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Stainless Steel 309 Flat, Square, and Hex Bars are austenitic stainless steels designed for superior resistance to oxidation and high-temperature corrosion. With higher chromium and nickel content compared to 304, they deliver excellent strength and durability even under extreme heat conditions. Stainless Steel 309 Flat, Square, and Hex Bars are ideal for furnace parts, heat exchangers, and thermal processing equipment. They maintain structural stability during continuous exposure to elevated temperatures. These bars offer a balance of toughness, corrosion resistance, and workability for demanding environments.

The chemical composition of Stainless Steel 309 Flat, Square, and Hex Bars includes approximately 23% chromium and 13% nickel, which enhance resistance to oxidation and sulfidation. The alloy is stable in both oxidizing and reducing atmospheres, ensuring long-lasting performance. Stainless Steel 309 Flat, Square, and Hex Bars resist corrosion in acidic, humid, and chloride-rich environments. Their chemical makeup allows them to handle fluctuating temperatures without scaling or distortion. These properties make them suitable for high-heat industrial applications.

Stainless Steel 309 Flat, Square, and Hex Bars exhibit impressive mechanical properties, including high tensile and yield strength. They retain their strength and hardness at elevated temperatures while maintaining good ductility and toughness. The alloy’s austenitic structure ensures resistance to thermal fatigue and deformation. Stainless Steel 309 Flat, Square, and Hex Bars perform exceptionally well under mechanical stress and high heat exposure. Their strong mechanical profile makes them a reliable choice for fabrication and heavy-duty engineering.

One of the key advantages of Stainless Steel 309 Flat, Square, and Hex Bars is their excellent resistance to oxidation and scaling up to 1000°C in continuous service. They also resist carburization, making them suitable for furnace and petrochemical applications. Stainless Steel 309 Flat, Square, and Hex Bars maintain a clean surface finish even in high-temperature environments. Their superior resistance to thermal cracking ensures durability under thermal cycling. These features make them a preferred material for heat-intensive operations.

Stainless Steel 309 Flat Square Hexs and Tubes

Fabrication and welding of Stainless Steel 309 Flat, Square, and Hex Bars are straightforward due to their excellent formability and weldability. They can be welded using TIG, MIG, or conventional methods without significant risk of carbide precipitation. Post-weld annealing is generally not required, which simplifies fabrication. Stainless Steel 309 Flat, Square, and Hex Bars can also be machined and polished to achieve a smooth, corrosion-resistant surface. Their high formability supports a wide range of custom manufacturing applications.

Applications of Stainless Steel 309 Flat, Square, and Hex Bars include chemical processing equipment, furnace linings, oil refinery units, jet engine components, and heat exchanger systems. They are also widely used in power generation and marine industries where heat and corrosion resistance are essential. Stainless Steel 309 Flat, Square, and Hex Bars provide consistent performance under extreme thermal and chemical exposure. Their combination of strength and corrosion resistance ensures a long service life in industrial applications.

In conclusion, Stainless Steel 309 Flat, Square, and Hex Bars are highly reliable materials for high-temperature and corrosive environments. Their high chromium-nickel composition delivers exceptional oxidation resistance and mechanical strength. Stainless Steel 309 Flat, Square, and Hex Bars are easy to fabricate, weld, and maintain, making them suitable for a wide range of industries. Their long-term stability under heat and stress ensures dependable performance. Overall, these bars offer durability, versatility, and superior resistance for demanding engineering applications

Specification Table

Property Specification / Value
Material Grade SS 309 / SS 309S
Form Flat Square Hex
Standard ASTM A276 / A479, ASME SB 276 / SB 479
Finish Hot Rolled / Cold Rolled / Polished
Size Range Flat: 5mm – 200mm, Square: 6mm – 150mm, Hex: 8mm – 100mm
Length 1m – 6m (Custom Length Available)
Surface Finish Mill Finish / Brushed / Mirror Polished
Applications Furnace Parts, Heat Exchangers, Chemical Equipment, Boiler Components, Industrial Machinery
Corrosion Resistance Excellent in Oxidizing Environments
Temperature Resistance Up to 1100°C Continuous / 1400°C Intermittent

Chemical Composition (Typical ranges for SS309)

Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.

Element Composition (%)
Carbon (C) ≤ 0.20
Chromium (Cr) 22 – 24
Nickel (Ni) 12 – 15
Manganese (Mn) ≤ 2.0
Silicon (Si) ≤ 1.5
Phosphorus (P) ≤ 0.045
Sulfur (S) ≤ 0.03
Iron (Fe) Balance

Mechanical Properties (Typical)

Property Value
Tensile Strength (MPa) 515 – 740
Yield Strength (MPa) 205 – 310
Elongation (%) 40 (min)
Hardness (Brinell, HB) 150 – 200
Modulus of Elasticity (GPa) 193
Density (g/cm³) 7.90
Melting Point (°C) 1400 – 1450

Equivalent Grades

Standard Equivalent Grade
AISI / SAE 309 / 309S
ASTM A276 / A479
EN / DIN 1.4828 / X15CrNiSi25-20
JIS SUS 309S
GB / China Cr20Ni12 / 0Cr23Ni13
UNS S30900 / S30908
EN ISO H309 / X12CrNiSi25-20

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.

Type Size (mm) Weight (kg/m)
Flat Bar 25 x 3 0.59
40 x 5 1.57
50 x 6 2.35
75 x 10 5.89
100 x 12 9.42
Square Bar 10 x 10 0.79
20 x 20 3.16
25 x 25 4.94
40 x 40 12.64
50 x 50 19.74
Hex Bar 10 0.68
20 2.71
25 4.23
30 6.10
40 10.85

Types Of Stainless Steel 309 Flat Square Hexs and Tubes

Seamless Flat

Stainless Steel Flat Hex

Welded Flat

Monel 400 Flat Hex

ERW Flat

Inconel 600 Flat Hex

EFW Flat

Hastelloy Flat Hex

Seamless Tube

super Duplex Flat Hex

Welded Tube

Duplex Flat Hex

Capillary Tube

Monel K500 Flat Hex

Heat Exchanger Tubes

Nickel Flat Hex

Frequently Asked Questions (FAQ)

What is Stainless Steel 309 Flat Square Hex?

Stainless Steel 309 Flat Square Hex is a high-chromium, nickel-containing austenitic stainless steel available in flat, square, and hexagonal shapes. It offers excellent corrosion and heat resistance for industrial applications.

What are the standard sizes available?

Flat bars: 5mm – 200mm width, Square bars: 6mm – 150mm, Hex bars: 8mm – 100mm. Custom sizes and lengths are also available on request.

What are the main applications of SS 309 Flat Square Hex?

It is widely used in furnace parts, heat exchangers, boiler components, chemical equipment, and industrial machinery due to its high-temperature strength and oxidation resistance.

What is the temperature resistance of SS 309?

Continuous operating temperature up to 1100°C and intermittent exposure up to 1400°C, making it ideal for high-temperature applications.

How is SS 309 different from SS 304?

SS 309 has higher chromium (22–24%) and nickel (12–15%) content compared to SS 304, giving it superior heat and oxidation resistance for high-temperature applications.

Flats Square Hexs Supplier

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Flats Square Hexs Exporter

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