Cold-rolled non-oriented (NGO) and grain-oriented (GO) electrical steel coils for motors, generators and transformer cores. Compare grades by magnetic loss, induction, gauge and insulation coating before you order.
Send the grade or required P15/50 / P17/50 loss value, thickness, strip width, coating, coil ID, tonnage and destination. We will review the supply specification and quote your requested lot.
View grades & gauges ↓Electrical steel selection starts with flux direction and the finished core. Non-oriented material is commonly selected for rotating machines; grain-oriented material is optimized for transformer flux along the rolling direction.
Designed for alternating magnetic flux across multiple in-plane directions. Widely specified for motors, generators, compressors and stator/rotor laminations. Order the exact loss class, nominal thickness, coating and delivered condition.
See NGO reference grades ↗Processed to achieve favorable magnetic properties in the rolling direction. Used primarily for transformer and reactor cores; specify the required loss at a stated test induction, grade class and coating.
See GO reference grades ↗Material supplied in its final annealed condition. Magnetic properties are assessed under the agreed standard and test method; lamination processing still requires controls for burr, coating and residual stress.
Where specifically ordered, the purchaser carries out additional annealing to develop the specified magnetic properties. Procurement requirements differ from fully processed material, including heat treatment and test basis.
A magnetic steel RFQ needs more than a steel grade and thickness. State the magnetic performance, coating and coil geometry that your cutting or winding line requires.
| Steel category | Fully processed NGO / GO electrical steel; semi-processed NGO upon specific enquiry |
| Product form | Cold-rolled master coil, slit coil or cut sheet by agreement |
| Grades | GB 35W / 50W / 65W series; GO Q / QG series; EN M-series; ASTM material classes by relevant standard |
| Thickness | NGO: common 0.35 / 0.50 / 0.65 mm; GO: common 0.23 / 0.27 / 0.30 / 0.35 mm; other nominal gauges by specified product standard |
| Coil width | Mill width or slit width according to ordered product and confirmed supply route |
| Magnetic properties | Specific total loss (W/kg) and induction/permeability at the specified test conditions |
| Insulation coating | Specified coating class, interlaminar resistance and processing compatibility |
| Coil geometry | Inner diameter, outer diameter limit, coil mass, winding direction and edge condition |
| Delivery & inspection | Fully processed / semi-processed state, grade traceability, magnetic test report and inspection scope |
| Order information | Standard edition, exact grade, thickness, width, coating, coil ID, quantity and shipping destination |
To compare supply options, include material grade and the test conditions behind the performance value.
Compare test reports using the same induction and frequency. A quoted loss value at 1.5 T / 50 Hz is not directly interchangeable with one measured at 1.7 T / 50 Hz.
Specify the allowable loss at the defined flux density and frequency, such as P15/50 for many NGO orders or P17/50 for GO orders.
Check induction or permeability at the specified magnetizing field and test method, especially when comparing transformer grades.
Coating class, lamination factor, flatness, edge condition and processing history influence the final assembled core.
Magnetic measurements depend on the standard method, flux density, frequency and specimen state. Core loss must be compared within the same measurement basis; coating properties and cutting stresses can affect downstream core performance.
The appropriate standard depends on whether the coil is non-oriented, grain-oriented, fully processed or semi-processed. Your purchase order should name the edition and any supplementary requirements.
Fully processed non-oriented cold-rolled electrical steel strip and sheet; active edition as of October 2026.
Fully processed grain-oriented cold-rolled electrical steel; implemented March 2026.
Fully processed non-oriented electrical steel. A 2026 replacement draft is under review, not the published standard.
Fully processed grain-oriented electrical strip and sheet, including conventional and high-permeability groups.
Fully processed non-oriented electrical steel; ASTM A683-16(2023) separately covers semi-processed types.
Fully processed grain-oriented electrical steel; insulation coating classification via ASTM A976-18(2026).
IEC references: IEC 60404-8-4:2022 + Amendment 1:2026 (fully processed NGO); IEC 60404-8-7:2020 (fully processed GO). Final technical acceptance follows the exact standard, edition and grade agreed in your contract.
Reference designations help you prepare an enquiry. Codes from GB and EN are distinct designation systems; confirm full magnetic properties and coating before comparing suppliers.
Example grade requests · nominal thickness in mm
| Type | Grade example | Gauge (mm) | Specification family | Typical core use | Estimate |
|---|---|---|---|---|---|
| NGO | 35W300 | 0.35 | GB/T 2521.1 | Motor and generator core laminations | |
| NGO | 50W470 | 0.50 | GB/T 2521.1 | Stator and rotor lamination stock | |
| NGO | 50W600 | 0.50 | GB/T 2521.1 | General motor core stock | |
| NGO | 65W800 | 0.65 | GB/T 2521.1 | Specified magnetic device cores | |
| NGO | M270-35A | 0.35 | EN 10106 | European NGO lamination grade | |
| NGO | M400-50A | 0.50 | EN 10106 | European NGO lamination grade | |
| GO | 27Q120 | 0.27 | GB/T 2521.2 | Conventional GO transformer core material | |
| GO | 30Q130 | 0.30 | GB/T 2521.2 | Conventional GO transformer core material | |
| GO | 35Q155 | 0.35 | GB/T 2521.2 | Conventional GO transformer core material | |
| GO | 23QG090 | 0.23 | GB/T 2521.2 | High-induction GO transformer grade |
Grades and gauges are reference examples for enquiry preparation, not a live stock list or a cross-standard equivalence table. The loss and induction requirements are defined by the ordered grade and relevant test method; supplier-specific coil widths and coating options must be reconfirmed.
