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RE (rare earth)-containing moisture and H2S corrosion resistant L450QS pipeline seamless steel pipe and production method thereof

A technology for seamless steel pipes and production methods, applied in the direction of pipes/pipe joints/fittings, pipes, rigid pipes, etc., which can solve the problems of difficulty in smelting and low melting point

Inactive Publication Date: 2013-07-17
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is a deficiency that cannot be overcome by the electric furnace production process using scrap steel as raw material. Due to the low melting point of Cu element, this will cause certain difficulties in the smelting and rolling process.

Method used

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  • RE (rare earth)-containing moisture and H2S corrosion resistant L450QS pipeline seamless steel pipe and production method thereof
  • RE (rare earth)-containing moisture and H2S corrosion resistant L450QS pipeline seamless steel pipe and production method thereof
  • RE (rare earth)-containing moisture and H2S corrosion resistant L450QS pipeline seamless steel pipe and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Raw materials by weight percentage: 90% blast furnace hot metal, 10% high-quality steel scrap.

[0054] The sequence of the production process is: molten iron pretreatment→top-bottom combined blowing converter smelting→LF furnace refining→VD vacuum treatment→round billet continuous casting→cutting→tube billet heating→piercing→continuous rolling→fixing (stretching and reducing) diameter→cooling→ Sawing → heat treatment → straightening → flaw detection → chamfering.

[0055] The specific production process is briefly described as follows:

[0056] 90 tons of blast furnace molten iron was pretreated with "metal magnesium powder" for desulfurization and deoxidation, so that the S content in the molten iron was reduced to less than (weight percent) 0.010%;

[0057] Mix the 90 tons of pretreated molten iron into a 100-ton top-bottom combined blown converter, add 10 tons of high-quality steel scrap, and then use the single slag process for smelting. The final slag basicity is...

Embodiment 2

[0082] The ratio of raw materials, production process, etc. and other process indicators of Example 2 are the same as those of Example 1, the difference is the chemical composition content, heat treatment system and steel pipe specification of the tube blank (the specification is ф114.3mm×7.90mm) , the chemical composition test results (weight %) are shown in Table 5:

[0083] Table 5 Test results of chemical composition (weight %)

[0084]

[0085] The heat treatment system is: heat preservation at 900±10°C for 35 minutes and then water quenching, and tempering temperature at 610±20°C for 60 minutes and air cooling.

[0086] Steel pipe straightening temperature is 512 ℃.

[0087] The test results of mechanical properties of seamless steel pipes are shown in Table 6.

[0088] Table 6 Test results of mechanical properties of steel pipes

[0089]

[0090] The structure is tempered sorbite, the grain size is grade 9, and the residual stress measured by ring cutting metho...

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Abstract

The invention relates to an RE (rare earth)-containing moisture and H2S corrosion resistant L450QS pipeline seamless steel pipe and a production method thereof. The seamless steel pipe is characterized by taking 90wt% of blast furnace molten iron and 10wt% of high-quality scrap steel as raw materials; a pipe billet is prepared from the following chemical components by weight percent: 0.06-0.12% of C, 0.10-0.30% of Si, 0.80-1.10% of Mn, not more than 0.015% of P, not more than 0.005% of S, 0.10-0.30% of Cr, 0.10-0.15% of Mo, 0.03-0.09% of V, 0.01-0.03% of Ti, 0.01-0.04% of Al, 0.0005-0.0100% of RE, not more than 0.10% of Cu and the balance being matrix Fe and non-detectable trace impurity elements; the mechanical properties of the product are as follows: the yield strength is 550-600MPa, the residual stress is not more than 30MPa, the impact value is not less than 200J / cm<2> and the grain size is not less than 8.5; the sulfide stress corrosion (SSC) properties are as follows: the constant stress is 0.8Rt0.5(388MPa), and soaked in an H2S saturated solution (solution A), samples are not fractured after continuous sampling for 720 hours; and the hydrogen induced crack (HIC) properties are as follows: the crack sensitivity ratio (CSR) is equal to 0, the crack length ratio (CLR) is equal to 0 and the crack thickness ratio (CTR) is equal to 0. The seamless steel pipe has the advantages that the seamless steel pipe has high matching for strength and toughness, fine grains and good moisture and H2S corrosion resistance.

Description

Technical field: [0001] The invention belongs to the field of ferrous metal smelting and metal pressure processing, and relates to a rare earth-containing moisture-resistant H 2 S corroded L450QS pipeline seamless steel pipe and its production method. Background technique: [0002] Pipeline transportation has been widely used because of its economical, high-efficiency, uninterrupted and pollution-free characteristics. In order to realize long-distance transportation of pipelines, high-grade steel line pipes are required. Due to the existence of water and H 2 S gas, which brings serious corrosion problems to the pipeline and is difficult to predict. Low temperature wet hydrogen sulfide corrosion mainly has two damage types: stress corrosion corrosion (SSC) and hydrogen induced cracking (HIC). Both of these two damage types have caused serious accidents in oil and gas pipelines, and the moisture-resistant H 2 S corrosion is contradictory to high steel grades. For this reas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/04C21D8/10F16L9/02
CPCY02P10/20
Inventor 刘金丰小冬贺景春张行刚姜涛郝振宇姜海龙石晓霞马爱清
Owner INNER MONGOLIA BAOTOU STEEL UNION
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