Pipeline steel with high acid medium corrosion resistance and production method thereof

A technology of acidic medium and production method, applied in the direction of manufacturing converters, etc., to achieve the effect of reducing production costs, optimizing process parameters, reducing types and additions

Pending Publication Date: 2021-08-27
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to produce pipeline steel products with acid medium corrosion resistance higher than the HIC and SSC requirements in the acid resistance standard API Spec 5L (version 46) PSL2, and adapt to the increasingly harsh oil transportation environment has become a technical difficulty that needs to be solved urgently

Method used

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  • Pipeline steel with high acid medium corrosion resistance and production method thereof
  • Pipeline steel with high acid medium corrosion resistance and production method thereof
  • Pipeline steel with high acid medium corrosion resistance and production method thereof

Examples

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Effect test

Embodiment 1

[0031] For pipeline steel with a thickness of 3mm and high resistance to acidic medium corrosion, the steelmaking is carried out according to the design process, and the steel rolling is produced according to the original process. The composition and process parameters of the finished product are C: 0.035%, Si: 0.20%, Mn: 1.30%, P: 0.008%, S: 0.001%, Als: 0.035%, Nb: 0.050%, Mo: 0.10%, Ti: 0.010%. The amount of steel scrap added to the converter is 30 tons, and the amount of oxygen blowing is 13000Nm 3 , the end point oxygen is 700ppm, the amount of lime added in the blowing process is 12 tons, the tapping C: 0.025%, the tapping P: 0.007%, the tapping temperature is 1610°C, and the amount of lime added in the tapping process is 0.75 tons. The amount of lime added in the LF refining process is 2.4 tons. At the same time, the first-level computer operating system is used to automatically adjust the opening of the air valve to ensure the slight positive pressure in the ladle furn...

Embodiment 2

[0035] For pipeline steel with a thickness of 3mm and high resistance to acidic medium corrosion, the steelmaking is carried out according to the design process, and the steel rolling is produced according to the original process. The composition and process parameters of the finished product are C: 0.025%, Si: 0.10%, Mn: 1.10%, P: 0.009%, S: 0.0008%, Als: 0.015%, Nb: 0.030%, Mo: 0.16%, Ti: 0.020%. 25 tons of steel scrap added to the converter, 14000Nm of oxygen blowing 3 , the end point oxygen is 900ppm, the amount of lime added in the blowing process is 13 tons, the tapping C: 0.020%, the tapping P: 0.008%, the tapping temperature is 1630°C, and the amount of lime added in the tapping process is 1 ton. The amount of lime added in the LF refining process is 2.5 tons. At the same time, the first-level computer operating system is used to automatically adjust the opening of the air valve to ensure the slight positive pressure in the ladle furnace during the entire smelting proc...

Embodiment 3

[0039] For pipeline steel with a thickness of 3mm and high resistance to acidic medium corrosion, steelmaking is carried out according to the design process, and steel rolling is produced according to the original process. The composition and process parameters of the finished product are C: 0.030%, Si: 0.15%, Mn: 1.20%, P: 0.008%, S: 0.0006%, Als: 0.020%, Nb: 0.044%, Mo: 0.14%, Ti: 0.015%. 25 tons of steel scrap added to the converter, 13500Nm of oxygen blowing 3 , the end point oxygen is 800ppm, the amount of lime added in the blowing process is 12.5 tons, the tapping C: 0.022%, the tapping P: 0.007%, the tapping temperature is 1620°C, and the amount of lime added in the tapping process is 0.9 tons. The amount of lime added in the LF refining process is 2.45 tons. At the same time, the first-level computer operating system is used to automatically adjust the opening of the air valve to ensure the slight positive pressure in the ladle furnace during the entire smelting proces...

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Abstract

The invention discloses pipeline steel with high acid medium corrosion resistance. A steel belt is prepared from the following chemical components in percentage by mass: 0.025%-0.035% of C, 0.10%-0.20% of Si, 1.10%-1.30% of Mn, less than or equal to 0.012% of P, less than or equal to 0.001% of S, 0.015%-0.035% of Als, 0.030%-0.050% of Nb, 0.10%-0.16% of Mo, 0.010%-0.020% of Ti and the balance of Fe and inevitable impurities. A production method comprises the steps of molten iron pre-desulfurization, converter-LF-RH-continuous casting, heating, rolling, cooling and coiling. The structure of the produced pipeline steel with high acid medium corrosion resistance is fine and uniform acicular ferrite and a small amount of pearlite, the grain size is 12-13 grades, the CTOD characteristic value at the temperature of -40 DEG C is larger than or equal to 0.75 mm, the HIC experiment total CLR is 0, CTR is 0, CSR is 0, the SSC experiment actual yield strength is 90%, the stress qualification rate is 100%, all performance indexes are far strict than standard requirements, and the corrosion resistance comprehensive performance is excellent.

Description

technical field [0001] The invention relates to a production method of pipeline steel, in particular to a pipeline steel with high acid medium corrosion resistance and a production method thereof. Background technique [0002] At present, with the rapid economic growth, the exploitation of energy media such as oil and natural gas has been driven. The exploitation of neutral oil and gas on land has reached decades. Human beings have gradually turned their attention to the field of sour oil and gas. contains a certain amount of H 2 S and other acid gases, although natural gas has been cleaned before transmission, H 2 Pipeline corrosion caused by the presence of S and water is still inevitable. This corrosion damage is mainly caused by hydrogen-induced cracking, sulfur-induced stress corrosion cracking and electrochemical corrosion. In order to ensure the safety of oil and gas transportation, the corrosion resistance of pipeline steel, especially the resistance to hydrogen-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21C5/28C21C7/072C21C7/10C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/04C21C5/28C21C7/072C21C7/10C21D8/0205C21D8/0226C21D2211/005C21D2211/009
Inventor 孙毅李耀强李俊生贾改风李冠楠李红俊裴庆涛亢庆锋
Owner HANDAN IRON & STEEL GROUP
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