Amidst the trends toward higher operating frequencies and lightweight design in electric motors, ultra-thin non-oriented silicon steel—specifically grades with a thickness of 0.20 mm or less—is emerging as a core material in fields such as high-speed motors, drones, and high-frequency transformers. As a specialized supplier deeply rooted in the international trade of silicon steel, Wuxi Zhongxin Special Steel maintains a long-standing and stable export business encompassing a comprehensive range of products, including grain-oriented silicon steel, non-oriented silicon steel, and ultra-thin silicon steel. This article systematically outlines the performance characteristics, grade distinctions, and application scenarios of ultra-thin non-oriented silicon steel ranging in thickness from 0.05 mm to 0.20 mm, thereby assisting overseas clients in making rapid and precise material selections.
What is non-oriented ultra-thin silicon steel?
Ultra-thin non-oriented silicon steel refers to cold-rolled non-oriented electrical steel strips (or sheets) with a nominal thickness of ≤0.20 mm. Through extreme thinning, eddy current losses at medium and high frequencies can be significantly suppressed, while simultaneously maintaining isotropic magnetic properties to meet the rigorous requirements of high-speed rotating motors and high-frequency electromagnetic components. Compared to materials of conventional thickness (0.35 mm and 0.50 mm), these ultra-thin specifications demonstrate a remarkably significant advantage in iron loss performance under high-frequency operating conditions.
The Relationship Between Thickness and Performance
The thinner the material, the lower the high-frequency core loss; however, the saturation magnetic induction and lamination factor will decrease slightly, and processing costs will rise accordingly. When selecting a material, it is necessary to strike a balance among core loss, magnetic induction, mechanical strength, and overall cost.
The following is a comprehensive comparison table of thicknesses and grades for non-oriented ultra-thin silicon steel.
| Thickness (mm) | Chinese Grade (GB/Enterprise Standard) | Japanese Grade (JFE/Nippon Steel) | European Grade (EN 10106) | American Grade (ASTM A677) | Typical Core Loss P1.0/400 (W/kg) | Typical Magnetic Induction B50 (T) | Remarks |
| 0.05 | B05A700 | 5JNEX900 | — | — | ≤7.0 | ≥1.58 | Ultra-thin strip; no regular European & American standards, Japanese grades are commonly adopted directly |
| 0.08 | B08A800 | 8JNEX900 | — | — | ≤8.0 | ≥1.60 | Same as above, mainly circulated as enterprise grades |
| 0.10 | B10AT900 / 10JNEX900 | 10JNEX900 | M100-27P series | — | ≤9.0 | ≥1.62 | Mainstream high-frequency grade |
| 0.10 | B10AT1000 | 10JNE1000 series | M100-27P | 64F series | ≤10.0 | ≥1.62 | |
| 0.10 | 10JNRF | 10JNRF (Nippon Steel) | — | — | ≤10.0 | ≥1.62 | Nippon Steel ultra-thin series |
| 0.15 | B15AT1000 | 15JNE1000 | M150-27P | — | ≤10.0 | ≥1.65 | Widely used for UAV motors |
| 0.15 | B15AT1200 | 15JNE1200 | M150-30P | 64F series | ≤12.0 | ≥1.65 | |
| 0.15 | — | 15HX1000 (JFE) | — | — | ≤10.0 | ≥1.64 | High-performance series with lower core loss |
| 0.18 | B18AT1100 | 18JNE1100 series | M180-27P series | — | ≤11.0 | ≥1.65 | Transitional thickness, for die upgrade application |
| 0.20 | B20AT1200 | 20JNE1200 | M200-27P | 47F series | ≤12.0 | ≥1.66 | Largest circulation among ultra-thin specifications |
| 0.20 | B20AT1300 | 20JNE1300 | M200-30P | — | ≤13.0 | ≥1.66 | |
| 0.20 | B20AT1500 | 20JNE1500 | M200-35P | — | ≤15.0 | ≥1.66 | |
| 0.20 | — | 20HX1200 (JFE) | — | — | ≤12.0 | ≥1.65 | High-performance series |
- 0.05mm Ultra-Thin Strip: Typically supplied in the form of narrow strips or slit coils. Minimum order quantities and lead times differ from those of standard specifications; we recommend communicating your specific requirements regarding width and coil weight in advance.
