NSS447M1

HuaNickel NSS447M1 is an improved super ferritic stainless steel with ultra-low carbon, nitrogen and Ti+Nb double stabilized high-purity Cr30Mo2. The latter can be produced by off-furnace refining processes such as VOD due to the increase of the amount of C+N to ≤0.03%, which not only reduces the production cost, but also makes the NSS447M1 have better resistance to intergranular corrosion and can refine the grains due to the double stabilization of Ti+Nb, but the toughness will be lost.

NSS447M1Chemical composition：

	C	Si	Mn	Cr	Mo	Ti	Nb	AI	N
Min	≤
Max	0.007	0.02	0.2	30.2	2.08	0.17	0.19	0.09	0.012

NSS447M1Physical properties：

Density p  /g·cm-3	Linear expansion coefficientg/℃-1 (20～100℃)	Thermal conductivityA/ W·(m·K)-1100℃	Specific heat capacityc /J·(kg·℃)-1	Resistivity/μΩ ·cm(20℃)
7.64	9.7×10-6	17.8	0.46×10-6	65

NSS447M1Mechanical properties：

Materials and Condition	Plate and tube specifications	σp0.2/MPa	σb/MPa	δ/%	ψ/%	hardness(HV)
高纯Cr30Mo2 Annealed state(900℃× 10～15min,Water)	Hot rolled plate8mm	329～588	529～676	21～22	66～70	190～280
	Cold-rolled plate3mm	392～894	539～863	32	53～72	180～300
	After the cold-rolled plate is welded	392～412	539～559
NSS447M1 Annealed state	Cold-rolled plate1.5mm	431	568	28		192
	Pipe wall thickness2mm	560	610	37		205

NSS447M1Alloy properties：

NSS447M1 is a typical high-chromium-molybdenum ferritic stainless steel, their microstructure is a pure ferrite structure with a body-centered cube, and there are α’ phases and σ(x) intermetallic phases and carbon and nitride phases on the matrix during the aging process.

NSS447M1Uses of alloys：

It can be used as a heat exchange equipment for water medium containing Cl- (including seawater) as coolant; It can be used for evaporators in the diaphragm alkali production process, acetic acid, urea-resistant devices and components, roofs (including eaves), curtain walls and various decorative materials for large coastal buildings (airports, restaurants, large landmark buildings, etc.).

NSS447M1Process performance：

Welding process: HuaNickel NSS447M1 weldability is good, there is no intergranular corrosion tendency after welding, and there is no obvious difference in corrosion resistance before and after welding in some corrosive media.

Heat treatment: The heat treatment process of HuaNickel NSS447M1 steel is 900~1050 °C heating, heat preservation and quenching.

Relevant standards：

JIS G 4305-2021