X2CrNiMnMoN25-18-6-5

HuaNickel X2CrNiMnMoN25-18-6-5  is a high-strength and corrosion-resistant super austenitic stainless steel. Its tensile strength and yield strength can reach ≥800MPa and ≥ 420MPa, respectively; With a PE value of ≥50, it has excellent resistance to pitting and crevice corrosion in chloride environments, such as seawater.

X2CrNiMnMoN25-18-6-5 Chemical composition：

	Cr	Ni	Mo	N	Mn	C	Si	P	S	Nb
Min	23	16	3.5	0.4	3.5	≤
Max	25	18	5	0.6	6.5	0.03	1	0.03	0.01	0.1

X2CrNiMnMoN25-18-6-5 Physical properties：

Density/g·m-3	Linear expansion coefficient/10-6·K-1			Thermal conductivity/  W·(m·K)-	Specific heat capacity/J·(kg·K)-
	20～100℃	20～300℃	20～500℃
8.0	14.5	16.3	17.2	12.0	450

X2CrNiMnMoN25-18-6-5 Mechanical properties：

Projects	σp0.2/MPa	σb/MPa	δ/%	aky/]	Remarks
			LongitudinalLandscaped
Technical requirements	≥420	800～1000	≥30    ≥30	≥70	Solution treated state
0.3mmbring 0 . 2mmbring	540	942	47.9	——	Solution treatment
	533	956	46.9
sheet	546	956	43.5	—-	Solution treated state
Welded pipe	543～559	900～907	45.9～46.3		1080°Csolidsolution
Welded pipe	674～687	970～995	35.2～35.4		Soldered state

X2CrNiMnMoN25-18-6-5 Alloy properties：

This steel has the same single austenitic structure as other super austenitic stainless steels in the solid solution state, and carbides and intermetallic phases will also precipitate on the matrix when the heat working, heat treatment, welding and other processes are improper. However, because the nitrogen content of this steel is as high as 0.5%, it can significantly delay the precipitation of intermetallic phases in aged (sensitized) steels, so when the production and use process of this steel is appropriate, the plasticity, toughness and corrosion resistance of this steel will not be adversely affected.

X2CrNiMnMoN25-18-6-5 Uses of alloys：

Mainly used in the chemical and paper industries, the steel is particularly suitable for use in flue gas desulfurization units (FGD), seawater desalination units, as well as onshore and offshore oil and gas production and transmission units and pipelines due to its excellent corrosion resistance.

X2CrNiMnMoN25-18-6-5 Process performance：

Welding process: This steel is weldable and can be welded using the common method of austenitic stainless steels, but the GTAM process is recommended.

Heat treatment: The heat treatment process of HuaNickel X2CrNiMnMoN25-18-6-5  steel is heated at ≥1100 °C, and it is quickly cooled after heat preservation. It is recommended to use 1120~1170°C heating, water cooling process after heat preservation.

Relevant standards：

ASTM A240/240M-2018