ASTM A213 TP321H Stainless Steel Seamless Pipe

What is ASTM A213 TP321H?

ASTM A213 TP321H is the high-carbon titanium-stabilized austenitic stainless steel seamless pipe, optimized for high-temperature creep strength. It is specially used in high-temperature, high-stress boiler tubes and superheater components.

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 content enhances high-temperature creep strength, maintaining stability under 600-870°C stress • Titanium stabilization ensures excellent post-weld intergranular corrosion resistance, matching high-temperature performance • Mandatory post-weld annealing to maximize high-temperature creep and corrosion resistance • Suitable for critical high-temperature pressure piping in power plants and industrial boilers

TP321 vs TP321H (Horizontal)

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

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.