JIANGSU CHINA STEEL UNION INDUSTRIAL CO.,LTD.
江苏中钢联合实业有限公司
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ASME SA-479 347H Stainless Steel Bar - High Temperature Resistant, 20mm TPI Threads
ASME SA-479 347H stainless steel bar with precision 20mm TPI (threads per inch) redefines high-temperature fastening in next-generation energy and aerospace systems. Stabilized with niobium (Nb), this austenitic alloy resists sensitization and creep deformation at temperatures up to 900°C, outperforming standard 304/316 grades in cyclic thermal environments. The laser-cut 20mm TPI threads ensure leak-proof integrity in pressurized hydrogen pipelines, molten salt reactors, and hypersonic propulsion units. Engineered for ultra-low thermal expansion and carbide precipitation control, it bridges the gap between extreme heat resilience and mechanical reliability for Industry 5.0 applications.
| Parameter | Details |
|---|---|
| Material | 347H Stainless Steel (UNS S34709) |
| Element Composition | Cr: 17–19%, Ni: 9–13%, Nb: 10×C% min, C: 0.04–0.10%, Mn: ≤2%, Fe: Balance |
| Thread Specification | 20mm TPI (UNJC/UNJF standards), ±0.005mm pitch accuracy |
| Standard | ASME SA-479, ASTM A276, EN 10088-1, API 6ACRA |
| Thermal Properties | Continuous service: 900°C, Thermal expansion coefficient: 18.5 μm/m·°C (20–100°C) |
| Mechanical Performance | Tensile Strength: ≥690 MPa, Stress rupture limit: 100 MPa (800°C/10k hrs) |
| Surface Innovation | Plasma electrolytic oxidation (PEO) coating optional for H₂S resistance |
| Certifications | NACE MR0175 (Sour Service), TÜV SÜD H₂-Readiness, Nadcap AMS2750 |
| Eco-Innovation | 60% Post-Industrial Recycled Content, Low-Carbon Smelting (≤1.5t CO₂/ton) |
① Hydrogen-Embrittlement Immunity
Niobium stabilization eliminates sigma phase formation, ensuring ductility in hydrogen-rich environments up to 700°C.
② Smart Thread Analytics
AI-optimized thread geometry reduces stress concentration by 40%, validated via digital twin simulations.
③ Sulfur & Chloride Defense
Optional PEO nano-coating withstands sour gas (H₂S) and geothermal brine corrosion for oil & gas extremes.
④ Zero Thermal Slack
Controlled grain boundary engineering prevents thread loosening under 10,000+ thermal cycles.
⑤ Hypersonic-Ready
Low outgassing properties meet ESA/NASA standards for reusable launch vehicle thrust chamber fasteners.
⑥ Circular Lifecycle
Designed for disassembly and remanufacturing, slashing cradle-to-grave emissions by 70%.
Why This Product?
The 347H threaded bar transcends traditional high-temperature alloys by merging aerospace-grade precision with decarbonization-ready metallurgy. From unlocking Earth’s most hostile energy reserves to anchoring humanity’s interplanetary ambitions, it’s engineered for environments where materials must not just survive—they must evolve.
FAQ
Q: Why choose us?
A: Our company have been in steel business for more than ten years, we are internationally experienced, professional, and we can provide variety of steel products with high quality to our clients.
Q: Can provide OEM/ODM service?
A: Yes. Please feel free to contact us for more details discuss.
Q: How is your Payment Term?
A:One is 30% deposit by TT before production and 70% balance against copy of B/L; the other is Irrevocable L/C 100% at sight.
Q: Can we visit your factory?
A: Warmly welcome. Once we have your schedule, we will arrange the professional sales team to follow up your case.
Q: Can you provide sample?
A: Yes, for regular sizes sample is free but buyer need to pay freight cost.
Q: How long is your delivery time?
A: Our daily inventory is more than 8000 tons, so for common product size, just need 3 days from stocks; if the special size from new production, delivery 15-20 days.