Non-oriented · High-strength grades
High-Strength CRNGO for EV Traction MotorsHigh-yield-strength non-oriented silicon steel for high-speed rotor cores
Standard non-oriented steel isn’t built to survive the centrifugal stress of a 15,000–20,000 rpm rotor. Our high-strength CRNGO grades hold yield strength up to 450 MPa while keeping core loss low, in gauges from 0.20 to 0.35 mm — for EV traction motors, servo drives and drone motors.
Why high-strength CRNGO
Built for rotors that spin, not just cores that sit still
A distribution transformer core never moves. A traction motor rotor does — at speeds that put ordinary non-oriented steel at risk of yielding under its own centrifugal load. High-strength CRNGO trades a small amount of formability for mechanical strength, without giving up magnetic performance.
High rotational strength
Yield strength Rp0.2 from 400 to 450 MPa resists deformation at high rotor tip speed.
Low loss at operating frequency
Core loss is tuned for the motor’s real electrical frequency, not just the 50 Hz test point.
Thin-gauge options
Down to 0.20 mm to cut eddy-current loss as rotor speed and pole-pass frequency rise.
Precision slitting & stamping
Slit to your rotor lamination width, with mechanical properties held tight across the coil.
Grades
High-strength non-oriented grades we supply
Three grades cover most EV, servo and drone rotor programs. Values below are typical published ranges — confirm against the mill test certificate for your order before specifying.
| Grade | Thickness | Yield strength Rp0.2 | Core loss P1.5/50 | Typical use |
|---|---|---|---|---|
| 20SW1200H | 0.20 mm | ≥ 420 MPa | ≤ 12.0 W/kg | High-speed EV / servo rotor |
| B20AHV1500 | 0.20 mm | ≥ 450 MPa | ≤ 15.0 W/kg | Ultra-high-speed rotor, drone motor |
| B27AHV | 0.27 mm | ≥ 400 MPa | ≤ 13.5 W/kg | High-speed traction motor rotor |
Need standard-strength non-oriented steel instead? Standard CRNGO covers 0.35–0.65 mm grades like 50W470 and 50W600 — see the standard range →
By application
Where high-strength CRNGO earns its keep
EV traction motor rotors
High-speed rotor cores in permanent-magnet and induction traction motors.
Explore →High-speed servo motors
Compact servo rotors running at high pole-pass frequency.
Drone & UAV motors
Lightweight, high-rpm outrunner and inrunner motor cores.
High-speed industrial motors
Compressor and turbo-blower motors above standard line speed.
Explore the range
The rest of our silicon steel line
Non-oriented · Standard
Standard CRNGO
50W470, 50W600 and 50W800 in 0.35–0.65 mm, for general motor and appliance laminations.
View standard CRNGO →
Non-oriented · Overview
Non-Oriented Silicon Steel
The full non-oriented line — standard, high-strength and ultra-thin — in one place.
View non-oriented hub →
Grain-oriented · CRGO
Grain-Oriented Silicon Steel
CRGO for power and distribution transformer cores, M4–M6 and Hi-B grades.
View grain-oriented →FAQ
Sourcing high-strength CRNGO
What makes “high-strength” non-oriented steel different from standard CRNGO?
It’s alloyed and processed to raise yield strength well above standard grades — 400–450 MPa versus roughly 300–350 MPa for standard CRNGO — so the lamination can survive the centrifugal stress of a fast-spinning rotor without permanent deformation.
Why do EV traction motors need higher-strength steel?
Traction motor rotors can spin at 15,000 rpm or more. The stress on the lamination rises with the square of rotor speed, so a rotor built from standard-strength steel can yield or crack at speeds a high-strength grade handles safely.
What thicknesses do you supply for high-strength CRNGO?
0.20, 0.27 and 0.35 mm are standard for these grades. Thinner gauges reduce eddy-current loss as pole-pass frequency rises with rotor speed.
Can you match grades like 20SW1200H or B27AHV?
Yes — send us the grade or a datasheet and we’ll confirm the match, or recommend an equivalent grade if an exact match isn’t available.
Do you test core loss at high frequency, not just 50 Hz?
Yes — for high-speed motor programs we can test and report core loss at your actual operating frequency in addition to the standard 50 Hz figure.
What’s the minimum order quantity and lead time?
MOQ and lead time depend on grade, thickness and width. Tell us your target volume and program timeline and we’ll confirm what’s workable, including trial quantities for new rotor designs.
Why buyers choose Zhongxin
Mill-grade material, export-ready service
Wuxi Zhongxin Special Steel Co., Ltd. is a Chinese manufacturer and exporter of grain-oriented, non-oriented and ultra-thin silicon steel, serving transformer and motor makers across Europe, the Americas, Asia and beyond.
Send your rotor spec — get a quote in 24 hours
Share grade, thickness, width and target rotor speed, or upload a drawing. Free samples available.
