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Views: 2 Author: Site Editor Publish Time: 2024-12-10 Origin: Site
Alloy 31 has exceptional corrosion resistance to alkaline & halide-containing media, sulfuric acid, phosphoric acid, chlorine dioxide media, nitric acid as well as reducing & oxidizing medias. Alloy 31 is known as the "advanced 6 Mo-alloy" and is a version with higher chromium and nickel content, which can significantly improve the corrosion resistance in various media. It combines moderate tensile strength and high ductility with excellent corrosion resistance in sulfuric acid, reducing and oxidizing media and has strong resistance to corrosion and erosion corrosion in phosphoric environment. Technically qualified as a stainless steel, in reality, it covers the gap between high alloyed stainless steel and nickel alloys, performing some tasks as well as the latter while lowering the costs. It is widely used in offshore & marine industries, chemical & petrochemical processing, pharmaceutical piping, oil and gas extraction, and ore digestion plants. Especially, Alloy 31 can be used for the fabrication of pressure vessels which may endure a wide temperature-range from cryogenic level to elevated temperatures(-196°C to 550 °C). Alloy 31 is included in the list of the German Federal Institute for Materials Research and Testing for transport and storage containers for hazardous goods. It is approved by VdTÜV for pressure vessels from -196°C up to 550°C.
Alloy 31 is an iron-nickel-chromium-molybdenum alloy with relatively low cost and high corrosion resistance. Nitrogen and copper are added to this alloy element, and its performance is between special alloy austenitic stainless steel and existing nickel-based alloys. Alloy 31 has excellent general corrosion resistance to alkaline and halide-containing media, sulfuric acid, phosphoric acid, chlorine dioxide media, nitric acid, and reducing and oxidizing media. Typically the alloy has PREN of ≥ 48, It also has excellent resistance to intergranular corrosion, pitting corrosion, and crevice resistance. Corrosion and stress corrosion resistance and other local corrosion performance. This alloy has good cold and hot workability, formability, welding performance, high strength, and good plasticity. It is one of the iron-nickel-based corrosion-resistant alloys with the best overall performance.
(1) Excellent corrosion resistance in alkaline and acid halide media
(2) Wide operating temperature
(3) Excellent resistance to chlorine dioxide media
(4) Good resistance to stress corrosion cracking
(5) Excellent workability, weldability, and good thermal stability
(6) It has good corrosion resistance in phosphoric acid, boiling nitric acid, and sulfuric acid of any concentration
The Chemical Composition of Alloy 31, % | |
Nickel | 30.0-32.0 |
Chromium | 26.0-28.0 |
Iron | Balance |
Sulfur | ≤0.010 |
Si | ≤0.30 |
Manganese | ≤2.00 |
Phosphorus | ≤0.020 |
molybdenum | 6.0-7.0 |
Copper | 1.0-1.4 |
Nitrogen | 0.15-0.25 |
Carbon | ≤0.015 |
Different kinds of alloy 31 can be used to make a huge number of different things. There are Alloy 31 steel pipes and tubes, alloy 31 plates, sheets, and coils, alloy steel bars, rods, and wires, UNS N08031 forged fittings, alloy steel buttweld fittings, alloy steel flanges, fasteners, and more. Alloy steels are used in many different industries, like cars, mining, machinery and equipment, railroads, road building, buildings, appliances, and even off-shore applications.
In the building and construction industry, steel skeletons made of Alloy 31 are used for very large modern structures like airports, bridges, skyscrapers, and stadiums. Alloy steels have the high strength needed to hold up such big buildings. Even structures made of concrete use alloy steels as reinforcements to make the structures stronger and lighter. Alloy steel is also used to make small things like screws, nails, and bolts.
Alloy 31, which are a type of alloy steel, are used to make bridges. Because nickel, copper, and chromium are used as alloying elements, these offer better protection against corrosion. Alloy 31 are also used on the outside of buildings to make them look better. Weathering steel has a lot of benefits, such as high safety, easy and quick construction, good looks, shallow depth, low maintenance, and the ability to be changed in the future. Due to the way it naturally ages, it doesn't need to be painted, so it doesn't cause environmental problems like paint does. In the long run, weathering steels saves a lot of money.
Alloy 31 are used to make plates and strips, which are flat items. There are many different grades and sizes of plates. By welding Alloy 31 plates together, these are made into sections that are used in building.
Alloy 31 Strip can be rolled hot or cold, and they can also be galvanized by being dipped in hot water. Hot-dipped galvanized coils are used to make building materials like wall and roof claddings, side rails, roof purlins, light steel frames, and lintels.
Alloy 31 used in pipes made of stainless steel. These flanges can be made in different ways to fit different needs. Some of them are weld neck flanges, which have the same thickness and bevel as the pipe and can work well in harsh conditions like high pressure, high temperature, or temperatures below zero. Lap joint flanges are slip-on flanges that can be used with alloy steel pipes that need to be checked and maintained regularly.
Alloy 31 pipes are an important part of the building and construction industry because they are flexible, easy to fix without heat treatment, and last a long time. They are made of a mix of nickel, chromium, and stainless steel. Large-diameter welded pipes, electric fusion welded pipes, welded pipes, and seamless pipes are some of the special kinds of alloy steel pipes. In addition to high-pressure situations, they are also very useful in high-temperature or corrosive situations.
