UNS C51000 Phosphor Bronze Fasteners – MTC
UNS C51000 Phosphor Bronze Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for UNS C51000 (Phosphor Bronze 5% A) fasteners. Review the documentation verifying its specific Phosphorus and Tin alloying, guaranteeing exceptional fatigue resistance, structural strength, and non-magnetic performance.
What's Inside This C51000 Phosphor Bronze MTC
This sample mill test certificate highlights the critical testing parameters required for UNS C51000 fasteners. Widely used in marine, electrical, and electromechanical applications, Phosphor Bronze offers a unique combination of high wear resistance, excellent spring qualities, and superior fatigue life.
- Full Traceability: Certified with TC No.: S281/26-XX and fully mapped to ASTM F468 and ASTM B139 specifications for nonferrous bolting materials.
- Tin & Phosphorus Chemistry: Explicitly verifies the addition of ~5% Tin (Sn) for strength and corrosion resistance, along with the critical 0.03 - 0.35% Phosphorus (P) which acts as a powerful deoxidizer and wear-resistance enhancer.
- Fatigue & Wear Resistance: Due to its extremely fine-grained structure (aided by the Phosphorus), this alloy excels in applications subjected to repeated stress, vibration, and friction.
- Cold-Drawn Temper Strength: Confirms the material was supplied in a Hard Drawn temper (H04), ensuring the final machined fastener possesses tensile strengths exceeding 550 MPa (80 ksi).
- Quality Compliance: 100% visual inspection, precision dimensional checks executed to ASME B18.2.1, and verified as completely non-magnetic and spark-resistant.
Live Preview: UNS C51000 Phosphor Bronze MTC Data
Review the specific chemical limits emphasizing the Tin and Phosphorus content before downloading.
TC Number
S281/26-XX
TC Date
04.05.20XX
Material Spec
ASTM F468 / B139 UNS C51000
Bar Shape / Size
Hexagon Bar / 12 mm
Dimensions / Item
Hex Head Bolt M12-1.75P x 60 mm
Quantity
600.00 NOS
Chemical Composition %
| Cu (Copper) | Sn (Tin) | P (Phosphorus) | Fe (Iron) | Pb (Lead) | Zn (Zinc) |
|---|---|---|---|---|---|
| Rem (94.62) | 5.15 | 0.12 | 0.01 | 0.01 | 0.05 |
| Remainder | Min: 4.2 Max: 5.8 |
Min: 0.03 Max: 0.35 |
Max: 0.10 | Max: 0.05 | Max: 0.30 |
Mechanical Properties (Hard Temper / H04)
| TENSILE STRENGTH (MPa) | YIELD STRENGTH 0.5% Ext (MPa) | % ELONGATION (GL-50mm) | HARDNESS (HRB) |
|---|---|---|---|
| 620.50 | 495.20 | 18.00 | 90, 88, 92 |
| Min: 550 (80 ksi) | Min: 415 (60 ksi) | Min: 10 | Typical: 85-95 |
Standard References & Compliance
Our MTC certificates for nonferrous fasteners align with the stringent requirements of the electromechanical, marine, and aerospace industries. The test reports confirm exact compliance with ASTM F468 and ASTM B139 with respect to the specific heat and lot tested.
| Standard / Requirement | Confirmation on Certificate |
|---|---|
| Visual Inspection | 100% visual inspection carried out & found free from defects. |
| Magnetic Permeability | Material is confirmed completely Non-Magnetic. |
| Safety Requirements | Material is verified non-sparking and free from radioactive contamination. |
| Dimensional Accuracy | All Dimensions are as per PO Specification / ASME B18.2.1. |
Certification Details
We confirm that the above mentioned items were Manufactured, Sampled, Tested, and Inspected in accordance with the subjected Customer's Purchase Order and applicable Drawings, Material Specifications, Codes & Standards.
Documentation Standard
- EN 10204-2004: 3.1 Standard
- Free from radioactive contamination
- Certified ISO 9001: 2015 Company
Processing State
- Cold Drawn / Hard Temper (H04)
- Not heat treated (relies on cold working for strength)
Testing Conditions
- Mechanical tests carried out at room temp
- 100% visual and thread gauging carried out
Technical FAQs — UNS C51000 Phosphor Bronze MTC
Why is Phosphorus added to this copper alloy?
During the melting and casting process, molten copper readily absorbs oxygen, which can create microscopic voids and weaken the metal. Phosphorus is added as a powerful deoxidizing agent. It chemically binds with the oxygen, removing it from the melt. The trace amount of Phosphorus (0.03 - 0.35%) left behind in the C51000 matrix significantly increases the alloy's wear resistance, stiffness, and fatigue strength.
How does C51000 Phosphor Bronze compare to C65500 Silicon Bronze?
While both are excellent, high-strength, non-magnetic marine alloys, they serve slightly different purposes. Silicon Bronze (C65500) is often preferred for general heavy-duty fastening and welding due to its extreme toughness and lower cost. Phosphor Bronze (C51000) is specifically chosen for environments subject to high friction, continuous wear, or cyclical vibration/fatigue, such as in pump internals, electrical switchgear springs, and moving electromechanical contacts.
Is Phosphor Bronze magnetic?
No. UNS C51000 is entirely non-magnetic. Because of its excellent combination of strength, fatigue resistance, and non-magnetic properties, it is frequently used to fasten sensitive electronic enclosures and medical imaging equipment (like MRI machines) where magnetic interference is unacceptable.