JTM/JTMH Series Copper-Magnesium Alloy Stranded Wire
Specifications
| Model | JTM/JTMH |
|---|---|
| Standard | TB/T 3111.1-2026, Stranded conductors for overhead contact system of electrification railway — Part 1: Copper and copper alloy stranded conductors |
| Rated Voltage | For 25kV AC traction power supply systems |
| Design Speed | Up to 350km/h (high-speed messenger wires designed with the JTMH and CTMH pairing) |
| Operating Temperature | -40℃~+70℃ |
| Altitude | <4000m |
| Materials | Copper-magnesium alloy |
| Installation | Installed in the contact suspension system, used with tension compensation devices |
JTM JTMH series copper-magnesium alloy stranded wire
Application: conductor for overhead contact systems of electrified railways
Models: JTM10, JTM16, JTM25, JTM35, JTM50, JTM70, JTM95, JTM120, JTM150, JTMH10, JTMH16, JTMH25, JTMH35, JTMH50, JTMH70, JTMH95, JTMH120, JTMH150
Standard: TB/T 3111.1-2026, Stranded conductors for overhead contact system of electrification railway — Part 1: Copper and copper alloy stranded conductors
Technical parameters: single-wire diameter tolerances per TB/T 3111.1-2026: for wire diameters 0.50mm to 2.50mm (JTM10, JTM16, JTM25, JTM35, JTM50, JTM70, JTM95, JTM150 and the corresponding JTMH types) the tolerance is ±0.02mm; for wire diameters 2.80mm to 3.15mm (JTM120, JTM150-1×19/3.15, etc.) the tolerance is ±0.03mm.
Nominal ultimate tensile force of JTM series copper-magnesium alloy stranded wires (TB/T 3111 series):
| Model | Construction | Ultimate tensile force kN ≥ |
|---|---|---|
| JTM10 | 1×7×(1+6) | 4.75 |
| JTM16 | 1×7×(1+6) | 8.03 |
| JTM16 | 1×7×(3+9) | 8.15 |
| JTM25 | 1×7 | 11.98 |
| JTM35 | 1×7 | 16.97 |
| JTM35 | 1×19 | 17.26 |
| JTM50 | 1×7 | 24.44 |
| JTM50 | 1×19 | 23.88 |
| JTM70 | 1×19 | 32.51 |
| JTM95 | 1×19 | 46.08 |
| JTM120 | 1×19 | 57.79 |
| JTM150 | 1×37 | 72.67 |
Table values are compiled from current national and railway industry standards; ordered parameters are subject to the latest published standard edition and the supply technical agreement.
Nominal ultimate tensile force of JTMH series high-strength copper-magnesium alloy stranded wires (TB/T 3111 series):
| Model | Construction | Ultimate tensile force kN ≥ |
|---|---|---|
| JTMH10 | 1×7×(1+6) | 5.67 |
| JTMH16 | 1×7×(1+6) | 9.58 |
| JTMH16 | 1×7×(3+9) | 9.71 |
| JTMH25 | 1×7 | 14.28 |
| JTMH35 | 1×7 | 20.24 |
| JTMH35 | 1×19 | 20.57 |
| JTMH50 | 1×7 | 29.14 |
| JTMH50 | 1×19 | 28.48 |
| JTMH70 | 1×19 | 38.76 |
| JTMH95 | 1×19 | 54.94 |
| JTMH120 | 1×19 | 68.91 |
| JTMH150 | 1×37 | 86.65 |
Table values are compiled from current national and railway industry standards; ordered parameters are subject to the latest published standard edition and the supply technical agreement.
Product Overview
JTM JTMH series copper-magnesium alloy stranded wires produced by Henan Chuangwit Railway Equipment Co., Ltd. combine high strength with high conductivity for electrified railway OCS messenger wires, offering good fatigue resistance and long service life.
Key Features
- Multiple alloy systems cover different speed and tension classes
- Balances high conductivity with high strength
- Wear-resistant and fatigue-resistant with a long service life
- Supplied to match the tension system of TB/T 3111.1-2026
Compliance & Quality Control
The product complies with TB/T 3111.1-2026, Stranded conductors for overhead contact system of electrification railway — Part 1: Copper and copper alloy stranded conductors; tensile strength and elongation meet the standard tension system, with uniform stranding and fatigue resistance. Conductivity is at least 80% IACS for JTM and at least 75% IACS for JTMH (copper-magnesium alloy), and ampacity satisfies traction power supply calculations. The company holds CRCC railway product certification and ISO9001 quality management system certification; every reel (batch) is delivered only after passing factory inspection.
Operating Conditions & Typical Applications
Suitable for high-speed, conventional-speed and urban rail OCS, enduring long-term current loading, vibration and atmospheric corrosion. Typical applications include high-speed railways, conventional and heavy-haul railways, urban rail transit and coastal corrosive environments.
Selection & Service
We provide selection verification and non-standard customization based on line conditions and operating parameters. Products follow CRCC railway product certification and ISO9001 quality management system requirements; key parameters are verified by factory inspection and type tests. For selection consulting and quotations, please call 0375-6051688.
Performance
Operating Conditions
Suitable for high-speed, conventional-speed and urban rail OCS, enduring long-term current loading, vibration and atmospheric corrosion.
Mechanical Performance
Tensile strength and elongation meet TB/T 3111.1-2026; uniform stranding with fatigue resistance.Electrical Performance
Conductivity JTM at least 80% IACS, JTMH at least 75% IACS (copper-magnesium alloy); ampacity satisfies traction power supply calculations.Applications
High-Speed Railways
JTM JTMH series copper-magnesium alloy stranded wires are used in high-speed line contact suspensions, meeting high-speed current collection and high-tension requirements.
Conventional & Heavy-Haul Railways
JTM JTMH series copper-magnesium alloy stranded wires serve as messenger wires on conventional and heavy-haul lines; fatigue resistance suits heavy loads.
Urban Rail Transit
JTM JTMH series copper-magnesium alloy stranded wires are used in urban rail OCS, balancing current capacity and mechanical strength.
Coastal Corrosive Environments
Copper and copper alloy stranded wires offer good atmospheric corrosion resistance for coastal and industrially polluted environments.
