ASTM A312 TP321 Stainless Steel Seamless Pipe

What is ASTM A312 TP321?

ASTM A312 TP321 is a titanium-stabilized austenitic stainless steel seamless pipe, designed for high-temperature service and post-weld corrosion resistance, widely used in boilers, heat exchangers and exhaust systems.

Equivalent Grades (Horizontal)UNS: S32100 | JIS: SUS321 | GB: 06Cr18Ni11Ti | EN: X6CrNiTi18-10 | W.Nr.: 1.4541

Chemical Composition (wt%, Horizontal)C: ≤0.08 | 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

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

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

Excellent post-weld intergranular corrosion resistance (Ti-stabilized)

Good high-temperature stability (up to 870°C)

Good weldability and formability

Suitable for high-temp, cyclic-heating applications

TP304 vs TP321 (Horizontal)Ti Content: 304 (None) | 321 (≥5×C) | Post-weld Corrosion: 304 (Poor) | 321 (Excellent) | High-Temp Service: 304 (≤800°C) | 321 (≤870°C)

 

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.