BIS Certification for Plain Hard-Drawn Steel Wire for Pre-stressed Concrete– IS 1785 (Part 1): 1983

Plain hard-drawn steel wire is widely used in prestressed concrete structures. The wires are produced by using the method of cold drawing. This increases the strength of the wires and is mainly used in bridges, poles and similar applications. The wires undergo special treatments to eliminate the stresses that arise during production.

Obtaining the BIS certification ensures that the wire meets the technical requirements specified in IS 1785 (Part 1):1983. The process of obtaining the BIS Certification involves many different kinds of tests, including tensile strength test, elongation test, relaxation test, diameter testing test, and others. Manufacturers must obtain the BIS certification to sell the steel wires to the Indian customers.

What is IS 1785 (Part 1): 1983?

This is the Indian Standard for Plain Hard-Drawn Steel Wire for Prestressed Concrete - Cold Drawn Stress-Relieved Wire. It mentions the quality and mechanical properties to ensure safe use of steel wires in prestressed concrete applications. As per the BIS (Bureau of Indian Standards),

wires are:

Tested for tensile strength
Checked for elongation
Inspected for dimensional accuracy
Monitored under quality assurance

Stress Relieved Steel Wire BIS License

Eligibility Guide BIS authorisation under IS 1785 (Part 1): 1983 is required for businesses involved in manufacturing, importing, or supplying cold-drawn stress-relieved wire in India.

Applicable to:

Manufacturers (India) - Must get BIS approval if the prestressing steel wires are covered under QCO.
Foreign Manufacturers - Need certification to export the product to India.
Importers/Brand Owners - Must ensure that the products are BIS-certified before sale.
Sellers/Distributors - Should only sell certified steel wire.

Testing and Inspection Requirements

To ensure the reliability of plain hard-drawn steel wire used in prestressed concrete applications, the Bureau of Indian Standards outlines the minimum requirements under IS 1785 (Part 1): 1983. This certification ensures that manufacturers meet the strength and durability standards of the steel wires. The BIS testing parameters and quality checks for the Cold Drawn Stress Relieved Wire are listed below:

Test Group	What is Tested	Purpose
Chemical Composition Tests	Verification of steel chemical composition as per Clause 3 of IS 1785 (Part 1):1983	Ensures the steel wire conforms to specified material quality requirements
Nominal Size & Tolerance Tests	Measurement of wire diameter, ovality, and dimensional tolerances	Ensures dimensional accuracy and uniformity of prestressed concrete wires
Nominal Mass Tests	Measurement of wire mass per unit length	Ensures wire meets specified weight and size standards
Tensile Strength Tests	Tensile load and breaking strength determination using UTM	Ensures the wire can withstand high tensile stress in prestressed concrete applications
Proof Stress Tests	Determination of proof stress under controlled loading	Ensures the wire maintains required elastic properties under stress
Ductility Tests	Bend and flexibility testing using mandrels	Ensures the wire has adequate flexibility without cracking
Elongation Tests	Measurement of elongation after fracture	Ensures sufficient deformation capacity before failure
Relaxation Tests	Stress relaxation performance over a specified period	Ensures the wire retains prestressing force over long-term usage

How to Get BIS License for Cold Drawn Steel Wire?

The BIS Authorisation process ensures that the prestressed concrete stress-relieved wire meets the required standards for proper and efficient operation. This process is set by the Bureau of Indian Standards (BIS) and includes the following steps:

Online Registration: Manufacturers register on the BIS Manak portal by submitting company, factory, and product details. Foreign manufacturers must appoint an Authorized Indian Representative (AIR).
Testing at BIS-Approved Laboratory: Product samples are tested in BIS-approved laboratories for required safety and performance parameters, including electric strength, insulation resistance, and mechanical integrity.
Application Submission: The application is submitted along with test reports, technical documents, and factory details. Foreign manufacturers must also submit AIR-related documents.
Factory Inspection: Officials from the Bureau of Indian Standards (BIS) conduct an inspection of the manufacturing units to verify the production process, safety measures, and quality control system.
Grant of BIS License: After successful verification of all requirements, BIS grants the certification license under Scheme-I.
Use of ISI Mark: Once the license is granted, the manufacturer can use the ISI mark on the product with a CM/L number, confirming that the product meets BIS standards.

