This comprehensive A-series grade ladder of Cold-Rolled Non-Grain-Oriented electrical steel (CRNGO)is engineered specifically for rotating machinery, small transformers, and a full spectrum of soft-magnetic applications. Complete multi-mill cross-references (Baosteel, NSC, JFE, TKS, POSCO, AK Steel, etc.) are included.
Available Thicknesses: 0.35 · 0.50 · 0.65 mm
Grade Range: 27 core grades across the A-series
Core Loss Range: 2.10 – 13.00 W/kg
Compliance Standards: GB · JIS · EN · ASTM · KS
01 · Product
Cold-Rolled Non-Grain-Oriented electrical steel (CRNGO steel) is the workhorse soft-magnetic core material of the global electric-machinery industry.
Supplied in nominal thicknesses of 0.35 mm, 0.50 mm, and 0.65 mm, our Standard CRNGO covers the complete A-series grade ladder. This range spans from ultra-low-loss premium grades optimized for high-efficiency EV traction motors and IE4/IE5 industrial motors, through to high-induction economy grades ideal for small transformers, ballasts, welding equipment, and voltage stabilizers.
Every coil is supplied with an insulating surface coating pre-applied at the mill, making it ready for downstream stamping, slitting, and lamination stacking. Because its magnetic properties are isotropic—meaning core loss and permeability are uniform in all rolling directions—CRNGO is the natural choice for rotating machinery, where magnetic flux travels through the lamination in multiple directions.
For procurement and engineering teams already specifying to a familiar mill designation, we provide direct cross-references to all major global producers, including: Baosteel, Nippon Steel (NSC), JFE Steel, ThyssenKrupp (TKS), POSCO, NI & SCo, and AK Steel.
Core Product Features:
27 Full A-Series Grades: Scaling from B35A210 (ultra-low-loss) to B65A1300 (high-induction).
Three Thickness Options: Allows precise selection based on application frequency, efficiency targets, and cost budgets.
Multi-Standard Cross-References: Drop-in equivalents provided for GB/T, JIS, EN, ASTM, and KS standards.
Isotropic Magnetic Properties: Ensures consistent core loss and permeability regardless of stamping orientation.
Pre-Applied Insulation Coating: Inorganic or semi-organic coatings available, eliminating the need for a secondary downstream coating step.
Flexible Supply Formats: Available as master coils, slit coils, cut-to-length sheets, or pre-stamped laminations.
02 · Grade Cross-Reference Tables
Table 1: Thickness 0.35 mm
| Our Grade (Baosteel) | NSC | JFE | TKS | POSCO | NI & SCo | AK Steel |
|---|---|---|---|---|---|---|
| B35A210 | 35H210 | 35JN210 | M210-35A | 35PN210 | — | — |
| B35A230 | 35H230 | 35JN230 | M235-35A | 35PN230 | — | — |
| B35A250 | 35H250 | 35JN250 | M250-35A | 35PN250 | 2413 | M-15 |
| B35A270 | 35H270 | 35JN270 | M270-35A | 35PN270 | 2412 | M-19 |
| B35A300 | 35H300 | 35JN300 | M300-35A | 35PN300 | 2411 | M-22 / M-27 |
| B35A360 | 35H360 | 35JN360 | — | 35PN360 | — | — |
| B35A440 | 35H440 | 35JN440 | — | 35PN455 | — | — |
| B35A550 | — | — | — | 35PN560 | — | — |
Table 2: Thickness 0.50 mm
| Our Grade (Baosteel) | NSC | JFE | TKS | POSCO | NI & SCo | AK Steel |
|---|---|---|---|---|---|---|
| B50A230 | 50H230 | 50JN230 | M230-50A | 50PN230 | — | — |
| B50A250 | 50H250 | 50JN250 | M250-50A | 50PN250 | — | — |
| B50A270 | 50H270 | 50JN270 | M270-50A | 50PN270 | 2414 | — |
| B50A290 | 50H290 | 50JN290 | M290-50A | 50PN290 | 2413 | M-15 |
| B50A310 | 50H310 | 50JN310 | M310-50A | 50PN310 | 2412 | M-19 |
| B50A350 | 50H350 | 50JN350 | M350-50A | 50PN350 | — | M-22 |
| B50A400 | — | — | M400-50A | 50PN400 | — | M-27 / M-36 |
| B50A470 | 50H470 | 50JN470 | M470-50A | 50PN445 | 2214 | — |
| B50A600 | 50H600 | 50JN600 | M600-50A | 50PN595 | 2212 | — |
| B50A700 | 50H700 | 50JN700 | M700-50A | 50PN760 | — | M-47 |
| B50A800 | 50H800 | 50JN800 | M800-50A | 50PN890 | 2011 | — |
| B50A1000 | 50H1000 | 50JN1000 | M940-50A | 50PN1015 | — | — |
| B50A1300 | 50H1300 | 50JN1300 | M1100-50A | 50PN1270 | — | — |
Table 3: Thickness 0.65 mm
| Our Grade (Baosteel) | NSC | JFE | TKS | POSCO | NI & SCo | AK Steel |
|---|---|---|---|---|---|---|
| B65A470 | — | — | M470-65A | 65PN470 | — | M-43 |
| B65A600 | — | — | M600-65A | 65PN595 | — | M-45 |
| B65A700 | — | — | M700-65A | 65PN760 | — | — |
| B65A800 | — | 65JN800 | M800-65A | 65PN890 | — | M-47 |
| B65A1000 | — | 65JN1000 | M1000-65A | 65PN1015 | — | — |
| B65A1300 | — | 65JN1300 | M1300-65A | 65PN1270 | — | — |
03 · Magnetic & Physical Properties
A‑series Naming Convention
In the A-series naming convention, performance is encoded directly within the grade designation itself. The numeric portion represents the maximum guaranteed core loss in W/kg × 100, tested at a magnetic induction of 1.5 T and a frequency of 50 Hz.
