UNS S32100|1.4541|TP321 Seamless Stainless Steel Pipe

Seamless Stainless Steel TP321 Pipes (UNS S32100 / W.Nr. 1.4541) are high-performance austenitic solutions specifically engineered for superior resistance to intergranular corrosion and oxidation in elevated temperature environments. As a premier manufacturer based in Wenzhou, China, XinZhe produces high-integrity seamless piping that strictly adheres to ASTM A312, ASTM A213, and ASME SA312 international standards.

Distinguished by the strategic addition of Titanium (Ti), our TP321 tubing prevents chromium carbide precipitation during prolonged exposure to temperatures in the 427°C - 816°C (800°F - 1500°F) range. This makes them indispensable for mission-critical applications in heat exchanger tubes, petrochemical refinery infrastructure, and power plant boilers. Through advanced cold-drawing and precise solution annealing, XinZhe ensures every pipe maintains a uniform microstructure and optimized mechanical strength for demanding thermal cycling conditions.

"For applications requiring higher creep resistance at temperatures above 1000°F, we recommend TP321H (UNS S32109) with optimized carbon content."

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What Is Seamless Stainless Steel TP321 Pipe?

Seamless Stainless Steel TP321 Pipe

Titanium-Stabilized Austenitic Alloy for High-Temperature Applications

Product Overview

What is ASTM A312 TP321 Seamless Stainless Steel Pipe?

ASTM A312 TP321 Seamless Stainless Steel Pipe (UNS S32100 / EN 1.4541) is a titanium-stabilized austenitic stainless steel pipe specifically engineered for high-temperature service (427°C–816°C / 800°F–1500°F).

Compared to conventional 304 stainless steel pipes, TP321 contains added titanium (Ti), which effectively stabilizes carbon and prevents chromium carbide precipitation during welding or prolonged exposure to elevated temperatures. This ensures excellent resistance to intergranular corrosion.

Manufactured from a solid billet without welding seams, TP321 seamless pipes provide:

Superior structural integrity
Enhanced pressure resistance
Elimination of weld seam defects

Additional Information

These characteristics make them ideal for critical high-temperature and high-pressure environments.

Key Features and Technical Advantages

1. Outstanding High-Temperature Performance

Continuous service temperature up to 870°C (1600°F)
Excellent oxidation resistance in cyclic heating environments

2. Enhanced Intergranular Corrosion Resistance

Titanium stabilization (Ti ≥ 5×(C+N)) binds carbon as titanium carbides
Prevents sensitization and preserves chromium at grain boundaries

3. Superior Creep and Stress Rupture Strength

Better high-temperature mechanical properties than TP304 / TP304L
Suitable for long-term thermal exposure applications

4. Seamless Pipe Integrity

Uniform wall thickness
Homogeneous grain structure
High reliability under extreme pressure conditions

Technical Specifications

Standards

ASTM A312 / ASME SA312
EN 10216-5 (1.4541)
JIS G3459
GB/T 14976

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for 321 stainless steel.

Table 1: Chemical Composition of Stainless Steel 321

The composition of Stainless Steel 321 is carefully balanced to achieve its superior high-temperature stability and corrosion resistance.

Note: The titanium content must be at least five times the carbon content to ensure stabilization.

Table 2: Typical Mechanical Properties of Stainless Steel 321

Stainless Steel 321 is specifically designed to maintain its strength and shape in high-temperature, high-stress environments.

Table 3: Typical Physical Properties of Stainless Steel 321

These physical properties highlight the material's ability to perform reliably under a wide range of conditions.

Table 4: The Standard of Stainless Steel Seamless Pipe Size Tolerance Size Chart :

Typical Applications of TP321 Seamless Pipes

TP321 stainless steel seamless pipes are widely used in industries requiring heat resistance and corrosion resistance simultaneously:

Aerospace Industry

Jet engine exhaust systems
Collector rings and manifolds

Power & Energy Sector

Boiler tubes
Heat exchangers
Thermal oxidizers

Chemical Processing

High-temperature gas handling systems
Corrosive media pipelines

Oil & Gas & Refining

Furnace components
Expansion joints
High-temperature piping systems

Quality Assurance and Testing

We implement a comprehensive quality control system to ensure compliance with international standards:

Certification

EN 10204 3.1 / 3.2 Mill Test Certificates (MTC)
Full raw material traceability

Non-Destructive Testing (NDT)

100% Ultrasonic Testing (UT)
Eddy Current Testing (ET)
Hydrostatic Pressure Testing

Material Verification

100% PMI (Positive Material Identification)

