Showing posts with label austenitic stainless steels. Show all posts

Tuesday, February 3, 2015

Stainless Steels: High Temperature Resistance By yaang.com

Stainless steels are most commonly used for their corrosion resistance. The second most common reason stainless steels are used is for their high temperature properties; stainless steels can be found in applications where high temperature oxidation resistance is necessary, and in other applications where high temperature strength is required. The high chromium content which is so beneficial to the wet corrosion resistance of stainless steels are also highly beneficial to their high temperature strength and resistance to scaling at elevated temperatures.

Introduction To Stainless Steels Grades And Families By yaang.com

Stainless steels are iron-based alloys containing a minimum of about 10.5% chromium; this forms a protective self-healing oxide film, which is the reason why this group of steels has their characteristic "stainlessness" or corrosion resistance. The ability of the oxide layer to heal itself means that the steel is corrosion resistant, no matter how much of the surface is removed. This is not the case when carbon or low alloy steels are protected from corrosion by metallic coatings such as zinc or cadmium or by organic coatings such as paint.

Can I use stainless steel at low temperatures or high temperatures?

Can I use stainless steel at low temperatures?

Austenitic stainless steels are extensively used for service down to as low as liquid helium temperature (-269 deg C). This is largely due to the lack of a clearly defined transition from ductile to brittle fracture in impact toughness testing.

How many types of stainless steel are there? by yaang.com

Stainless steel is usually divided into 5 types:

Precipitation hardening (PH) Stainless Steels - These stainless steels can develop very high strength by adding elements such as Copper, Niobium and Aluminium to the stainless steel. With a suitable “aging” heat treatment, very fine particles form in the matrix of the stainless steel which imparts strength.