UNS S44735

HuaNickel UNS S44735 is one of the earliest super ferritic stainless steels, which solves the serious corrosion damage problems of commonly used chromium-nickel austenitic stainless steels in Cl-containing water media (including seawater), such as pitting, crevice corrosion and stress corrosion. The steel has long been used in media environments such as power plants, seawater condensers and desalination plants, and can replace super austenitic stainless steels, titanium alloys and copper alloys.

UNS S44735Chemical composition：

	C	Si	Mn	Cr	Ni	Mo	S	P	N	Ti+Nb	Co
Min	–	–	–	–	–	–	–	–	–	–	–
Max	0.02	0.4	0.5	29	0.3	4	0.01	0.03	0.2	0.5	0.03

UNS S44735Physical properties：

Elastic modulus/GPa	Thermal conductivity/W·(m·℃)-	Coefficient of thermal expansion/10~6·℃-1	Density /g·cm-3
200	17	17.2	7.67

UNS S44735Mechanical properties：

Material grade	Mechanical properties
	σb/MPa	σp0.2/MPa	δ/%
UNS S44735	655	552	20

UNS S44735Alloy properties：

Due to the high amount of chromium and molybdenum in HuaNickel UNS S44735, σ phases, nitrides and carbides will precipitate during medium temperature aging (e.g., welding, hot working and thermoforming, etc.), resulting in a decrease in plasticity, toughness and corrosion resistance of this steel, for which measures need to be taken to prevent this steel during production and welding.

UNS S44735Uses of alloys：

It is mainly used in seawater condensers in power plants, and has achieved good long-term use results.

UNS S44735Process performance：

Welding process: HuaNickel UNS S44735 has good weldability, and this steel can produce welded pipes. In the manufacture of heat exchange equipment, such as seawater condensers, UNS S44735 welds tubes to tubesheets without difficulty.

Heat treatment: The heat treatment process of this steel is 950~1100 °C heating, heat preservation and fast cooling.

Relevant standards：ASTM A240/A240M-2020