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

High-chrome corrosion-resisting high-strength pipeline steel and manufacturing method thereof

A high-strength pipeline steel and manufacturing method technology, applied in the direction of manufacturing converters, improving process efficiency, etc., can solve problems such as low manganese diffusion rate

Inactive Publication Date: 2016-04-13
BC P INC CHINA NAT PETROLEUM CORP +1
View PDF5 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the segregation of carbon in the steel is controlled, the high manganese content is very easy to form segregation bands, especially once the manganese segregation bands are formed, it is difficult to eliminate them by thermal processing such as heat treatment, because the diffusion rate of manganese in steel is low

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
  • High-chrome corrosion-resisting high-strength pipeline steel and manufacturing method thereof
  • High-chrome corrosion-resisting high-strength pipeline steel and manufacturing method thereof
  • High-chrome corrosion-resisting high-strength pipeline steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Take the following components by weight percentage: carbon 0.06%, silicon 0.25%, manganese 0.40%, phosphorus ≤ 0.006%, sulfur ≤ 0.003%, chromium 1.5%, copper 0.25%, niobium 0.045%, titanium 0.015%, nitrogen ≤ 0.006 %, the balance is iron and unavoidable impurities.

[0034] a. Hot metal pretreatment: KR conducts deep desulfurization. After treatment, the S in the hot metal is ≤0.0030%, the slag is cleaned, the bright surface of the hot metal reaches more than 90%, and the amount of slag in the hot metal is minimized.

[0035] b. Converter smelting: adopt double slag operation with large amount of slag, and adopt automatic model for converter bottom blowing. Do not add iron sheets or ores two minutes before pulling carbon. Try to pull the carbon out of the steel at one time, avoid spot blowing, and prevent the molten steel from being over-oxidized. Before tapping, ensure that the post-converter stirring time is not less than 2 minutes. The binary basicity of the slag a...

Embodiment 2

[0054] Each component is taken according to the following mass percentages: carbon 0.04%, silicon 0.55%, manganese 0.15%, phosphorus 0.02%, sulfur 0.003%, chromium 0.8%, copper 0.55%, niobium 0.020%, titanium 0.008%, nitrogen 0.010%, and the balance is Iron and unavoidable impurities.

[0055] (a) KR hot metal pretreatment desulfurization: oxygen blowing time is 6min, oxygen supply intensity is 20000m 3 / h, sulfur content in hot metal after treatment ≤ 0.0030%;

[0056] (b) Converter smelting: Double slag operation is adopted, the bottom blowing of the converter adopts an automatic model, a converter with a nominal capacity of 200t is used, two-thirds of the ore is added before dephosphorization, and the last third is added after dephosphorization; Blow once when the mass is 0.20%, the target carbon content is ≤0.02%, phosphorus content is ≤0.005%, and the tapping temperature is 1600°C; the slag blocking plug and the slag blocking rod are used to tap the steel; 1200kg of lime...

Embodiment 3

[0061] The components are taken according to the following mass percentages: 0.08% carbon, 0.15% silicon, 0.95% manganese, 0.010% phosphorus, 0.002% sulfur, 2.0% chromium, 0.15% copper, 0.090% niobium, 0.035% titanium, 0.008% nitrogen, and more The amount is iron and unavoidable impurities.

[0062] (a) KR hot metal pretreatment desulfurization: oxygen blowing time is 7min, oxygen supply intensity is 24000m 3 / h, sulfur content in hot metal after treatment ≤ 0.0030%;

[0063] (b) Converter smelting: Double slag operation is adopted, the bottom blowing of the converter adopts an automatic model, a converter with a nominal capacity of 200t is used, two-thirds of the ore is added before dephosphorization, and the last third is added after dephosphorization; Blow once when the mass is 0.20%, the target carbon content is ≤0.02%, phosphorus content is ≤0.005%, and the tapping temperature is 1650°C; the slag blocking plug and the slag blocking rod are used to tap the steel; 1200kg o...

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 discloses high-chrome corrosion-resisting high-strength pipeline steel and a manufacturing method thereof. The high-chrome corrosion-resisting high-strength pipeline steel is prepared from, by weight percent, 0.04%-0.08% of carbon, 0.15%-0.55% of silicon, 0.15%-0.95% of manganese, 0.030% of phosphorus or less, 0.006% of sulfur or less, 0.8%-2.0% of chrome, 0.15%-0.55% of copper, 0.020%-0.090% of niobium, 0.008%-0.035% of titanium, 0.010% of nitrogen or less and the balance iron and inevitable impurities. The high-chrome corrosion-resisting high-strength pipeline steel is different from universal low-carbon high-manganese composition design, a low-carbon, low-manganese and high-chrome alloying composition system is adopted, the manganese alloy element segregation problem caused by a high-manganese system is eliminated from compositions, and band segregation structure forming is avoided. During molten steel smelting, the refining means of KR molten iron pretreatment deep desulfuration, LF and RH refining and the like are adopted, a dual slag stopping method dephosphorization technology is adopted, a rolling control and cold control rolling process is adopted for controlling phase change temperature, the grain structure is refined, and toughness matching of the pipeline steel is guaranteed; and the produced pipeline steel has excellent corrosion resistance and higher strength and toughness.

Description

technical field [0001] The invention relates to the field of smelting and manufacturing acid corrosion-resistant high-strength pipeline steel, in particular to a high-chromium corrosion-resistant high-strength pipeline steel and a manufacturing method thereof. Background technique [0002] With the rapid development of the world economy, the consumption and dependence of the economy on oil and gas energy have increased dramatically. Because oil and natural gas are mostly produced in special areas such as remote mountains, deserts, and oceans, and areas with inconvenient transportation. Pipeline transportation is currently the most economical and efficient transportation method for oil and gas transportation. According to statistics, 70% of onshore oil and 99% of natural gas in the world rely on pipeline transportation. Oil and gas pipelines are the lifeline of the national economy. [0003] Oil and gas pipelines are developing in the direction of large-diameter high-grade s...

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
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/16C22C38/12C22C38/14C21D8/02C21C1/02C21C5/28C21C7/076B21C37/02
CPCB21C37/02C21C1/02C21C5/28C21C7/076C21D8/0226C22C38/02C22C38/04C22C38/12C22C38/14C22C38/16C22C38/18Y02P10/20
Inventor 张继明杨放池强吉玲康陈宏远齐丽华霍春勇马秋荣杨坤封辉
Owner BC P INC CHINA NAT PETROLEUM 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