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 a coarse grain stainless steel. It is widely used for the superheater and reheater tube in USC (ultra-supercritica) coal boilers. It is also used in high temperature operation.
SA213 TP347H Stainless Steel is a stabilized austenitic stainless steel known for its excellent resistance to intergranular corrosion due to the addition of niobium (columbium). It is often used in applications involving high temperatures and is suitable for welded components that cannot undergo solution annealing after fabrication.
The SA213 TP347H stainless steel can be annealed at temperatures ranging from 1010 to 1193°C (1850 to 2000°F) and then quenched with water.
SA213 specification includes several austenitic stainless steel grades, known for their corrosion resistance and strength:
SA213 also includes various ferritic and martensitic alloy steel grades, known for their high-temperature strength:
In addition to the standard grades, SA213 also offers special alloy grades for specific applications:
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SA213 TP347H is a high-carbon version of the austenitic stainless steel grade TP347. It is stabilized with columbium (niobium) to enhance its resistance to intergranular corrosion. The higher carbon content improves its high-temperature strength, making it suitable for applications in boilers, superheaters, and heat exchangers.
Typical mechanical properties of TP347H stainless steel include:
SA213 TP347H can be welded using standard techniques like TIG, MIG, and SAW. It is important to use filler materials that match the grade to maintain the properties of the base material. Preheating and post-weld heat treatment are generally not required.
The primary advantage of using TP347H is its resistance to high-temperature degradation, including oxidation and intergranular corrosion. This makes it ideal for environments where temperatures exceed 1000°F (537°C).
SA213 TP347 / 347H is a seamless ferritic and austenitic alloy SS (Stainless Steel) boiler tube used in superheaters, and heat exchanger tubes.
TP347H is a stabilized austenitic stainless steel that is used in reheaters, heat exchangers, and superheaters. It is a corrosion-resistant material with a high creep strength. The high carbon content of TP347H gives it extra toughness. The chemical composition of TP347H includes: Silicon, Chromium, Nickel, Columbium +Tantalum.
TP347H has been used as the material of tubes in 600°C USC power plants in China. It can be easily elongated by 40%.
347H is the higher carbon version of 347 plate. Due to the additional carbon present in 347H plate, it is tougher and generally more durable than 347 plate. These grades of stainless steel plate is available in a wide range of sizes at Penn Stainless Products.
This grade of stainless steel has an elongation of 40%. On the Brinell hardness scale 347 and 347H stainless steel plate has hardness of 201 and on the Rockwell B scale, both 347 and 347H have a hardness of 95.
Both contain between 17.0% and 20.0% chromium, and no more than 2.0% manganese. They are made of between 9.0% and 13.0% nickel. 347 stainless steel plate contains at most 0.04% phosphorous while 347H stainless steel can only contain up to 0.03% phosphorous.
| 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 | . | . | . . | ||
| Grade | UNS | Heat Treat Type | Austenitizing/ Solutioning Temperature, min or range °F [°C] | Cooling Media | ASTM Grain Size No. B |
|---|---|---|---|---|---|
| Designation | |||||
| 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 |
| 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 |
Positive Material Identification (PMI) testing for TP347H involves the analysis of the chemical composition of the material to verify its alloy content and ensure it meets the required specifications.
TP347H is a high-temperature stainless steel alloy often used in applications like boiler tubes and heat exchangers. PMI testing is crucial to confirm that the material is indeed TP347H and that it meets the necessary alloy composition standards.
| Grade | UNS No | Euronorm | |
|---|---|---|---|
| No | |||
| 347H | S34709 | 1.4961 | |
| 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 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 tests shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot.
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.
347 and 316 stainless steel both fall into the 300-series family and are known for their stability. While 316 is a standard alloy that offers superior weldability, 347 offers superior corrosion resistance and mechanical strength.
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.
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:
Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.
Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.
Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.
The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.
Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.
