GH3600 (GH600) alloy is a nickel-chromium-iron nickel-based corrosion-resistant and heat-resistant alloy.
chemical composition:
ASTM/ASME: Carbon (C)≤0.015, Manganese (Mn)≤1.00, Nickel (Ni)≥72, Silicon (Si)≤0.5 Phosphorus (P)≤0.015, Sulfur (S)≤0.015, Chromium (Cr) 14.0 ~17.0, Iron (Fe) 6.0~10.0, Aluminum (Al) ≤0.3, Titanium (Ti) ≤0.3, Copper (Cu) ≤0.5
Mechanical properties: Tensile strength Mpa 0.2% Provide yield strength Mpa Elongation A5% Brinell hardness H
B≥200
Mechanical properties at high temperature (annealed):
Temperature ºC ≥240 Tensile Strength Mpa* ≥30 Yield Strength Mpa*≤195
characteristic:
Good resistance to reduction, oxidation and nitriding medium corrosion
Good resistance to stress corrosion cracking at room temperature and high temperature
Very good resistance to dry chlorine and hydrogen chloride gases
High strength at 650°C, good forming, easy to weld; in air, the maximum operating temperature reaches 1175°C
Physical Properties: Density: 8.4g/cm3 Melting Point: 1370-1425ºC
Application areas:
Alloys are resistant to various corrosive media. Better corrosion resistance in oxidizing conditions than pure nickel (alloy 200/201) due to its chromium content. At the same time, it contains a large amount of nickel, which makes the alloy have good corrosion resistance in reducing conditions and alkaline solutions. In addition, it has strong resistance to stress corrosion cracking. It has good corrosion resistance in organic acids such as acetic acid, formic acid and stearic acid, and has moderate corrosion resistance in inorganic acids. It has good corrosion resistance in high-purity water used in primary and secondary circulation in nuclear reactors. Resistant to dry chlorine and hydrogen chloride, up to 650°C.
At high temperature, the annealed state and solid solution state of the alloy have good oxidation spalling resistance and high strength in air, and can withstand high temperature of 1100 °C in a continuous air oxidation environment. In the reducing gas (H2 or CO) without thorium (ionium), it can withstand high temperature of 1150ºC. In the oxidizing gas containing thorium (ionium), such as the air containing sulfurous acid gas, it can be used up to 815ºC. However, in the reducing gas containing hydrogen sulfide, the upper limit temperature is 535°C. In addition, it will not embrittle in the high temperature environment of 550~750ºC. Resistant to nitrogen, hydrogen, ammonia and carburizing gases. Although it is weak to wet chlorine gas and bromine gas, it is very effective for the treatment of hydrogen chloride and chlorine gas at high temperature. However, when the redox conditions are alternated, it will be corroded by some oxidizing media (such as green dead liquid).
Application range:
Evaporation tanks in petrochemical production, industrial machinery for acids and bases, catalytic regenerators
Retorts and components in heat treatment furnaces, especially in carbonizing and nitriding gases
Nuclear reactor power generation equipment, heat exchangers
Corrosion resistant to chlorine and fluorine gases: production of organic or inorganic chlorides and fluorides
Chlorine method to produce titanium dioxide
Production and use of corrosive alkali metals, especially where sulfides are used
Resistance to hydrogen fluoride corrosion: oxidative conversion of uranium to hexafluoride
Resistant to chlorine, hydrogen chloride, oxygen and carbonation corrosion: vinyl chloride monomer production
Thermowells in corrosive gases
Jet engine components, afterburning components for turbojet engines
Other parts used at high temperature
GH600 physical properties:
Density 8.43g/cm3
Melting point 1370-1430ºC
The minimum value of mechanical properties of GH600 alloy at room temperature:
Alloy Tensile Strength Rm N/mm2 Yield Strength RP0.2N/mm2 Elongation A5 % Brinell Hardness HB
GH600 585 240 30 ≤217
Metallographic structure of GH600:
The alloy was treated at 1120ºC for 2h, and only TiN nitrides and Cr7C3 carbides were present. After long-term aging at 870ºC, Cr7C3 and TiN remained in the structure, indicating that the structure of the alloy was stable.
GH600 process performance:
1. The alloy has good hot working properties, and the heating temperature for ingot forging is 1110ºC~1140ºC.
2. The average grain size of the alloy is closely related to the deformation degree and final forging temperature of the forging.
3. The alloy has good welding performance and can be connected by various methods such as original arc welding, argon arc welding, resistance welding and brazing. Large or complex welded structural parts should be annealed at 870 °C for 1h after solution welding to eliminate welding. stress.
GH600 application range The application areas are:
The alloy is a nickel-chromium-iron-based solid solution strengthened alloy, which has good high temperature corrosion resistance and oxidation resistance, excellent cold and hot processing and welding performance, and has satisfactory thermal strength and high plasticity below 700 °C. The alloy can be strengthened by cold working, and it can also be joined by resistance welding, solution welding or brazing, suitable for the production of anti-oxidation parts that can withstand low loads below 1100 °C.
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