What’s up guys? This is Michael with Michael Talks Metal. Today, our video is another common stainless steel found in specifications for aerospace applications.
Type 304 and its low carbon variation 304L are austenitic stainless steels.
Another of the broadly defined “18-8” stainless steels, it is most often used in the solution annealed condition….. aka Cond A. Typical solution anneal is from 1850° to 2050° F followed by rapid cooling to prevent carbide formation.
304 is generally non- magnetic but a slight response can occur when any cold work is present such as that from straightening bars.
304 SAE 30304 UNS S30400
304L SAE 30304L UNS S30403
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: 45 % (of 1212)
Carbon 0.08 % Max *
Manganese 2.00 % Max
Silicon 1.00 % Max
Phosphorus 0.04 % Max
Sulfur 0.03 % Min
Chromium 18.00 – 20.00 %
Nickel 8.00 – 10.50 % **
Molybdenum 1.00% Max
Copper 1.00% Max
* .030 for 304L
** 8.00 – 12.00 for 304L
Typical minimum mechanical properties for 304 in the annealed condition:
Yield Strength 30,000 psi
Tensile Strength 75,000 psi
Elongation 40 %
Reduction of Area 55 %
Specifications for solution treated condition:
AMS 5639: Bars, Forgings, Mechanical Tubing, and Rings – 304
AMS 5560 Seamless Tubing 304
AMS 5513: Sheet, Strip and Plate 304
AMS 5511; Sheet Strip, and Plate 304L
AMS-QQ-S-763 Bars, Shapes, and Forgings
ASTM and ASME standards for commercial applications are too numerous to detail here.
Refer to our website for more information and videos on stainless steels
Additional specifications and part requirements can alter what we have shown you here today. SO CHECK THE SPECS !!!!!!!!!!! This is Michael with Michael Talks Metal. If you missed the previous video click here. If you haven’t subscribed click here. Michlin Metals is a supplier and distributor of 304 and 304L. That’s it for me! See you next Thursday 10am, I’m out!