Which is more acid-resistant, Hastelloy or 316L stainless steel?
Hastelloy is corrosion-resistant, but of course the price is much higher than 316L, so the working conditions and cost must be considered.
Hastelloy grades: Hastelloy C276, Hastelloy C22, Hastelloy C-2000, Hastelloy C-4, Hastelloy C, Hastelloy B, Hastelloy B-2, Hastelloy B-3, Hastelloy X, Hastelloy G-30, Hastelloy G-35, etc. .
Here are some general references:
The most commonly used Hastelloy C-276 Hastelloy, a nickel-chromium-molybdenum alloy, is resistant to high temperatures and corrosion.
Overview of Hastelloy C-276 characteristics and application areas:
This alloy has excellent corrosion resistance to most corrosive media in both oxidized and reduced states. Excellent resistance to pitting corrosion, crevice corrosion and stress corrosion cracking. The alloy is suitable for use in a variety of chemical process industries containing oxidizing and reducing media. The higher molybdenum and chromium content makes the alloy resistant to chloride ion erosion, and the tungsten element further improves its corrosion resistance. Hastelloy C-276 is one of the only materials resistant to corrosion by wet chlorine, hypochlorite and chlorine dioxide solutions. The alloy has significant corrosion resistance to high concentrations of chloride salt solutions (such as chlorine iron and copper chloride).
Hastelloy C-276 similar brands:
W.Nr.2.4819 NiMo16Cr15W (Germany) NC17D (France)
Hastelloy C-276 metallographic structure:
The alloy has a face-centered cubic lattice structure.
Hastelloy C-276 process performance and requirements:
1. The lower the sulfur content in thermal processing fuel, the better. The sulfur content in natural gas should be less than 0.1%, and the sulfur content in heavy oil should be less than 0.5%.
2. The thermal processing temperature range of the alloy is 1200℃~950℃, and the cooling method is water cooling or rapid air cooling.
3. Suitable for any traditional welding process, such as tungsten electrode inert gas shielded welding, plasma arc welding, manual sub-arc welding, metal pole inert gas shielded welding, and melting pole inert gas shielded welding.
Hastelloy C-276 main specifications:
Hastelloy C-276 seamless pipe, Hastelloy C-276 steel plate, Hastelloy C-276 round steel, Hastelloy C-276 forgings, Hastelloy C-276 flange, Hastelloy C-276 ring, Hastelloy C-276 welded pipe, Hastelloy C- 276 steel strip, Hastelloy C-276 straight bar, Hastelloy C-276 wire and supporting welding materials, Hastelloy C-276 processed parts, etc.
HASTELLOY C-22 is a Hastelloy series material, a nickel-based alloy, resistant to high temperatures and corrosion.
Hastelloy C-22 grade:
Hastelloy, C-22, INCONEL Alloy C-22, HC-22, Hastelloy C-22, UNS N06022, W.-Nr. 2.4602, ATI C-22, Nicrofer 5621 hMoW-Alloy C-22, NAS NW22, NS338,inconel622
Hastelloy C-22 execution standards:
ASTM B575/ASME SB-575, ASTM B574/ASME SB-574, ASTM B622/ASME SB-622, ASTM B619/ASME SB-619, ASTM B366/ASME SB-366, ASTM B564/ASME SB-564
Hastelloy C-22 heat treatment:
Keep the temperature between 1150-1175℃ for 1-2 hours, and quickly air-cool or water-cool.
Features of Hastelloy C-22:
Hastelloy C-22 alloy is a QUAN nickel-chromium-molybdenum-tungsten alloy that has better overall corrosion resistance than other existing nickel-chromium-molybdenum alloys, including Hastelloy C-276, C4 alloy and 625 alloy. Hastelloy C-22 alloy has good resistance to pitting corrosion, crevice corrosion and stress corrosion cracking. It has excellent resistance to oxidation in aqueous media, including wet chlorine, nitric acid or a mixture of oxidizing acids containing chloride ions. At the same time, Hastelloy C-22 alloy also has the ideal ability to resist the reducing and oxidizing environments encountered during the process. Relying on the performance of this WAN, it can be used in some troublesome environments or in factories for multiple production purposes. Hastelloy C-22 alloy has exceptional resistance to various chemical environments, including strongly oxidizing substances, such as ferric chloride, copper chloride, chlorine, thermal pollution solutions (organic and inorganic), formic acid, acetic acid, acetic anhydride, Sea water and salt solutions, etc. Hastelloy C-22 alloy has the ability to resist the formation of grain boundary precipitation in the welding heat affected zone, which makes it suitable for many chemical process applications in the welding state.
Metallographic structure of Hastelloy C-22:
Hastelloy C-22 has a face-centered cubic lattice structure.
