UNS S44660

HuaNickel UNS S44660 is developed on the basis of 00Cr29Mo4TiNb steel in order to improve the plasticity, toughness, weldability, thermal stability and hydrogen embrittlement resistance of the steel, reduce chromium and nickel and use Ti+Nb double stabilization. Together with the aforementioned Cr29Mo4 (Ti,Nb), HuaNickel UNS S44660 is also one of the most well-known super ferritic stainless steels currently used in the heat transfer tubes of seawater condensers in power plants.

UNS S44660Chemical composition：

	Fe	Cr	Ni	Mo	Ti	V	B	C	AI	Si	Mn	P	S
Min	Bal	13	24.5	1	2.4	0.01	0.005	≤
Max		16	28.5	1.75	3.2	0.1	0.025	0.06	0.35	0.35	0.75	0.025	0.025

UNS S44660Physical properties：

Densityp /g·cm~3	Linear expansion  coefficienta/10-6·K-1			ThermalconductivityA/W·(m·K)-1			Specificheatcapacityc/J · (kg·K)-1 room temperature
	20～100℃	20～150℃	20～250 ℃	20℃	150℃	200℃
7.8	9.68	9.77	10.66	15.9	19.5	20.6	500

UNS S44660Mechanical properties：

Temperature/℃	d,z/MPa	σb/MPa	δ/%
23	517	620	25
93	455	572	24
149	392	538	23
204	365	517	21
260	345	517	21

UNS S44660Alloy properties：

The microstructure of this steel is the same as that of all super ferritic stainless steels, and the matrix structure of this steel has a body-centered cubic ferrite structure, and when heated at medium temperature (sensitized or welded heat-affected zone), there will be intermetallic compounds such as carbon, nitride and σ on the matrix, which will adversely affect the properties of the steel.

UNS S44660Uses of alloys：

This steel is mainly used for seawater corrosion-resistant pipelines, seawater condensers, heat exchangers, etc., and the price is far cheaper than copper, copper alloys and titanium.

UNS S44660Process performance：

Welding process: 00Cr27Mo3Ni2TiN steel has good welding performance. It can be welded by common welding methods of stainless steel, such as GTAW (with or without wire filling), GMAW, SMAW, etc.

Heat treatment: HuaNickel UNS S44660 The suitable heat treatment temperature is 950~1100°C, and it is quickly cooled after heating and heat preservation.

Relevant standards：

ASTM A268/A268M-2020