Non-Grain Oriented Silicon Electrical Steel

We supply a full range of cold rolled non-oriented silicon steel products sourced from leading steel mills.

SUMMARY
OVERVIEW

Thickness	0.20, 0.25, 0.27, 0.30, 0.35, 0.50, 0.65mm
Inner Coil Dia.	508 ± 10mm
Width	1000 – 1230mm
Surface	ASTM A677, A677M thin C5(default), C3, C6
Thickness Tol.	0.008 – 0.035mm depends on sheet thickness.
Environmental Protection	Compliant with the EU RoHS and REACH requirements for restricted hazardous substances.
Grades	50W1300, 50W800, 50W600, 50W470, 50W400, 50WH600, 50WH470;
	35W440, 35W550

Introduction

Cold-rolled non-oriented silicon steel (CRNGO) is a type of steel with a high silicon content, widely used in the production of core materials for electric motors, generators, and transformers. Its key features include low hysteresis loss, high magnetic permeability, and excellent oxidation resistance, making it ideal for energy-efficient and high-performance electromagnetic applications.

What is Cold Rolled Non-oriented Silicon Steel

Cold-rolled non-oriented silicon steel is produced through a cold rolling process, resulting in steel with a silicon content between 2% and 3.5%. The grains of the steel are not oriented in any specific direction, giving the material isotropic magnetic properties. Compared to grain-oriented silicon steel (GO Steel), CRNGO exhibits more uniform magnetic permeability in all directions, making it suitable for general electromagnetic applications.

Production Process of CRNGO

The production process of CRNGO includes the following steps:

Steel Refining:
The steel is refined using an electric arc furnace or a converter to adjust the chemical composition and add alloying elements such as silicon and aluminum to improve magnetic properties
Casting and Rolling:
The molten steel is cast into slabs and then hot-rolled to reduce thickness. The hot-rolled sheets are further processed through cold rolling to enhance surface quality and dimensional accuracy.
Annealing:
The cold-rolled steel is annealed to relieve internal stress and improve magnetic properties. Annealing is typically performed in a hydrogen-protected atmosphere to enhance the material’s soft magnetic performance.
Coating:
A thin insulating coating is applied to the steel surface to improve oxidation resistance, reduce energy loss, and enhance magnetic permeability.

Classification of CRNGO

CRNGO is classified based on its magnetic properties into:

Standard type – Balanced magnetic properties for general applications.
High permeability type – Enhanced magnetic properties for improved efficiency.
Super high permeability type – Premium magnetic performance for high-efficiency applications.

Standards for CRNGO

CRNGO is manufactured in compliance with both national and international standards, including:

Chinese Standard:
- GB/T 2521 – Specifies the specifications, technical requirements, and testing methods for CRNGO in China.
American Standard:
- ASTM A677 – Defines the chemical composition, mechanical properties, and magnetic performance requirements for CRNGO in the United States.

Advantages of CRNGO

Feature	Advantages	Disadvantages
Magnetic Properties	– Magnetically isotropic, suitable for rotating equipment (e.g., motors, generators). – Moderate magnetic permeability reduces energy loss.	– Magnetic performance is inferior to cold-rolled grain-oriented silicon steel, especially in specific directions.
Surface Quality	– Smooth surface with few defects, suitable for applying insulation coatings to enhance electrical performance.	– Requires additional surface treatment to improve oxidation and corrosion resistance; otherwise, performance may degrade over time.
Electrical Performance	– Low iron loss, contributing to improved efficiency in motors and transformers.	– Slightly higher iron loss compared to cold-rolled grain-oriented silicon steel, particularly less efficient in fixed directional magnetic fields.
Application Flexibility	– Non-oriented properties ensure uniform performance in all directions, meeting diverse electromagnetic equipment requirements.	– Cannot fully meet the specific needs of high-efficiency or precision equipment compared to grain-oriented silicon steel.

Applications of CRNGO

Due to its excellent magnetic and mechanical properties, CRNGO is widely used in various industries, including:

Electric Motors:
- Used in the stator and rotor cores of various electric motors, particularly in high-efficiency models.
Transformers:
- Used in transformer cores to reduce energy loss and enhance operational efficiency.
Generators:
- High-performance generator core material.
Home Appliances:
- Used in electric motors for air conditioners, refrigerators, and washing machines.
Electrical Equipment:
- Applied in the cores of high-performance electrical devices.

Summary

Cold-rolled non-oriented silicon steel is a high-performance magnetic material with excellent magnetic, mechanical, and processing properties. It plays a critical role in the production of high-efficiency electric motors, transformers, and other electrical equipment, contributing to improved energy efficiency and performance.

Warehouses

Workability

HK Hantie’s laminated metal products are versatile in processing, offering capabilities such as deep drawing, steel sheet punching, V-bending, 180° bending, printing, CNC engraving, and custom requests.
We also provide cutting services for film-coated glass to meet customer needs.

T bending

punching

printing

embossed effect

CNC engraving

180 degree bending

Packing & Delivery

Export packaging or customized packaging as per customer requirements, with reinforced protection during shipment to ensure product stability.

FAQ

How do you ensure the quality of the steel?

We strictly select suppliers that meet the required standards and control the dimensional tolerances within the standard range. Mill’s testing certificate upon export will be provided to our customer. Additionally, at customer’s request, we can arrange third-party inspection and certificate of conformity will be issued.

What payment methods do you accept for steel orders?

For product orders, we accept payment methods such as L/C, T/T, and others.

Does your company keep stock of steel materials, and can customers order locally?

We maintain stock for commonly used materials, such as SA516 Gr70N, to ensure fast delivery. For specific grades and specifications, please consult us. In addition to our warehouse in China, we also have a warehouse in Vietnam, which enables us to provide fast delivery to nearby regions.

How can I avoid the impact of price fluctuations?

Steel, being a bulk commodity, is subject to frequent price fluctuations, which can affect customer cost control. For long-term agreement customers, we offer price locking options, with periods such as one quarter or one year.

Is there a minimum order quantity (MOQ)?

There is no MOQ for regular products. For agreement-based products, the minimum order will depend on the steel mill’s production schedule.

What is the process for handling quality disputes?

If customers find discrepancies between the received goods and the contract or technical agreement, they can raise the issue with us. After an initial review, we will submit a quality dispute to the steel mill. Both the steel mill and our representatives or a third-party inspector will verify the issue, and compensation will be provided once verified.

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