Corrosion resistance of Hastelloy C-22:
Hastelloy C-22 alloy is suitable for use in various chemical process industries containing oxidizing and reducing media. The higher molybdenum and chromium content makes the alloy resistant to chloride ion erosion, and the tungsten element further improves its corrosion resistance. Hastelloy C-22 is one of the only materials that is resistant to corrosion by wet chlorine, hypochlorite and chlorine dioxide solutions. The alloy has significant corrosion resistance to high concentrations of chloride salt solutions (such as chlorine iron and copper chloride).
Hastelloy C-22 Application Scope Application areas include:
Hastelloy C-22 alloy has been widely used in the chemical and petrochemical fields, such as in components and catalytic systems that come into contact with chloride-containing organic matter. This material is especially suitable for use in high temperature, inorganic and organic acids mixed with impurities (such as formic acid and acetic acid), and seawater corrosion environments.
Application fields include: power plant desulfurization and denitrification environmental protection, petrochemical equipment, coal chemical industry, fluorine chemical industry, fine chemicals, PTA, aviation manufacturing, offshore platforms, seawater desalination, papermaking machinery, pharmaceutical equipment, heat exchange equipment, electrochemistry, metallurgy, nuclear energy, Chlor-alkali, shipbuilding, cement manufacturing, composite panels, acetic anhydride, salt production and plate heat exchangers, bellows expansion joints and other industries and products.
Hastelloy C-22 Other areas of application:
1. Acetic acid/acetic anhydride
2.Acid leaching
3. Cellophane manufacturing
4.Chlorination system
5. Complex mixed acids
6.Rollers for electroplating galvanizing tank
7.Expansion bellows
8. Flue gas cleaner system
9. Geothermal wells
10. Hydrogen fluoride furnace cleaner
11. Incineration cleaner system
12. Nuclear fuel regeneration
13.Pesticide production
14. Phosphoric acid production
15. Pickling system
16. Plate heat exchanger
17. Selective filtration system
18. Sulfur dioxide cooling tower
19.Sulfonation system
20. Tubular heat exchanger
21. Surfacing valve
Hastelloy C-22 main specifications:
Hastelloy C-22 seamless pipe, Hastelloy C-22 steel plate, Hastelloy C-22 round bar, Hastelloy C-22 forgings, Hastelloy C-22 flange, Hastelloy C-22 ring, Hastelloy C-22 welded pipe, Hastelloy C- 22 steel strip, Hastelloy C-22 straight bar, Hastelloy C-22 wire and supporting welding materials, Hastelloy C-22 round cake, Hastelloy C-22 flat steel, Hastelloy C-22 hexagonal rod, Hastelloy C-22 small and large ends, Hastelloy C-22 Elbows, Hastelloy C-22 Tees, Hastelloy C-22 Machined Parts, Hastelloy C-22 Bolts and Nuts, Hastelloy C-22 Fasteners and more.
Hastelloy C-2000/ N06200
Corresponding grade: W.NR 2.4675 UNS N06200 AWS 055 NS345 00Cr20Mo16
Applicable standards: ASTM B619 ASTM B574
The development of Hastelloy C-2000 expands the application range of a single alloy. Hastelloy C-2000, an alloy that adds copper to a nickel-chromium-molybdenum system, is resistant to a range of corrosive chemicals, including sulfuric acid, hydrochloric acid and hydrofluoric acid. The combination of molybdenum and copper provides excellent corrosion resistance to reducing media, with the higher chromium content giving it good oxidation resistance.
Application areas include: Chemical processing
Hastelloy C-2000 main specifications:
Hastelloy C-2000 seamless pipe, Hastelloy C-2000 steel plate, Hastelloy C-2000 round steel, Hastelloy C-2000 forgings, Hastelloy C-2000 flange, Hastelloy C-2000 ring, Hastelloy C-2000 welded pipe, Hastelloy C- 2000 steel strip, Hastelloy C-2000 straight bar, Hastelloy C-2000 wire and matching welding materials, Hastelloy C-2000 round cake, Hastelloy C-2000 flat steel, Hastelloy C-2000 hexagonal rod, Hastelloy C-2000 small and large heads, Hastelloy C-2000 elbow, Hastelloy C-2000 tee, Hastelloy C-2000 machined parts, Hastelloy C-2000 bolts and nuts, Hastelloy C-2000 fasteners
Hastelloy B-2 (UNS N10665), nickel-molybdenum alloy
Overview of Hastelloy B-2 characteristics and application fields:
Nickel-molybdenum alloy Hastelloy B-2 has extremely low carbon and silicon content, which reduces the precipitation of carbon and other impurity phases in the welding heat-affected zone, so its welds also have sufficient corrosion resistance. Hastelloy B-2 has good corrosion resistance in reducing media, such as hydrochloric acid solutions of various temperatures and concentrations. It also has good corrosion resistance in moderately concentrated sulfuric acid solutions (or containing a certain amount of chloride ions). It can also be used in acetic acid and phosphoric acid environments. Alloy materials can have the best corrosion resistance only when they are in a suitable metallographic state and pure crystal structure. It has a wide range of applications in the fields of chemistry, petrochemicals, energy manufacturing and pollution control, especially in sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid and other industries.