- For all thicknesses, self-adhesive coatings, custom slitting to specific widths, and customized hardness levels are available upon request.
Typical Application Scenarios
- UAV and eVTOL Propulsion Motors: 0.15 mm and 0.10 mm non-oriented ultra-thin silicon steel maintains low core loss at fundamental frequencies up to several kilohertz, delivering high rotational speed, high torque density and low heat generation.
- High-speed Spindle Motors and Compressors: Materials of 0.20 mm, 0.18 mm and 0.15 mm reduce core loss by over 30% compared with conventional 0.35 mm silicon steel, greatly improving energy efficiency.
- New Energy Vehicle Auxiliary Systems: 0.20 mm and 0.18 mm non-oriented ultra-thin silicon steel are increasingly adopted for electric power steering, electric water pump motors and other components to optimize system efficiency.
- High-frequency Power Supplies and Transformers: Ultra-thin gauges of 0.10 mm, 0.08 mm and even 0.05 mm effectively support power conversion from several kilohertz to tens of kilohertz and drastically downsize core dimensions.
- Precision Medical & Aerospace Industries: 0.05 mm and 0.08 mm ultra-thin strips feature extremely low high-frequency loss and excellent workability, ideal for special motors, sensors and ultra-high frequency transformers.
| Industry | Typical Products | Recommended Thickness (mm) |
| New Energy Vehicles | Auxiliary motors, water pumps, oil pumps | 0.20 / 0.18 |
| New Energy Vehicles | On-board OBC / DC-DC transformers | 0.10 / 0.08 |
| UAV | Consumer & industrial grade motors | 0.15 / 0.10 |
| eVTOL | Propulsion motors | 0.10 |
| High-speed Motors | Electric spindles, electric turbines | 0.20 / 0.15 / 0.10 |
| Industrial Power Supplies | High-frequency transformers, reactors | 0.10 / 0.08 / 0.05 |
| Medical Equipment | High-speed dental drills, surgical drills, centrifuges | 0.10 / 0.08 |
| Precision Instruments | Sensors, instrument transformers | 0.05 |
| Aerospace | Actuators, special transformers | 0.08 / 0.05 |
Why Choose Wuxi Zhongxin Special Steel?
- Complete product range down to 0.05 mmWe keep regular stock of non-oriented ultra-thin silicon steel coils and cut sheets in 0.20 mm, 0.18 mm, 0.15 mm and 0.10 mm. 0.08 mm and 0.05 mm materials are available for project-specific customization to meet full-range ultra-thin requirements.
- Diverse grades & flexible trial ordersWe provide one-stop supply covering cost-effective domestic grades as well as high-performance materials compliant with Japanese and European standards. Small-batch mixed orders are supported for trial runs to minimize your inventory risks.
- Professional export packaging & documentationReinforced moisture-proof and rust-proof packaging is applied for sea and air transportation. We supply original mill certificates, chemical composition reports and magnetic performance curves, and can cooperate with third-party inspections upon request.
- Technical support for high-frequency applicationsOur professional team can analyze stack thickness, magnetic circuit and operating frequency of your prototypes, and recommend the most cost-effective combination of thickness and steel grades.
Get Your Quotation for Non-oriented Ultra-thin Silicon Steel Now
Whether you need 0.2 mm coils for trial production or bulk purchase of 0.05 mm ultra-thin silicon steel cut sheets, please send us your drawings or grade requirements. We will provide detailed quotation and delivery schedule within 24 hours.