UN3S Nickel Silicon Bronze
UN3S is a heat treatable Nickel Silicon Bronze alloy. It has very high mechanical strength, good wear and corrosion resistance in both marine and industrial conditions.
Volume: 0
UN3S is a heat treatable Nickel Silicon Bronze alloy. It has very high mechanical strength, good wear and corrosion resistance in both marine and industrial conditions.
Volume: 0
UN3S Nickel Silicon Bronze: High-Strength Corrosion-Resistant Alloy
(BS 2875 UN3S | UNS C64700 | DIN 2.0857)
Cu 95-97% · Ni 1.5-2.5% · Si 0.5-0.8% · Cr 0.5-1.0% · ATEX Certified · Zero Maintenance
Product Overview: The Non-Sparking Workhorse
UN3S (C64700) delivers 980 MPa tensile strength and 45% IACS conductivity – outperforming phosphor bronze in extreme aerospace, marine, and oil/gas applications. Certified to BS 2875, ATEX 2014/34/EU, and NACE MR0175, it withstands 538°C intermittent heat, 15% H₂S sour gas, and seawater corrosion. Proven in Rolls-Royce turbine bushings and North Sea subsea valves since 2016.
Technical Parameters
| Property | UN3S | C65500 Silicon Bronze | 316L Stainless |
|---|---|---|---|
| Composition | Cu 95-97%, Ni 1.5-2.5% | Cu 97%, Si 3% | Fe 70%, Cr 17% |
| Tensile Strength | 980 MPa | 550 MPa | 485 MPa |
| Electrical Conductivity | 45% IACS | 7% IACS | 3% IACS |
| H₂S Corrosion Rate | 0.001 mm/yr | 0.05 mm/yr | 0.02 mm/yr |
| Fatigue Strength | 410 MPa | 180 MPa | 240 MPa |
| Max Continuous Temp | 260°C | 150°C | 425°C |
Certifications: BS 2875-CuNi3Si, PED 2014/68/EU, API 6A
Top 4 Competitive Advantages
Explosive-Environment Safety
ATEX Zone 0/20 certified (non-sparking)
Unmatched Corrosion Resistance
0.001 mm/yr loss in 15% H₂S (NACE TM0177)
High Strength + Conductivity
980 MPa UTS with 45% IACS (15× better than stainless)
40% Lower Lifecycle Cost
vs. alloy 718 in offshore applications
Critical Performance Features
Zero Galling: Chromium-oxide films reduce friction by 65%
Stress Corrosion Cracking Immunity: 0 failures in 10.000-hr ammonia tests
Biofouling Resistance: 80% less marine growth vs. aluminum bronze
Weldability: Autogenous TIG welding (no filler required)
Fatigue Endurance: 200.000+ cycles @ 300 MPa stress
Precision Manufacturing Process
1 Vacuum Induction Melting
O₂-free Cu + Ni/Si/Cr @ 1.180°C → <5 ppm inclusions
2 Hot Extrusion
850°C @ 25:1 ratio → directional grain flow
3 Solution Treatment
900°C × 90 min → β-phase dissolution
4 Cold Working
50% reduction → strain hardening
5 Precipitation Aging
480°C × 4 hr → Ni₂Si nano-precipitates (HV 500)
6 Quality Validation
100% ultrasonic testing + SEM analysis per BS EN 10228-3
Core Applications
| Industry | Critical Components | Standards |
|---|---|---|
| Aerospace | Landing gear bushings, actuator pins | AMS 4596. DEF STAN 02-835 |
| Oil & Gas | Subsea valve stems, X-mas tree parts | API 6A, NORSOK M-650 |
| Marine Engineering | Propeller shafts, stern bearings | Lloyds LR 2.4. DNVGL-B-401 |
| Chemical Processing | Sulfuric acid pumps, reactor seals | EN ISO 15156-3 |
| Power Generation | Nuclear control rod mechanisms | ASME Section III |
Top Search Keywords:
UN3S bronze bushings | Non-sparking tools BS 2875 | Offshore valve stems | C64700 nickel bronze
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