- B50A470: Max guaranteed core loss ≤ 4.70 W/kg @ 1.5 T, 50 Hz.
- B35A250: Max guaranteed core loss ≤ 2.50 W/kg @ 1.5 T, 50 Hz.
- B65A800: Max guaranteed core loss ≤ 8.00 W/kg @ 1.5 T, 50 Hz.
Technical Grade Selection Logic
Lower core-loss grades use higher silicon content (typically 2.5 – 3.5% Si), generating significantly less heat under AC magnetization, though they deliver slightly lower magnetic induction (B50). Conversely, higher-loss / higher-induction grades use lower silicon content (typically 0.5 – 1.5% Si) and are preferred where lamination space is plentiful and material budget outweighs absolute efficiency.
General Technical Specifications
| Property | Test Condition | Typical Range |
|---|---|---|
| Maximum Core Loss P1.5/50 | 1.5 T, 50 Hz | 2.10 – 13.00 W/kg (grade-dependent) |
| Magnetic Induction B50 | H = 5000 A/m | 1.60 – 1.78 T (grade-dependent) |
| Lamination Stacking Factor | — | ≥ 95 – 97% |
| Surface Insulation Coating | — | Inorganic / Semi-organic |
| Yield Strength (Rp0.2) | — | 300 – 470 MPa |
| Standard Widths | — | 1000 / 1200 / 1250 mm |
04 · Typical Applications
Section A: Rotating Machinery
| Application | Recommended Grade Range | Notes |
|---|---|---|
| Large Motors (> 100 kW) | A230 – A400 | Prioritizes lowest core loss and maximum efficiency. |
| Medium Industrial Motors | A230 – A700 | Delivers a balanced sweet spot between energy loss and cost. |
| Compressor Motors | A230 – A1300 | Full range applicable, depending on duty cycle and efficiency tier. |
| General-Purpose AC Motors | A230 – A1300 | Core volume market demand sits between A400 – A800. |
| Precision / Servo Motors | A230 – A1300 | 0.35 mm is highly preferred to accommodate high-frequency stators. |
| EV Traction Motors | A230 – A400 (0.35 mm) | Low core loss is critical under high PWM harmonic frequencies. |
Section B: Static Apparatus
- Small Power-Supply Transformers: Compatible with all A-series grades.
- Instrument Transformers: Recommended range A230 – A400.
- Reactors and Magnetic Amplifiers: Recommended range A230 – A400.
- High-Voltage Power Switches: Recommended range A230 – A400.
- Welding Transformers: Recommended range A400 – A1300.
- Voltage Stabilizers / Regulators: Compatible with all A-series grades.
- Magnetic Shielding / Seals: Recommended range A230 – A700.
- Accelerator Electromagnets: Recommended range A400 – A700.
05 · Lamination Selection: Three Key Engineering Variables
1.Operating Frequency: Higher operating frequencies demand thinner sheets and lower-loss grades. At 50/60 Hz mains frequency, all three thicknesses are viable. When dealing with 400 Hz aviation systems, high PWM motor harmonics, or high-speed spindles, 0.35 mm sheets become mandatory.
2.Efficiency Target: IE4 / IE5 super-premium motors and EV traction units strictly require low-loss grades (A210 – A400). Standard industrial duty (IE2 / IE3) typically utilizes A470 – A800. Cost-sensitive ballasts, welders, and stabilizers widely implement A800 – A1300.
3.Working Flux Density: High-induction designs that require compact lamination cross-sections necessitate a high B50 value, which favors higher-numbered grades. Designs with generous iron areas can safely use low-loss grades at moderate flux densities.
06 · Insulation Coatings, Formats, and Logistics Insulation Coating Classifications:
Formats: Master coils (full mill width), slit coils (custom widths), cut-to-length sheets, and pre-stamped motor laminations.
Packaging: Coils secured on steel or wooden pallets (Eye Horizontal / Eye Vertical options), wrapped with VCI moisture-resistant paper, and finished with steel strapping and edge protectors.
Logistics: Available under FOB / CFR / CIF terms at major Chinese ports. Standard 20′ GP container loading is standard; break-bulk options are available for large-volume orders.