There are several metal materials that can be considered for reference: 1.4529, 254SMO, AL-6XN, 904L, the specific choice combined with the use of working conditions.
1.4529 is desulfurization and denitrification six molybdenum steel, super austenitic stainless steel:
1.4529 (Incoloy?926/UNS?N08926) in the halide medium and sulfur-hydrogen-containing acidic environment with very high resistance to pitting corrosion and crevice corrosion, can effectively resist chloride stress corrosion. Resistance to chloride ion stress corrosion, in oxidizing and reducing media also has good corrosion resistance, good stability, mechanical properties slightly better than 904L, can be used for -196 to 400 ℃ pressure vessel manufacturing.
1.4529Heat treatment:
Holding temperature between 980-1150 ℃ for 1-2 hours, rapid air cooling or water cooling.
1.4529 Typical working conditions:
60% sulfuric acid, below 80 ℃, annual corrosion rate <0.1mm
1.4529 supporting welding materials and welding process:
1.4529 alloy welding recommendations Use AWS?A5.14 welding wire ERNiCrMo-3 or AWS?A5.11 welding rod ENiCrMo-3.
1.4529 application areas:
Flue gas desulphurization devices, evaporators, heat exchangers, filters, and mixers for the production of phosphoric acid, sulphuric acid conveying devices, condensers, fire suppression systems
1.4529 Corrosion Resistance:
1.4529 is an austenitic stainless steel with a similar chemical composition to alloy 904L, with an increased nitrogen content of about 0.2% and a molybdenum content of about 6.5%. 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 to precipitate intergranular phases during hot working or welding than alloys with a low nickel and nitrogen content. The excellent resistance to localized corrosion coupled with a nickel content of 25% gives alloy 1.4529 particularly outstanding corrosion resistance in chloride-ion media. Tests in a variety of FGD?systems with limestone slurry at chloride concentrations of 10,000-70,000 ppm, PH?values of 5-6, and operating temperatures of 50-68°C have shown that, after a test period of 1-2?years, alloy 1.4529?basically does not suffer from pitting and crevice corrosion.
Alloy 1.4529 also has excellent corrosion resistance in other chemical media, as well as high-temperature, high-concentration media, including sulfuric and phosphoric acids, acid gases, seawater, salts, and organic acids. 1.4529 alloy is the material of choice for the BAM Catalog, Chapter 6, "Specification of Vessels for the Storage and Transportation of Hazardous Goods," of the German National Institute for Materials Research and Testing (BAM) in Berlin. The alloy is the material of choice for the BAM catalog, Chapter 6? In addition, optimum corrosion resistance can only be achieved if the material is in the correct metallurgical condition and is clean.
1.4529 main specifications:
1.4529 seamless pipe, 1.4529 steel plate, 1.4529 round steel, 1.4529 forgings, 1.4529 flanges, 1.4529 rings, 1.4529 welded pipes, 1.4529 steel strips, 1.4529 straight bars, 1.4529 Wire and supporting welding consumables, 1.4529 round cake, 1.4529 flat steel, 1.4529 hexagonal bar, 1.4529 size head, 1.4529 elbow, 1.4529 tee, 1.4529 machined parts, 1.4529 bolts and nuts, 1.4529 fasteners
254SMO is a kind of austenitic stainless steel Hexa-molybdenum steel.
Because of its high molybdenum content, it has very high resistance to pitting and crevice corrosion. This grade of stainless steel was developed for use in halide-containing environments such as seawater. 254SMO also has good resistance to uniform corrosion. Especially in halide-containing acids, the steel is superior to ordinary stainless steel. Its C content <0.03%, so called pure austenitic stainless steel . (<0.01% also called super austenitic stainless steel). Super stainless steel is a kind of special stainless steel, first of all in the chemical composition is different from ordinary stainless steel, refers to high nickel, high chromium, high molybdenum, a kind of high alloy stainless steel. One of the more famous is 254SMo containing 6% Mo, this kind of steel has very good resistance to local corrosion, in seawater, inflatable, the existence of crevices, low-speed scouring conditions, there is good resistance to pitting corrosion (PI ≥ 40) and good resistance to stress corrosion, is a substitute for Ni-based alloys and titanium alloys. Secondly, in the performance of high temperature resistance or corrosion resistance, it has more excellent high temperature resistance or corrosion resistance, which is irreplaceable by 304 stainless steel. In addition, from the classification of stainless steel, special stainless steel metallurgical organization is a stable austenitic metallurgical organization.
