201/304/316L/310S/409L/904L Seamless/Welded Decorative/Indurtrial Stainless Steel Round Tube Pipe

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Introduction

904L Stainless Steel Seamless tube

1 chemical component of 904L stainless steel

CR 19-23 NI 23-28 MO 4-5 CU 1-2 C<0.02 MN <0.2 SI<1

904L Stainless Steel Seamless tube Advantages:

(1): Light weight: Compared with solid steel pipes, it has the advantages of light weight and economic benefits.

(2): Wide application fields: It is widely used in pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. At the same time, it can also be used to manufacture structural parts and mechanical parts, such as petroleum drill rods, automotive transmission shafts, bicycle frames, and steel scaffolding used in building construction. Materials and working hours, such as rolling bearing rings, jack sleeves, etc.

(3): stainless steel, with high strength, high corrosion resistance, acid and alkali resistance and other properties.

(4): Complete specifications and rich products. Meet the needs of different industries.

Super Austenitic Stainless Steel 904L (00Cr20Ni25Mo4.5Cu; UNS: N08904; EN: 1.4539) is a high alloy austenitic stainless steel with low carbon content that resists corrosion well in dilute sulfuric acid and is designed for harsh corrosion conditions. It has high chromium content and sufficient nickel content. The addition of copper makes it have strong acid resistance, especially high resistance to chloride gap corrosion and stress corrosion cracking, and is not easy to appear corrosion spots and cracks. The pitting resistance is slightly better than other steel, with good machinability and weldability, and can be used in pressure vessels.

Brand and standard:

UNS N08904 (ASME and ASME 1967), DIN1.4539 (German standard), ASTM A240 (ASME; The new standard will be classified as stainless steel series, the original standard ASME SB-625 will be classified as nickel base alloy series), SUS890L.

Metallographic structure of 904L stainless steel:

904L is a complete austenitic structure. Compared with common austenitic stainless steel with high molybdenum content, 904L is not sensitive to ferrite and α phase precipitation.

Physical and mechanical properties:

Density: 8.0g/cm3. Tensile strength: σb≥520Mpa. Elongation: δ≥35%. Corrosion resistance of 904L stainless steel:

Because 904L has a very low carbon content (maximum 0.020%), no carbide will be precipitated under normal heat treatment and welding conditions. This eliminates the risk of intergranular corrosion that usually occurs after heat treatment and welding. Due to its high chromoly 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 results in low corrosion rate even in active state. In the concentration range of 0~98% pure sulfuric acid, 904L can be used at temperatures up to 40 degrees Celsius. In the range of 0~85% concentration of pure phosphoric acid, its corrosion resistance is very good. In industrial phosphoric acid produced by wet process, impurities have a strong effect on corrosion resistance. Among all phosphoric acids, 904L has better corrosion resistance than ordinary stainless steel. In highly oxidizing nitric acid, 904L has lower corrosion resistance than high-alloyed steel without molybdenum. In hydrochloric acid, the use of 904L is limited to the lower concentrations of 1-2%. In this concentration range. The corrosion resistance of 904L is better than that of conventional stainless steel. 904L steel has high resistance to point corrosion. It also has good corrosion resistance to cracks in chloride solution. The high nickel content of 904L reduces corrosion rate in pitting 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 stainless steels. Due to its high nickel content, 904L is highly resistant to stress corrosion cracking in chloride solutions, concentrated hydroxide solutions, and hydrogen sulfide rich environments.

904L applications, application range, application fields are:

Petroleum and petrochemical equipment, such as reactors in petrochemical equipment, etc.

Sulfuric acid storage and transportation equipment, such as heat exchanger.

* Power plant flue gas desulfurization device, the main use parts are: absorption tower body, flue, door plate, internal parts, spray system, etc.

Scrubbers and fans in organic acid treatment systems.

* Seawater treatment equipment, seawater heat exchanger, paper industry equipment, sulfuric acid, nitric acid equipment, acid making, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment.

* Pharmaceutical factory: centrifuge, reactor, etc.

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

* The strong corrosive medium 904L for dilute sulfuric acid is a match for steel.

Similar steel grade & equivalent steel materials:

Product application areas:

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