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Stainless Steel 347 Flat, Square, and Hex Bars are stabilized austenitic stainless steels that offer excellent resistance to intergranular corrosion. They are alloyed with niobium, which enhances their strength and prevents carbide precipitation during welding. Stainless Steel 347 Flat, Square, and Hex Bars are ideal for high-temperature service and are commonly used in chemical, petroleum, and power generation industries. Their superior oxidation resistance and thermal stability make them suitable for continuous exposure to elevated temperatures. These bars combine strength, durability, and corrosion resistance effectively.
The chemical composition of Stainless Steel 347 Flat, Square, and Hex Bars includes chromium, nickel, and columbium (niobium), which together enhance corrosion resistance and mechanical properties. This alloy maintains its strength and toughness even at cryogenic and high temperatures. Stainless Steel 347 Flat, Square, and Hex Bars provide better resistance to sensitization compared to 304 or 321 grades, making them ideal for welded structures. The niobium addition helps stabilize the alloy against intergranular attack. These features ensure longevity in aggressive environments.
Stainless Steel 347 Flat, Square, and Hex Bars exhibit excellent mechanical strength, with high tensile and yield properties suitable for heavy-duty applications. They maintain stability under cyclic thermal conditions and resist deformation under load. The bars demonstrate excellent creep and stress-rupture resistance at temperatures up to 870°C. Stainless Steel 347 Flat, Square, and Hex Bars also show good ductility and toughness, ensuring reliable performance during forming and machining. Their combination of strength and corrosion resistance makes them highly versatile.
These bars offer excellent resistance to oxidation and scaling in continuous service at elevated temperatures. Stainless Steel 347 Flat, Square, and Hex Bars can withstand conditions involving acids, chlorides, and other corrosive chemicals. Their performance is particularly strong in environments containing nitric acid and sulfur-bearing gases. They provide superior resistance compared to non-stabilized grades when exposed to high-temperature and pressure applications. These qualities make them suitable for aerospace and chemical plant components.
Fabrication and welding of Stainless Steel 347 Flat, Square, and Hex Bars are convenient due to their austenitic structure. They can be easily machined, welded, and formed using standard industrial techniques. Post-weld heat treatment is generally not required, thanks to their stabilized composition. Stainless Steel 347 Flat, Square, and Hex Bars can be polished and finished to improve their appearance and resistance to corrosion. They are commonly used for parts requiring precision and long-lasting performance.
Applications of Stainless Steel 347 Flat, Square, and Hex Bars include heat exchangers, furnace components, boiler tubes, and exhaust manifolds. They are also utilized in chemical processing plants, refineries, and food processing industries. These bars provide reliable service in environments where oxidation and intergranular corrosion are concerns. Stainless Steel 347 Flat, Square, and Hex Bars are preferred in situations involving both high temperatures and corrosive chemicals. Their versatility allows use across multiple industrial sectors.
In conclusion, Stainless Steel 347 Flat, Square, and Hex Bars are an excellent choice for demanding environments requiring heat and corrosion resistance. Their stabilized composition ensures consistent performance during welding and high-temperature exposure. Stainless Steel 347 Flat, Square, and Hex Bars deliver a superior balance of mechanical strength, workability, and oxidation resistance. They are suitable for structural, mechanical, and chemical applications alike. Overall, these bars offer long-lasting durability and outstanding operational reliability.
Specification Table
| Property | Specification |
|---|---|
| Grade | 347 |
| Standard | AISI, ASTM, ASME |
| Type | Flat Square Hex |
| Form | Hex Bar / Flat Hex Bar |
| Material | Stainless Steel |
| Finish | Hot Rolled / Cold Drawn / Polished |
| Length | Customizable (Standard: 1m - 6m) |
| Width / Flats | Custom Sizes Available |
| Application | Construction, Industrial Equipment, Aerospace, Automotive |
| Certification | ISO 9001, ASTM, EN Standards |
Chemical Composition (Typical ranges for SS347)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.03 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 13.0 |
| Niobium (Nb + Ta) | 10×C min (approx. 0.5 – 1.0) |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 515 – 827 |
| Yield Strength (MPa) | 205 – 275 |
| Elongation (%) | 40 min |
| Hardness (Brinell) | 150 – 200 |
| Modulus of Elasticity (GPa) | 193 |
| Density (g/cm³) | 8.0 |
| Melting Point (°C) | 1420 – 1450 |
| Operating Temperature | Up to 870°C (1600°F) |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| AISI / ASTM | 347, 347H, 347J |
| EN (Europe) | X6CrNiNb17-12 |
| JIS (Japan) | SUS 347 |
| DIN (Germany) | 1.4550, 1.4551 |
| BS (UK) | 347S11 |
| AFNOR (France) | Z7CNDU18-12 |
| ISO | 347 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Across Flats (mm) | Width (mm) | Thickness (mm) | Weight (kg/m) |
|---|---|---|---|
| 6 | 6 | 6 | 0.22 |
| 8 | 8 | 8 | 0.39 |
| 10 | 10 | 10 | 0.61 |
| 12 | 12 | 12 | 0.88 |
| 16 | 16 | 16 | 1.57 |
| 20 | 20 | 20 | 2.45 |
| 25 | 25 | 25 | 3.85 |
| 30 | 30 | 30 | 5.53 |
| 35 | 35 | 35 | 7.52 |
| 40 | 40 | 40 | 9.80 |
Types Of Stainless Steel 347 Flat Square Hexs and Tubes
Stainless Steel Flat Hex
Monel 400 Flat Hex
Inconel 600 Flat Hex
Hastelloy Flat Hex
super Duplex Flat Hex
Duplex Flat Hex
Monel K500 Flat Hex
Nickel Flat Hex
Frequently Asked Questions (FAQ)
What is Stainless Steel 347 Flat Square Hex?
Stainless Steel 347 Flat Square Hex is a stabilized austenitic stainless steel bar with niobium added to improve resistance to intergranular corrosion. It is commonly used in high-temperature applications and industrial equipment.
What are the standard sizes available?
SS 347 Flat Square Hex bars are available in various sizes typically ranging from 6mm to 40mm across flats, with lengths customizable between 1m to 6m depending on supplier.
What are the key applications?
It is widely used in aerospace, chemical processing, oil & gas, power generation, automotive, and industrial machinery where corrosion resistance and high temperature strength are essential.
What is the chemical composition?
Major elements include Chromium (17-19%), Nickel (9-13%), Carbon (0.08% max), Manganese (2% max), Silicon (1% max), Niobium (stabilizing), and Iron balance.
What are the mechanical properties?
Typical mechanical properties include tensile strength of 515-827 MPa, yield strength of 205-275 MPa, elongation ≥ 40%, Brinell hardness 150-200, and high-temperature operating capability up to 870°C.
What are equivalent grades?
Equivalent grades include ASTM 347H/347J, EN X6CrNiNb17-12, JIS SUS 347, DIN 1.4550/1.4551, BS 347S11, AFNOR Z7CNDU18-12, ISO 347.
Flats Square Hexs Supplier
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Flats Square Hexs Exporter
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