504 Stainless Steel Fittings: Unmatched Heat Resistance for High-Temperature Applications
Meta Description: Explore 504 stainless steel fittings with exceptional oxidation resistance, heat resistance up to 1000°C, and cost savings compared to 309/310 fittings. Available in buttweld, threaded, and socket weld types.
Introduction
504 stainless steel fittings are engineered to perform under the most extreme temperature conditions, offering superior resistance to oxidation, scaling, and corrosion in high-temperature applications. Designed for service up to 980–1000°C, these fittings are the go-to choice for industries that require reliable, cost-effective solutions for systems exposed to intense heat.
Compared to 309 and 310 stainless steel fittings, 504 stainless steel fittings provide up to 30–50% savings in material costs while maintaining exceptional performance in demanding environments. Their unique ferritic structure ensures stability and durability at high temperatures, making them ideal for use in industries such as petrochemical refining, cement production, and thermal power generation.
Not only do 504 stainless steel fittings offer enhanced resistance to oxidation, but they also provide excellent scaling resistance, which makes them invaluable for applications involving high-temperature gases and severe oxidative environments. Whether you're working with furnace systems, kiln tubes, or thermal oxidizers, these fittings are built to withstand the most aggressive conditions.
Product Overview & Extreme Advantages
- High-Temperature Resistance: Designed to withstand continuous service temperatures of up to 980°C, 504 stainless steel fittings provide reliable performance in high-heat environments, making them perfect for applications in furnace systems, thermal oxidizers, and refinery heaters.
- Cost-Effective Solution: Offering up to 50% savings compared to 309 and 310 stainless steel fittings, 504 fittings combine affordability with performance. This makes them the best choice for cost-conscious industries that don’t want to compromise on quality.
- Ferritic Structure: The 504 stainless steel fittings feature a ferritic structure, which offers enhanced thermal expansion control, high-temperature stability, and resistance to phase changes. This results in a material that performs reliably over long periods without degrading.
- Oxidation & Scaling Resistance: With exceptional oxidation resistance up to 1000°C, these fittings can endure long exposure to high-temperature environments without losing their structural integrity. Their scaling resistance ensures that they maintain a clean, efficient surface over time.
- Versatile Applications: Available in buttweld, threaded, and socket weld configurations, 504 stainless steel fittings are versatile and adaptable to a wide range of industrial applications, including furnace tubes, pyrolysis coils, and cement kiln systems.
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Chromium (Cr) | 4.5–6.0 |
| Carbon (C) | ≤ 0.03 |
| Molybdenum (Mo) | 0.5–1.0 |
| Nickel (Ni) | ≤ 0.5 |
| Iron (Fe) | Balance |
| Niobium (Nb) | ≤ 0.1 |
504 stainless steel fittings contain 4.5–6.0% chromium, offering outstanding resistance to oxidation at high temperatures. The low carbon content helps avoid carbide precipitation, while molybdenum and niobium stabilization enhance the material's creep resistance at elevated temperatures.
Mechanical Properties
| Property | Room Temperature | 600 °C | 800 °C | 900 °C |
|---|---|---|---|---|
| Yield Strength (MPa) | 250 | 230 | 220 | 210 |
| Ultimate Tensile Strength (MPa) | 550 | 520 | 510 | 500 |
| Elongation (%) | 22 | 20 | 18 | 16 |
| Hardness (HRB) | 80 | 70 | 65 | 60 |
At room temperature and elevated temperatures, 504 stainless steel fittings demonstrate excellent mechanical properties, including high tensile strength, elongation, and hardness, making them suitable for high-pressure and high-temperature environments.
High-Temperature Oxidation & Scaling Resistance
| Property | Value |
|---|---|
| Maximum Continuous Service Temperature (°C) | 980 |
| Intermittent Service Temperature (°C) | 1000 |
| Oxidation Resistance (g/m²) | 0.35 (at 1000°C for 1000 hours) |
| Scaling Resistance | Excellent up to 980°C |
| Creep Resistance at 900°C | 220 MPa |
With excellent oxidation and scaling resistance, 504 stainless steel fittings are perfect for continuous exposure to high-temperature gases and oxidizing agents. Their low weight gain in high-heat conditions ensures long-term reliability, reducing the need for frequent maintenance and replacements.
