304H Stainless Steel Pipe & Tube: High-Carbon High-Temp Creep Resistant Piping

What is 304H Stainless Steel Pipe & Tube?

304H is the high-carbon variant of 304, tailored for high-temperature service, with enhanced creep strength through carbon content optimization, dedicated to high-temperature, high-pressure industrial piping in power and boiler industries.

Equivalent Grades (Horizontal)

UNS: S30409 | JIS: SUS304H | GB: 07Cr19Ni10 | EN: X6CrNi18-10 | W.Nr.: 1.4307

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 | Yield Strength: ≥205N/mm² | Elongation: ≥40% | Hardness: ≤201HB

Core Characteristics

• High-carbon optimization: Significantly improves high-temperature creep strength, maintaining structural integrity at 600-870°C • Good high-temperature oxidation resistance: Adapts to continuous high-temperature service in oxidizing atmospheres • Mandatory post-weld annealing: Optimizes grain structure, ensuring consistent high-temperature performance • Specialized for high-temperature pressure components: Suitable for boiler superheaters and industrial furnace tubes

304H vs 304 Stainless Steel Pipe (Horizontal)

Carbon Content: 304H (0.04-0.10%) | 304 (≤0.08%) | High-Temp Creep: 304H (Excellent) | 304 (General) | Annealing Requirement: 304H (Mandatory) | 304 (Optional) | High-Temp Limit: 304H (≤870°C) | 304 (≤800°C)

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

Stainless Steel Suppliers

If you have project requirements for 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.