UNS S31803 is a duplex stainless steel. It is also known as ASTM grade F51 and European designation 1.4462. We supply this material with EN 10204 Type 3.2 certification. This is a high level certificate that confirms compliance with specifications through independent testing.

UNS S31803 combines ferritic and austenitic stainless steels. It uses a balanced 50/50 microstructure. This provides both strength and corrosion resistance. As a result, it performs well in demanding environments. These include the oil and gas, pulp and paper, and chemical industries.

PREN Number

The Pitting Resistance Equivalent Number (PREN) of S31803 is typically 34 or higher. This indicates strong resistance to corrosive environments. A PREN above 34 is considered good to excellent.

Because of this, S31803 performs well in challenging conditions. These include environments exposed to pitting corrosion, such as seawater. It also outperforms lower PREN grades. For example, 316 stainless steel has a PREN of around 25.

Tensile Strength

S31803 has a typical tensile strength of 620 MPa. In some cases, it ranges from 650 to 880 MPa depending on the product.

This is higher than standard austenitic grades. For example, 304 stainless steel typically ranges from 500 to 700 MPa. The increased strength allows the material to withstand greater force before deforming or breaking.

As a result, S31803 is well suited to high-stress applications. These include chemical processing, oil and gas, marine, power generation, and catering equipment. It handles heavy loads reliably and improves safety and lifespan.

Key Benefits

S31803 offers a yield strength between 450 MPa and 600 MPa at room temperature. This makes it a high-strength material. It can withstand significant stress before deforming. Because of this, it is suitable for heavy load environments such as construction and machinery.

The material also has good weldability. It has lower thermal expansion than austenitic stainless steels. This reduces distortion and residual stress during welding. As a result, structural integrity is improved. It also increases precision and efficiency.

In addition, this helps prevent cracking, corrosion, and premature wear. Therefore, S31803 is a reliable and durable material.

S31803 also provides a strong balance of cost and performance. Its high strength and PREN offer durability and corrosion resistance. At the same time, it remains cost effective.

Our UNS S31803 Capabilities

We offer UNS S31803 in thicknesses from 1mm to 100mm. Maximum length is 12,000 mm, and maximum width is 3,000 mm.

All materials are certified to NORSOK and PED 2014/68/EU. They are also supplied with EN 10204 3.2 certification.

Interested in UNS S31803 (1.4462)?  Contact us today!

Want to know the difference between UNS S31803 & S32205?

Find out here – https://masteel.co.uk/news/s31803-s32205-difference/