SA213 TP347H Stainless Steel

SA213 TP347H Stainless Steel is a type of austenitic stainless steel that contains high levels of chromium, nickel, and molybdenum.

It is a modified version of SA213 TP347 with the addition of higher carbon content and an increased amount of niobium. This modification improves the high-temperature strength and corrosion resistance of the steel.

SA213 TP347H is commonly used in high-temperature applications such as chemical processing, petrochemical processing, and power generation. It is also used in heat exchangers, boilers, and other equipment that requires resistance to high temperatures and corrosive environments. The high-temperature strength and oxidation resistance of SA213 TP347H make it a popular choice for these applications.

Chemical Composition - SA213 TP347H Stainless Steel

Grade UNS Composition, %
Design C Mn P S Si Cr Ni Mb Ti Nb N Cu Ce B Al
TP347 S34700 0.08 2 0.045 0.03 1 17.0–19 9.0–13 . . . . . . See Spec . .
TP347H S34709 0.04 – 0.1 2 0.045 0.03 1 17.0–19 9.0–13 . . . . . . See Spec . . . .

Heat Treatment Requirements-SA213 TP347H Stainless Steel

Grade UNS Heat Treat Type Austenitizing/ Solutioning Temperature, min or range °F [°C] Cooling Media ASTM Grain Size No. B
TP347 S34700 Solution treatment 1900 °F [1040 °C] water or another rapid cool . . .
TP347H S34709 Solution treatment cold worked:2000 water or another rapid cool 7
[1100] hot rolled: 1925 [1050]H

Tensile Requirements-SA213 TP347H Stainless Steel

Grade UNS Tensile Strength, Min ksi [MPa] Yield strength, min ksi [MPa] Elongation in 2 in. or 50 mm, min, %A, B Hardness, Max
Designation Brinell/Vickers Rockwell
TP347 S34700 75 [515] 30 [205] 35 192HBW/200Hv 90HB
TP347H S34709 75 [515] 30 [205] 35 192HBW/200Hv 90HB

ASTM A213 SS 347H Equivalent

Grade UNS No Euronorm
347H S34709 1.4961

SS 347H Tube ASTM A213 Tolerances

Specification Allowable Outside Diameter Variation in mm Allowable Wall Thickness Variation Exact Length Tolerance in mm Testing
Nominal Diameter Over Under %Over %Under Over Under
ASTM-A213 TP347H
Seamless Boiler
Superheater and 
Heat Exchanger Tubes
Under 25.4 .1016 .1016 +20 -0 3.175 0 Flattening Test
25.4-38.1 incl .1524 .1524 +22 -0 3.175 0 Tension Test
38.1-50.8 excl .2032 .2032 +22 -0 3.176 0 Flare Test
50.8-63.5 excl .254 .254 +2 -0 4.46 0 Hardness Test
63.5-76.2 excl .347H8 .347H8 +22 -0 4.76 0 100% Hydrostatic test
76.2-101.6 incl .381 .381 +22 -0 4.76 0 Refer to ASTM A-450

Flattening Test

Flattening tests shall be made on specimens from each end of one finished tube, not the one used for the flaring test, from each lot.

Flaring Test

Flaring tests shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot.

Hydrostatic and Nondestructive Testing

Each TP347H Stainless Steel Seamless pipe shall be subjected to the nondestructive electric test or the hydrostatic test. The type of test to be used shall be at the manufacturer’s option unless otherwise specified in the purchase order.


Markings will adhere to prescribed specifications in A999/A999M. They shall include the NPS or OD and schedule number or average wall thickness, heat number, and NH (when hydro testing is not performed) and ET (when eddy-current testing is performed) or UT (when ultrasonic testing is performed). The marking shall also include the manufacturer’s private identifying mark, the marking requirement of section 12.3 on Hydrostatic or Nondestructive Electric Test, if applicable, and whether seamless (SML), welded (WLD), or heavily cold-worked (HCW). For Grades TP347 and TP347H Stainless Tubes, the marking shall also include the heat number and heat-treatment lot identification.


SA213 TP347/ TP347H Stainless tubes Applications Industry

ASTM A213 TP347H is a high-temperature resistant austenitic stainless steel that is commonly used in applications where high temperatures and corrosive environments are present. Some of the common applications of ASTM A213 TP347H include:

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