Compared with imported 316L, what is the corrosion resistance of domestic 2507 stainless steel?

?/x2crnimon25-7-4

International Identifiers.

astm a182 f53，a276，s32750，ss2328，saf 2507，ss2328

X2Crnimon25-7-4 Features and Uses:

It is a corrosion-resistant austenitic-ferritic (duplex) steel.

X2Crnimon25-7-4 Features:

Solderability: ??Good.

Machinability: ?3 (1 = Very Poor - 10 = Good) Corrosion Rating: ?4 (0 = weak - 5 = good) x2crnimon25-7-4 chemical composition:

Carbon C: Silicon Si:

Manganese mn:

Phosphorus p: sulfur s:

Chromium Cr:Molybdenum Mo:

Nickel Ni: Nitrogen N:

321 belongs to the American standard of titanium-containing austenitic stainless steel, and the executive standard: ASTM A276 A276M-17

The properties of 321 stainless steel are very similar to those of 304, but due to the addition of titanium metal, it has better resistance to grain boundary corrosion and high temperature strength. Due to the addition of titanium metal, the formation of chromium carbide is effectively controlled.

The chemical composition of 321 stainless steel is shown in the following figure:

321 Stainless Steel Industry Applications:

It is used in field and open-air machines in the chemical, coal, and petroleum industries with high requirements for grain boundary corrosion resistance, as well as heat-resistant parts for building materials and parts with difficulty in heat treatment.

1 .Petroleum exhaust gas combustion pipelines.

2 .Engine exhaust pipe.

3 .Boiler housings, heat exchangers, furnace components.

4 .Silencing parts for diesel engines.

5 .Boiler pressure vessels.

6 .Chemical transport trucks.

7 .Expansion joints.

8 .Spiral welded pipes for furnace pipes and dryers.

316L belongs to the American standard austenitic stainless steel, and 316L stainless steel implements the standard "ASTM A240 A240M-19".

316L stainless steel is a molybdenum-containing stainless steel grade, due to the molybdenum content in the steel, the total performance of this steel grade is better than that of 310 and 304 stainless steel, under high temperature conditions, when the concentration of sulfuric acid is lower than 15% or higher than 85%, 316L stainless steel has a wide range of uses. 316L stainless steel also has good resistance to chloride attack, so it is commonly used in marine environments. 316L stainless steel is commonly used in pulp and paper equipment, heat exchangers, dyeing equipment, film processing equipment, pipes, exterior materials for buildings in coastal areas, and bracelets and cases for high-end watches.

seawater equipment, chemicals, dyes, papermaking, oxalic acid, fertilizer and other production equipment; Photography, food industry, coastal facilities, ropes, CD rods, bolts, nuts.

The chemical composition of 316L stainless steel is shown below:

In terms of corrosion resistance, 321 stainless steel is of course stronger, because its ** and hardness are better. So of course it's 321. In terms of corrosion resistance, its hardness is better, so it is more corrosion-resistant.

316 stainless steel is molybdenum added, so it has good corrosion resistance and high temperature strength, while the carbon content is low compared to 316L. Normally, it has similar properties to 316 stainless steel, and also has superior resistance to grain boundary corrosion lCompared with l, the first two are molybdenum stainless steel, and the molybdenum content of 316L is higher than that of 316, so the corrosion resistance of 316 is better than that of 304 stainless steel.

In terms of corrosion resistance, 321 stainless steel and 316 stainless steel are definitely stronger.

Corrosion-resistant stainless steel of 321 and 2 stainless steel of 316, I think this should still be 2 of 316, stainless steel will be a little longer, and this corrosion resistance is also very good.

1: Grade 316Ti stainless steel.

Two: chemical composition.

c：≤ si≤ mn≤ p≤ s≤ ni crmo ti≥5*c%~

Three: the scope of application, the field of application:

316L stainless steel is added with MO, so its corrosion resistance, atmospheric corrosion resistance and high temperature strength are particularly good, and can be used under harsh conditions; Excellent work hardening (non-magnetic). Excellent strength at high temperatures. 316L stainless steel is an austenitic stainless steel and cannot be strengthened by heat treatment.