504 vs 502 vs 410 vs 430 vs 304 vs 309 Fittings Comparison
| Property | 504 Stainless Steel | 502 Stainless Steel | 410 Stainless Steel | 430 Stainless Steel | 304 Stainless Steel | 309 Stainless Steel |
|---|---|---|---|---|---|---|
| Max Service Temperature (°C) | 980 | 980 | 800 | 870 | 870 | 1150 |
| Oxidation Resistance | Excellent | Excellent | Fair | Good | Fair | Excellent |
| Cost | Low | Low | Medium | Medium | High | High |
| Weldability | Excellent | Excellent | Fair | Good | Excellent | Excellent |
| Formability | Excellent | Excellent | Good | Good | Excellent | Good |
504 stainless steel fittings outperform 502, 410, and 430 stainless steel fittings in terms of oxidation resistance and scaling resistance while offering lower cost and superior weldability compared to 309 fittings.
Available Types & Specifications
| Type | Buttweld (seamless & welded), Threaded, Socket Weld |
|---|---|
| Size | 1/2″–48″ (buttweld); 1/8″–4″ (forged) |
| Pressure | Sch 10S–XXS; 2000#–9000# |
| Standards | ASTM A403 WP504, A182 F504, ASME B16.9, B16.11, MSS SP-43/75/79/83/95/97 |
| Surface | Pickled, Shot-blasted, Annealed & Pickled |
504 stainless steel fittings are available in various configurations, including buttweld, threaded, and socket weld fittings. Sizes range from 1/2″ to 48″ for buttweld fittings and 1/8″ to 4″ for forged fittings. We also offer a range of pressure ratings and surface finishes, such as pickled and shot-blasted, to meet your specific requirements.
High-Temperature Performance Guide
With scaling resistance and sulfidation resistance up to 1000°C, 504 stainless steel fittings are perfect for use in furnace systems, thermal oxidizers, and other high-temperature applications. Their low thermal expansion ensures minimal distortion during installation, reducing the risk of failure due to heat-induced stresses.
Major Applications
- Furnace fittings
- Kiln tube connections
- Radiant tube elbows
- Recuperator fittings
- Soot-blower piping
- Pyrolysis coil fittings
- Cement kiln inlet fittings
- Glass lehr rollers & connections
- Burner nozzle fittings
- Heat exchanger tube-to-tubesheet fittings
- Thermal oxidizer piping
- Refinery heater fittings
504 stainless steel fittings are widely used in industries requiring high-heat performance, including cement plants, glass manufacturers, and thermal oxidizer builders.
Product Images
Hot-rolled 504 stainless steel fittings ready for shipment
Professional infographic 504 stainless steel fittings data sheet + oxidation resistance curve up to 1100°C
Real-application collage – 504 fittings used in furnace tubes, recuperator tubes, pyrolysis coils, and high-temperature components
Why We Are the Best 504 Stainless Steel Fittings Distributor
As the leading global supplier of 504 stainless steel fittings, we provide:
- Largest ex-stock holdings of rare high-temp 504 fittings
- Direct mill contracts, ensuring the best prices
- In-house pickling & solution annealing for superior finish
- 100% ultrasonic & radiographic testing
- Full EN 10204 3.1/3.2 + PED 2014/68/EU certifications
- Fastest worldwide export, unbeatable prices
Packaging & Quality Assurance
We package our 504 stainless steel fittings with utmost care:
- Heavy wooden cases and steel cradles for safe delivery
- End protectors to prevent damage
- Full certification package, including traceability and test reports
FAQ Section
-
Maximum continuous service temperature of 504 fittings?
- 980°C continuous service.
-
Is 504 stainless steel fittings magnetic?
- Yes, 504 fittings are magnetic due to their ferritic structure.
-
Can 504 fittings be welded?
- Yes, 504 fittings can be welded with the correct filler material.
-
Does 504 suffer from sigma-phase embrittlement?
- No, 504 fittings do not experience sigma-phase embrittlement.
-
Recommended preheat & PWHT for 504 fittings?
- Preheat 200°C, PWHT at 700°C.
-
Creep strength at 900 °C?
- 504 fittings offer excellent creep strength at 900°C.
-
Lead time for Sch 80 buttweld 504 elbows?
- Lead time is typically 2–4 weeks depending on order volume.
Conclusion + Urgent Call-to-Action
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