What are 904L Bolts and Nuts?

904L bolts and nuts are super austenitic stainless steel fasteners, or named 1.4539 bolts and nuts or UNS N08904 bolts and nuts, with good activation to passivation transformation ability, and excellent corrosion resistance.

In non-oxidizing acids such as sulfuric acid, formic acid, phosphoric acid has good corrosion resistance, in the neutral chloride-containing medium with good pitting corrosion resistance, and at the same time has a good resistance to crevice corrosion and anti-stress corrosion performance.

The mechanical properties and corrosion resistance of 1.4539 bolts mainly depend on their chemical composition and heat treatment process. Through reasonable composition design and heat treatment process, high strength and high corrosion resistance bolts can be obtained.

904L bolts and nuts

904L Fasteners Factory

904L Fasteners Chemical Composition

904L chemical composition

According to the chemical composition table above, 904L is a very low carbon austenitic stainless steel, it is also high nickel and molybdenum content of special alloy steel. The steel is designed for corrosive conditions in harsh environments.

904L fasteners and other commonly used 300 series stainless steel bolts and nuts, with good resistance to pitting corrosion and crevice corrosion, high resistance to stress corrosion rupture ability, good resistance to intergranular corrosion.

904L Hex Bolts
904L Hex Nuts

Mechanical Properties of 904L Bolts

1.4539/904L bolts mechanical properties, the corrosion-resistant alloy 904L bolts have high strength and excellent toughness. Its tensile strength can reach about 590MPa, yield strength is about 260MPa, and elongation is about 35%.

Corrosion-resistant alloy 904L (1.4539/N08926) bolts are a high-strength, highly corrosion-resistant alloy material that is widely used in the chemical, marine, and aerospace industries. Its mechanical properties and corrosion resistance are key factors to consider when using it.

These indicators of mechanical properties make 904L bolts have excellent load carrying capacity and vibration resistance, and can maintain stable performance under complex working conditions.

904L Bolts
904L Flat Washers

Heat Treatment of 904L Bolts and Nuts

Super Alloy 904L bolts have excellent mechanical properties and corrosion resistance, need to use appropriate heat treatment process to ensure its performance.

UNS N08904 bolts in practical application, according to the specific conditions and requirements to select the appropriate bolt material and heat treatment process to ensure the safe and reliable operation of the equipment.

Ss 904L bolts and Nuts treatment process, the corrosion resistant alloy 904L bolts need to adopt appropriate heat treatment process to ensure its mechanical properties and corrosion resistance.

The use of solution annealing process can improve the toughness and plasticity of 904L bolts. Specifically, the bolt can be heated to about 1100°C, held for a period of time and then cooled to room temperature.

Others, the aging treatment process can also be used to improve the strength and hardness of 904L bolts. The bolt is heated to about 750℃, held for a period of time and then cooled quickly.

904L stainless steel Hex Bolts
904L stainless steel Hex Cap screws

Comparison Between 904L and Common Stainless Steel in Various Situations

Under all kinds of phosphoric acid, 904L has better corrosion resistance than ordinary stainless steel.

When it in strongly oxidizing nitric acid, 904L has lower corrosion resistance than highly alloyed steels without molybdenum.

Or 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.

Stainless Steel 904L has high resistance to pitting corrosion. Its resistance to crevice corrosion in chloride solutions is also excellent.

The high nickel content of 904L reduces the rate of corrosion at pits and crevices.

Ordinary austenitic stainless steels can be sensitive to stress corrosion at temperatures above 60 degrees Celsius in a chloride-rich environment, and this sensitization can be reduced by increasing the nickel content of the stainless steel.

Due to the high nickel content, 904L has a high resistance to stress corrosion rupture in chloride solutions, concentrated hydroxide solutions and hydrogen sulfide rich environments.

ss 904L hex screws
Stainless steel 904L Bolts

904L Bolt and Nut Applications

Bolts and nuts 904L are widely used in the field of thermoelectricity, such as thermal power plants, nuclear power plants, etc. They can also be used in the fields of petrochemicals, fertilizers, and paper making.

For these fields, 1.4539 bolts and nuts can be used to connect a variety of high-temperature, high-pressure, highly corrosive equipment, such as boilers, reactors, pipelines and so on.

Frankly, 904L fastener is a super austenitic stainless steel material with excellent mechanical properties and corrosion resistance, widely used in various fields.

In the process of manufacture and use, its precision and quality need to be strictly controlled to ensure the stability and reliability of its mechanical properties and corrosion resistance.

Stainless steel 904L Hex Head Bolts
super stainless 904L fasteners
904L allen head screws

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