Approx. Rs 250 / KgGet Latest Price
|Steel Grade||S32205, S31803, 2205|
SS Duplex 2205 (UNS S32205 / EN 1.4462):
Fe, <0.03% C, 21-23% Cr, 4.5-6.5% Ni, 2.5-3.5% Mo, 0.8-2.0% N, <2% Mn, <1% Si, <0.03% P, <0.02% S
Duplex 2205 stainless steel (both ferritic and austenitic) is used extensively in applications that require good corrosion resistance and strength. The S31803 grade stainless steel has undergone a number of modifications resulting in UNS S32205, and was endorsed in the year 1996. This grade offers higher resistance to corrosion.
At temperatures above 300°C, the brittle micro-constituents of this grade undergo precipitation, and at temperatures below -50°C the micro-constituents undergo ductile-to-brittle transition; hence this grade of stainless steel is not suitable for use at these temperatures.
Corrosion resistance is a critical component of materials built to withstand natural disasters. Duplex stainless steel is less prone to damage by stress corrosion cracking. It also offers good corrosion fatigue strength and its microstruction and small carbon magnitude allow duplex steel to stand up against intergranular attack. Duplex grades have high surface toughness and can stand up to conditions of heavy water, sand or salt crystals.
All of this was taken into consideration when Type 2205 was chosen for the entrances of South Ferry Station on Manhattan Island. Sealable waterproof structures like these, made of Duplex 2205, protect the subway system from water infiltration during natural disaster events like Hurricane Sandy in 2012.
High corrosion-resistant and high strength UNS S32205 can withstand the brackish or salt water impact of a coastal flood surge. This quality along with long service life and low maintenance requirements led to the use of 2205 duplex stainless steel in pedestrian bridges. The Helix in Marina Bay, Singapore and the Harbor Drive Pedestrian Bridge in San Diego, CA both use 2205 as a primary structural material providing high strength, sustainable structures with cutting-edge design.
2205 is the most widely used duplex (ferritic/austenitic) stainless steel grade. It finds applications due to both excellent corrosion resistance and high strength. The standard duplex S31803 composition has over the years been refined by many steel suppliers, and the resulting restricted composition range was endorsed as UNS S32205 in 1996. Duplex S32205 gives better guaranteed corrosion resistance, but for much of the Duplex S31803 currently produced also complies with Duplex S32205. 2205 is not generally suitable for use at temperatures above 300ºC as it suffers from precipitation of brittle micro constituents, nor below -50ºC because of its ductile-to-brittle-transition.
Solution treatment (annealing) – heat to 1020ºC-1100ºC and cool rapidly. This grade cannot be hardened by thermal treatment, but does work harden.