Product Details

Product Description

SA213TP321H

Seamless ferritic and austenitic alloy steel boiler, superheater, and heat exchanger tubes.

SA213 AISI 321 UNS N32100 EN 10216 - 5 1.4541 is a stabilized stainless steel which offers as its main advantage an excellent resistance to intergranular corrosion following exposure to temperature in the chromium carbide precipitation range from 800 to 1500°F (427 to 816°C). Alloy 321 stainless steel tubing is stabilized against chromium carbide formation by the addition of titanium.

Hysical Properties of TP321 Stainless Steel Pipe in the Annealed Condition at -20°F to +100°F according to ASTM A213

			Tensile Strength		Yield Strength
Alloy	UNS	Spec	MPa	ksi	MPa	ksi	Elongation in 2 inches (min.) %	Grain Size Req.	Maximum Harndess	Modulus of Elasticity (x106 psi)	Mean Coefficient of Thermal Expansion (IN./IN./ °F x 10-6)	Thermal Conductivity (BTU-in/ft2-h-°F)
321	S32100	—	515	—	205	—	35	—	—	29.0	9.2	—
321H	S32109	—	515	—	205	—	35	7 or coarser	—	29.0	9.2	—

321 321H Stainless Steel Density Specific Gravity: 7.93 (kg/m3)

ASME SA 213 TP321 stainless steel chemical composition

Grade	TP321	TP321H
UNS Designation	S32100	S32109
Carbon (C) Max.	0.08	0.04–0.10
Manganese (Mn) Max.	2.00	2.00
Phosphorous (P) Max.	0.045	0.045
Sulphur (S) Max.	0.03	0.03
Silicon (Si) Max.	1.00	1.00
Chromium (Cr)	17.0–20.0	17.0–20.0
Nickel (Ni)	9.0–12.0	9.0–12.0
Molybdenum (Mo)	—	—
Nitrogen (N)	-	-
Iron (Fe)	Bal.	Bal.
Other Elements	Ti=5(C+N) to 0.70%	Ti=4(C+N) to 0.70%

TP321 Stainless Steel Pipe Range

Alloy	UNS Designation	Werkstoff NR.	Specifications*
321	S32100	EN 10216 - 5 1.4541	A269, A/SA249, A/SA312
321H	S32109	—	A/SA249, A/SA312

TP321 Stainless Steel Pipe Typical Properties in the Annealed Condition

The properties quoted in this publication are typical of mill products. Unless otherwise indicated they should not be regarded as guaranteed minimum values for specification purposes.

TP321 Stainless Steel Tube Recommended Maximum Service Temperature
(Oxidising Conditions)

Continuous Service 950oC
Intermittent Service 870oC

TP321 Stainless Steel Pipe Thermal Processing
1.    Annealing Heat  from 1050 to 1150oC and cool in air. This ensures maximum ductility of the steel.
2.    Stress Relieving 321 can be stress-relief annealed within the sensitization temperature range
       450-800oC without carbide precipitation occurring, thus avoiding the possibility of intergranular corrosion.
3.     Hot working
        Initial forging and pressing temperature: 1150 - 1250oC
        Finishing temperature: 950oC

TP321 Stainless Steel Tubing Corrosion Resistance

Equivalent to Grade 304 in the annealed condition, and superior if a weldment in these grades has not been post-weld annealed or if the application involves service in the 425-900°C range. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C. Considered resistant to potable water with up to about 200mg/L chlorides at ambient temperatures, reducing to about 150mg/L at 60°C.

TP321 Stainless Steel Tube Heat Resistance

Good oxidation resistance in intermittent service to 900°C and in continuous service to 925°C. These grades perform well in the 425-900°C range, and particularly where subsequent aqueous corrosive conditions are present. 321H has higher hot strength, and is particularly suitable for high temperature structural applications.

TP321 Stainless Steel Pipe Heat Treatment

Solution Treatment (Annealing) - heat to 950-1120°C and cool rapidly for maximum corrosion resistance.

Stabilising - heat to 870-900°C for 1 hour per 25mm of thickness and air cool. Stabilisation is recommended for most severe service conditions (above 425°C) and particularly for material annealed at the upper side of the annealing temperature range.

Stress Relief - Heat to 700°C for 1 to 2 hours and air cool.

These grades cannot be hardened by thermal treatment.

TP321 Stainless Steel Pipe Welding

Excellent weldability by all standard fusion methods, both with and without filler metals. AS 1554.6 pre-qualifies welding of 321 and 347 with Grade 347 rods or electrodes; high silicon version of 347 is also pre-qualified for welding of 321.