Because this special stainless steel is a high alloy material, so in the manufacturing process is quite complex, generally people can only rely on traditional processes to manufacture this special stainless steel, such as infusion, forging, calendering and so on.
254SMO main components:
254SMo contains carbon (C) ≤ 0.02, manganese (Mn) ≤ 1.00, nickel (Ni) 17.5 ~ 18.5, silicon (Si) ≤ 0.8 phosphorus (P) ≤ 0.03, sulfur (S) ≤ 0.01, chromium (Cr) 19.5 ~ 20.5, copper (Cu), copper (Cu), copper (Cu), copper (Cu). (Cu) 0.5 ~ 1.0, molybdenum (Mo) 6.0 ~ 6.5
254SMO countries and standards:
UNS S31254, DIN/EN 1.4547, ASTM A240, ASME SA-240
254SMO physical properties:
254SMO physical properties:
254SMO physical properties:
254SMO physical properties: Three years of experience in the field of steel production. 254SMO Physical Properties:
Density: 8.24g/cm3, Melting Point: 1320-1390 ℃, Magnetism: None
254SMO Mechanical Properties:
Tensile Strength: σb ≥ 650Mpa, Yield Strength σb ≥ 310Mpa: Elongation: δ≥40%, Hardness: 182-223 (HB)
254SMO corrosion resistance:
It is a high corrosion-resistant super austenitic stainless steel, which is developed for the environment of halide and acid, and is widely used in high concentration of chlorine ions in the medium, seawater and other harsh working conditions. In the acidic medium of various industrial occasions, especially in the halide-containing acids, 254SMO is far superior to other stainless steels, and in some cases can be comparable to Hastelloy and titanium. Lower carbon content and high molybdenum content, so that it has good resistance to pitting corrosion and crevice corrosion resistance, excellent resistance to intergranular corrosion, is a cost-effective stainless steel, chemical industry at home and abroad, desulfurization and environmental protection are widely used.
254SMO supporting welding consumables:
ERNiCrMo-3 wire, ENiCrMo-3 electrode
254SMO main specifications:
254SMO Seamless Pipe, 254SMO Steel Plate, 254SMO round steel, 254SMO forgings, 254SMO flanges, 254SMO rings, 254SMO welded pipes, 254SMO steel strips, 254SMO straight bars, 254SMO wires and ancillary welding consumables, 254SMO round cakes, 254SMO flats, 254SMO hexagonal rods, 254SMO large and small heads, 254SMO elbows, 254SMO Tee, 254SMO machined parts, 254SMO bolts and nuts, 254SMO fasteners
AL-6XN hexamolybdenum super austenitic stainless steel?
AL-6XN Overview:
AL-6XN (N08367) super austenitic stainless steel is also a super austenitic stainless steel with excellent resistance to chloride ion pitting and crevice corrosion, as a corrosion-resistant alloy with a good cost-effective performance, and its overall corrosion resistance Relative to 316L has a great leap, while relative to other corrosion-resistant nickel-based alloys such as C-276 its corrosion resistance is close to the cost advantage is obvious. Because of the significant nitrogen component added to the alloy, thus making Al-6XN material relative to conventional austenitic stainless steel (such as 304, 316, 317, etc.) has a higher tensile strength, while maintaining excellent toughness and impact strength, ASME standards in the permissible stress value, Al-6XN relative to the 316L to be 40% higher, compared to copper-nickel alloy is higher by nearly double.
AL-6XN international name:
Al-6XN, desulfurization and denitrification alloy, UNS N08367, Cronifer1925hMo, Incoloy alloy25-6HN, NAS 254NM
AL-6XN Execution standard:
ASTM B688, ASTM A240, ASTM B676, ASTM B675, ASTM B564
AL-6XN Chemical Composition:
Carbon C:0.03
Magnesium Mg:2.0
Phosphorus P:0.04
Sulfur S:0.03
Silicon Si:1.0
Nickel Ni:23.5-25.5
Chromium Cr:20.0-22.0
Molybdenum Mo:6.0-7.0
Nitrogen N:0.18-0.25
Copper Cu. 0.75
AL-6XN Physical Properties:
Density: 8.24g/cm3
Melting Point: 1370-1398℃
Modulus of Elasticity: 290GPa
Thermal Conductivity: 90 W/(m?°C)?
