JFE钢管产品及铸件研发部的高级研究员MIYATAYukio等人已开发出了一种具有良好焊接性能、力学性能和抗腐蚀性能的供总管用的马氏体不锈钢无缝管KL-HP12CR。通过降低C和N的含量可改善材料的焊接性能。通过降低C含量还能有效地提高抗CO2腐蚀性能，在160℃、2.0MPa的CO2环境下腐蚀速率低于0.127mm/y。由于添加了Mo使得抗硫化应力开裂(SSC)性能提高，这种钢管还可在PH为4.0、压力为0.001MPa的H2S环境下使用。这种钢管具有X80等级的强度和足够的作为总管使用的低温韧性。几分钟的焊后热处理（PWHT）使得C含量降低，而添加Ti则能有效阻止在热影响区的晶间应力腐蚀开裂（IGSCC）。可以预见，这种材料可作为一种节约型的、寿命周期成本低的材料被进一步应用于含有腐蚀性气体（如CO2）的液体产品的输送。

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.