ASTM A213 TP321H Stainless Steel Seamless Tube for Heat Exchanger

GNEE is a professional manufacturer of high-performance stainless steel tubing, widely used in various critical heat transfer applications. Our ASTM A213 TP321H seamless stainless steel tubing features a bright annealed finish, exhibiting superior corrosion resistance and heat transfer efficiency in demanding heat exchanger systems.

ASTM A213 TP321H is a seamless stainless steel tubing conforming to the ASTM A213 standard, used in high-temperature applications such as boilers, superheaters, and heat exchangers. Due to the absence of weld seams, ASTM A213 TP321H seamless tubing is stronger and more reliable than welded tubing, making it ideal for critical infrastructure projects. The "H" in its designation, particularly "TP321H," indicates higher creep resistance and high-temperature strength, achieved through a higher carbon content than standard 300 series steels.

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ASTM A213 TP321H Stainless Steel Seamless Tube

What's the difference between ASTM A213 TP321H and TP321?

321 stainless steel pipe has a lower carbon content (≤0.08%) and no minimum carbon content requirement. It prioritizes intergranular corrosion resistance but doesn't guarantee high-temperature strength. Therefore, it cannot directly replace TP321H for high-temperature, pressure-containing components compliant with ASME standards.

Specification

Chemical Composition of TP321H (UNS S32109)

Element	Requirement (%)	Notes
Carbon (C)	0.04–0.10	Controlled carbon range for high-temperature stability
Manganese (Mn)	2.00 max
Phosphorus (P)	0.045 max
Sulfur (S)	0.030 max
Silicon (Si)	1.00 max
Chromium (Cr)	17.0–19.0	Provides oxidation resistance
Nickel (Ni)	9.0–12.0	Austenite stabilizer
Titanium (Ti)	4(C+N)–0.70 min	Stabilization against sensitization

Heat Treatment Specifications for TP321H (UNS S32109)

Parameter	Requirement	Notes
Grade	TP321H	Titanium-stabilized austenitic stainless steel
UNS Number	S32109
Heat Treat Type	Solution treatment
Solution Treating Temperature	2000°F [1090°C]	Higher than standard TP321 (1900°F/1040°C)
Cooling Media	Water or other rapid cooling	Prevents carbide precipitation

Mechanical Properties of TP321H (UNS S32109)

Property	Requirement	Notes
Grade	TP321H	Titanium-stabilized austenitic stainless steel
UNS Designation	S32109
Tensile Strength, min	75 ksi [515 MPa]	Matches standard TP321 requirements
Yield Strength, min	30 ksi [205 MPa]	0.2% offset method
Elongation in 2 in. or 50 mm, min	35%	Standard elongation for austenitic grades
Hardness, max	192 HBW/200 HV	Brinell/Vickers hardness
Hardness, max	90 HRB	Rockwell B scale

ASTM A213 Seamless Tube Sizes And Dimensions
ASTM A213 sizes usually furnished to this speciﬁcation are 1/8 inch [3.2 mm] in inside diameter to 5 inch [127 mm] in outside diameter and 0.015 to 0.500 in. [0.4 to 12.7 mm]. Common outside diameter and wall thickness are listed as below, tubing having other diameters may be furnished, provided such tubes comply with all other requirements of this specification.

ASTM A213 Wall Thickness Tolerances
ASTM A213 specifies Minimum wall thickness, namely, there is no mill under tolerance, only overtolerance, unless specified as average wall thickness is required, permissible variations from the specified average wall thickness shall be +/-10 % of the specified average wall thickness for cold-formed tubes.

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Testing and Inspection

ASTM A213 Testing Requirement
Each tube shall be subjected to the nondestructive electric test or hydrostatic test, Manufacturer Material Test Certification as per EN 10204 3.1 should be provided.

Tensile property, Elongation
Hardness testing, Brinell, Rockwell, Vickers hardness
Flattening testing
Flaring testing
Hydrostatic or Nondestructive test
Intergranular Corrosion Test – ASTM A262/E (option)