904L stainless steel wire mesh types and characteristics introduction

904L stainless steel wire mesh types and characteristics introduction - Anping County Maoqun Wire Mesh Manufacturing Co., Ltd.
904L stainless steel wire mesh is also known as 904L stainless steel screen, 904L stainless steel woven mesh, 904L stainless steel filter, 904L square hole screen, 904L crimping mesh, 904L stainless steel mesh.
904L super austenitic stainless steel is a low-carbon, high-nickel, molybdenum austenitic stainless acid-resistant steel, which is a proprietary material introduced from the French H.S company. It has good activation-passivation transformation ability and excellent corrosion resistance. It has good corrosion resistance in non-oxidizing acids such as sulfuric acid, acetic acid, formic acid, and phosphoric acid. It has good pitting resistance in neutral chloride ion media, and has good resistance to crevice corrosion and stress corrosion. It is suitable for various concentrations of sulfuric acid below 70°C, and has good corrosion resistance in acetic acid of any concentration and any temperature under normal pressure and mixed acid of formic acid and acetic acid.
Super austenitic stainless steel 904L (00Cr20Ni25Mo4.5Cu; UNS: N08904; EN: 1.4539) is a high-alloy austenitic stainless steel with low carbon content. It has good corrosion resistance in dilute sulfuric acid and is designed for harsh corrosive environments. It has a high chromium content and sufficient nickel content. The addition of copper makes it very acid-resistant, especially highly resistant to chloride crevice corrosion and stress corrosion cracking. It is not easy to have pitting and cracks. Its pitting resistance is slightly better than other steel grades. It has good machinability and weldability and can be used for pressure vessels.
Brands and standards:
UNS N08904 (a standard jointly designed by the American Society of Automotive Engineers and the American Society for Testing and Materials in 1967), DIN1.4539 (German standard), ASTM A240 (American Society for Testing and Materials standard; the new standard classifies it as a stainless steel series, and the original standard ASME SB-625 classifies it as a nickel-based alloy series), SUS890L.
Metallographic structure of 904L stainless steel:
904L is a completely austenitic structure. Compared with austenitic stainless steel with a high molybdenum content, 904L is not sensitive to the precipitation of ferrite and α phase.
Physical and mechanical properties:
Density: 8.0g/cm3. Tensile strength: σb≥520Mpa. Elongation: δ≥35%. Corrosion resistance of 904L stainless steel:
Since the carbon content of 904L is very low (maximum 0.020%), no carbide will precipitate under general heat treatment and welding. This eliminates the risk of intergranular corrosion after general heat treatment and welding. Due to the high chromium, nickel, and molybdenum content and the addition of copper, 904L can be passivated even in a reducing environment such as sulfuric acid and formic acid. The high nickel content also has a lower corrosion rate in the active state. In pure sulfuric acid in the concentration range of 0~98%, the operating temperature of 904L can be as high as 40 degrees Celsius. In pure phosphoric acid in the concentration range of 0~85%, its corrosion resistance is very good. In industrial phosphoric acid produced by wet process, impurities have a strong influence on corrosion resistance. Among all kinds of phosphoric acid, 904L has better corrosion resistance than ordinary stainless steel. In highly oxidizing nitric acid, 904L has lower corrosion resistance than high alloyed steels without molybdenum. In hydrochloric acid, the use of 904L is limited to lower concentrations of 1-2%. In this concentration range. 904L has better corrosion resistance than conventional stainless steel. 904L steel has high resistance to pitting corrosion. Its resistance to crevice corrosion in chloride solutions is also very good. The high nickel content of 904L reduces the corrosion rate in pits and crevices. Ordinary austenitic stainless steels may be sensitive to stress corrosion in a chloride-rich environment at temperatures above 60 degrees Celsius. 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 cracking in chloride solutions, concentrated hydroxide solutions and hydrogen sulfide-rich environments.
904L is a highly alloyed austenitic stainless steel with a very low carbon content. The steel is designed for harsh corrosive environments. Initially, the alloy was developed to resist corrosion in dilute sulfuric acid. This property has been proven to be very successful in many practical applications.
Like other commonly used CrNi austenitic alloy steels, 904L alloy has good resistance to pitting and crevice corrosion, high resistance to stress corrosion cracking, good resistance to intergranular corrosion, good machinability and weldability. 904L alloy
is a versatile material that can be used in many industrial fields:
1. Petroleum and petrochemical equipment, such as reactors in petrochemical equipment.
2. Sulfuric acid storage and transportation equipment, such as heat exchangers.
3. Flue gas desulfurization equipment in power plants, the main use parts are: tower body, flue, baffle plate, internal parts, spray system, etc. of the adsorption tower.
4. Scrubbers and fans in organic acid treatment systems.


