UNS S32707

HuaNickel UNS S32707 is an extra super duplex stainless steel. Super duplex stainless steel was introduced after 2000 to solve the shortcomings of local corrosion performance and strength of heat chloride resistance of super duplex stainless steel. The RE value of HuaNickel UNS S32707 can be as high as 49, and the high nitrogen, molybdenum, chromium content and duplex structure make the yield strength and tensile strength of this steel pipe as high as 800MPa and 1000MPa respectively, and the plastic and toughness are also maintained at a high level required for engineering applications.

UNS S32707 Chemical composition：

	Cr	Ni	Mo	N	C	Mn	Si	S	P
Min	26	5.5	4	0.3	≤
Max	29	9.5	5	0.5	0.03	1.5	1	0.02	0.035

UNS S32707 Physical properties：

Density

7.8g/cm³

UNS S32707 Mechanical properties：

Heat treatment	Tensile strengthσb/MPa	Yield point  δ₅/%	Elongation after break %	Hardness HBW
anneal	≥9.5	≥5	≥0.5	≤318

UNS S32707 Alloy properties：

The structural characteristics of UNS S32707 steel are not significantly different from those of super duplex stainless steels such as 2507.

UNS S32707 Uses of alloys：

HuaNickel UNS S32707 steel has excellent resistance to pitting, crevice corrosion and stress corrosion in chloride environments, and is especially suitable for the manufacture of heat exchanger equipment with seawater and Cl- as the working medium and cooling medium. For example, in the atmospheric distillation unit of the refinery, the overhead heat exchanger tube bundle has been replaced by UNS S32707 and the seawater condenser cooling pipe made by HuaNickel UNS S32707 has achieved satisfactory results.

UNS S32707 Process performance：

Welding process: HuaNickel UNS S32707 has good weldability, and UNS S32707 is mostly used for heat transfer tubes of heat exchangers. The welding of this steel pipe to the tube sheet is recommended to be welded by TIG/GTAW (tungsten inert gas/tungsten inert gas arc welding), and manual welding and TIG automatic welding can also be used

Relevant standards：ASTM A511/A511M-2020、ASTM A789、A79