日本JFE鋼公司管道管用馬氏體不銹鋼無縫鋼管KL-HP12CR耐腐蝕鋼管

近年來隨著石油資源的枯竭，新開發(fā)的油井、氣井許多處于高溫、高壓環(huán)境中，而且這些工業(yè)生產(chǎn)用流體一般含有CO2，使輸送管道的腐蝕變得越來越嚴(yán)重，作為管道管用耐腐蝕材料，以往一直使用雙相不銹鋼等。雖然雙相不銹鋼具有良好的耐蝕性，但材料成本非常高，而且焊接時的焊接線能量控制困難。另一方面，馬氏體不銹鋼由于焊接性低、焊接時需要預(yù)熱、而且焊后熱處理時間長，影響管道的敷設(shè)效率，因此基本不使用這種材料，但由于馬氏體不銹鋼具有良好的耐CO2腐蝕性，而且成本比雙相不銹鋼低，因此日本JFE鋼公司通過采用先進(jìn)的煉鋼技術(shù)，降低C和N，開發(fā)了焊接性、耐蝕性和機(jī)械特性好的管道管用馬氏體不銹鋼無縫鋼管，即KL-HP12CR。降低C后可提高耐CO2腐蝕性，在溫度160℃、壓力2.0MPa的CO2腐蝕環(huán)境下，腐蝕速度降到0.127mm/年以下。另外，通過添加Mo，提高了耐硫化物應(yīng)力腐蝕裂紋性，它可用于pH4.0、壓力0.001MPa的H2S環(huán)境下。該鋼管的強(qiáng)度為80X級，用作管道管材料在實際使用上具有充分的低溫韌性。通過數(shù)分鐘的焊后熱處理、減少C含量，添加Ti，能有效防止焊接熱影響區(qū)發(fā)生晶間應(yīng)力腐蝕裂紋。該鋼管作為一種壽命周期成本低的材料今后將擴(kuò)大應(yīng)用于輸送含有CO2等腐蝕性氣體的工業(yè)生產(chǎn)用流體。

Martensitic stainless steel seamless pipe line with the new KL-HP12CR has excellent weldability, mechanical properties and corrosion resistance. By reducing the carbon and nitrogen to improve its weldability.

Martensitic stainless steel seamless pipe line with the new KL-HP12CR has excellent weldability, mechanical properties and corrosion resistance. By reducing the carbon and nitrogen to improve its weldability. Reduce the carbon content was also significantly improved the corrosion resistance of carbon dioxide, at temperatures up to 160 ℃ and 2.0MPa of the corrosion rate of carbon dioxide in the environment than 0.127mm / a. The addition of molybdenum improves resistance to sulfide stress corrosion cracking (SSC). The new pipe can be used for pH 4.0 and 0.001MPa of hydrogen sulfide environment. This strength of X80 grade steel, used in the pipeline when the actual temperature with sufficient toughness. PWHT a few minutes, reduce the carbon content and add titanium can effectively prevent the heat affected zone intergranular stress corrosion cracking (IGSCC). This steel is expected to be further used to transport liquids containing corrosive gases such as carbon dioxide is a high life-cycle cost economic material.

Reduce people's concern for oil increasing, the current oil and gas wells are being mined the temperature and pressure has reached an unprecedented height, the liquid extracted generally contain carbon dioxide, thus causing more corrosion. Therefore, to remove corrosive substances and water prior to delivery when the liquid flow lines and gathering lines to prevent pipeline corrosion by carbon dioxide becomes extremely important. In addition, these fluids often contain trace amounts of hydrogen sulfide, it is also necessary to prevent chloride stress corrosion cracking. In such a corrosive environment, with respect to carbon steel pipe material, the traditional method of corrosion protection is to inject liquid rust inhibitor, rust inhibitor used to prevent corrosion. However, this increase in production costs, especially the offshore pipeline, the less use of anti-rust agent, especially considering the life-cycle costs. Do not use anti-rust agent, another reason is concern for spill pollution. Thus, a need to use anti-rust agent and economical material. Existing pipeline with corrosion resistant alloys, including duplex stainless steel, but the drawback is high cost of materials. By contrast, the martensitic stainless steel welding is usually poor, and the need to preheat and post weld heat treatment longer. Therefore, taking into account the pipeline efficiency, martensitic stainless steel is rarely used in the pipeline. However, the martensitic stainless steel with a suitable corrosion-resistant carbon dioxide, and cheaper than the duplex stainless steel.

To this end, a Japanese steel company to take a lot of steel-making technology measures such as reducing carbon and nitrogen content, control and add alloying elements to improve the welding of martensitic stainless steel, developed with good weldability and corrosion resistance martensitic stainless steel seamless pipe used.

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TXCO has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. TXCO develops the best alloy material solutions for current and future challenges.

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