022Cr25Ni7Mo3WCuN

022Cr25Ni7Mo3WCuN is a well-known super duplex stainless steel, the amount of chromium, molybdenum and nitrogen in the steel is higher than that of the second generation of duplex stainless steel, and its PE value can reach 42, so it has excellent pitting and crevice corrosion resistance.

022Cr25Ni7Mo3WCuN Chemical composition：

	Ni	Cr	Mo	N	C	Si	Mn	S	P
Min	6	24	3	0.24	≤
Max	8	26	5	0.32	0.03	0.8	1.2	0.02	0.03

022Cr25Ni7Mo3WCuNPhysical properties：

Densityp/(g/cm³)	Thermal conductivityλ/W·(m·K)-			Elastic modulusE/MPa	Linearexpansioncoefficient(20～100℃)a/10-6K-1
	20℃	100℃	300℃
7.8	14	15	18		13.0

Steel varieties	σb/MPa	σp0.2/MPa	δ₅/%	hardness(HV)	Ak/J
Wall thickness<20mmPipe	800～1000	≥550	≥25	290
Hot-rolled plates	930	530	20		≥60

022Cr25Ni7Mo3WCuNMechanical properties：

022Cr25Ni7Mo3WCuNAlloy properties：

After suitable solution treatment, the microstructure of this steel has an ideal duplex structure with a α/γ ratio of about 50/50. When the solution temperature is above 1050°C, the number of ferrite phases in the steel will increase with the increase of temperature, but due to the high nitrogen content, the phase ratio of steel below 1300°C will not change significantly

022Cr25Ni7Mo3WCuNUses of alloys：

It is mainly used in oil and gas pipelines, tanks and tanks of offshore chemical carriers, towers, tanks, containers and heat exchangers in the chemical industry, petrochemical industry, oil refining industry and seawater environment, and can replace high-grade austenitic stainless steel and high-nickel corrosion-resistant alloys.

022Cr25Ni7Mo3WCuNProcess performance：

Welding process: 022Cr25Ni7Mo3WCuN steel can be welded by GTAW, GMAW, SMAW and SAW as well as PAW (plasma welding).

Heat treatment: The suitable heat treatment temperature of 022Cr25Ni7Mo3WCuN steel is 1050~1120 °C, and there must be enough cooling rate after heat preservation to prevent equal precipitation between metals.

Relevant standards：

ASTM A240/ASME SA-240、ASTM A276、ASTM A182/ASME SA-182、ASTM A312/ASMES A312