Technical Comparison Between ST35.8 and A179 Boiler Tubes: Which One is Right for Your Steam System?
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Introduction
In steam-based industrial systems, selecting the appropriate boiler tube plays a critical role in system efficiency, safety, and longevity. Two widely used tubes in this context are ST35.8 and A179. While both are employed in high-temperature and pressure environments, they serve different performance profiles. This article provides a comprehensive technical comparison to help engineers, procurement teams, and project managers make informed decisions.
1. General Overview of ST35.8 and A179 Tubes
Specification ST35.8 A179 Standard DIN 17175 ASTM A179 Application High-pressure boiler systems Heat exchangers, condensers Material Type Carbon Steel Low-carbon Steel Manufacturing Seamless Seamless Max Operating Temp Up to 550°C Up to 400°C
2. Chemical Composition
Element ST35.8 (%) A179 (%) Carbon (C) ≤ 0.17 ≤ 0.06 Manganese (Mn) 0.40 – 0.80 0.27 – 0.63 Phosphorus (P) ≤ 0.025 ≤ 0.035 Sulfur (S) ≤ 0.020 ≤ 0.035 🔎 Insight: A179 contains significantly less carbon, making it more suitable for applications requiring superior heat transfer, while ST35.8 offers higher strength under elevated temperatures.
3. Mechanical Properties
Property ST35.8 A179 Tensile Strength (MPa) 360–480 325–485 Yield Strength (MPa) ≥ 235 ≥ 180 Elongation (%) ≥ 25 ≥ 35 📌 Conclusion: ST35.8 provides better mechanical strength, whereas A179 offers higher ductility and is easier to bend or form.
4. Typical Applications
- ST35.8:
- High-pre
- ssure boiler tubes
- Power plant piping systems
- Superheaters
- Industrial steam lines
- A179:
- Heat exchangers
- Condensers
- Low to medium pressure boiler tubes
- HVAC applications
5. Selection Guidelines: Which One Should You Choose?
Condition Recommended Tube High temperature (above 450°C) ST35.8 Need for high heat transfer A179 Pressure critical applications ST35.8 Budget-sensitive projects A179 Ease of forming & bending A179 ✅ Pro Tip: When your steam system demands high mechanical strength and performance at elevated temperatures, ST35.8 is the ideal choice. For projects that require thin-wall tubing with excellent thermal conductivity, A179 is a better fit.
6. Final Words
🔗 For expert advice or to check stock availability, contact Jahan Tajhiz Abdal, your reliable supplier of boiler and heat exchanger tubes.
https://www.jahantajhizabdal.ir/
Tags: #ST358 #A179 #BoilerTubes #HeatExchangers #IndustrialPiping #SteamSystems #MechanicalEngineering