Specialized Testing

Intergranular Corrosion Test (ASTM A262 Practice E)
Grain Size Analysis
Flattening and Flaring Tests

Third-Party Inspection

Supported by globally recognized agencies:

SGS
Bureau Veritas (BV)
TÜV
Lloyd’s Register (LR)

Tensile Strength	Yield Strength	Elongation	Hardness
≥ 515 MPa	≥ 205 MPa	≥ 35%	≤ 192 HBW

Density	Melting Point	Thermal Expansion	Thermal Conductivity	Modulus of Elasticity	Electrical Resistivity
8.0 g/cm³	1398 - 1454 °C	16.6 µm/m·°C (20-100°C)	16.3 W/m·K (20°C)	193 GPa	0.72 x 10⁻⁶ Ω·m (20°C)

Chemical Composition

Cr	Ni	P	S	Ti	Mn	Si	C
17.00 - 19.00	9.00 - 12.00	≤ 0.045	≤ 0.030	≥ 5×(C+N), ≤0.70	≤ 2.00	≤ 1.00	≤ 0.08

Size Tolerance Chart

Standard	OD(D)	Tolerance （MM)		Thickness(S)	Tolerance(MM)	Length	Tolerance
	MM	Common	High	MM			MM
ASTM A312	D ≤48.3	+0.4/-0.8		10.3 ≤73	+20%-12.5%		+6.0/0
	48.3 ≤114.30	±0.8		88.9 ≤457.2,t/D ≤5%	+22.5%/-12.5%
	114.3 ≤219.1	+1.6/-0.8		88.9 ≤457.2,t/D >5%	+15%/-12.5%
	219.1 ≤457.2	+2.4/-0.8		D ≥508, t/D≤5%,SMLS	+22.5%/-12.5%
	457.2 ≤660.4	+3.2/-0.8		D ≥508, t/D>5%,SMLS	+15%/-12.5%
	660.4 ≤863.6	+4.0/-0.8		D ≥508, WELD	+17.5%/-12.5%
	863.6 ≤1219.2	+4.8/-0.8
JIS 3459 Hot-Finished Smls Pipe	D ＜50	±0.51		S ＜4	±0.5
	D ≥50	±1.0%		S ≥4	±12.5%
JIS 3459 Cold-Finished	D ＜30	±0.3		S ＜2	±0.2
	D ≥30	±1.0%		S ≥2	±10.0%
JIS G3463 Hot-Finished Smls Pipe	100	+0.4/-0.8		D ＜100， S	/	D	+7/0
				D ＜100， 2≤S	+40%/0	D	+10/0
				D ＜100， 2.4≤S	+35%/0
				D ＜100， 3.8≤S	+33%/0
				D ＜100， 4.6≤S	+28%/0	D	+13/0
	100 ≤D	+0.4/-1.2		D>100, S ＜2	/
	120 ≤D			D>100 ， 2≤S	/	D	+15/0
	160 ≤D	+0.4/-1.8		D>100 ， 2.4≤S	+35%/0
	200 ≤D	+0.4/-2.4		D>100 ， 3.8≤S	+33%/0	D>50,7	+10/0
				D>100 ， 4.6≤S	+28%/0
JIS G3463 Cold-finished		+0.4/-0.8		D	+0.4/0
	60 ≤D	±0.3		D ≥2.0	+20%/0	D>50,7	+13/0
	80 ≤D	±0.4		D ≥40	+22%/0
	100 ≤D	+0.4/-0.6
	120 ≤D	+0.4/-0.8				D>50,10M	+15/0
	160 ≤D	+0.4/-1.2
	200 ≤D	+0.4/-1.6
GB/T 14975 冷拔(扎)钢管	D	±0.3	±0.1	所有壁厚，普通级PA	+12.5%/-10%
	12.7		±0.15
	38.1	±0.4	±0.3
	88.9	±0.9%	±0.4
	139.7		±0.8	所有壁厚，高级PC	±10%
	203.2		±1.1
	219.1		±1.6
	D ≥323.9		±0.5%
GB/T 14976 冷拔(轧)钢管	6	±0.2	±0.15	S ≤3	±12%(10% /0 高级PC)
	10 ≤D	±0.2	±0.2
	30 ≤D	±0.2	±0.3	S>3	+12.5%/-10%(10%/0 高级PC)
	50 ≤D	0.85%	0.75%
	D>219	0.9%	0.8%	Smin, all	+22%/0(+20%/0 高级PC)

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Send your Seamless Stainless Steel TP321 Pipe enquiry with grade, applicable ASTM/ASME standard and edition, OD × wall thickness, length, quantity, end finish, delivery destination and inspection documents — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.

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