Alloy 304/304H (UNS S30400/ S30409)is a modification of the most widely utilized "18-8" chromium-nickel austenitic stainless steel. The carbon content is controlled in the range of 0.04-0.10% for increased strength at temperatures above 800°F (427°C). It is an economical and versatile corrosion resistant alloy suitable for a wide range of general purpose applications.

It is common practice for 304H to be dual certified as 304 and 304H. The high carbon chemistry of 304H enables 304 to meet the mechanical properties and grain size requirements of 304H.

Alloy 304/304Hhas general corrosion resistance similar to 304/304L. It resists atmospheric corrosion, as well as, moderately oxidizing and reducing environments. However, because of its high carbon content, Alloy 304/304H is subject to carbide precipitation in the heat affected zone of welds.

Alloy 304/304H is non-magnetic in the annealed condition, but can become slightly magnetic as a result of cold working or welding. It can be easily welded and processed by standard shop fabrication practices.

STANDARDS
INDUSTEEL TRADEMARKS		UNS	ASTM	EURONORMS EN	SUS
304H/304		S30400/S30409	304(H)	1.4301/1.4948 X5CrNi18-10	SUS 304
CHEMICAL ANALYSIS (%WEIGHT)
C	Cr	Ni	Mo	N	Others
≥ 0,040	18	8	-	-

PROPERTIES
0,2 Y.S. - Rp 0,2min ASTM / EN		0,2 Y.S. - Rp 0,2(2)typical value		UTS - Rm min ASTM / EN		UTS - Rm(2)typical value		EI-A(1)%	PREN(4)	HOMOLOGATIONS
MPa	Ksi	MPa	Ksi	MPa	Ksi	MPa	Ksi			Last revised
-210	30	305	44	520	75	590	86	45	19

APPLICATIONS
CHEMICAL INDUSTRIES			PROCESS INDUSTRIES			WATER TREATMENT			STORAGE & TRANSPORTATION
Nitric Acid	Sulfuric Acid	Polymer& otheracids	Fertilisers	Pulp& Paper	Hydrome-tallurgy	Seawater& desalination	Freshwater &Tanks	Waste Water	Chemical Tanks	Cryogenic Tanks	Renewable

POWER GENERATION				OIL & GAS			CONSTRUCTION
Nuclear	Pollution control	Hydroelectric	Renewable	Off & Onshore & production	Refining & Gas processing	Petrochemical	Architecture	Bridges

For more technical details :
(1) Indicative typical values
(2) Indicative typical values for thickness 20 mm at RT for transverse direction
(3) Hardening 496°C (925°F), 4h, air cooling
(4) PREN = Cr + 3.3 Mo + 16N
(5) PRENW = Cr + 3.3(Mo + 0.5W) + 16N
(6) HT: mechanical properties depend on heat treatment