UNS C14500 Tellurium Copper Fasteners
UNS C14500 Tellurium Copper Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for UNS C14500 (Tellurium Copper) fasteners. Review the documentation verifying its "Free-Machining" chemistry, high electrical conductivity, and phosphorus-deoxidized resistance to hydrogen embrittlement.
What's Inside This C14500 Tellurium Copper MTC
This sample mill test certificate details the specific chemical and physical parameters required for Tellurium Copper (C14500) fasteners. This unique alloy provides the electrical performance of pure copper while resolving the severe machining difficulties standard ETP copper presents during complex fastener manufacturing.
- Full Traceability: Certified with TC No.: S195/26-XX and fully mapped to ASTM B301 / F468 for nonferrous free-cutting copper alloys.
- Tellurium & Phosphorus Chemistry: Explicitly verifies the critical 0.40 - 0.70% Tellurium addition. The MTC also logs Phosphorus content, confirming the material is deoxidized and completely safe for high-temperature brazing or welding without risk of embrittlement.
- Machinability & Conductivity: This document logs passing electrical conductivity limits of >90% IACS. The Te addition yields short, brittle chips during CNC operations, boosting its machinability rating to 85% compared to pure copper's 20%.
- Cold-Drawn Temper Strength: Confirms the material was supplied in a cold-worked state (e.g., Hard / H04 Temper) to maximize the tensile and yield strength necessary for threaded fasteners.
- Quality Compliance: 100% visual inspection and precision dimensional checks executed to ASME B18.2.1 standards.
Live Preview: UNS C14500 Tellurium Copper MTC Data
Review the specialized free-machining nonferrous parameters before downloading.
TC Number
S195/26-XX
TC Date
12.09.20XX
Material Spec
ASTM B301 / F468 UNS C14500
Bar Shape / Size
Hexagon Bar / 12 mm
Dimensions / Item
Socket Head Cap Screw M12-1.75P x 50 mm
Quantity
1000.00 NOS
Chemical Composition %
| Cu + Ag + Te + P | Te (Tellurium) | P (Phosphorus) | Fe (Iron) |
|---|---|---|---|
| 99.96 | 0.52 | 0.008 | 0.002 |
| Min: 99.90 | Min: 0.40 Max: 0.70 |
Min: 0.004 Max: 0.012 |
Trace |
Mechanical & Electrical Properties (Hard Temper / H04)
| TENSILE STRENGTH (MPa) | YIELD STRENGTH 0.5% Ext (MPa) | % ELONGATION (GL-50mm) | HARDNESS (HRF) | ELECTRICAL COND. (% IACS) |
|---|---|---|---|---|
| 332.50 | 268.40 | 15.00 | 88, 86, 85 | 93.4 |
| Min: 310 (45 ksi) | Min: 240 (35 ksi) | Min: 10 | Min: 80 | Min: 90.0 |
Standard References & Compliance
Our MTC certificates for nonferrous fasteners align with the stringent requirements of the electrical generation, telecom, and precision instrumentation industries. The test reports confirm exact compliance with ASTM B301 / F468 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. |
| Conductivity Standard | Tested via ASTM B193. Meets >90% minimum International Annealed Copper Standard (IACS). |
| Hydrogen Embrittlement | Phosphorus Deoxidized (DHP base) – Safe for high-temperature brazing. |
| Dimensional Accuracy | All Dimensions are as per PO Specification / ASME B18.3. |
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 (maintains strength)
Testing Conditions
- Mechanical tests carried out at room temp
- Electrical Conductivity verified
Technical FAQs — UNS C14500 Tellurium Copper MTC
Why is Tellurium added to this copper alloy?
Pure copper is extremely "gummy" and difficult to machine. It sticks to cutting tools and creates long, continuous stringy chips, making complex parts like socket head cap screws difficult to manufacture accurately. The addition of roughly 0.5% Tellurium creates microscopic inclusions in the metal structure. During machining, these inclusions cause the chips to break off short and clean, vastly extending tool life and resulting in an 85% machinability rating (compared to pure copper's 20%).
Does adding Tellurium ruin the electrical conductivity?
No, that is the primary advantage of C14500. While adding other hardening or machining agents (like Zinc or Tin) drastically lowers conductivity, Tellurium has a remarkably minimal effect. Tellurium Copper retains a minimum of 90% IACS (often testing around 93-95%), making it the ideal choice for high-current electrical switchgear components that require extensive CNC machining.
Can C14500 fasteners be welded or brazed?
Yes. Unlike standard ETP Copper (C11000) which contains oxygen and can suffer from hydrogen embrittlement when heated, Tellurium Copper is alloyed with a small amount of Phosphorus (0.004 - 0.012%). This acts as a deoxidizer, ensuring the copper is immune to embrittlement and completely safe for high-temperature silver brazing or welding in electrical busbar assemblies.