022Cr25Ni7Mo4WCuN

In the early days (early 80s of the 20th century), this steel was used as cast steel to replace the second-generation duplex stainless steel  00Cr22Ni5Mo2N (2205) with insufficient corrosion resistance. In the late 80s, it began to be used as a texturing material for pipeline systems, and subsequently became an important corrosion-resistant material for oil and gas development, seawater environments, flue gas desulfurization (FGD), desalination, chemical and other applications.

022Cr25Ni7Mo4WCuN Chemical composition：

	Cr	Ni	Mo	N	Cu	C	Si	Mn	S	P
Min	24	6	3	0.2	0.5	≤
Max	26	8	4	0.3	1	0.03	1	1	0.02	0.035

022Cr25Ni7Mo4WCuNPhysical properties：

Densityg/g·cm-3	Specific heat capacity/J·(kg·K)-1	Resistivity /10-6Ω ·m	Young’s modulus of elasticity/GPa
7.84	–	0.85	19

022Cr25Ni7Mo4WCuNMechanical properties：

Plate thickness/mm	db/MPa	do.2/MPa	δs/%	hardness(HRC)	Impact value (V-type)Akv/J
					20℃	-30℃
10	874	671	734	42	241	207
12	865	690	737	38	227	227
19	843	647	701	40	211	183
34	853	627	700	32	241	248

022Cr25Ni7Mo4WCuNAlloy properties：

Like other super duplex stainless steels, the microstructure of this steel is also a duplex structure with a α/γ close to 1 under solution conditions, but there will also be intermetallic phases and nitride precipitation on the steel matrix during cooling from high temperature to room temperature, including incorrect heat working, heat treatment and welding processes.

022Cr25Ni7Mo4WCuNUses of alloys：

022Cr25Ni7Mo4WCuN is mainly used for offshore oil and gas exploitation, in the power station flue gas desulfurization, petrochemical engineering and fertilizer industry, the manufacture of reactors, containers, various heat exchangers, pipelines, pumps, valves, etc.

022Cr25Ni7Mo4WCuNProcess performance：

Soldering process: Soldering is performed using SMAW, GTAW and SAW methods.

Heat treatment: 022Cr25Ni7Mo4WCuN suitable heat treatment temperature is 1000~1100 °C, fast cooling after heat preservation.

Relevant standards：ASTM A1082/A1082M-2016