Corrosion & fatigue nickel alloy (marketing department of Shanghai HY Industry Co., Ltd)
Elements in the alloy can change the performance and process performance of the alloy material, so that the alloy material can obtain more excellent or special properties. This is mainly because the addition of alloying elements changes the internal structure of the alloy.
The addition of alloying elements produces the interaction between alloying elements and iron, carbon and alloying elements, changes the stability of each phase in the alloy, and produces many new phases, thereby changing the original structure or forming a new structure. . Differences in atomic structure, atomic size, and crystal lattice between these elements are the source of these changes.
01 Physical properties of metallic nickel
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Nickel is a silver-white metal with magnetic properties and good plasticity and good corrosion resistance. It is a hard, ductile and ferromagnetic metal.
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Nickel is a ferrophilic element and is approximately silver-white. It is highly polished and corrosion resistant. After dissolving in nitric acid, it turns green. Mainly used in alloys (such as nickel steel and nickel silver) and as catalysts (such as Raney nickel, especially as a catalyst for hydrogenation)
02 The role of nickel in alloys
Influence of Nickel on the Microstructure of Alloys
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Nickel and iron can be infinitely dissolved, and nickel expands the austenite region of iron and is the main alloying element for forming and stabilizing austenite.
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Reduce the critical transition temperature, reduce the diffusion rate of each element in the steel, and improve the hardenability.
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To reduce the carbon content of eutectoid pearlite, its effect is second only to nitrogen and stronger than manganese. The effect in reducing the martensitic transformation temperature is about half that of manganese.
Effect of Nickel on Mechanical Properties of Alloys
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Strengthen the ferrite and refine and increase the pearlite, improve the strength of the alloy, and have little effect on the plasticity of the alloy.
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The carbon content of nickel-containing alloys can be appropriately reduced, thereby improving toughness and plasticity.
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Improve the fatigue properties of the alloy and reduce the sensitivity of the steel to notches.
Influence of Nickel on Physical, Chemical and Technological Properties of Alloys
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Reduce the thermal conductivity and electrical conductivity of steel.
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Steel with a mass fraction of nickel less than 30% is paramagnetic (ie, non-magnetic steel), and iron-nickel alloys with a mass fraction of nickel greater than 30% are important precision soft magnetic materials.
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Alloys with a nickel content of more than 15% have high corrosion resistance to sulfuric acid and hydrochloric acid, but are not resistant to nitric acid corrosion.
03 Common nickel-based alloy material grades
Soft Magnetic Alloy Series
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Soft magnetic alloys are a class of alloys with high permeability and low coercivity in weak magnetic fields. This kind of alloy is widely used in the radio electronics industry, precision instrumentation, remote control and automatic control systems. It is mainly used for energy conversion and information processing.
1J50 （ Corrosion & fatigue nickel alloy – 1J50）
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1J50 is a nickel-iron soft magnetic alloy with high initial and maximum permeability, low coercivity and high saturation magnetic induction.
1J85
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1J85 is a nickel alloy with a nickel content of 79-81%. It has the highest initial permeability, maximum permeability and extremely low coercivity, and is sensitive to weak signals. 1J85 Saturation magnetic induction intensity greater than 0. 78T, initial permeability greater than 30mH/m, maximum permeability greater than 115mH/m, coercivity less than 2. 4A/m, suitable for DC relays, communications and electronic equipment transformers, chokes Core laminates in devices, magnetic shielding devices, parts or control elements.
Corrosion resistant alloy series
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Corrosion-resistant alloys are based on nickel-chromium, iron-nickel-chromium as the matrix, and alloy elements such as molybdenum, tungsten, copper, niobium, aluminum, and titanium are added. Gas turbine, energy, general industry, etc.
Monel 400
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The structure of Monel 400 alloy is a high-strength single-phase solid solution. It is a corrosion-resistant alloy with the largest dosage, the most widely used and excellent comprehensive properties. This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas medium, and also has excellent corrosion resistance in hot concentrated alkali solution. Mainly used in seamless water pipes, steam pipes, seawater exchangers and evaporators in power plants, sulfuric acid and hydrochloric acid environments, crude oil distillation, pump shafts and propellers of equipment used in seawater, and pumps and valves used in the production of hydrochloric acid equipment, etc. .
Monel K500
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Monel K500 (K500, NCu30-2-1, UNS N05500) alloy not only has excellent mechanical properties such as high strength, corrosion resistance and non-magnetic properties, but also has the same corrosion resistance as Monel 400. It can be used as a pump shaft material and is suitable for working under the harsh geological mining conditions of high-sulfur and high-wax oil layers.
High temperature alloy series
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Superalloy refers to a class of metal materials based on iron, nickel and cobalt, which can work for a long time at a high temperature above 600 ° C and under certain stress. It has excellent high temperature strength, good oxidation resistance and thermal corrosion resistance, good fatigue properties, fracture toughness and other comprehensive properties. It can keep the crystal structure stable and the solid solution does not change in the long-term high temperature environment, and is mainly used in the aerospace and energy fields.
GH4169 (Inconel 718)
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GH4169 is a precipitation hardening nickel-iron-chromium alloy with high high temperature strength and excellent creep properties. Mainly used in aerospace, gas turbine, nuclear power fields. It can be used to make important parts such as aero-engine turbine blades, guide vanes, turbine disks, combustion chamber flame tubes, and compressors.
K438 (In738LC)
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Nickel-based precipitation hardening type equiaxed crystal casting superalloy, which is characterized by low phosphorus content, small solidification segregation, and operating temperature below 900 °C. The alloy has good microstructure stability and casting process performance. The main products are gas turbine precision casting blades. It is used to make industrial gas turbine blades, marine aircraft and ship gas turbine parts that work for a long time below 900 °C.
