321H Stainless Steel Pipe & Tube: High-Carbon Titanium-Stabilized High-Temp Creep Resistant Piping

What is 321H Stainless Steel Pipe & Tube?

321H is the high-carbon variant of 321, combining titanium stabilization with high-carbon-enhanced creep strength. It is specialized for high-temperature, high-stress industrial piping in power and boiler industries.

Equivalent Grades (Horizontal)

UNS: S32109 | JIS: SUS321H | GB: 07Cr18Ni11Ti | EN: X7CrNiTi18-10 | W.Nr.: 1.4541

Chemical Composition (wt%, Horizontal)

C: 0.04-0.10 | Si: ≤1.00 | Mn: ≤2.00 | P: ≤0.045 | S: ≤0.030 | Cr: 17.00-19.00 | Ni: 9.00-12.00 | Ti: ≥5×C | 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 boosts high-temperature creep strength, maintaining stability at 600-870°C under long-term stress • Titanium stabilization: Ensures excellent post-weld intergranular corrosion resistance, matching high-temperature performance • Mandatory post-weld annealing: Optimizes grain structure, maximizing creep resistance and structural uniformity • Critical high-temp component dedicated: Suitable for boiler superheaters and high-pressure high-temp piping

321H vs 321 Stainless Steel Pipe (Horizontal)

Carbon Content: 321H (0.04-0.10%) | 321 (≤0.08%) | Creep Strength: 321H (Excellent) | 321 (Good) | Annealing Requirement: 321H (Mandatory) | 321 (Optional) | High-Temp Stress Adaptability: 321H (Strong) | 321 (General)

 

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N	Other
321	min. max	- 0.08	2.00	0.75	0.045	0.030	17.0 19.0	-	9.0 12.0	0.10	Ti=5(C+N) 0.70
321H	min. max	0.04 0.10	2.00	0.75	0.045	0.030	17.0 19.0	-	9.0 12.0	-	Ti=4(C+N) 0.70

 

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.