NS112
The Cr content in the NS112 alloy is usually 15-25%, the nickel content is 30-45%, and contains small amounts of aluminum and titanium.
The NS112 alloy is in the austenite single-item region after rapid cooling from high temperature, so the use state is a single austenite structure.
The alloy has high chromium content and sufficient nickel content, so it has high high temperature corrosion resistance and is widely used in industry.
In chloride, low-concentration NaOH aqueous solution and high temperature and high pressure water, it has excellent resistance to stress corrosion cracking, so it is used to manufacture equipment that is resistant to stress corrosion cracking.
Corresponding grades of NS112 at home and abroad:
China GB US UNS Germany SEW VDIUV UK BS
Incoloy 800H NS112 N08810 W.Nr.1.4958X5 NiCrAlTi 31-20 NA15(H)
NS112 supply specifications:
Round bars, bars, strips, pipes, valve seats, balls, flanges and forgings are negotiated and supplied
NS112 chemical composition:
Alloy C Mn Si P S Cr Ni Cu Ti Al Fe
NS112 0.05~0.10 ≤1.50 ≤1.00 ≤0.030 ≤0.015 19.0~23.0 30.0~35.0 ≤0.75 0.15~0.60 0.15~0.60 38.0~47.0
NS112 physical properties:
Density 8.0g/cm3
Melting point 1350-1400ºC
The minimum value of mechanical properties of NS112 alloy at room temperature:
Alloy Tensile Strength Rm N/mm2 Yield Strength RP0.2N/mm2 Elongation A5 %
800 450 180 35
NS112 has the following features:
1. Excellent corrosion resistance in extremely high temperature aqueous media up to 500°C
2. Good resistance to stress corrosion
3. Good workability
Metallographic structure of NS112:
Incoloy 800H has a face-centered cubic lattice structure. Very low carbon content and increased Ti:C ratio increase structural stability and maximum resistance to sensitization and intergranular corrosion. A low-temperature annealing around 950°C ensures a fine-grained structure.
Corrosion resistance of NS112:
Incoloy 800H is resistant to many corrosive media. Its high nickel content makes it resistant to stress corrosion cracking in aqueous corrosion conditions. The high chromium content provides better resistance to pitting and crevice corrosion cracking. The alloy has good corrosion resistance to nitric acid and organic acids, but limited corrosion resistance in sulfuric acid and hydrochloric acid. Good corrosion resistance in oxidizing and non-oxidizing salts, in addition to the potential for pitting corrosion in halides. It also has good corrosion resistance in water, steam and mixtures of steam, air and carbon dioxide.
NS112 process performance and requirements:
Thermal processing
1. The temperature range is 1200ºC~950ºC, and the cooling method is water quenching or rapid air cooling.
2. In order to obtain good performance and creep resistance, solution treatment should be carried out after hot working.
3. The material can be directly sent into the furnace that has been heated up to 1200ºC, and it can be released quickly after being kept for a sufficient time, and then hot processed in the specified temperature range. When the material temperature drops below the thermal processing temperature, reheating is required.
cold working
1. The work hardening rate is greater than that of austenitic stainless steel, so it is necessary to select the processing equipment. Cold-worked materials should be in solution heat-treated state, and intermediate annealing should be performed when the amount of cold work is large.
2. If the amount of cold working is greater than 10%, the workpiece needs to be subjected to secondary solution treatment.
NS112 welding process
It is suitable for welding with the same material or other metals by any traditional welding process, such as tungsten electrode inert gas welding, plasma arc welding, manual sub-arc welding, metal inert gas welding, molten inert gas welding, and pulse arc welding. Program. If manual arc welding is used, it is recommended to use (Ar+He+H2+CO2) as the shielding gas.
NS112 Application Scope Application areas are:
1. Nitric acid condenser - resistant to nitric acid corrosion
2. Steam heating tube - good mechanical properties
3. Heating element tube - good mechanical properties
For applications up to 500°C, the alloy is supplied as annealed.
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