What is the equivalent of AISI 347 stainless steel?
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What is 347 stainless steel?
347 alloy is a chromium-nickel stainless steel modified with the addition of niobium and tantalum, exhibiting excellent resistance to intergranular corrosion. Type 347 stainless steel is also used in heavy-duty welded components where post-weld annealing is not possible, or in applications operating at temperatures ranging from 800° to 1500°F (approximately 427° to 816°C). The overall corrosion resistance of Type 347 stainless steel is approximately the same as that of Type 304 stainless steel.
347 alloy is commonly used in harsh corrosive environments, such as aircraft exhaust pipes, manifolds, and ring collectors.
What is the equivalent of AISI 347 stainless steel?
UNS: S34700
ASTM: ASTM 347, ASTM A182, A240, etc. (various product forms)
DIN (European): 1.4550 (X6CrNiNb18-10)
JIS (Japanese): SUS 347
SAE: SAE 30347
BS (British): 347 S 17, BS En. 58 F, BS En. 58 G
What is the AMS 5646 347 material properties ?
AMS 5646 is a type 347 stainless steel, a niobium-stabilized austenitic alloy commonly used in demanding aerospace environments (such as exhaust systems and manifolds). Key characteristics include: 17-19% chromium, 9-12% nickel, niobium at least 10 times the carbon content (as a stabilizer), high strength (e.g., tensile strength of 75-100 ksi after solution treatment), good oxidation resistance, and non-magnetic properties, and it is resistant to carbide precipitation in the temperature range of 800-1500°F (427-816°C).
AISI 347 stainless steel Chemical Composition Limits
| Weight% | C | P | Si | Ni | Mn | S | Cr | Cb + Ta | Fe | Co | Mo | Cu |
| 347 | 0.08 max | 0.040 max | 1.00 max | 9-12 | 2.0 max | 0.030 max | 17-19 | 10 x C min | Bal | 1.00 max only AMS 5646 |
0.75 max | 0.75 max |
| 347H | 0.04-0.10 | 0.040 max | 1.00 max | 9-12 | 2.0 max | 0.030 max | 17-19 | 10 x C min | Bal |
AISI 347 stainless steel Mechanical Properties
| Mechanical and physical properties | ||
|---|---|---|
| Tensile strength | Rm | 510 - 740 MPa |
| The yield point | Rp0.2 | ≥ 205 MPa |
| Hardness | ≤ 230 HB | |
| Modulus of elasticity | E | 200 GPa |
| Elongation | A | ≥ 40% |
| Density | ρ | 7,90 kg/dm³ |
| Thermal capacity | cp20℃ | 500 J ⋅ kg⁻¹ ⋅ K⁻¹ |
| Thermal conductivity | λ | 15 W ⋅ m⁻¹ ⋅ K⁻¹ |
| Supersaturation | 1020 - 1100℃ | |
What temperature is annealing 347H?
Annealing. Grade 347H stainless steel can be annealed at temperature ranging from 1010 to 1193°C (1850 to 2000°F) and then quenched with water.
What is the difference between 347 and 347H?
Grade 347H contains more carbon (between 0.04% to 0.1%) than regular 347 (≥ 0.08%), which improves the creep properties and strength at temperatures above 1000°F. While it excels in high-temperature conditions, Grade 347 stainless steel plate also demonstrates excellent toughness in cryogenic temperatures.
What is the difference between SS 304 and SS 347?
The main difference is that SS 347 is a stabilized version of SS 304, achieved by adding niobium (columbium), which gives it superior resistance to sensitization and better performance at high temperatures (above 800°F/427°C) by preventing carbide precipitation, making 347 ideal for welding and extreme heat, while 304 is the standard, more economical choice for general-purpose use in milder conditions.
What are the differences between SS 316 and SS 347?
SS 316 (AISI 316 / 1.4401) is a molybdenum-containing austenitic stainless steel designed to provide superior corrosion resistance in chloride-rich and acidic environments. In contrast, SS 347 (AISI 347 / 1.4550) is a niobium-stabilized austenitic stainless steel containing 17-19% chromium and 9-13% nickel, but without molybdenum. Instead, it contains 0.8-1.0% niobium to prevent intergranular corrosion during welding or high-temperature applications. In terms of mechanical properties, SS 316 typically has a tensile strength of 515-720 MPa, while SS 347 has a similar tensile strength to SS 316 but is more suitable for high-temperature applications such as furnace tubes, superheater tubes, and welded pressure vessels.
GNEE currently has SUS 347 (UNS S34700) products in stock, including: plates, sheets, coils, strips, tubes, bars, and wires. In addition, we offer a variety of surface finishes for you to choose from, such as: No.1, 2B, 2D, BA, No.3, No.4, HL, No.8, sandblasting, etc.
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