254SMO alloy wire mesh is also known as 254SMO alloy screen, 254SMO alloy filter, 254SMO alloy woven mesh, 254SMO filter, 254SMO alloy square hole mesh, etc.
254SMO is an austenitic stainless steel. Due to its high molybdenum content, it has extremely high resistance to pitting corrosion and crevice corrosion. This grade of stainless steel is developed and researched for use in environments containing halides such as seawater.
254SMO Chemical composition
C 0.05-0.10
Mn≤0.80
P≤0.040
S≤0.030
Si 1.40-2.00
Cr 20.00-22.00
Ni 10.00-12.00
Mo --
N 0.14-0.20
Ce:0.03-0.08
254SMO also has good uniform corrosion resistance. Especially in halide-containing acids, this steel is better than ordinary stainless steel. Its C content is <0.03%, so it is called pure austenitic stainless steel (<0.01% is also called super austenitic stainless steel). Super stainless steel is a special stainless steel. First of all, it is different from ordinary stainless steel in chemical composition. It refers to a high-alloy stainless steel containing high nickel, high chromium and high molybdenum. Among them, the more famous is 254SMo containing 6% Mo. This type of steel has very good local corrosion resistance. Under seawater, aeration, gaps, and low-speed scouring conditions, it has good pitting resistance (PI≥40) and good stress corrosion resistance. It is a substitute material for Ni-based alloys and titanium alloys. Secondly, in terms of high temperature resistance or corrosion resistance, it has better high temperature resistance or corrosion resistance, which is irreplaceable by 304 stainless steel. In addition, from the classification of stainless steel, the metallographic structure of special stainless steel is a stable austenitic metallographic structure.
High temperature resistance:
1. A large number of field experiments and extensive use experience show that even at slightly higher temperatures, 254SMO has a high resistance to crevice corrosion in seawater, which is only a few types of stainless steel.
2. The corrosion resistance of 254SMO in acidic solutions and oxidizing halide solutions such as those required for paper bleaching production is comparable to that of the most corrosion-resistant nickel-based alloys and titanium alloys.
3. Due to its high nitrogen content, 254SMO has higher mechanical strength than other types of austenitic stainless steel. In addition, 254SMO also has high ductility and impact strength and good weldability.
4. The high molybdenum content of 254SMO can make it have a higher oxidation rate during annealing, so that it has a rougher surface than ordinary stainless steel after pickling. But this has no adverse effect on the corrosion resistance of the steel.
Since this special stainless steel is a high-alloy material, the manufacturing process is quite complicated. Generally, people can only rely on traditional processes to manufacture this special stainless steel, such as pouring, forging, rolling, etc.
Main ingredients: 254SMo containing 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) 0.5 ~ 1.0, molybdenum (Mo) 6.0 ~ 6.5
National standards: UNS S31254, DIN/EN 1.4547, ASTM A280, ASME SA-240
Application areas:
1. Marine: marine structures in marine environment, seawater desalination, seawater aquaculture, seawater heat exchange, etc.
2. Environmental protection field: flue gas desulfurization equipment for thermal power generation, wastewater treatment, etc.
3. Energy field: atomic power generation, comprehensive utilization of coal, tidal power generation, etc.
4. Petrochemical field: oil refining, chemical and chemical equipment, etc.
5. Food field: salt making, soy sauce brewing, etc.
6. High concentration of chloride ion environment: paper industry, various bleaching devices.


Nickel alloy wire mesh is also known as rare metal mesh. Types: titanium wire mesh, molybdenum wire mesh, tungsten wire mesh, nickel wire mesh, gold wire mesh, silver wire mesh, niobium wire mesh, etc.
Alloy: Monel alloy mesh, Hastelloy mesh, Inconel alloy mesh, iron chromium aluminum wire mesh and nickel chromium alloy wire mesh, etc.
Widely used are:
iron chromium aluminum OCr25A15, 0Cr27Al7Mo2; nickel chromium alloy Cr15Ni60, Cr20Ni80, Cr20Ni35, Cr20Ni30;
stainless steel 310S, 321, 316; duplex stainless steel 2205, 904L; Hastelloy C-276, B-2; Monel 400, 500; Inconel 600,
601, 625, 800, 825; foam nickel, etc.
Its product features are: high temperature resistance, acid and alkali resistance, corrosion resistance, high resistivity, small resistance temperature coefficient, strong processing ability, good elasticity, etc. It is widely used in petroleum, chemical, rubber, automobile industry, screening particles, filtering gas, liquid, etc. Rare light metals: including lithium, rubidium, cesium, beryllium. Small specific gravity and strong chemical activity. Rare refractory metals: including titanium, zirconium, hafnium, vanadium, niobium, tantalum, molybdenum, tungsten. The melting point is high, and the melting point of the compounds generated with carbon, nitrogen, silicon, boron, etc. is also high.
Rare dispersed metals: referred to as scattered metals, including gallium, indium, thallium, germanium, rhenium, selenium, and tellurium. Most of them are found in minerals of other elements. 
Rare metals: Rare rare earth metals: referred to as rare earth metals, including scandium, yttrium and lanthanide elements. Their chemical properties are very similar and they coexist in minerals. Rare radioactive metals: including naturally occurring francium, radium, polonium and actinium, thorium, protactinium, uranium in the actinide metals, as well as artificially produced technetium, promethium, other actinide elements and radioactive metals 104 to 107.

