How does the corrosion resistance of stainless steel 309 / 309S furnace tubes compare to other stainless steel alloys?
The corrosion resistance of Stainless Steel 309/309S Furnace Tubes is generally comparable to other stainless steel alloys commonly used in similar applications. These alloys are designed to exhibit excellent resistance to oxidation, scaling, and corrosion in high-temperature environments. Stainless steel 309 and 309S contain a high chromium and nickel content, contributing to their corrosion resistance properties. The chromium forms a protective oxide layer on the surface, known as the passive layer, which acts as a barrier against corrosive agents. Additionally, a significant amount of nickel enhances the resistance to various corrosive environments, including acids, alkalis, and chloride-containing solutions.

Compared to lower alloyed stainless steels like 304 or 316, stainless steel 309/309S furnace tubes demonstrate superior resistance to high-temperature oxidation and carburization. Their higher chromium and nickel content provides enhanced protection against the formation of harmful oxides and carbides at elevated temperatures. However, it is important to note that the corrosion resistance of stainless steel 309/309S furnace tubes can vary depending on the specific operating conditions, such as temperature, chemical environment, and exposure duration.

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Stainless Steel 309S Furnace Tube, Stainless Steel 309 Furnace Tubes, SS 309S Furnace Tubes, SS 309 Furnace Tube, 309S Stainless Steel Furnace Tube, SS 309 Furnace Tubing, Stainless Steel 309S Furnace Tubes Supplier In Mumbai, India.

What are the key properties and characteristics of stainless steel 309 / 309S furnace tubes?
Stainless Steel 309 Furnace Tubes possess several key properties and characteristics that make them suitable for high-temperature applications. These tubes exhibit excellent heat resistance, maintaining their structural integrity and mechanical properties even at elevated temperatures. They have a high chromium and nickel content, which imparts good resistance to oxidation, scaling, and corrosion in challenging environments. Stainless steel 309 furnace tubes also offer superior strength and toughness, allowing them to withstand thermal cycling and mechanical stresses.

Stainless Steel 309S Furnace Tubes possess several key properties and characteristics that make them suitable for high-temperature applications. These tubes are a low-carbon variant of stainless steel 309, which enhances their resistance to sensitization and intergranular corrosion. They exhibit excellent heat resistance, maintaining their structural integrity and mechanical properties even at elevated temperatures. Stainless steel 309S furnace tubes have high chromium and nickel content, providing good oxidation, scaling, and corrosion resistance in challenging environments. They also offer superior weldability, facilitating ease of fabrication and installation.

Specification Of 309 Stainless Steel Furnace Tubes

Specifications ASTM, ASME, AISI
Outer Diameters 6mm – 300 mm OD
Thickness 1.0mm to 40mm
Length 5.8m, 6, Custom Lengths
Finish Annealed & Pickled, Bright Annealing, Polished
Test Certificate EN 10204 3.1

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309 Stainless Steel Furnace Tubes Equivalent Grades

STANDARD UNS WERKSTOFF NR. AFNOR EN JIS BS GOST
SS 309 S30900 1.4828
SS 309S S30908 1.4833

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Stainless Steel 309 Furnace Tubes Manufacturing Process

Selection of Materials

The materials used to make furnace tubes are typically resistant to corrosion and high temperatures. Stainless steel, alloy steel, and nickel-based alloys are common materials.

Tube Formation

The creation of the tubes is the first step in the procedure. This can be accomplished using a variety of techniques, including cold drawing, welded tube manufacture, and seamless tube extrusion. Due to their homogeneity and lack of seams that could compromise the structure, seamless tubes are frequently used for high-temperature applications.

Heating and Annealing

The tubes are subsequently put through heat-treating procedures, such as annealing. In order to reduce internal tensions, increase ductility, and improve the material's general qualities, annealing entails heating the tubes to a certain temperature and then gradually cooling them.

Cutting and Sizing

The tubes are sized and cut to the required lengths in accordance with the application's requirements. In order to ensure a perfect fit inside the furnace or heat exchanger, precise cutting and sizing are essential.

Surface Treatment

Depending on the application, the tubes may also go through passivation or pickling as additional surface treatments. By removing oxides, scale, and other contaminants from the surface, these processes increase corrosion resistance.

