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
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  • 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 se

Method used

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  • 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

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Example Embodiment

[0032] Example 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 performs deep desulfurization. After treatment, the S in the molten iron is less than 0.0030%, the slag is cleaned, and the bright surface of the molten iron reaches more than 90%, which minimizes the amount of slag carried in the molten iron.

[0035] b. Converter smelting: adopts large slag double slag operation, and the converter bottom blowing adopts automatic model. Do not add iron sheet or ore two minutes before pulling carbon. Try to pull the carbon steel at one time, avoid blowing, and prevent the molten steel from over-oxidizing. Ensure that the stirring time after the converter is not less than 2 minutes before tapping. The slag binary basicity...

Example Embodiment

[0053] Example 2:

[0054] Take each component 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 inevitable impurities.

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

[0056] (b) Converter smelting: Double slag operation is adopted, the bottom blowing of the converter adopts an automatic model, and the nominal capacity 200t converter is adopted. Two-thirds of the ore is added in dephosphorization money, and the last third is added after dephosphorization; when carbon Blowing once when the mass is 0.20%, the target carbon content is ≤0.02%, the phosphorus content is ≤0.005%, the tapping temperature is 1600℃; the tapping plug and slag bar are used for double tappi...

Example Embodiment

[0060] Example 3:

[0061] Take each component according to the following mass percentages: carbon 0.08%, silicon 0.15%, manganese 0.95%, phosphorus 0.010%, sulfur 0.002%, chromium 2.0%, copper 0.15%, niobium 0.090%, titanium 0.035%, nitrogen 0.008%, and the rest 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, the sulfur content in the molten iron after treatment ≤0.0030%;

[0063] (b) Converter smelting: Double slag operation is adopted, the bottom blowing of the converter adopts an automatic model, and the nominal capacity 200t converter is adopted. Two-thirds of the ore is added in dephosphorization money, and the last third is added after dephosphorization; when carbon Blowing once when the mass is 0.20%, the target carbon content is less than 0.02%, the phosphorus content is less than 0.005%, and the tapping temperature is 1650°C; adopts slag stopper and s...

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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

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Application Information

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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
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