What is stainless steel 304H furnace tube, and what are its key properties?
A Stainless Steel 304H Furnace Tube is a specialized component in high-temperature applications, particularly in furnace systems. It is made from stainless steel grade 304H, a variation of the popular 304 stainless steel alloy. The key properties of stainless steel 304H furnace tubes lie in their excellent high temperature and corrosion resistance. These tubes can withstand temperatures up to approximately 1900°F (1040°C) without losing structural integrity.

Additionally, they exhibit superior resistance to oxidation, scaling, and intergranular corrosion, making them suitable for use in harsh and corrosive environments. Stainless steel 304H furnace tubes also offer strength, ductility, and formability, allowing easy fabrication and installation. These properties make them a reliable choice for various industrial applications, such as heat exchangers, boilers, furnaces, and other high-temperature processes where durability and resistance to corrosion are crucial.

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What are the common applications of stainless steel 304H furnace tubes?
Stainless Steel 304H Furnace Tubes find various applications in various industries that require reliable performance under high-temperature conditions. One common application is heat exchangers, where these tubes facilitate efficient heat transfer between fluids or gases in systems such as power plants, chemical processing plants, and refineries. They are also used in boiler systems, which help generate steam for power generation or heating. Stainless steel 304H furnace tubes are commonly employed in furnace systems, including industrial furnaces and kilns, where they serve as a conduit for hot gases, ensuring their safe and controlled transportation.

Additionally, these tubes are used in the petrochemical industry, particularly in the production of petrochemicals and in the manufacturing of various high-temperature process equipment. Due to their excellent corrosion resistance, Stainless Steel 304H Furnace Tubes can be found in applications involving corrosive environments, such as chemical plants, desalination plants, and wastewater treatment facilities. Their versatility and ability to withstand high temperatures and corrosive conditions make stainless steel 304H furnace tubes a reliable choice for critical applications in diverse industries.

Specification Of 304H 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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304H Stainless Steel Furnace Tubes Equivalent Grades

STANDARD UNS WERKSTOFF NR. EN BS
SS 304H S30409 1.4948 X6CrNi18-11 304S51

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Stainless Steel 304H 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 304H Furnace Tubes

Grade C Mn Si P S Cr Mo Ni N
SS 304H 0.10 max 2 max 0.75 max 0.045 max 0.03 max 18 – 20 - 8 – 10.5 -

Mechanical Properties Of 304H Stainless Steel Furnace Tubes

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.0 g/cm3 1400 °C (2550 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 40 %

Testing & Inspection of 304H 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 304H Furnace Tubes

The cities listed here are where we have supplied our grade 304H stainless steel Furnace Tubes in bulk or small orders. Cities from metropolitan to rural areas we can provide SS 304H Furnace Tubes to satisfy the needs of our clients.

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

Documents Provided at the time of Domestic Sales or Export of 304H 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

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