ASTM Electrical Silicon Steel Coil: CRGO & CRNGO Grades, Specifications and Applications

With the increasing worldwide demand for energy saving power transmission and high performance electrical appliances, ASTM Electrical Silicon Steel Coil has been a necessary material in the production process of transformers, motors and generators. Renowned for its excellent magnetic properties and low core loss, electrical silicon steel (also electrical steel or lamination steel) is instrumental in enhancing energy efficiency across industrial and infrastructure projects around the world.

What Is ASTM Electrical Silicon Steel?

Electrical silicon steel is a special purpose steel alloy, usually with 2%–3.5% of silicon. The presence of silicon also increases the electrical resistivity and reduces the hysteresis loss, which is beneficial for use in electromagnetic applications.

Under the standards of ASTM International, electrical steel coils are classified based on magnetic properties, processing methods, and end-use applications. The two primary categories are:

CRGO Silicon Steel Coil (Cold Rolled Grain Oriented)

Key Features:

  • Excellent magnetic permeability in the rolling direction

  • Extremely low core loss

  • High magnetic flux density

  • Optimized for transformer core manufacturing

Common ASTM Grades:

  • ASTM A876

  • ASTM A677 (Grain-Oriented Types)

Typical Thickness:

  • 0.23 mm

  • 0.27 mm

  • 0.30 mm

  • 0.35 mm

Applications:

  • Power transformers

  • Distribution transformers

  • Large energy transmission equipment

CRNGO Silicon Steel Coil (Cold Rolled Non-Grain Oriented)

Key Features:

  • Uniform magnetic properties in all directions

  • Good mechanical strength

  • Suitable for rotating machinery

  • Cost-effective solution for motor cores

Common ASTM Grades:

  • ASTM A1008 (reference for cold rolled base)

  • ASTM A677 (Non-Oriented Types)

Typical Thickness:

  • 0.35 mm

  • 0.50 mm

  • 0.65 mm

Applications:

  • Electric motors

  • Generators

  • Compressors

  • Automotive motor systems

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CRGO Silicon Steel Coil

CRNGO Silicon Steel Coil

Technical Specifications Overview

Property CRGO CRNGO
Silicon Content 2.9%–3.5% 1.0%–3.0%
Core Loss Very Low Low
Magnetic Direction Single Direction Multi-Directional
Surface Insulation C2 / C5 coating C3 / C5 coating
Delivery Condition Coil / Slit Coil / Sheet Coil / Sheet

 

The inter-laminar strength, eddy current loss and corrosion protection in long term operation are enhanced by applying the surface coating on the composite conductor.

 

Market Demand and Industry Trends

With the rapid development of renewable energy projects, smart grid systems, and electric vehicle production, demand for high-grade electrical steel coils continues to grow in North America, Southeast Asia, Latin America, and Europe.

China Royal Steel offers silicon steel coils of all materials and grades to meet global demand.We provide the best products and services and have extensive export experience. If you are interested in silicon steel coils, please contact us as soon as possible.

China Royal Steel Ltd

Address

Bl20, Shanghecheng, Shuangjie Street, Beichen District, Tianjin, China

E-mail

[email protected]

Phone

+86 13652091506

Post time: Feb-24-2026