Match strip properties to the electromagnetic design and your punching, slitting or winding process.
Non-oriented electrical steel is commonly selected for rotating-machine core stacks. Specify grade, gauge, loss, coating, strip width and stamping conditions for the lamination geometry.
Grain-oriented electrical steel is used for transformer and reactor magnetic paths. The order should state rolling direction, loss class, thickness, coating and cutting or winding requirements.
NGO core stock for stators and rotors, subject to the machine's magnetic loss and punching requirements.
Non-oriented grades selected by duty cycle, frequency, gauge and the lamination design.
GO grades specified for core-loss target, magnetic induction and manufacturing direction.
Estimate the theoretical strip length from nominal thickness, width and mass per coil. Useful for planning slitting, stamping and unloading; it is not a magnetic performance or net shipment weight guarantee.
Choose a grade or gauge to fill the thickness. Density is an editable planning input because it varies by material chemistry and grade.
A strip's theoretical weight per metre is calculated from its flat cross section and nominal material density. Coating weight, gauge tolerance, winding gaps and packaging are outside this estimate.
kg/m = thickness(mm) × width(mm) × density(g/cm³) ÷ 1000
Length (m) = coil mass (kg) ÷ kg/m
Coordinate specification review, grade sourcing, inspection documentation and export packing with one B2B steel supply team. Factory-scale figures shown above apply to the company overall.
BAOSTEEL METAL company-wide manufacturing and stocking resources support coordinated steel procurement programmes.
Explore manufacturing ↗Provide NGO or GO grades with loss, induction, coating and tolerance criteria for a documented supply check.
Agree on certificate type, magnetic test results, material identification and visual inspection before order confirmation.
Quality control ↗Specify coil mass, inner diameter, moisture barriers, unloading constraints and destination during quotation.
Electrical steel is produced with tightly managed composition, rolling and heat treatment. The final magnetic properties depend on the production route, grain structure, annealing and surface insulation.
For magnetic core materials, the material certificate should identify the ordered grade and report the required test properties under the applicable specification. Agree any supplementary inspection before production or dispatch.
Coating selection affects interlaminar insulation, punchability and subsequent core processing. Request the required coating category and specific resistance or compatibility criteria when those properties matter.
ASTM A976 classification provides a framework for coating chemistry and application. The ordered product standard controls specific acceptance criteria.
Define coil width tolerance, edge burr limits, edge camber and winding alignment before arranging slit coils.
State intended stamping, laser cutting, bonding or annealing steps so coating and material conditions can be checked for compatibility.
Core-material coils require careful handling to protect thin edges and the insulation surface. Confirm packaging with the supplied width, mass and shipping method.
Keep optional preparation tied to the magnetic grade and coating. Where slitting or cut-to-length is requested, the cut edge and handling condition matter as much as the nominal dimensions.
Explore other flat-rolled steel categories or ask for a consolidated quotation by grade, width, coating and shipment date.
Non-oriented electrical steel is selected for cores with changing magnetic flux direction, such as rotating electric machines. Grain-oriented electrical steel has favorable properties along its rolling direction and is principally used for transformer cores. Choose according to the magnetic circuit and the stated standard.
Common fully processed NGO gauges include 0.35, 0.50 and 0.65 mm. Common GO gauges include 0.23, 0.27, 0.30 and 0.35 mm. The available grade/gauge combination depends on the standard and confirmed supply.
These notations refer to specific total core loss measured under stated magnetic test conditions: 1.5 T at 50 Hz or 1.7 T at 50 Hz respectively. Compare test results using the same measurement basis.
Motor laminations commonly require non-oriented electrical steel because magnetic flux changes direction through the core. Grain-oriented grades serve directional magnetic paths. Material selection must match the approved core design and loss requirements.
Fully processed electrical steel is delivered in its final annealed magnetic condition under the specified product standard. Semi-processed steel requires additional customer heat treatment to develop the required properties.
Slit coil can be discussed with the required strip width, tolerance, edge-burr limit, coating and coil ID. Availability and technical feasibility are confirmed for the requested grade and quantity.
State required grade identification, thickness/width tolerances, magnetic loss, induction or permeability test conditions, coating properties and any third-party inspection. Documentation follows the ordered standard and contract.
Send NGO or GO type, standard and edition, exact grade, nominal gauge, strip width, coating, coil ID/OD limits, mass per coil, total tonnage, destination and required magnetic test data.
Share your NGO or GO grade, loss and induction requirement, thickness, width, coating, coil mass, quantity and delivery destination. Our team can check the specification and available supply arrangement for your order.
Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.
