1.4507 is the DIN reference for a 25% chromium super duplex stainless steel, better known as Ferralium® 255.

Ferralium® 255 was the first commercially produced super duplex stainless steel, developed by Langley Alloys. Launched in 1969, it has now provided more than 50 years of service in a wide range of demanding applications. Its general composition has been standardised as DIN 1.4507, UNS S32550 and ASTM A182 F61.

What sets Ferralium® 255 apart

Compared with other super duplex stainless steels, Ferralium® 255 contains up to 2% copper to support increased resistance to sulphuric acid. It is also still the only super duplex stainless steel to achieve a minimum yield strength of 85ksi (586N/mm2) as solid bar, compared with a minimum of 80ksi (550N/mm2) for other grades.

Ferralium® 255 (S32550) is available only from Langley Alloys, as round bar from 1/2"-14" (12.7-355.6mm), plate up to 3" (76.2mm), pipe, flanges and fittings.

Related duplex and super duplex grades

We also carry the other most popular duplex and super duplex stainless steels. We stock S31803 (DIN 1.4462, ASTM A182 F51) from 5/8" (15.87mm) up to 450mm diameter solid bars, plus plate up to 3" (76.2mm) thick, pipes in scheduled sizes, hollow bars, flanges and fittings. We stock S32760 (DIN 1.4501, ASTM A182 F55) and S32750 (DIN 1.4410, ASTM A182 F53) solid bars from 5/8" to 20" (15.87-508mm) diameter, plate up to 3" (76.2mm) thick, plus pipes in scheduled sizes, fittings and flanges.