Inventory Details

253MA^® S30815

Main Ingredients

Chromium (Cr)

20 ~ 22

Nickel (Ni)

10 ~ 12

Iron (Fe)

Remaining

Product features

Country of Origin

Japan/USA/Germany
Execution Standard

ASTM A240
Main Composition

20Ni-19Cr-Ti, Al

Modulus of Elasticity: 29×10⁶ PSI (200 GPa)
Density: 0.29 lb/in³ (8.03 g/cm³)
Thermal Conductivity:

°F	°C	Btu·in/h·ft²·°F	W/m·K
68-132	20-56	90.0	12.9
68-204	20-96	93.6	13.5
68-333	20-167	104.4	15.0
68-465	20-241	114.0	16.3
68-590	20-310	122.4	17.6
68-726	20-385	133.2	19.2
68-848	20-453	145.2	20.9

Corrosion Resistance

840 (S33400) alloy is an austenitic stainless steel containing titanium and aluminum. It has sufficient chromium to form and maintain a robust scale of chromium oxide, providing protection under high-temperature conditions. It offers better high-temperature resistance than traditional chromium-nickel stainless steels such as 304. Its higher nickel content provides superior oxidation resistance compared to standard 18-8 stainless steels, with oxidation resistance comparable to higher-grade alloys used at temperatures up to 1900°F (1038°C). Therefore, 840 (S33400) alloy is an ideal material for manufacturing electric heating tubes, automotive emission control systems, and other high-temperature resistant products.
Applications

Due to its formability, weldability, corrosion resistance, and oxidation resistance, 840 alloy is a common material for electric heating tubes. It is used in the production of electric heating tubes, heat exchangers, equipment heaters, industrial heating furnaces, and other devices. It is also frequently used in automotive exhaust systems.

Electric heating tubes are specialized electrical components that convert electrical energy into thermal energy. Due to their ease of use, simple installation, and pollution-free operation, they are widely used in various heating applications. They feature a simple structure, high mechanical strength, high thermal efficiency, safety, reliability, easy installation, and a long service life. They are widely applied in various water tanks, oil tanks, acid and alkali tanks, molten metal furnaces, air heating furnaces, drying ovens, drying chambers, baking ovens, and hot press molds. Specific forms include hot runner heating coils, heating rods, heating tubes, thermocouples, temperature control boxes, temperature control accessories, and connectors, among other industrial components.
Supply Form

Coiled Strip

Our Partners

Aerospace and Aviation

Our materials jointly fend off corrosion from high-altitude moisture, fuel residues, and extreme atmospheric conditions, endure intense temperatures and extreme pressure changes, fit both core operations and routine equipment needs, ensuring safe flight operations, minimal maintenance demands, and long-lasting reliability for commercial jets, military aircraft, and spacecraft.

Marine Engineering

Our materials collectively resist corrosion from saltwater, seawater mist, and marine organisms, withstand extreme temperatures and pressure fluctuations, suit both critical operations and general equipment needs, ensuring safe marine operations, low-maintenance costs, and long-lasting industrial performance in harsh ocean environments.

Petrochemical industry

Our materials collectively resist corrosion from harsh substances like acids and chlorides, and withstand high temperatures in demanding processes. These materials suit both critical operations and general equipment needs to ensure safe, low-maintenance, and long-lasting industrial operations.

Automotive

Our materials collectively resist corrosion from road salts, moisture, and engine fluids, withstand high temperatures in powertrain and exhaust systems, suit both critical operations and general equipment needs, ensuring safe vehicle performance, low-maintenance requirements, and long-lasting durability under daily driving and harsh road conditions.

Biopharmaceuticals

Our materials collectively resist corrosion from harsh bioprocess fluids, withstand stable temperatures in precise production processes, suit both critical operations and general equipment needs, ensure safe drug production, low-maintenance facility running, and long-lasting industrial operations that meet strict regulatory standards.

Construction & Infrastructure

Our materials jointly fend off corrosion caused by rainfall, dampness, and urban contaminants—key for withstanding outdoor exposure—bear heavy weights and harsh weather, fit both vital applications and everyday equipment uses, guaranteeing safe infrastructure operation, reduced upkeep expenses, and enduring structural reliability for public and commercial developments.

Electronics

Our materials jointly resist corrosion from moisture, dust, and chemical coolants, endure stable temperatures in high-heat components, fit both core operations and routine equipment needs, ensuring reliable electronic performance, reduced maintenance efforts, and long-lasting durability for consumer gadgets, industrial controls, and telecom hardware.

Energy Industry

Our materials jointly ward off corrosion from fuel byproducts, high-pressure fluids, and environmental elements, endure extreme temperatures in power generation and transmission, fit both core operations (oil/gas well casings, renewable energy hardware) and routine equipment needs, ensuring safe energy production/transmission, cut maintenance costs, and long-term reliability across fossil fuel and clean energy sectors.

Environmental industry

Our materials collectively resist corrosion from industrial waste, acidic/alkaline effluents, and chemical treatments, withstand temperature variations in waste processing and water treatment systems, suit both critical operations and general equipment needs, ensuring safe environmental remediation, low-maintenance facility upkeep, and long-lasting performance in waste management and sustainability-focused processes.

Medical

Our materials collectively resist corrosion from sterilizing agents and bodily fluids, maintain structural stability in precision medical devices, suit both critical operations and general equipment needs, ensure safe patient care, low-maintenance device upkeep, and long-lasting performance that meets strict medical regulatory standards.

Aerospace and Aviation

Marine Engineering

Petrochemical industry

Automotive

Biopharmaceuticals

Construction & Infrastructure

Electronics

Energy Industry

Environmental industry

Medical

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253MA^® S30815

Main Ingredients

Product features

Country of Origin

Execution Standard

Main Composition

Physical Properties

Corrosion Resistance

Applications

Supply Form