UNS S32750

HuaNickel UNS S32750  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.

UNS S32750 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

UNS S32750 Physical 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

UNS S32750 Mechanical properties：

UNS S32750 Alloy 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

UNS S32750 Uses 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.

UNS S32750 Process performance：

Welding process: UNS S32750  steel can be welded by GTAW, GMAW, SMAW and SAW as well as PAW (plasma welding).

Heat treatment: The suitable heat treatment temperature of HuaNickel UNS S32750  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