SUS304H Stainless Steel: High-Carbon Grade for Elevated Temperatures

Unlike 304L, Type 304H has a higher carbon content making the steel more suitable for use in applications where elevated temperatures are present. It is an austenitic chromium-nickel steel alloy and the greater carbon content delivers an increased tensile and yield strength.

Benefits of using Grade 304H stainless steel include:

Higher carbon content gives the material greater heat resistant qualities

Higher tensile yield strength

Greater short and long term creep strength

Applications of 304H Stainless Steel

304H stainless steel is commonly found in the oil refining, gas and chemical industry and is used in industrial boilers, pressure vessels, heat exchangers, pipelines and condensers. The material is also used throughout the power generation industry.

 

Chemical Composition of Grade 304H Stainless Steel

The chemical composition of Grade 304H Stainless Steel is provided in the table below.

UNS NO	Grade	C	Si	Mn	P	S	Cr	Mo	Ni	N
S30409	304H	0.04/0.10	0.75	2.00	0.045	0.030	18.00/20.00	-	8.00/10.50	0.10

Mechanical Properties of Grade 304H Stainless Steel

The mechanical properties of Grade 304H Stainless Steel are provided in the table below.

UNS No	Grade	Proof Stress 0.2% (MPa)	Tensile Strength (MPa)	Elongation A5(%)	Hardness Max
					HB	HRB
S30409	304H	205	515	40	201	92