Seven thermocouple alloys, vacuum-melted to ±0.1%, as ingot or φ5.5 mm rod.
Alloy Ingot
Process 01 — Alloy Melting
Cast solid metal from vacuum induction melting (VIM). Composition controlled to ±0.1%. Sold as upstream raw material.
Enquire about this form →Wire Rod / Billet
Process 02 — Hot Rolling
Hot-rolled reduced wire rod / round bar (standard φ5.5 mm), ready for downstream precision wire drawing.
Enquire about this form →How an alloy semi is produced
- Vacuum induction melt — chamber below 10⁻² mbar, argon back-fill, 1500–1650 °C.
- Cast to ingot or billet, and assign a unique furnace batch number to the melt.
- Hot-roll to standard φ5.5 mm wire rod, ready for downstream precision drawing.
| Alloy | Composition | Used in |
|---|---|---|
| Chromel | NiCr 90/10 | Type K / E positive leg |
| Alumel | NiAl 95/5 + Mn 2 / Si 1 | Type K negative leg |
| Nicrosil | NiCrSi (Ni + 14.2Cr + 1.4Si) | Type N positive leg |
| Nisil | NiSi (Ni + 4.4Si + 0.1Mg) | Type N negative leg |
| Constantan | CuNi 45/55 | Type J / T / E negative leg |
| Iron | Pure Fe | Type J positive leg |
| Copper | Pure Cu (oxygen-free) | Type T positive leg |
Melting
Vacuum induction melting (VIM) · 500 kg furnace
Composition
Controlled to ±0.1% of specification
Ingot form
Cast ingot / billet · cut-to-length on request
Wire rod size
φ5.5 mm standard · other sizes on request
Certification
EN 10204 3.1 MTC · chemical composition report
Traceability
Unique furnace batch number per melt
Packaging
Wooden crate / pallet · export protected
Frequently Asked Questions
What is the composition tolerance on a vacuum-melted ingot?
±0.1% of specification, verified by optical emission spectroscopy, and supplied with an EN 10204 3.1 MTC and a full chemical composition report.
Which alloys are available as ingot or wire rod?
Seven thermocouple constituent alloys: Chromel, Alumel, Nicrosil, Nisil, Constantan, pure iron and oxygen-free copper.
What is the standard wire rod diameter?
φ5.5 mm hot-rolled rod is standard, ready for downstream precision drawing. Other ingot sizes and rod diameters are available on request.
Can I buy a trial melt?
Yes — trial melts from 5 kg, with production custom melts from 50 kg. Every melt receives a unique furnace batch number and full chemistry records.
Bottom line: Alloy semis are for customers who melt, cast or draw their own wire: seven constituent alloys held to ±0.1% composition, supplied as cast ingot or φ5.5 mm hot-rolled rod, each carrying a furnace batch number and an EN 10204 3.1 MTC.