Super Duplex

1.4460 (DIN 1.4460) is a super duplex stainless steel based upon 25% chromium content, also specified as UNS S32900, AISI 329 and EN X3CrNiMoN27-5-2. ‘Duplex’ stainless steels are a family of stainless steels that contain a mixed microstructure of austenite and ferrite phases. They offer a combination of good corrosion resistance and high strength, making […]

DIN 1.4462 is a duplex stainless steel based upon a 22% chromium content. It can also be referred to as UNS S31803 (ASTM A182 F51) or UNS S32205 (ASTM A182 F60) when supplied as solid bar. The grade known as DIN 1.4462 was originally developed in the 1930s for application in paper and pulp manufacture. […]

UNS S31803 is a duplex stainless steel based upon a 22% chromium content, whereas SS316 is an austenitic stainless steel based upon an 18% chromium content. They have significantly different physical and tensile properties due to their different composition and microstructure. S31803 has better corrosion resistance and higher strength, but SS316 may be used for […]

UNS S31803 is a duplex stainless steel based upon a 22% chromium content. It is also identified at DIN 1.4462 and ASTM A182 F51. Developed in the 1930s for application in paper and pulp manufacture, it provided twice the strength and provide a significant uplift in corrosion resistance compared to the more general 304/316 stainless […]

S31803 is a duplex stainless steel based on a chromium content of 22% and can also be referenced as DIN 1.4462 and ASTM A182 F51 when supplied as round bar. Developed in the 1930s for application in paper and pulp manufacture, it provided twice the strength and a significant uplift in corrosion resistance compared to […]

S31803 is almost identical to S32205 in terms of both composition, physical and tensile properties. S32205 is achieved by producing S31803 with certain elements – chromium, nickel and molybdenum, controlled to the upper limit of their range. As these three elements account for the resistance to pitting corrosion S32205 has a slightly improved and more […]

Duplex stainless steels have many attractive properties, with their high strength and excellent corrosion resistance achieved in a cost-effective way. As such, they have become widely used in a wide variety of applications. However, there are instances where their characteristics are not best suited and other grades may have to be used. ‘Duplex’ stainless steels […]

A duplex stainless steel is named because it has a ‘duplex’ microstructure, meaning a balance of austenitic and ferritic grains. This means that duplex stainless steels combine physical and mechanical properties of both, making them an attractive and cost-effective proposition. Austenitic stainless steels generally provide excellent corrosion resistance, good mechanical properties over a wide range […]

Super duplex stainless steels are grades that have a combination of austenitic and ferritic microstructures, based upon a chromium content of 25%. There have been a large number of grades developed over the last 50 years that meet this basic classification. However, the most popular ones are described below. UNS S32550 equates to Ferralium 255, […]

1.4410 is shorthand for DIN 1.4410, a super duplex stainless steel also identified by the specifications UNS S32750 and ASTM A182 F53. This particular 25% Cr super duplex stainless steel was originally developed by Sandvik (now Alleima) during the 1990’s and marketed as SAF2507. ‘Duplex’ stainless steels are a family of stainless steels that contain […]

The hardness of S32750 can vary from product form to product form, and from batch to batch. For solid bars of S32750 supplied to the common specifications of ASTM A182, ASTM A276 and ASTM A479, the maximum hardness allowable is 310 HB (Brinell Harness). For wrought and cast super duplex stainless steels such as S32750, […]

UNS S32750 is a super duplex stainless steel, also referred to as ASTM A182 F53 and DIN 1.4410. This particular 25% Cr super duplex stainless steel was originally developed by Sandvik (now Alleima) during the 1990’s and marketed as SAF2507. With an increased chromium content compared with F51 it offers improved pitting corrosion resistance.  The […]