Quality Control

Quality control procedures are used all through the manufacturing process to guarantee that the tubes meet the necessary requirements. This entails a variety of tests, including visual inspections, non-destructive testing techniques like ultrasonic or radiographic testing, and dimensional checks.

Final Heat Treatment (Optional)

To achieve the appropriate mechanical and metallurgical qualities, the tubes may go through a final heat treatment procedure, such as stress relieving or solution annealing, depending on the material and desired properties.

Finishing

The tubes might undergo further finishing processes such as polishing, buffing, or coating to meet specific application requirements or aesthetic preferences.

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Chemical Composition Of Stainless Steel 309S Furnace Tubes

Grade Fe Cr Ni Mn Si C P S
SS 309 60% 23% 14% 2% 1% 0.20% 0.045% 0.030%
Grade NI C MN P S SI CR MO
SS 309S 12.0 - 15.0 0.08 max 2.0 max 0.045 max 0.030 max 1.0 max 22.0 - 24.0 0.75 max

Mechanical Properties Of 309 Stainless Steel Furnace Tubes

Yield Strength
0.2% Offset0
Ultimate Tensile
Strength
Elongation
in 2 in.
Hardness
psi (min.) (MPa) psi (min.) (MPa) % (min.) (max.)
45,000 310 85,000 586 50 202 (HBN)

Testing & Inspection of 309 Stainless Steel Furnace Tubes

Testing (Destructive, Non Destructive)

Positive Material Identification – PMI Testing Hydrostatic Test
Chemical Analysis – Spectro Analysis Hydrogen-Induced Cracking (HIC) Test
Mechanical Testing Such as Tensile, Elongation, Reduction of Area Sulfide Stress Corrosion Cracking (SSC), NACE TM 0177
Micro Test Radiography Test
Macro Test Dye Penetrant Test (DP Test)
Hardness Test Ultra Sonic Test (UT)
Pitting Resistance Test Eddy Current Testing
Intergranular Corrosion (IGC) Test Impact Test
Flaring Test Bend Test
Flattening Test

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Supply Cities Of Stainless Steel 309 And 309S Furnace Tubes

The cities listed here are where we have supplied our grade 309S stainless steel Furnace Tubes in bulk or small orders. Cities from metropolitan to rural areas we can provide SS 309 Furnace Tubes to satisfy the needs of our clients.

Milan, Busan, Haryana, Baroda, Gurgaon, Mexico City, Moscow, Rajkot, Dammam, Kuala Lumpur, Ho Chi Minh City, Mumbai, Perth, Edmonton, Singapore, Bengaluru, Montreal, Colombo, Bangkok, Kanpur, Visakhapatnam, Lagos, Seoul, Pimpri-Chinchwad, Secunderabad, Rio de Janeiro, Kuwait City, Muscat, Port-of-Spain, London, Sydney, Hong Kong, Ernakulam, Hanoi, Chiyoda, Surat, Calgary, Coimbatore, Bogota, Granada, Nashik, Ahmedabad, Doha, Noida, Dallas, Los Angeles, New Delhi, Lahore, Karachi, Melbourne, Riyadh, Cairo, Bhopal, Manama, Chennai, Abu Dhabi, Istanbul, Dubai, Jeddah, Howrah, Santiago, Al Jubail, Courbevoie, Caracas, Chandigarh, New York, Sharjah, Indore, Vung Tau, Nagpur, Atyrau, Houston, Geoje-si, Jakarta, Vadodara, Kolkata, Thiruvananthapuram, Toronto, Gimhae-si, Ahvaz, Madrid, Mumbai, Petaling Jaya, Tehran, Jaipur, Navi Mumbai, Pune, Ankara, Brisbane, Ranchi, Faridabad, Al Khobar, La Victoria, Hyderabad, Jamshedpur, Algiers, Ulsan, Thane, Aberdeen, Ludhiana.

Documents Provided at the time of Domestic Sales or Export of 309/309S Stainless Steel Furnace Tubes

Certificate of Origin Raw Material Test Reports
Commercial Invoice Heat Treatment Charts
Packing List Quality Assurance Plan (QAP)
Fumigation Certificates NABL approved Laboratory Test Reports
Letter of Guarantee Material Test Certificates
ROHS Certificate Certificate of Compliance/Conformity

Application Industries We Supply Stainless Steel 309 Furnace Tubes

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