Nickel-based alloys are alloys that have a combination of high strength and certain resistance to oxidation and corrosion at high temperatures of 650 to 1000 °C. Nickel alloy seamless tubes are widely used in petroleum, chemical, high pressure boilers, nuclear power, aviation, marine engineering, environmental engineering and other fields.
Compared with ordinary stainless steel, nickel-based alloys have superior high temperature resistance, corrosion resistance and high strength properties. It is suitable for strong acid and alkali and high temperature environments under severe conditions.
According to the main performance, it can be divided into nickel-based heat-resistant alloy, nickel-based corrosion-resistant alloy, nickel-based wear-resistant alloy, nickel-based precision alloy and nickel-based shape memory alloy.
Nickel-based heat-resistant alloy: nickel-chromium (Ni-Cr) alloy, the main alloying elements are chromium, tungsten, molybdenum, cobalt, aluminum, titanium, boron, zirconium and the like. Among them, Cr, Ai and the like mainly play an antioxidant role, and other elements have solid solution strengthening, precipitation strengthening and grain boundary strengthening. Typical representative materials are: Incoloy alloys such as Incoloy 800, Inconel 600 and the like.
Nickel-based corrosion-resistant alloy: The main alloying elements are copper, chromium and molybdenum. Has a good overall performance, resistant to a variety of acid corrosion and stress corrosion. These nickel-based corrosion-resistant alloys are mainly used in the manufacture of various corrosion-resistant environmental parts such as petroleum, chemical, and electric power. Typical representative materials are: Hastelloy, that is, Hastelloy, such as Hastelloy C-276; Monel alloy, Monel, Bimenel 400, and the like.
Nickel-based wear-resistant alloy: The main alloying elements are chromium, molybdenum, tungsten, and also a small amount of antimony, bismuth and indium. In addition to its wear resistance, it is also resistant to oxidation, corrosion and welding.
Nickel-based precision alloys include nickel-based soft magnetic alloys, nickel-based precision resistance alloys, and nickel-based electrothermal alloys.
Nickel-based shape memory alloy: a nickel alloy containing 50% (at)% of titanium. Its recovery temperature is 70 ° C, shape memory effect is good. It is mostly used to manufacture self-expanding structural parts used in spacecraft, self-exciting fasteners used in the aerospace industry, and the like.
With the development of the global industry, especially for some special environments or special requirements, the performance requirements for seamless pipes will become higher and higher. Ordinary stainless steel seamless pipes can not meet the demanding requirements, and the superior performance of nickel-based alloy seamless pipes makes them more and more in future applications!
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