It has good strength, plasticity, toughness and cold formability, as well as good low-temperature properties. Due to the addition of 2% MO on the basis of Cr18Ni8, the steel is endowed with good resistance to reducing media and pitting resistance. It has suitable corrosion resistance in various organic acids, inorganic acids, alkalis, salts and seawater.

In reducing acidic media, its corrosion resistance is much better than that of 304

Four: Overview. The corrosion resistance of stainless steel is better than that of 304 stainless steel, and it has good corrosion resistance in the production process of pulp and paper.

And 316 stainless steel is also resistant to the erosion of the ocean and the aggressive industrial atmosphere. In intermittent use below 1600 degrees and continuous use below 1700 degrees, 316 stainless steel has good oxidation resistance. In the range of 800-1575 degrees, it is better not to act continuously on 316 stainless steel, but when 316 stainless steel is used continuously outside of this temperature range, the stainless steel has good heat resistance.

316L stainless steel has better resistance to carbide precipitation than 316 stainless steel, and can be used in the above temperature ranges. Annealing is carried out in the temperature range of 1850-2050 degrees, followed by rapid annealing, followed by rapid cooling. It has high temperature resistance, easy processing, and high strength.

316L stainless steel, no post-weld annealing is required.

316L has a wide range of applications in the chemical industry due to its excellent corrosion resistance, and 316L is also a derivative steel grade belonging to type 18-8 austenitic stainless steel, with the addition of 2 3% MO element. On the basis of 316L, many steel grades are also derived, such as 316Ti is derived after adding a small amount of Ti, 316N is derived after adding a small amount of N, and 317L is derived by increasing Ni and Mo content.

Most of the 316L available on the market is manufactured according to the American Standard. Due to cost considerations, steel mills generally try to lower the Ni content of products. The American standard stipulates that the Ni content of 316L is 10 14%, and the Japanese standard stipulates that the Ni content of 316L is 12 15%.

According to the minimum standard, there is a 2% difference between the American standard and the Japanese standard in Ni content, which is still quite huge when it comes to the first day, so customers still need to see clearly when purchasing 316L products, and whether the product refers to the ASTM or JIS standard.

The MO content of 316L makes this steel grade have excellent corrosion resistance and can be safely used in environments containing halogen ions such as Cl. Since 316L is mainly used in its chemical properties, steel mills have slightly lower requirements for surface inspection of 316L (compared to 304), and customers with higher surface requirements should strengthen surface inspection.

316L: Mo (2-3%) is added to steel, so the corrosion resistance and high temperature strength are excellent; SUS316L has a lower carbon content than SUS316, so the resistance to intergranular corrosion is better than that of SUS316. High creep strength at high temperatures. It can be used in harsh conditions, has good work hardenability, and is non-magnetic.

It is suitable for seawater equipment, chemicals, dyes, paper, oxalic acid, fertilizer production equipment, photography, food industry, and coastal facilities.

It is a super austenitic stainless steel that is more resistant to corrosion than 316L.

Product name: N08926

International common names: desulfurization and denitrification alloy, UNS N08926, CRONIFER1925HMO, Incoloy Alloy25-6MO, NAS 255NM

National standards: ASTM B625, ASTM A240, ASTM B673, ASTM B674, ASTM B677

Main components: carbon (C), manganese (Mn), nickel (Ni), silicon (Si), phosphorus (P), sulfur (S), chromium (Cr), copper (Cu), molybdenum (Mo), nitrogen (N).

Physical Properties: Density: , Melting Point: 1320-1400, Magnetism: None.

Heat treatment: between 980-1150 heat preservation for 1-2 hours, fast air cooling or water cooling.

Mechanical Properties: Tensile Strength: B 650MPa, Yield Strength B 295MPa: Elongation: δ 35%, Hardness; hrb90

Material Description: N08926) has very high resistance to pitting and crevice corrosion in halide media and sulfur-containing hydroacidic environment, can effectively resist chloride ion stress corrosion, and also has good corrosion resistance in oxidizing and reducing media, good stability, mechanical properties slightly better than 904L, can be used in the manufacture of pressure vessels from -196 to 400.

