ASTM A312 TP321H Stainless Steel Bright Annealing Pipe

Gnee offers high-quality stainless steel products, exporting to over 60 countries.If you are seeking ASTM A312 TP321H stainless steel piping-resistant to both intergranular corrosion and high-temperature creep-for applications in thermal power generation, petrochemicals, coal chemicals, or HVAC energy systems, we can provide fully compliant products and solutions.

Our ASTM A312 TP321H pipes are manufactured using precise melt chemistry that strictly adheres to the ASTM A312 standard, guaranteeing a titanium content of ≥4 × (carbon + nitrogen). We employ a multi-pass precision cold-rolling process followed by fully automated fixed-length cutting, maintaining a strict tolerance of +6mm/0mm to ensure uniform finished lengths. These pipes withstand repeated welding and long-term cycling within the 425–815°C temperature range without suffering intergranular corrosion or delayed weld-seam leakage, thereby significantly reducing downtime and maintenance costs.

We eschew standard open-air annealing in favor of a sealed, high-purity gas bright annealing process. By completely isolating the material from air, we ensure a uniform, bright, and oxide-free finish on both the inner and outer surfaces. The smooth interior prevents scaling and ensures stable heat transfer, while minimizing carbon buildup and clogging in thermal oil and hydrogen pipelines. Furthermore, every batch comes with a detailed chemical composition report and supports PMI (Positive Material Identification) testing; with full compliance guaranteed, you need not worry about project delays caused by failed re-inspections.

ASTM A312 TP321H  seamless Pipe

ASTM A312 TP321H  round Pipe

ASTM A312 TP321H Bright Annealing Pipe

 

We also offer customization services to meet the diverse needs of consumers; if you are interested, please click below to contact us, and a member of our professional team will get back to you.

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Chemical Composition

Grade	C	Mn	Si	P	S	Cr	Mo
321H	0.04-1.0	≤2.0	≤0.75	≤0.08	≤0.03	17.0-19.0	-

Mechanical Properties

Grade	Tensile Strength ksi(MPa)	Yield Strength ksi(MPa)	Elongation (% in 50mm)	Hardness
				Rockwell	Brinell (HB)
321H	≥75(515)	≥30(205)	≥35	≤90HRB	≤192HBW

Physical properties

Density	7.90 g/cm3
Melting Range	1398∼1427∘C
Specific Heat Capacity	℃
Thermal Conductivity	16.3 W/(m⋅K) at 20∘C; 24.5 W/(m⋅K) at 500∘C
Linear Thermal Expansion Coefficient	17.2×10−6 /∘C ()
Electrical Resistivity	0.74 μΩ⋅m
Elastic Modulus	193 GPa (room temperature)

Grade Specification Comparison

Grade	UNS No	EN		Gb	JIS
		No	Name
321H	S32109	1.4878	X10CrNiTi18-10	1Cr18Ni9Ti	SUS 321H

Dimensional tolerance

Outer Diameter (OD) Tolerance:

Steel pipe outer diameter (D) range	Standard tolerance	Commonly used corresponding specifications
10.29 ≤ D ≤ 48.26(NPS 1/8 ~ NPS 2.5)	+0.40 / -0.80	DN25 (outer diameter 33.7 mm)
48.26 ＜ D ≤ 114.30(NPS3~NPS4)	+0.80 / -0.80	DN50(60.3mm),DN80(88.9mm)
114.30 ＜ D ≤ 219.08	+1.60 / -0.80	DN100,DN125,DN150
219.08 ＜ D ≤ 457.20	+2.40 / -0.80	DN200~DN400

Wall thickness tolerance:

Nominal Pipe Size (NPS)	Upper deviation of wall thickness	Negative wall thickness deviation
NPS 1/8 ~ NPS 2.5	+20%	-12.5%
NPS3 ~ NPS18,t/D ≤5%	+22.5%	-12.5%
NPS3 ~ NPS18,t/D ＞5%	+15%	-12.5%
Seamless pipe with NPS ≥ 20: t/D ≤ 5%	+22.5%	-12.5%
Seamless pipe with NPS ≥ 20: t/D > 5%	+15%	-12.5%

 ASTM A312 TP321H  sS pipe Application 

I. Power Generation Industry
Heat exchanger tubes for boiler superheaters, reheaters, and waste heat boilers, etc.
II. Petrochemical and Coal Chemical Industries
High-temperature heat transfer oil circulation piping, ventilation ducts,  etc.
III. Heat Treatment and Industrial Furnaces
Piping for conveying protective gases (hydrogen, nitrogen, dissociated ammonia) for carburizing, nitriding, and vacuum annealing furnaces, etc.
IV. Engines, Construction Machinery, and Transportation
High-temperature cooling piping for rail vehicle power systems, etc.

Price of ASTM A312 TP321H Cold-Rolled Bright-Annealed Pipe

Specification	DN	Outside Diameter × Nominal Wall Thickness	Batch size ≥ 1 ton (USD/kg)	Small batch 500–1,000 kg (USD/kg)
NPS1 SCH40	DN25	33.7×3.38mm	4.25~4.70	4.80~5.30
NPS2 SCH40	DN50	60.3×3.91mm	4.10~4.55	4.65~5.15
NPS3 SCH40	DN80	88.9×5.49mm	4.00~4.40	4.50~5.00
SCH80	DN25	33.7×6.55mm	4.45~4.95	5.00~5.60
SCH80	DN50	60.3×7.82mm	4.35~4.85	4.90~5.50
SCH80	DN80	88.9×8.56mm	4.25~4.75	4.80~5.40

Comprehensive product testing

We can issue comprehensive MTCs (Material Test Certificates) compliant with ASTM standards, detailing full heat numbers and actual measured values ​​for all elements. We also provide EN 3.1 (mill self-inspection) and EN 3.2 (third-party witnessed) certificates, meeting the rigorous requirements for domestic pressure piping inspections, overseas commercial inspections, and strict audits by clients in the nuclear power and chemical industries.

Inner wall measurement

 

Certificate of Product Quality

Outer diameter measurement

High-quality packaging

The steel pipes are packaged by fitting solid, high-density plastic plugs or rubber protective caps of the appropriate size to both ends to tightly seal the openings; they are then wrapped in plastic and either bundled or packed in stacked wooden crates, with appropriate protective measures taken to ensure safety during transport or to meet seaworthiness requirements.

Plastic packaging

Wooden box packing

 

Sealed at both ends

Customer visit

GNEE supplies 316 stainless steel pipes for export to over 60 countries and regions, including the United States, Mexico, Venezuela, Kuwait, Colombia, Turkey, Italy, Brazil, France, Iran, and Vietnam.

FAQ

1.What is ASTM A312 Tp321h material?

ASTM A312 Tp321h is a high carbon version of the titanium stabilized austenitic stainless steel. It has 18% chromium and 8% nickel in the common composition and therefore is called as the 18/8 steel as well.

 

2.Is 321 stainless steel magnetic or nonmagnetic?

No, 321 stainless steel is not magnetic when it is in its normal annealed condition. It belongs to the austenitic family of stainless steels, which have a face-centered cubic crystal structure that makes them non-magnetic.

 

3.What are the key differences between stainless steel 321 and 316?

The stainless steel 316 features corrosion resistance, excellent formability, and minimal effect at high temperatures. Stainless Steel 321 comes with more titanium content of titanium. Titanium boosts its internal corrosion which helps during welding and other temper sensitive work

 

 

 

 

 

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