What is 304H Stainless Steel

304H (UNS S30409, 1.4307, SUS304H) is the high-carbon variant of 304, designed for high-temperature creep strength, suitable for high-temperature stress-bearing components.

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N
304	min.	-	-	-	-	-	18.0	-	8.0	-
	max.	0.08	2.0	0.75	0.045	0.030	20.0		10.5	0.10
304L	min.	-	-	-	-	-	18.0	-	8.0	-
	max.	0.030	2.0	0.75	0.045	0.030	20.0		12.0	0.10
304H	min.	0.04	-	-	-0.045	-	18.0	-	8.0	-
	max.	0.10	2.0	0.75		0.030	20.0		10.5

Equivalent Grades (Horizontal)

UNS: S30409 | JIS: SUS304H | GB: 07Cr19Ni10 | EN: X6CrNi18-10

Chemical Composition (wt%, Horizontal)

C: 0.04-0.10 | Si: ≤1.00 | Mn: ≤2.00 | P: ≤0.045 | S: ≤0.030 | Cr: 18.00-20.00 | Ni: 8.00-10.50 | N: ≤0.10 | Fe: Balance

Key Properties (20°C, Annealed, Horizontal)

Density: 7.93g/cm³ | Melting Point: 1400-1450°C | Tensile Strength: ≥515N/mm² | 0.2% Yield Strength: ≥205N/mm² | Elongation: ≥40% | Hardness (HB): ≤201

Core Characteristics

Superior high-temperature creep strength (600-870°C); good high-temperature oxidation resistance; mandatory post-weld annealing; suitable for high-temperature stress scenarios.

304 vs 304H (Horizontal)

Carbon Content: 304 (≤0.08%) | 304H (0.04-0.10%) | High-Temp Creep: 304 (Ordinary) | 304H (Excellent) | Post-weld Annealing: 304 (Optional) | 304H (Mandatory)

 

 

304 Stainless Steel Suppliers

If you have project requirements for 304 stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.