What’s up guys? This is Michael with Michael Talks Metal back for more metal musings. Today we are beginning a look into stainless steels with an emphasis on types and specifications for aerospace applications.
First up is type 303, sometimes shown as 303 S to differentiate it from 303 SE which is the topic for next week. At this time, I want to give you a moment to smash that like button and help out the channel. Ok, thanks for doing that!
303 is an austenitic stainless steel alloy that is considered to be one of the broadly defined “18-8” stainless steels. The sulfur addition increases the machinability of this grade although some corrosion resistance and welding characteristics are sacrificed.
Where the corrosion performance is adequate, the benefit is in productivity of machined components.
303 can vary in its magnetic response depending on actual chemical composition and any cold work present. It should not be used for critical non-magnetic applications. Strength can be increased by cold work during mill production, but not by heat treatment. The annealed condition provides the best corrosion performance.
This grade of stainless can be known as 303, 303 S, the SAE designation of 30303 and the UNS designation S30300
Density: point 29 lbs per cubic inch
Mean Coefficient of Thermal Expansion from 32 -212 deg F:
9.6 microinch per inch per deg F
Machinability rating: 78 % (of 1212)
303 Chemical Composition
Carbon 0.15 % Max
Copper 1.00 % Max
Manganese 2.00 % Max
Molybdenum 1.00 % Max
Silicon 1.00 % Max
Phosphorus 0.15 % Max
Sulfur 0.15 % Min
Chromium 17.00 – 19.00 %
Nickel 8.00 – 10.00 %
Typical 303 mechanical properties in the annealed condition:
Yield Strength 35,000 psi
Tensile Strength 80,000 psi
Elongation 50 %
Reduction of Area 55 %
AMS 5640 type 1
ASTM A 582
Additional specifications and part requirements can alter what we have shown you here today. So for time number 70 CHECK THE SPECS !!!!!!!!!!! Michlin Metals is a supplier of and distributor of 303 Stainless Steel. Please check out website, www.michlinmetals.com for more info. Thanks for watching, if you made it this far and haven’t subscribed, please do so now, here. If you missed last week’s video, click here. This is Michael with Michael Talks Metal. See you next week, same time, same place. 10am Thursday, I’m out!