Full Transcript:

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)


304 Chemistry

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!