BIS Certification for Grain oriented electrical steel sheet & strip (CRGO) IS 3024:2015

Grain-oriented electrical steel sheet and strip (CRGO) are specialized materials used primarily in the manufacturing of transformers and large electrical machines. These sheets are designed with a grain structure that enhances their magnetic properties in a specific direction, significantly reducing energy losses and improving efficiency. CRGO steel is known for its high magnetic permeability and low core loss, making it ideal for applications requiring efficient magnetic flux conduction. Its superior performance characteristics help in minimizing energy wastage and improving the overall functionality and reliability of electrical devices, making it an indispensable material in the energy sector.

Importance of BIS Certification

BIS certification is crucial for Grain Oriented Electrical Steel Sheet & Strip (CRGO) to ensure adherence to stringent quality and safety standards set by the Bureau of Indian Standards. This certification guarantees that CRGO sheets meet essential criteria such as magnetic properties, core loss, and dimensional accuracy, critical for their efficient performance in transformers and electrical machines. By complying with BIS standards, manufacturers ensure that CRGO products provide reliable magnetic characteristics, minimize energy losses, and enhance the overall efficiency of electrical equipment. Certification also fosters consumer confidence, ensures regulatory compliance, and promotes the use of high-quality materials in the electrical industry, contributing to safer and more efficient electrical infrastructure.

Indian Standard IS 3024:2015

As per the latest Quality Control Order (QCO) issued by the Ministry of Steel, Government of India on 5th February 2024, Grain Oriented Electrical Steel Sheet & Strip (CRGO) must adhere to the Indian Standard IS 3024:2015. This standard specifies the requirements for grain-oriented electrical steel sheets and strips used in the core of electrical transformers and other electromagnetic devices. Compliance with IS 3024:2015 ensures that CRGO materials meet critical quality criteria such as magnetic flux density, core loss, and thickness tolerance, essential for efficient energy transmission and distribution in electrical equipment. Adhering to this standard is crucial for manufacturers to ensure product consistency, reliability, and regulatory compliance, thereby supporting the reliability and performance of electrical infrastructure.

Key highlights

Product Name	Grain oriented electrical steel sheet & strip (CRGO)
Applicable Indian Standard	IS 3024:2015
Applicable Certification Scheme	Product Certification Scheme (ISI Mark Scheme) Scheme 1 - Schedule 2
Compliance Requirement	Mandatory
QCO Link	BIS Certification for Grain oriented electrical steel sheet & strip (CRGO)
Scope as per Standard	1.1 This standard covers the requirements of flat rolled, fully processed (in final annealed condition) grain oriented, electrical steel sheets or strips and intended for the construction of transformer cores operating at moderate to high inductions at commercial power frequencies and other magnetic circuits. 1.2 This standard does not cover intermediate material such as MgO coated steel and strip intended for manufacture of grades as defined in Table 1 and Table 2 or any CRGO products. 1.3 The electrical steel grades described in this standard include conventional and high permeability grain oriented electrical steel tested at 1.7 Tesla, 50 Hz or 60 Hz. 1.4 These sheets and strips shall be coated on both sides with inorganic insulation capable of withstanding stress relief annealing treatment

Test

The following are the major tests grain oriented electrical steel sheet & strip (crgo)

General Requirement and surface conditions Dimensions & Tolerances of Corrugated Sheets
Core loss
Magnetic Polarization
Surface Insulation Resistivity
Stacking Factor
Ductility
Dimensions & Tolerances
Workmanship, Finish and Appearance

BIS Certification for Grain oriented electrical steel sheet & strip (CRGO)

NOTE:

For Detailed Information about the Procedure for BIS ISI Certification, Visit :

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Procedure for Domestic Manufacturer
Procedure for Foreign Manufacturer

Timeline for BIS Certification

The approximate timeline to obtain BIS certification for Grain Oriented Electrical Steel Sheet & Strip (CRGO) to use the ISI mark as per IS 3024:2015 is as follows:

For Indian Manufacturers (Standard Timeframe – 30 days)
For Foreign Manufacturers (Standard Timeframe – 180 days)

Conclusion:

In conclusion, Grain-oriented electrical steel sheet and strip (CRGO) are specialized materials crucial for transformers and large electrical machines due to their enhanced magnetic properties and efficiency in energy transmission. With a grain structure optimized for directional magnetization, CRGO steel minimizes energy losses, enhances magnetic permeability, and reduces core loss, making it indispensable in the energy sector for improving device reliability and efficiency. BIS certification is essential to ensure CRGO sheets meet rigorous quality standards, including magnetic properties, core loss, and dimensional accuracy, ensuring reliable performance in electrical equipment. Compliance supports regulatory alignment, consumer trust, and the adoption of high-quality materials, crucial for advancing safer and more efficient electrical infrastructure according to Indian Standard IS 3024:2015.

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