Hastelloy B-2 similar grades:
NS322 (China), NiMo28 (France), W.Nr.2.4617 (Germany), 00Ni70Mo28, N10665
Hastelloy B-2 metallographic structure:
Hastelloy B-2 has a face-centered cubic lattice structure. By controlling the iron and chromium content to a minimum, the processing brittleness is reduced and the precipitation of the Ni4Mo phase between 700-870°C is prevented.
Hastelloy B-2 process performance and requirements:
1. Heating should be done as quickly as possible to the required temperature. Thermal processing temperature range is 1160℃～900℃.
2. The average grain size of the alloy is closely related to the deformation degree and final forging temperature of the forging.
3. The adhesion of oxides, oxidation color and welding slag around the weld on the alloy surface is stronger than that of stainless steel. It is recommended to use a fine-grained abrasive belt or fine-grained grinding wheel for grinding.
4. The alloy should be machined after annealing. Due to the high work hardening rate of the material, it is advisable to use a lower cutting speed and heavy feed than when processing low-alloy standard austenitic stainless steel to cut into the cold work-hardened surface layer. under.
Hastelloy B-2 main specifications:
Hastelloy B-2 seamless pipe, Hastelloy B-2 steel plate, Hastelloy B-2 round steel, Hastelloy B-2 forgings, Hastelloy B-2 flange, Hastelloy B-2 ring, Hastelloy B-2 welded pipe, Hastelloy B- 2 Steel strips, Hastelloy B-2 straight bars, Hastelloy B-2 wires and supporting welding materials, Hastelloy B-2 round cakes, Hastelloy B-2 flat bars, Hastelloy B-2 hexagonal bars, Hastelloy B-2 large and small heads, Hastelloy B-2 elbows, Hastelloy B-2 tees, Hastelloy B-2 machined parts, Hastelloy B-2 bolts and nuts, Hastelloy B-2 fasteners, and more.
Hastelloy B-3 Nickel Molybdenum Alloy Overview:
1.B-3 alloy is a new member of the nickel-molybdenum alloy family. It has excellent corrosion resistance to hydrochloric acid at any temperature and concentration. At the same time, it also has good corrosion resistance to sulfuric acid, acetic acid, formic acid, phosphoric acid and other non-oxidizing media.
2. Due to the adjustment of its chemical composition, its thermal stability has been greatly improved compared to the original B-2 alloy. B-3 alloy has high resistance to pitting corrosion, stress corrosion, knife edge corrosion and corrosion in the heat affected zone of welding.
Corresponding brand:
Hastelloy B-3, UNS N10675, W.Nr.2.4600, NS3203
Metallographic structure of Hastelloy B-3
Hastelloy B-3 has a face-centered cubic lattice structure. The iron and chromium content of the alloy is controlled to a minimum, thus preventing the Ni4Mo phase from precipitating between 700-800°C, thereby reducing the risk of processing embrittlement.
Features of Hastelloy B-3
It can still maintain excellent plasticity when exposed to moderate temperatures; excellent resistance to pitting corrosion and stress corrosion cracking; excellent resistance to knife edge corrosion and heat affected zone corrosion; excellent resistance to acetic acid, acetic acid, phosphoric acid and other non-oxidizing agents. Acid resistance; Excellent resistance to hydrochloric acid corrosion at various concentrations and temperatures;
The application areas of Hastelloy B-3 include:
B-3 alloy can be used in all previous uses of B-2 alloy. Like B-2 alloy, B-3 is not recommended for use in environments where ferric iron salts and divalent copper salts exist, because these salts will Will quickly cause corrosion damage. When hydrochloric acid comes into contact with iron and copper, it reacts chemically to form ferric iron salts and divalent copper salts.
Hastelloy B-3 main specifications:
Hastelloy B-3 seamless pipe, Hastelloy B-3 steel plate, Hastelloy B-3 round steel, Hastelloy B-3 forgings, Hastelloy B-3 flange, Hastelloy B-3 ring, Hastelloy B-3 welded pipe, Hastelloy B- 3 steel strips, Hastelloy B-3 straight bars, Hastelloy B-3 wires and supporting welding materials, Hastelloy B-3 round cakes, Hastelloy B-3 flat bars, Hastelloy B-3 hexagonal bars, Hastelloy B-3 large and small heads, Hastelloy B-3 elbow, Hastelloy B-3 tee, Hastelloy B-3 machined parts, Hastelloy B-3 bolts and nuts, Hastelloy B-3 fasteners, etc.
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