Introduction to the types and characteristics of nickel-based high-temperature alloys at home and abroad Nickel-based
high-temperature alloys
1. Chinese brands: solid solution strengthened nickel- based high-temperature alloys
GH3007 (GH5K); GH3030 (GH30); GH3039 (GH39); GH3044 (GH44); GH3128 (GH128);
GH3170 (GH170); GH3536 (GH536); GH3600 (GH600); GH3625 (GH625); GH3652 (GH652);

2. Chinese brands: aging strengthened nickel-based high-temperature alloys
GH4033 (GH33); GH4037 (GH37); GH4049 (GH49); GH4080A (GH80A); GH4090 (GH90);
GH4093 (GH93); GH4098 (GH98); GH4099 (GH99); GH4105 (GH105); GH4133 (GH33A);
GH4133B; GH4141 (GH141); GH4145 (GH145); GH4163 (GH163); GH4169 (GH169); GH4199 (GH199)
; GH4202 (GH202); GH4220 (GH220); GH4413 (GH413); GH4500 (GH500);
GH4586 (GH586); GH4648 (GH648); GH4698 (GH698); GH4708 (GH708); GH4710 (GH710);
GH4738 (GH738; GH684); GH4742 (GH742);

3. American brand: solid solution strengthened nickel-based high temperature alloy
Haynes 214; Haynes 230; Inconel 600; Inconel 601; Inconel 602CA; Inconel 617; Inconel 625;RA333;Hastelloy B; Hastelloy N; Hastelloy S; Hastelloy W; Hastelloy X; Hastelloy C-276; Haynes HR-120; Haynes HR-160; Nimonic 75; Nimonic 86;

4. American brand: precipitation hardening nickel-based high-temperature alloy
Astroloy; Custom Age 625PLUS; Haynes 242; Haynes 263; Haynes R-41; Inconel 100;
Inconel 102; Incoloy 901; Inconel 702; Inconel 706; Inconel 718; Inconel 721; Inconel 722; Inconel 725; Inconel 751; Inconel X-750; M-252; Nimonic 80A;
Nimonic 90; Nimonic 95; Nimonic 100; Nimonic 105; Nimonic 115; C-263; Pyromet 860; Pyromet 31; Refractaloy 26; Rene, 41; Rene, 95; Rene, 100; Udimet 500; Udimet 520; Udimet 630; Udimet 700; Udimet 710; Unitemp af2-1DA; Waspaloy;

Hastelloy C276, Monel 400 and other corrosion resistant alloy
models: C276, B2, Monel 400, Ni, 600
Corrosion resistant alloy series · Commonly used corrosion resistant alloy series materials

Chinese brand foreign brand characteristics and uses
NS312 Inconel 600 resistant to high temperature oxide medium corrosion, used in heat treatment and chemical processing industrial equipment
NS112 Inconel 800H is resistant to corrosion by oxide media, has high resistance to high temperature and carburization, and is used for heating tubes, furnace tubes and components in synthetic fiber engineering.
NS322Hastelloy B-2 (Hastelloy B2) is resistant to corrosion by strong reducing media, improves resistance to intergranular corrosion, and is used in high-temperature hydrochloric acid and medium-concentration sulfuric acid environments.
NS334Hastelloy C276 (Hastelloy C276) is resistant to corrosion by oxidizing chloride aqueous solutions and wet chlorine and hypochlorous acid, and is used in highly corrosive oxidation-reduction composite media environments.
00Cr20Ni26Mo4.5Cu1.5904L is highly resistant to chloride crevice corrosion and stress corrosion cracking, and has slightly better resistance to pitting corrosion. It is widely used in pulp and papermaking industries and chemical industries.
Pure nickel NICKEL200/201 is mainly used in the alkali industry as a material for steam pipes and alkali pumps.
00Cr21Ni24Mo6.5NAL-6XN high-molybdenum super-austenitic stainless steel, a cost-effective alloy that resists chloride ion and stress corrosion
NiCu28-2.5-1.5Monel 400 is a commonly used nickel-copper corrosion-resistant alloy. It has excellent corrosion resistance in hydrofluoric acid and fluorine gas.

GH3039 and other high temperature alloy series
models: GH3039, GH3030, GH4169
high temperature alloy series materials · Commonly used high temperature alloy series materials
Chinese brand basic composition characteristics and uses
GH1131Fe/Cr/Ni solid solution strengthened iron-based high temperature alloy, turbine engine combustion chamber and other high temperature parts working below 900℃
GH1140Fe/Cr/Ni solid solution strengthened iron-based high temperature alloy, high temperature parts working temperature above 800℃
GH2132Fe/Cr/Ni/Ti/Mo/VA-286, good hot processing plasticity and cutting processability, stamping welding parts and fastening parts materials
GH3030Ni/Cr good oxidation resistance and processing performance, temperature measuring thermocouple protection tube, used in high temperature oxidizing atmosphereGH3039Ni
/Cr/Mo has sufficient lasting strength at 800℃, good cold and hot fatigue performance and anti-carburization performance, easy to weld and cold stamping
GH4169Ni/Cr/Mo/NbInconel 718, oxidation resistant and heat-resistant material, used for ultra-high strength fasteners.