlling flow and time of bottom-blowing argon and components of the refining slag; controlling increase of the argon flow and vacuum treatment time in the RH vacuum refining process; controlling [Ca] content in steel in the Ca processing process; controlling the flow and time of the soft blow liquid steel and the killing time; and adopting full protection casting in the continuous casting process. The method provided in the invention has the advantages that: by adopting the technology, requirement of the non-metallic slag inclusion in the hydrogen-induced cracking resistance pipe line steel is satisfied; according to GB / T10561-2005 criterion for the non-metallic slag inclusion in the steel, various non-metallic slag inclusions in the steel are controlled within 0.5 grade; adopting a NACE standard A solution to carry out a detection of anti-HIC performance to the medium and heavy plate rolled by the casting blank, and the detection result of anti-HIC performance is qualified; and realizing batch and stable production of the medium and heavy plate in the hydrogen-induced cracking resistance pipe line steel.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular provides a method for controlling non-metallic inclusions in medium and thick plates of anti-hydrogen-induced cracking pipeline steel. Background technique [0002] Hydrogen-induced cracking-resistant pipeline steel is mainly used to transport corrosive media (H 2 S) for oil and natural gas, in addition to the higher strength and low-temperature impact properties required by ordinary pipeline steel, in order to ensure the safety of oil and gas transportation, strict requirements are placed on the HIC resistance of steel types, requiring oil and gas Pipeline steel has good HIC resistance. [0003] The main factors affecting HIC resistance in the production of hydrogen-induced cracking pipeline steel are element segregation and control of non-metallic inclusions. In order to reduce the degree of segregation, a low-carbon and low-manganese composition design system is adopted,...

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): C21C5/28C21C7/00C22C33/04
Inventor 李战军刘金刚王文军姜中行白学军朱志远柴玉国孙硕猛王东柱张建师郝宁陈霞李广双王森
Owner SHOUGANG CORPORATION
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