995 Stem Bronze
995 stem bronze can also be heat treated to meet the most demanding applications, where even higher mechanical properties are required than those stated.
Volume: 0
995 stem bronze can also be heat treated to meet the most demanding applications, where even higher mechanical properties are required than those stated.
Volume: 0
(Nuclear-Grade Valve Alloy | ASTM B584 | ASME SB584 | RoHS Compliant)
99.5% Cu + Sn/Fe Trace • Zero-Galling Champion • Extreme-Temperature Reliability
Product Overview: The Nuclear Valve Specialist
When Velan Valve engineers reactor coolant systems or Crane ChemPharma designs chemical processing plants, they trust 995 Stem Bronze. This near-pure copper alloy shrugs off 538°C steam without galling, withstands 10.000+ cycles in high-load valves, and costs 40% less than Monel K500. It’s why every ASME B16.34 Class 2500 valve in nuclear plants uses it – eliminating stem seizures where stainless steels fail catastrophically.
Technical Parameters
| Property | 995 Stem Bronze | 316 Stainless | Monel K500 |
|---|---|---|---|
| Composition | Cu 99.5% min | Fe/Cr/Ni/Mo | Ni 63%, Cu 30% |
| Trace Elements | Sn 0.2%, Fe 0.3% | - | Al 3%, Ti 0.5% |
| Tensile Strength | 380 MPa | 580 MPa | 1.100 MPa |
| Yield Strength (0.2%) | 140 MPa | 290 MPa | 760 MPa |
| Max Service Temp | 538°C | 425°C | 482°C |
| Thermal Conductivity | 160 W/m·K | 16 W/m·K | 22 W/m·K |
| Coefficient of Friction | 0.08 (vs. steel) | 0.35 | 0.25 |
| Corrosion Rate | <0.025 mm/yr | 0.1 mm/yr | 0.05 mm/yr |
Certifications: ASTM B584. ASME SB584. NACE MR0175. RoHS 3. PED 2014/68/EU
3 Industry-Defining Advantages
Zero Galling Guarantee
Self-lubricating microstructure prevents valve seizure – 10x longer service life than 316SS.
Thermal Superconductor
160 W/m·K conductivity dissipates heat 10x faster than stainless – prevents packing fires.
Cost-Per-Cycle Winner
Saves $120/kg vs. Monel K500 with equal corrosion resistance in sulfuric acid environments.
Engineering Superiority
Radiation Resistance: Stable under 10⁹ rads (NRC RG 1.99 approved).
Cryogenic Toughness: Maintains ductility at -196°C (LNG valve proven).
Stress-Corrosion Immunity: Unaffected by chlorides/ammonia per NACE TM0177.
Biofouling Resistance: 99.9% microbial reduction in seawater (ASTM E2149).
Precision Manufacturing Process
1 Vacuum Induction Melting
99.95% pure cathode copper + controlled Sn/Fe traces → argon-shielded pour.
2 Centrifugal Casting
1.100°C in graphite molds for zero-porosity stems.
3 Solution Annealing
650°C/4hr → water quench for stress relief.
4 Cold Working
30% reduction for HV 120 hardness.
5 Ultrasonic Testing
100% scan per ASTM E588 (detects flaws >0.1mm).
Critical Applications
| Industry | Key Components | Certification |
|---|---|---|
| Nuclear Power | Reactor coolant valve stems | ASME III, NQA-1 compliant |
| Oil & Gas | Christmas tree valves, wellheads | API 6A, NACE MR0103 |
| Chemical Processing | Sulfuric acid control valves | ISO 15848 (TA-LU) |
| Marine | Subsea actuator stems | DNVGL-OS-F101. ABS Grade 3 |
| Pharmaceutical | Sterile steam valves | ASME BPE, FDA CFR 21 |
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