Ma'anshan Iron and Steel Co., Ltd. has applied for a patent entitled "Steel for seamless steel tubes with high strength, toughness, and resistance to hydrogen sulfide corrosion, and its production method, seamless steel tube heat treatment process, and application", with publication number CN 119776736 A. The application date is January 2025.

The patent abstract shows that the present invention provides a steel for seamless steel tubes with high strength, toughness, and resistance to hydrogen sulfide corrosion, as well as its production method, seamless steel pipe heat treatment process, and application. The composition is: Cr：1.00～1.30％，Ni：0.50～0.70％，Mo：0.90～1.10％，Al：0.020～0.050％，V：0.10～0.20％，Nb：0.10～0.20％，C：0.20～0.25％，Si：0.15～0.30％，Mn：0.50～0.70％，P≤0.010％，S≤0.0015％， The remaining amount is Fe and inevitable impurities. The present invention adopts Cr Mo Ni system supplemented with microalloying elements such as Nb and V to improve strength and toughness, and enhance resistance to SSC. And through two tempering treatments, the dislocation density of the material was reduced, and the loading strength of the NACETM0177 standard A solution was evaluated.

Ma'anshan Iron and Steel Co., Ltd., established in 1993 and located in Ma'anshan City, is an enterprise mainly engaged in the smelting and rolling processing of ferrous metals. The registered capital of the enterprise is 7746.937986 million RMB, and the paid in capital is 383.056 million RMB. Through big data analysis by Tianyancha, Ma'anshan Iron and Steel Co., Ltd. has invested in 47 enterprises and participated in 5000 bidding projects. In terms of property clues, there are 23 trademark information and 4949 patent information. In addition, the company also has 265 administrative licenses.