complete Documents list for IS 1785(Part 1): 1983 approval

Document Category	Documents Required
Basic Details	GST Certificate, Email ID & Contact Number, Factory & Office Address, Rent Agreement / Lease Deed (if applicable),Partnership Deed (if applicable for partnership firms)
Manufacturing Details	List of Machinery, Process Flow Chart, Factory Layout Plan
Raw Material Details	List of Raw Materials, Supplier Details, Raw Material Invoices, Raw Material Test Certificates
Testing & Quality Control	List of Testing Equipment, Calibration Certificates, QC/Lab In-charge Appointment Letter & Qualification
Production Details	Annual Installed Capacity, Last Year Production Value
Product & Packaging Details	Quantity per Package, Nature of Packing, Product Printing / Marking Details
Management Details	Top Management Details, BIS Communication Contact Person
Brand & Certification Documents	Trademark / Brand Certificate, Consent Letter from BIS Recognized Laboratory
Additional Documents	Weekly Off Details, Hygiene Document (if applicable), Relaxation Letter (if applicable), Any Other Relevant Document
Foreign Manufacturer Requirement	Appointment of Authorized Indian Representative (AIR) for BIS coordination and compliance in India

Marking Requirements & License Validity

Marking Requirements

After the BIS approval, the ISI Mark for prestressed wire must be clearly and permanently marked on its packaging or on the product. Along with the ISI Mark, essential details such as the manufacturer’s identification and licence number (CM/L) are required. This ensures the product complies with all safety and quality standards. More details are mentioned below: :

Requirement	Details
ISI Mark	Indicates that the product is BIS certified and conforms to standards
Standard Number	IS 1785(Part 1): 1983
CML Number	Certification Marks License (CML) number issued by BIS
Manufacturer Details	Name of manufacturer or registered trademark
Batch / Date	Batch number, heat number, or manufacturing date for traceability

Note:Marking is typically applied using durable stamping, tagging, or permanent printing to ensure clear identification during handling, storage, and transportation, as per BIS marking requirements.

Validity Details for stress relieved steel BIS License

particulars	Details
Initial Validity	Typically 1 to 2 years, depending on BIS approval conditions
Renewal	Must be renewed before expiry by submitting the application along with the prescribed fee and updated documents
Surveillane	Includes periodic factory inspections and market sample testing conducted by BIS
Compliance	Continuous following to standard and applicable Quality Control Orders (QCOs) is mandatory
Risk	Non-compliance or failed sample testing may lead to suspension or cancellation of the BIS license

Fee for Cold drawn stress relieved steel BIS License

The cost of BIS Approval for a coir felt sheet includes charges for application, inspection, license, testing, and marking. These fees are paid to BIS as per Scheme I guidelines.

Charge Type	Indian Manufacturers	Foreign Manufacturers
Application Fee	INR 1,000	USD 15
Audit Charges	INR 7,000	USD 3,200 – 5,900
License Fee	INR 1,000	USD 15
Marking Fee	As applicable	As applicable
Testing Charges	As applicable	As applicable
EVTL India Consultancy Fee	As per actual	As per actual

Note:

Application fee for foreign manufacturers is payable via SWIFT (SAARC countries may pay in INR with applicable GST).
Audit charges for foreign manufacturers vary based on country/location.
The marking fee is determined based on the product category and production volume (MSME benefits may apply).
Testing charges are to be paid directly to BIS-recognised laboratories.
Consultancy fees can vary depending on product type and factory location.

Conclusion

Cold drawn stress-relieved steel wire plays a significant role in improving the load-bearing capacity of prestressed concrete structures. IS 1785 (Part 1):1983 is one such certificate that suggests that the material has been thoroughly tested and meets certain levels of performance and reliability. Use of this wire can minimize the possibility of structural weaknesses. This will also assist in better performance of the projects subjected to changing environmental conditions.

EVTL India provides technical help to businesses that wish to obtain BIS certificates for plain hard-drawn steel wires. They provide technical support in matters of documentation, product testing coordination and other such aspects. With structured technical support, businesses can manage certification requirements more efficiently and avoid delays in the process.