1370 Aluminum coil sheet 9.5mm 12mm
When people talk about aluminum products, the conversation often gravitates toward strength, corrosion resistance, or surface finish. Yet 1370 aluminum coil sheet in 9.5mm and 12mm thickness belongs to a more specialized world, where the most valuable property is not simply mechanical performance, but electrical purity. This alloy is less about being a structural hero and more about becoming an efficient pathway for energy. From transformer windings to electrical bus conductors, 1370 aluminum serves industries that need conductivity, formability, and reliable processing in one package.
What makes 1370 aluminum particularly interesting is that it sits at the intersection of metallurgy and electrical engineering. It is a commercially pure wrought aluminum alloy, designed primarily for high electrical conductivity. In practical terms, that means the material is chosen not because it is the hardest or strongest option, but because it minimizes resistance while still being workable enough to roll, slit, bend, or fabricate into usable components. In 9.5mm and 12mm coil sheet formats, it enters applications that demand more substance than foil or thin strip, yet still require the continuity and efficiency of coil processing.
A distinctive way to understand 1370 aluminum is to think of it as an alloy that deliberately avoids excess. Unlike heavily alloyed grades such as 5052, 5083, or 6061, 1370 contains very high aluminum content and tightly controlled impurity levels. The purpose is clear: every additional alloying element can interfere with conductivity. So the chemistry is kept clean, and the production route is tuned to preserve that advantage.
Below is a typical chemical composition reference for 1370 aluminum alloy. Actual values may vary slightly by producer and applicable specification.
| Element | Content (%) |
|---|---|
| Aluminum (Al) | 99.70 min |
| Silicon (Si) | 0.10 max |
| Iron (Fe) | 0.20 max |
| Copper (Cu) | 0.05 max |
| Manganese (Mn) | 0.01 max |
| Magnesium (Mg) | 0.01 max |
| Zinc (Zn) | 0.05 max |
| Vanadium (V) | 0.05 max |
| Other each | 0.03 max |
| Other total | 0.10 max |
This chemistry explains why 1370 is often associated with EC grade aluminum, meaning electrical conductor grade. The metal offers conductivity typically around 61 to 62% IACS in annealed condition, sometimes higher depending on processing control. That level is highly valuable in electrical applications where weight savings over copper can compensate for lower absolute conductivity. Aluminum is lighter, easier to handle in long lengths, and often more economical on a conductivity-per-unit-weight basis.
The thicknesses 9.5mm and 12mm deserve special attention because they suggest a product serving demanding downstream operations. These gauges are substantial enough for cutting into pads, bus plates, electrical connectors, and heavy-duty conductor components. At the same time, being supplied in coil form offers manufacturing flexibility. Coil allows continuous feeding in stamping, slitting, and roll-forming lines, reducing scrap and improving productivity compared with discrete plate in certain production environments.
From a features perspective, the first defining trait is high electrical conductivity. This is the reason 1370 exists as a commercial choice. It is widely used where current transfer efficiency matters, and where engineers must balance conductivity, weight, and cost. In substations, transformers, switchgear, and conductor systems, 1370 provides a dependable conductive base material.
The second feature is excellent formability, especially in soft tempers. 1370 is commonly supplied in tempers such as O, H12, H14, H16, or H18 depending on the required balance between strength and ductility. For thicker coil sheet such as 9.5mm and 12mm, O temper is often attractive when bending or shaping is required, while strain-hardened tempers may be selected where higher tensile properties and dimensional stability are needed.
A general reference for mechanical and physical properties is shown below. Values are typical and should be confirmed against mill test certificates and applicable standards for procurement.
| Property | 1370-O | 1370-H14 |
|---|---|---|
| Tensile strength, MPa | 60–95 | 95–125 |
| Yield strength, MPa | 20–40 | 75–110 |
| Elongation, % | 20–35 | 4–10 |
| Electrical conductivity, % IACS | 61–62+ | 59–61 |
| Density, g/cm³ | 2.70 | 2.70 |
| Thermal conductivity, W/m·K | 220–235 | 210–230 |
| Melting range, °C | about 643–657 | about 643–657 |
One subtle but important technical point is the trade-off between conductivity and strength. As aluminum is cold worked, its strength increases, but conductivity can decrease slightly. This means material selection is not only about alloy grade but also about temper condition. In electrical systems carrying high current, even a modest conductivity difference can matter. In fabricated conductor parts subject to handling loads, however, extra strength may be necessary. The best solution is often found not in choosing the "strongest" sheet, but in choosing the right temper for the real service environment.
Surface quality is another practical advantage. Because 1370 coil sheet is often destined for electrical contact applications, consistent surface finish and low contamination are important. Oxide behavior, flatness, edge condition, and residual rolling lubricants can influence subsequent welding, brazing, cladding, or joining performance. For busbar and connector fabrication, processors often request tight tolerances on thickness, width, and camber, especially when the material will be laminated or precision-cut.
In terms of implementation standards, 1370 aluminum products are usually manufactured and inspected in alignment with recognized international or industry specifications, depending on end use and region. Common references may include ASTM B209 for aluminum and aluminum-alloy sheet and plate, ASTM B230 for electrical conductor applications, EN standards for chemical composition and wrought product tolerances, and customer-specific utility or transformer manufacturer specifications. For electrical-grade material, conductivity verification, chemical composition control, and dimensional consistency are often more critical than decorative appearance.
Applications of 1370 aluminum coil sheet in 9.5mm and 12mm thickness reveal its true industrial character. In transformer manufacturing, this alloy is used for winding stock, connector strips, and conductive components where low resistance and manageable weight improve system efficiency. In busbar production, it can be cut and machined into power distribution elements for switchboards, renewable energy systems, and industrial electrical panels. In overhead and grounding-related conductor components, 1370 offers a good combination of conductivity and corrosion resistance in atmospheric conditions.
It also finds use in EV charging infrastructure, power conversion equipment, and energy storage systems, where the shift toward electrification is creating fresh demand for conductive aluminum products. Here, 1370 plays an understated but crucial role. It is not always visible in the finished system, but it helps determine thermal behavior, current carrying capacity, and overall electrical reliability.
From a fabrication viewpoint, welding and joining require some care. Pure aluminum alloys are generally weldable, but because electrical contact resistance is important in service, joint design and surface preparation matter greatly. Mechanical fastening, TIG or MIG welding with suitable filler selection, and friction-based joining methods may all be considered depending on the assembly. For conductive joints, engineers often focus on minimizing oxide build-up and ensuring stable long-term contact under thermal cycling.
The corrosion resistance of 1370 is generally good in many atmospheric and industrial environments, especially compared with bare steel. However, galvanic considerations should not be ignored when the alloy is connected to copper or other dissimilar metals in humid service. Proper interface design, plating, transition connectors, or protective barriers can significantly improve durability.
Seen from a broader perspective, 1370 aluminum coil sheet is a material for systems, not just parts. Its value is unlocked when conductivity, weight optimization, fabrication efficiency, and dimensional control all matter at once. The 9.5mm and 12mm gauges are especially relevant where the material must do more than carry current passively; it must also survive processing, maintain shape, and fit into demanding electrical assemblies.
In that sense, 1370 is a reminder that performance is not always about brute strength. Sometimes the best material is the one that lets energy move with the least resistance, the least waste, and the greatest practical efficiency. For manufacturers working in power equipment, electrification, and advanced conductor systems, 1370 aluminum coil sheet in 9.5mm and 12mm remains a quietly strategic choice-refined, purposeful, and increasingly relevant in an electric future.
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