Typical working conditions: 60% sulfuric acid, below 80, annual corrosion rate <

Supporting welding materials and welding process: It is recommended to use AWS welding wire ERNICRMO-3 or AWS electrode ENICRMO-3 for alloy welding.

Applications: flue gas desulfurization unit, evaporator, heat exchanger, filter and mixer for phosphoric acid production, sulfuric acid conveying device, condenser, fire extinguishing system, seawater filtration system, hydraulic and recharge pipeline system in offshore industry, pulp drifting system, salt evaporative condenser, electric and radio pollution cooling water pipeline system, reverse osmosis seawater desalination device, corrosive chemical transportation and storage tank, halogen-catalyzed organic matter production equipment, etc.

It is desulfurization and denitrification hexamolybdenum steel, super austenitic stainless steel:

926 UNS N08926) has very high resistance to pitting and crevice corrosion in halogenated media and sulfur-containing hydroacidic environments, can effectively resist chloride ion stress corrosion, and also has good corrosion resistance in oxidizing and reducing media, good stability, mechanical properties slightly better than 904L, can be used in the manufacture of pressure vessels from -196 to 400.

Shanghai Boseman.

Heat treatment: between 980-1150 heat preservation for 1-2 hours, fast air cooling or water cooling.

Typical working conditions: 60% sulfuric acid, below 80, annual corrosion rate <

Supporting welding materials and welding processes: It is recommended to use AWS welding wire ERNICRMO-3 or AWS electrode ENICRMO-3 for alloy welding.

Applications: flue gas desulfurization unit, evaporator, heat exchanger, filter and mixer for phosphoric acid production, sulfuric acid conveying device, condenser, fire extinguishing system, seawater filtration system, hydraulic and recharge pipeline system in offshore industry, pulp drifting system, salt evaporative condenser, electric and radio pollution cooling water pipeline system, reverse osmosis seawater desalination device, corrosive chemical transportation and storage tank, halogen-catalyzed organic matter production equipment, etc.

The corrosion resistance is that of austenitic stainless steels with a similar chemical composition to alloy 904L, and its nitrogen content has been increased to about that, and the molybdenum content is about. The increased nitrogen and molybdenum content significantly improves the resistance to pitting and crevice corrosion in halide media. At the same time, nickel and nitrogen not only ensure the stability of the metallographic phase, but also reduce the tendency of intergranular phase precipitation during hot working or welding than alloys with lower nickel nitrogen content.

Excellent localized corrosion resistance combined with a 25% nickel content makes the alloy particularly resistant to corrosion in chloride media. Tests in various FGD systems of limestone slurry with chloride concentration of 10,000-70,000 ppm, pH value of 5-6 and operating temperature of 50-68 show that after a test period of 1-2 years, the alloy is basically free of pitting corrosion and crevice corrosion.

Alloys also have good corrosion resistance in other chemical media, as well as high-temperature, high-concentration media, including sulfuric acid, phosphoric acid, acid gas, seawater, salts and organic acids. The alloy is selected for Chapter 6 of the BAM catalogue "Specification for Dangerous Goods Storage and Transport Containers" of the German National Institute for Materials Research and Testing (BAM) in Berlin. In addition, the best corrosion resistance can only be achieved if the material is in the correct metallurgical state and under conditions that guarantee cleanliness.

Main specifications: seamless pipes, steel plates, round bars, forgings, flanges, rings, welded pipes, steel strips, straight bars, wires and supporting welding consumables, processed parts.

304L stainless steel :(L is low-carbon) as a low-carbon 304 steel, in the general state, its corrosion resistance is similar to 304 rigid, but after welding or stress relieving, its grain boundary corrosion resistance is excellent; In the case of no heat treatment, it can also maintain good corrosion resistance, and the operating temperature is -196 800. It is used in the chemical, coal, and petroleum industries with high requirements for grain boundary corrosion resistance, as well as heat-resistant parts for building materials and parts with difficulty in heat treatment.