Duplex 31803 | Intamet Ltd

31803 / 1.4462

31803, also known as 1.4462, is a duplex stainless steel alloy known for high strength, corrosion resistance and improved weldability.

31803, also known as 1.4462, is a duplex stainless steel alloy that combines the properties of both ferritic and austenitic steels. It is composed of 22% chromium, 4.5% nickel, and 3.1% molybdenum, with smaller amounts of other elements such as nitrogen and manganese.

This alloy is known for its high strength, which is roughly twice that of conventional austenitic stainless steels such as 304 and 316. It also has excellent corrosion resistance, particularly in environments that contain chlorides. This resistance is due to the presence of both a ferritic and an austenitic phase in the microstructure of the alloy.

Additionally, 31803 has improved weldability compared to many other duplex alloys, making it a popular choice for applications that require welding. This alloy is commonly used in a wide range of applications such as chemical processing, oil and gas, marine, and desalination. It is also used in pressure vessels, heat exchangers, and piping systems.

However, it is important to note that 31803 has a lower resistance to stress corrosion cracking compared to other duplex alloys like 2205. The alloy also requires a specific heat treatment to achieve its desired properties.

In summary, 31803 is a duplex stainless steel alloy known for its high strength, corrosion resistance, and improved weldability. It is used in a variety of industries and applications, but it requires specific heat treatment and has a lower resistance to stress corrosion cracking than some other duplex alloys.

Chemical Composition of 31803 / 1.4462

The chemical composition of 31803, also known as 1.4462, is as follows:

Chromium (Cr): 22-23%
Nickel (Ni): 4.5-6.5%
Molybdenum (Mo): 3.0-4.0%
Nitrogen (N): 0.14-0.2%
Manganese (Mn): 1.0-2.0%
Phosphorus (P): 0.03% max
Sulfur (S): 0.02% max
Silicon (Si): 1.0% max
Copper (Cu): 0.5% max
Carbon (C): 0.03% max

It's important to note that these percentages may vary slightly depending on the specific manufacturer or supplier of the alloy.

It's also important to note that alloy 31803/1.4462 is widely used in the production of flanges, fittings, pipes, valves and other components for oil and gas industry, chemical, desalination and marine, has a high resistance to corrosion and pitting, and an excellent mechanical strength.

The physical and mechanical properties of 31803, also known as 1.4462, are as follows:

Physical Properties:

Density: 7.8 g/cm3
Thermal expansion coefficient: 14.2 x 10^-6/°C
Thermal conductivity: 13.4 W/m·°C

Mechanical Properties (at room temperature):

Tensile strength: 700-950 MPa
Yield strength: 450-600 MPa
Elongation: 25-35%
Hardness: 260-320 HV

It's important to note that these properties may vary slightly depending on the specific manufacturer or supplier of the alloy, as well as the heat treatment, manufacturing process and the condition of the material.

It's also important to note that alloy 31803/1.4462 has a lower resistance to stress corrosion cracking compared to other duplex alloys like 2205, so it's important to choose the right alloy for the specific application and to design and operate the material under the appropriate conditions.

Physical & Mechanical Properties of 31803 / 1.4462

Variants of Duplex

There are several variants of 31803, also known as 1.4462, that are available in the market. Some of the most common ones

There are several variants of 31803, also known as 1.4462, that are available in the market. Some of the most common ones are:

UNS S31803: This is the standard variant of 31803 and is the most widely used.
UNS S32205: This variant is also known as 2205 and is a higher alloyed version of 31803. It has a higher molybdenum content and a lower nickel content compared to 31803. This variant is more resistant to pitting and stress corrosion cracking than 31803.
UNS S32750: This variant is also known as 2507 and is a super duplex stainless steel alloy. It has a higher chromium and molybdenum content compared to 31803 and 2205. This variant is highly resistant to pitting and stress corrosion cracking, making it suitable for use in harsh environments.
UNS S32760: This variant is also known as Zeron 100 and is a super duplex stainless steel alloy. It has a higher chromium, molybdenum, and tungsten content compared to 31803 and 2205. This variant is highly resistant to pitting and stress corrosion cracking, making it suitable for use in harsh environments.

It's important to note that, each variant has its own specific properties and characteristics, and should be chosen based on the specific application and the conditions of use.