Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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Yuhong Special Steel has been engaged in austenitic stainless steel and nickel alloy steel (Hastelloy, Monel, Inconel, Inkoloy) seamless welded pipes and pipes for more than 25 years, and steel pipes are sold every year. Over 80,000 tons. Our customers have covered more than 45 countries including Italy, Britain, Germany, the United States, Canada, Chile, Colombia, Saudi Arabia, South Korea, Poland, Singapore, Australia, France, etc.
ASTM A312 Gr Tp347h is an austenitic stainless steel. It contains chromium and nickel, making it corrosion-resistant. To increase toughness, the A312 347h material has a higher carbon content. Adding more carbon results in toughness, but also less strength than low carbon versions of the same material. But to overcome this problem, columbium was added to the A312 Tp347h material. The alloy composition makes the material resistant to most oxidizing agents. SA 312 Tp 347h material has excellent resistance to intergranular corrosion regardless of carbon content. This makes 347h stainless steel pipe suitable for applications operating at high temperatures and with a high risk of oxidation. SS 347H seamless pipe material is cold drawn and therefore cannot be hardened by heat treatment. But it can be hardened by cold work. The material can also be easily welded.
ASTM A213 TP347H Stainless Steel Seamless Tube Chemical Composition
| Grade | 347 | 347H | 347HFG |
| UNS Designation | S34700 | S34709 | S34710 |
| Carbon (C) Max. | 0.08 | 0.04–0.10 | 0.06–0.10 |
| Manganese (Mn) Max. | 2 | 2 | 2 |
| Phosphorous (P) Max. | 0.04 | 0.04 | 0.04 |
| Sulphur (S) Max. | 0.03 | 0.03 | 0.03 |
| Silicon (Si) Max. | 0.75 | 0.75 | 0.75 |
| Chromium (Cr) | 17.0–20.0 | 17.0–20.0 | 17.0–20.0 |
| Nickel (Ni) | 9.0–13.0 | 9.0–13.0 | 9.0–13.0 |
| Molybdenum (Mo) | — | — | |
| Nitrogen (N) | — | — | — |
| Iron (Fe) | Bal. | Bal. | Bal. |
| Other Elements | Cb+Ta=10xC-1.0 | Cb+Ta=8xC-1.0 | Nb+Ta=8xC-1.0 |
ASTM A213 TP347H Stainless Steel Seamless Tube Physical Properties
| In the Annealed Condition at -20°F to +100°F | |||||
| Alloy | UNS Design | Density kg/dm³ | Modulus of Elasticity (x106 psi) | Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6) | Thermal Conductivity (BTU-in/ft2-h-°F) |
| 347 | S34700 | 7.98 | 29 | 9.2 | — |
| 347H | S34709 | 7.98 | 29 | 9.2 | — |
| 347HFG | S34710 | — | 29 | 9.2 | — |
ASTM A213 TP347H Stainless Steel Seamless Tube Mechanical Properties
| In the Annealed Condition at -20°F to +100°F | |||||||||
| Tensile Strength | Tensile Strength | Yield Strength | Yield Strength | ||||||
| Alloy | UNS | Spec | MPa | ksi | MPa | ksi | Elongation in 2 inches (min.) % | Grain Size Req. | Harndess HBW |
| 347 | S34700 | ASTM A213 | 515 | 75 | 205 | 30 | 35 | — | 192 |
| 347H | S34709 | ASME SA 213 | 515 | 75 | 205 | 30 | 35 | 7 or coarser | 192 |
| 347HFG | S34710 | — | 550 | 80 | 205 | 30 | 35 | 7 or coarser | 192 |
Why is 347h SS used for chemical processing?
Grade 347 is a special austenitic stainless steel that can be repeatedly and intermittently exposed to temperatures above 800 degrees Celsius. These are improvements over 304 stainless steel. They are similar to grade 321 in some mechanical properties, but differ in that they contain columbium in the composition. The material is resistant to most aggressive media at medium and high temperatures.
This is an important aspect required for chemical processing. The material has a minimum yield strength of 205MPa and a minimum tensile strength of 515MPa. This enables the material to withstand high temperature pressures above 850 degrees Celsius. Tubes and components also have good elongation and high hardness. 304 material can undergo intergranular corrosion at temperatures above 850 F. 347H has higher carbon content and heat resistance, so it can work in this temperature range.
The combination of pressure capacity, strength, hardness, heat resistance and corrosion resistance makes it suitable for chemical processing. These properties also make the material useful in other highly corrosive, high heat applications such as boiler tubes and casings, radiant superheaters, heat exchanger tubes, oil and gas refineries, and aircraft exhaust stacks.
ASTM A213 TP347H Stainless Steel Seamless Pipe Application Industry
Material Grade:
| American Standard | Austenitic Steel: TP304, TP304L, TP304H, TP304N, TP310S, TP316, TP316L, TP316Ti, TP316H, TP317, TP317L, TP321, TP321H, TP347, TP347H, 904L… Duplex Steel : S31803, S32101, S32205, S32304, S32750, S32760 Others: TP405, TP409, TP410, TP430, TP439,... |
| Europen Standard | 1.4162, 1.4301, 1.4307,1.4362, 1.4401, 1.4404, 1.4410, 1.4438, 1.4462, 1.4501, 1.4539, 1.4541, 1.4550, 1.4571, 1.4841, 1.4845,1.4878, 1.4948, |
| GOST Standard | 08Х17Т, 08Х13, 12Х13, 12Х17, 15Х25Т, 04Х18Н10, 08Х20Н14С2, 08Х18Н12Б, 10Х17Н13М2Т, 10Х23Н18, 08Х18Н10, 08Х18Н10Т, 08Х18Н12Т, 08Х17Н15М3Т, 12Х18Н10Т, 12Х18Н12Т, 12Х18Н9, 17Х18Н9, 08Х22Н6Т, 06ХН28МДТ |
Size Range:
| Production | Outside Diameter | Wall Thickness |
| Seamless Pipe | 6.00mm-830mm | 0.5mm-48mm |
Stainless Steel Seamless Pipe: ASTM A312/A312-10a, TP304H, TP310H, TP316H, TP321H, TP347H With Random Length
Size: DN15, DN25, DN30, DN 40, DN 50, DN 80, DN 100, DN 150, DN200, DN250, DN300, DN350, DN400, DN500, DN600
ANSI B16.10: B16.19, SCH 5S, SCH 10S, SCH 20, SCH 30, SCH 40S, SCH 60, SCH80S, SCH 100, SCH 120, SCH160, XS, XXS
