904L industrial metal woven wire mesh, GFW stainless steel wire mesh, filter mesh, screen mesh, wire mesh material application industry introduction

904L industrial metal woven wire mesh, GFW stainless steel wire mesh, filter mesh, screen mesh, wire mesh material application industry introduction
904L is also known as UNS N08904, DIN1.4539, ASTM A240, nickel-based alloy, SUS890L;
904L material introduction:
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 also 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.
Main ingredients: 20Cr-24Ni-4.3Mo-1.5Cu

Brands and standards: UNS N08904, DIN1.4539, ASTM A240 (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: 8.24g/cm3. Tensile strength: σb≥520Mpa. Elongation: δ≥35%.
904L
904L stainless steel corrosion resistance:
Since the carbon content of 904L is very low (maximum 0.020%), no carbide will precipitate under normal 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 reducing environments such as sulfuric acid and formic acid.
The high nickel content makes it have a lower corrosion rate in the active state. In pure sulfuric acid in the concentration range of 0~98%, the use 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 strongly oxidizing nitric acid, 904L has lower corrosion resistance than high-alloyed steels without molybdenum. In hydrochloric acid, the use of 904L is limited to a lower concentration 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 steel 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 stainless steel. Due to the high nickel content, 904L has a high resistance to stress corrosion cracking in chloride solutions, concentrated hydroxide solutions and hydrogen sulfide-rich environments.
Supporting welding materials: welding rods (E385-16/17), welding wires (ER385).
The uses, application range and application fields of 904L are:
* Petroleum and petrochemical equipment, such as reactors in petrochemical equipment.
* Storage and transportation equipment for sulfuric acid, such as heat exchangers.
* Flue gas desulfurization devices in power plants, the main use parts are: tower body, flue, baffle plate, internal parts, spray system, etc. of the absorption tower.
* Scrubbers and fans in organic acid treatment systems.
* Seawater treatment equipment, seawater heat exchangers, papermaking industry equipment, sulfuric acid, nitric acid equipment, acid making, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment.
* Pharmaceutical factories: centrifuges, reactors, etc.

* Plant foods: soy sauce tanks, cooking wine, salt tanks, equipment and dressings.

Application Notes for 904L
1. Processing performance
1.1 Welding performance
Like general stainless steel, 904L can be welded by various welding methods. The most commonly used welding methods are manual arc welding or inert gas shielded welding. The metal of the welding rod or wire is based on the composition of the base material and has a higher purity. The molybdenum content is required to be higher than that of the base material. Generally, no preheating is required before welding. However, in cold outdoor operations, the joint or adjacent areas can be evenly heated to avoid condensation of water vapor. Be careful not to exceed 100℃ for local temperature to avoid carbon accumulation and intergranular corrosion. When welding, it is advisable to use a small line energy, continuous and fast welding rate. Generally, no heat treatment is required after welding. If heat treatment is required, it must be heated to 1100~1150℃ and then cooled rapidly.
1.2 Machining performance The machining characteristics of 904L are similar to those of other austenitic stainless steels. There is a tendency to stick to the tool and work hardening during machining. Positive rake carbide tools must be used, and sulfide and chlorinated oils must be used as cutting coolants. Equipment and processes should be based on reducing work hardening. Avoid slow cutting speed and feed rate during cutting.
904L industrial metal woven wire mesh, GFW stainless steel wire mesh, filter mesh, screen mesh, wire mesh material application industry introduction
904L is also known as UNS N08904, DIN1.4539, ASTM A240, nickel-based alloy, SUS890L;
904L material introduction:
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 also 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 at normal pressure and mixed acid of formic acid and acetic acid.
Main ingredients: 20Cr-24Ni-4.3Mo-1.5Cu

Brand and standard: UNS N08904, DIN1.4539, ASTM A240 (the new standard classifies it as a stainless steel series, 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: 8.24g/cm3. Tensile strength: σb≥520Mpa. Elongation: δ≥35%.
  904L
904L stainless steel corrosion resistance:
Since the carbon content of 904L is very low (maximum 0.020%), no carbide will precipitate under normal 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 reducing environments such as sulfuric acid and formic acid. The
high nickel content makes it have a low corrosion rate even 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 strongly oxidizing nitric acid, 904L has lower corrosion resistance than high-alloyed steels without molybdenum. In hydrochloric acid, the use of 904L is limited to a lower concentration of 1-2%. In this concentration range.
904L has better corrosion resistance than conventional stainless steel. 904L steel has high resistance to pitting corrosion. It also has good resistance to crevice corrosion in chloride solutions. The high nickel content of 904L reduces the corrosion rate at pits and crevices. Ordinary austenitic stainless steel 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 stainless steel. Due to its high nickel content, 904L has high resistance to stress corrosion cracking in chloride solutions, concentrated hydroxide solutions and hydrogen sulfide-rich environments.
Supporting welding materials: welding rods (E385-16/17), welding wires (ER385).
904L uses, application ranges and application fields include:
* Petroleum and petrochemical equipment, such as reactors in petrochemical equipment.
* Storage and transportation equipment for sulfuric acid, such as heat exchangers.
* Flue gas desulfurization equipment in power plants, the main use parts are: tower body, flue, baffle plate, internal parts, spray system, etc. of the absorption tower.
* Scrubbers and fans in organic acid treatment systems.
* Seawater treatment equipment, seawater heat exchangers, papermaking industry equipment, sulfuric acid and nitric acid equipment, acid making, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment.
* Pharmaceutical factories: centrifuges, reactors, etc.

* Plant foods: soy sauce tanks, cooking wine, salt tanks, equipment and dressings.

904L Application Notes
1. Processing performance
1.1 Welding performance
Like general stainless steel, 904L can be welded by various welding methods. The most commonly used welding methods are manual arc welding or inert gas shielded welding. The electrode or wire metal is based on the composition of the base metal and has a higher purity. The molybdenum content is required to be higher than that of the base metal. Generally, no preheating is required before welding. However, in cold outdoor operations, the joint or adjacent areas can be heated evenly to avoid condensation of water vapor. Be careful not to let the local temperature exceed 100℃ to avoid carbon accumulation and intergranular corrosion. When welding, it is advisable to use a small line energy, continuous and fast welding rate. Generally, no heat treatment is required after welding. If heat treatment is required, it must be heated to 1100~1150℃ and then cooled rapidly.

1.2 Machinability The machining characteristics of 90 4 L are similar to those of other austenitic stainless steels. There is a tendency for tool sticking and work hardening during machining. Positive carbide cutting tools must be used, and sulfide and chlorinated oils must be used as cutting coolants. Equipment and processes should be based on reducing work hardening. Slow cutting speeds and feeds should be avoided during cutting.

904L Chemical Properties:

904L Mechanical Properties:

Minimum mechanical properties of 904L alloy at room temperature :