NS3105、NS315

Overview of NS3105 (NS315) corrosion-resistant alloy

NS3105 is an alloy with better resistance to stress corrosion, etc. under the conditions of the heat transfer tube of the pressurized water reactor evaporator. Since 1982, this alloy has begun to manufacture U-tubes for evaporators of pressurized water power reactors. At present, it has been widely used in evaporators of pressurized water reactor nuclear power plants abroad and began to be applied to some components of reactor internal components. At present, this alloy is also used in the evaporator heat transfer tubes of large pressurized water reactor nuclear power plants that have been introduced from abroad.

NS3105 (NS315) alloy has excellent resistance to intergranular corrosion and resistance to intergranular stress corrosion cracking, and is mainly used as a heat transfer tube material for steam generators in PWR nuclear power plants.

The materials for the heat transfer tubes of steam generators in PWR nuclear power plants have gone through a development process, including 304 austenitic stainless steel, 600 alloy, 800 alloy and 690 alloy.

Research on corrosion failure of 600 alloy in service shows that intergranular corrosion and intergranular stress corrosion cracking are the main problems. Alloy 690 is used as steam generator for PWR nuclear power plant

There has been no report of damage to the heat transfer tube material of the living organism since it was put into use in the 1990s.

 

NS3105 (NS315) corrosion resistant alloy chemical composition (%)

%	Ni	Cr	Fe	C	Mn	Si	Cu	P	S
Min.	margin	27	7
Max.		31	11	0.05	0.5	0.5	0.5	0.015	0.015

 

NS3105 (NS315) corrosion resistance alloy physical properties

Density 8.19g / cm3

Melting point 1343-1377 ℃

Young's modulus 211GPa

Poisson's ratio 0.289

Yield strength 350MPa

Tensile strength 700MPa

45% elongation

 

Main applications of NS3105 (NS315) corrosion resistant alloy

The NS3105 (NS315) alloy is mainly used as a heat transfer tube material for steam generators in PWR nuclear power plants, and is the core technology of steam generators. At present, among the already operating PWR nuclear power plant units in China, only Q315 is used in the first phase of NS315 alloy, while Qinshan Phase II, Daya Bay and Ling'ao nuclear power plants all use NS315 alloy as the heat transfer tube material for steam generators.