Hardness (HB): 280
Thermal Expansion Coefficient ( 20-100℃): 8.5×10-6/℃
AL-6XN Mechanical Properties:
Tensile Strength: σb ≥ 650Mpa, Yield Strength σb ≥ 295Mpa: Elongation: δ ≥ 35%< /p>
AL-6XN heat treatment:
Holding temperature between 980-1150 ℃ for 1-2 hours, rapid air cooling or water cooling.
AL-6XN main characteristics:
AL-6XN (N08367,1.4501) stainless steel than the standard 300 series alloys, chloride ions have a higher resistance to pitting, crevice corrosion and pressure crevice corrosion, in the stainless steel Cr, Mo, Ni, C are different media have a Corrosion resistance. Cr is a representative of corrosion resistance in natural and oxidizing environments, the growth in the content of Cr, Mo, Ni increases the resistance to pitting corrosion, nickel provides an austenitic structure, nickel-molybdenum increases the pressure crevice corrosion resistance to chloride ions and corrosion resistance to reduced environments. High nickel (24%), molybdenum (6.3%) AL-6XN stainless steel has better resistance to pressure crevice corrosion. Molybdenum provides resistance to chloride pitting, nickel further enhances pitting resistance, and provides higher strength than 300 austenitic stainless steel, so it is often used in thinner sections of equipment. Higher levels of chromium, molybdenum, and nickel in AL-6XN stainless steel also provide corrosion resistance during forming and welding of the stainless steel.
Additionally, AL-6XN stainless steel has the following characteristics
1, excellent resistance to pitting corrosion in chloride-containing media, crevice corrosion resistance.
2, excellent resistance to stress corrosion in sodium chloride salt solution media.
3, high strength, good toughness.
AL-6XN main applications:
AL-6XN high chromium, molybdenum, nickel and nitrogen make AL-6XN has a good resistance to chloride pitting ability, crevice corrosion, which makes AL-6XN used in many environments:
AL-6XN main specifications:
AL-6XN seamless pipe, AL-6XN steel plate, AL-6XN round steel, AL-6XN forgings, AL-6XN flanges, AL-6XN rings, AL-6XN welded pipes, AL-6XN steel strips, AL-6XN straight bars, AL-6XN wires and supporting weldments, AL-6XN round cakes, AL-6XN flat steel, AL AL-6XN hexagonal bar, AL-6XN size head, AL-6XN elbow, tee, AL-6XN AL-6XN machined parts, AL-6XN bolts and nuts, AL-6XN fasteners
Overview of 904L Super Stainless Steel:
904L Super Austenitic Stainless Steel is a low carbon, high nickel and molybdenum stainless steel. Austenitic stainless acid-resistant steel, for the introduction of the French H-S company's proprietary materials. Has a very good activation-passivation transformation ability, excellent corrosion resistance, in non-oxidizing acids such as sulfuric acid, acetic acid, formic acid, phosphoric acid has good corrosion resistance, in neutral chloride-containing media with good resistance to pitting corrosion, and at the same time has a good resistance to crevice corrosion and resistance to stress corrosion performance. Applicable to various concentrations of sulfuric acid below 70 ℃, in the normal pressure resistance of any concentration, any temperature of acetic acid and formic acid and acetic acid mixed acid corrosion resistance is also very good. Super austenitic stainless steel 904L is a kind of austenitic stainless steel with low carbon content and high alloy, which has good corrosion resistance in dilute sulfuric acid, and is specially designed for environments with harsh corrosive conditions. Has a high chromium content and sufficient nickel content, the addition of copper makes it has a strong acid resistance, especially for chloride interstitial corrosion and stress corrosion chipping has a high degree of resistance, not easy to etch spots and cracks, pitting corrosion resistance is slightly better than other steels, has a good machinability and weldability, can be used for pressure vessels.
904L super stainless steel grades and standards:
00Cr20Ni25Mo4.5Cu (national standard), UNS N08904 (the American Society of Motor Vehicle Engineers and the American Society for Testing and Materials in 1967 *** with the design of the standard), DIN1.4539 (German standard), ASTM A240 (German standard).
904L Super Stainless Steel Metallurgical Structure:
904L Super Stainless Steel Metallurgical Structure:
904L Super Stainless Steel Metallurgical Structure:
904L Super Stainless Steel Metallurgical Structure:904L Super Stainless Steel Metallurgical Structure:?
