Q1: What materials do 2.4360 and 401 represent respectively, and what are their basic characteristics?
A1: 2.4360 is the European W.Nr. designation for Monel 400 (UNS N04400), a nickel-copper alloy with excellent corrosion resistance in seawater and reducing environments. 401 stainless steel is a ferritic-martensitic, low-carbon stainless steel with good formability, weldability, and moderate corrosion resistance. The two materials differ greatly in composition and application fields.
Q2: What are the main differences in corrosion resistance between 2.4360 alloy pipe and 401 stainless steel pipe?
A2: 2.4360 (Monel 400) has outstanding corrosion resistance in seawater, hydrofluoric acid, fluorides, and alkaline media, and is highly resistant to pitting and stress corrosion. 401 stainless steel only offers general atmospheric and mild aqueous corrosion resistance; it is not suitable for strong corrosion or high-salinity marine environments.
Q3: What are the typical mechanical property differences between these two pipes?
A3: 2.4360 alloy pipe features high ductility, good toughness, and medium strength, with stable performance at both low and moderately high temperatures. 401 stainless steel pipe has higher hardness and strength after proper heat treatment, with good impact resistance and fatigue performance, but lower corrosion resistance.
Q4: In which industries and applications are 2.4360 and 401 pipes mainly used?
A4: 2.4360 pipes are widely used in marine engineering, seawater systems, chemical processing, oil and gas, and valves handling corrosive media. 401 stainless steel pipes are mainly used in automotive exhaust systems, general engineering piping, heat exchangers, and structural components requiring moderate strength and formability.
Q5: What are the key differences in welding and heat treatment for 2.4360 and 401 pipes?
A5: 2.4360 requires matching nickel‑copper welding wires and low heat input to avoid hot cracking; it is usually used in the annealed condition. 401 stainless steel can be welded with conventional stainless steel electrodes and may undergo annealing or quenching‑tempering to adjust strength and hardness according to application requirements.
