Stainless, Duplex, Super Duplex

Grade 304 (L)

UNS S30400 : ASTM A182 (VO1.01), A276 (VO1.03), A479 (VO1.03), BS EN 10088

General scope

304L is an austenitic stainless steel from the 300 series 18/8 family. 304L is similar in composition to 316L. Nickel and Chromium are slightly modified and there is no Molybdenum addition.

Normally supplied Solution Annealed/Treated although it can be supplied cold worked with higher strength properties. The "L" grade has a reduced carbon level to improve corrosion resistance after welding, and generally is more commonly available.

NACE MR0175 - 2003 "general use" approval now limits the maximum environmental temperature to 140°F (60°C).

Chemical composition


L grade limits C to 0.03 max.
L grade increases Ni to 12.00% max.
Min 18.00 8.00 0.00
Max 0.08 1.00 2.00 0.045 0.030 20.00 10.50 0.10 0.00

Mechanical properties

Condition: Solution Annealed

NACE MR0175 limits the supply hardness to 22 HRC max.
U.T.S 75 KSI Min (515 N/mm2)
0.2% Proof Stress 30 KSI Min (205 N/mm2)
Elongation 30 %  
Red of Area 50 %  
CVN Impacts @ -75°C (-100°F) 135 Joules (100 ft-lbf)
Size range: 1/2”∅ - 12”∅

Primarily manufactured in:

  • Dubai, UAE
  • Edmonton, Canada
  • Houston, Texas
  • Sheffield, UK
  • Cumbernauld, UK
  • Singapore
  • Malaysia

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