904L is a completely austenitic organization, compared with the general austenitic stainless steel with high molybdenum content, 904L is insensitive to precipitation of ferrite and alpha phase.
904L Super Stainless Steel Processing Properties:
Welding Properties
As with stainless steels in general, 904L can be welded using a variety of welding methods. The most commonly used welding methods for manual arc welding or sui gas shielded welding, welding rod or wire metal based on the composition of the base material and higher purity, molybdenum content requirements than the base material. Preheating is generally not required before welding, but in cold outdoor work, in order to avoid the condensation of water vapor, joints or adjacent areas can be uniformly heated. Note that the local temperature should not exceed 10 0 ℃, so as not to lead to carbon agglomeration, causing intergranular corrosion. Welding is recommended to use a small line energy, continuous and fast welding rate. After welding generally do not need heat treatment, such as the need for heat treatment, must be heated to 110 0 ~ 1150 ℃ after rapid cooling.
Supporting welding materials and welding process: 904L welding selection of ER385 wire and E385 electrodes
Machining performance
904L machining characteristics are similar to other austenitic stainless steel, machining process, there is a tendency to stick knife and hardening of the process. Positive front angle carbide tools should be used, sulfurized and chlorinated oils as cutting coolant, equipment and processes should be used to reduce work hardening as a prerequisite. Slow cutting speeds and feeds should be avoided in the cutting process.
904L corrosion resistance and the main use of the environment:
904L is designed for corrosive conditions in harsh environments of a very low carbon content, high alloying austenitic stainless steel, better than the 316L and 317L with better corrosion resistance, while taking into account the price and performance, cost-effective. Due to the addition of 1.5% copper, it has excellent corrosion resistance to reducing acids such as sulfuric and phosphoric acids. It also has excellent corrosion resistance to stress corrosion, pitting and crevice corrosion caused by chloride ions, and good resistance to intergranular corrosion. In the 0-98% concentration range of pure sulfuric acid, 904L can be used up to 40 degrees Celsius. In 0-85% concentration range of pure phosphoric acid, its corrosion resistance is very good. In industrial phosphoric acid produced by the wet process, impurities have a strong influence on corrosion resistance. In all kinds of phosphoric acid, 904L corrosion resistance is superior to ordinary stainless steel. In strongly oxidizing nitric acid, 904L has lower corrosion resistance compared to highly alloyed steels without molybdenum. In hydrochloric acid, the use of 904L is limited to lower concentrations of 1-2%. In this concentration range, the corrosion resistance of 904L is better than that of conventional stainless steels. 904L steel has a high resistance to pitting corrosion. Its resistance to crevice corrosion in chloride solutions. The high nickel content of 904L reduces the rate of corrosion at pockmarks and crevices. Ordinary austenitic stainless steels can be sensitive to stress corrosion in a chloride-rich environment at temperatures above 60 degrees C. This sensitization can be reduced by increasing the nickel content of the stainless steel. Due to the high nickel content, 904L has high resistance to stress corrosion rupture in chloride solutions, concentrated hydroxide solutions and hydrogen sulfide rich environments.
904L application areas:
Petroleum, petrochemical equipment, such as petrochemical equipment in the reactor, etc., sulfuric acid storage and transportation equipment, such as heat exchangers, etc., power plant flue gas desulfurization devices, the main use of the parts are: absorption tower tower, flue, stall door panels, the inner parts of the shower system, etc., the organic acid treatment system of the Scrubbers and fans, seawater treatment devices, seawater heat exchangers, paper industry equipment, sulfuric acid, nitric acid equipment, acid production, the pharmaceutical industry and other chemical equipment, pressure vessels, food equipment, pharmaceutical factories: centrifuges, reactors, etc., plant food: soy sauce tanks, wine, salt tanks, equipment and dressings, strong corrosive medium of dilute sulfuric acid 904L is a matching steel.
904L main specifications:
904L seamless pipe, 904L steel plate, 904L round steel, 904L forgings, 904L flanges, 904L rings, 904L welded pipe, 904L steel strip, 904L straight bar, 904L wire and supporting welding consumables, 904L round cakes, 904L flat steel, 904L hexagonal bar, 904L size head, 904L elbow, 904L tee, 904L machined parts, 904L bolts and nuts, 904L fasteners
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