IS 10748:2004 Hot-Rolled Steel Strip for Welded Tubes and Pipes - Specification

BIS - IS 10748: 2004 is a specification for hot-rolled steel strips to be used in welded tubes and pipes. The purpose of this specification is to maintain the quality and performance of these steel strips. 

It gives composition requirements for chemical composition and mechanical properties. Surface quality also plays an important role. These rules will help the manufacturers to give strong and durable products for plenty of uses. Weldability is one of the dominant characteristics of these steel strips. This gives a strong joint when assembling tubes and pipes. If followed by IS 10748: 2004, then the manufacturers' product would always be in line with safety and performance standards. This mainly applies to construction and engineering.

These steel strips have dependability on the welded structure. Manufacturers ensure that their items are safe and reliable through this standard. As a whole, IS 10748: 2004 helps in producing effective and strong welded products for many applications.

What are Hot-Rolled Steel Strips?

Hot-rolled steel strips are made by rolling hot steel more than 1700°F. This increases the formability and workability of the steel. The steel is apt for several applications like welded tubes and pipes.

The strips have a uniform thickness and consistent mechanical properties. That is to say that this kind of steel or type which is under discussion can provide reliable performance in construction and related industries, automotive industries, or any industrial sectors. Hot-rolled steel strips are strong and tough which means they make one of the best options for application purposes.

This standard states the requirements of weldable hot-rolled steel strips which are manufactured in coils. These strips are produced for welding into steel tubes and pipes. The specification ensures this steel has the necessary mechanical properties and weldability for safe and reliable production.

Key Features of BIS - IS 10748: 2004 

• Weldability: Ensure that the steel strips have good weldability for flawless welds.
• Chemical Composition: Contains limits that are permissible for elements such as carbon, manganese, phosphorus, etc.
• Mechanical Properties: Contains requirements for tensile strength, yield strength, elongation, etc.
• Surface Quality: Containing the requirements regarding surface finish free from any scales and rust, etc.
• Testing Methods: Specifies methods for testing mechanical properties as well as weldability, etc.
• Marking: Provides guidelines for proper marking of the steel strips and identification.
• Compliance: This ensures a minimum standard regarding the safety and performance of the products needed for industrial use.
• Durability: It encourages the development of rugged and consistent welded tubes and pipes.

• Quality Assurance: High-quality standard of hot-rolled steel strips.
• Safety Requirements Compliance: Safety standards for the steel strips are affirmed.
• Consistency: Provides uniform thickness and properties.   
• Industry Standards: Meets construction and automotive industry requirements  
• Consumer Confidence: Increases customer confidence in product quality  
• Regulatory Compliance: Assists in achieving safety standards 
• Performance Assurance: Assures strength and ductility in strips
• Prevents Failures: Avoids failures in welded structures
• Supports the Manufacturers: Assures high-grade materials for use.
• Economic Impact: Reduces projects' consumption, time, and cost.

For the purpose of this standard, the following definitions in addition to those given in IS 1956(Part 4) shall apply.

• Micro-Alloying Elements: Includes niobium, vanadium and titanium. They are added to improve strength, formability, weldability, and toughness compared with non-alloyed steel at similar strength levels.
• Coil: A rolled flat strip product wound up into layers that form a coil with nearly flat sides. It shall contain at least 50 laps.
• Hot-Rolled Steel Strip in Coils: This material is produced by rolling heated steel through a mill for thickness. The surface usually has oxide or scale from the hot roll process.

• Construction Industry: Scaffolding, supporter structures, and steel frameworks for building purposes.
• Automotive Industry: Used to create exhaust systems, chassis, and structural parts within automobile vehicles.
• Mechanical Engineering: Used in manufacturing machinery parts with welded steel sections.
• Piping Systems: Useful for liquid and gas-carrying pipes as well.
• Oil and Gas Industry: Developed for pipeline projects, oil storage tanks, and other steel structures.
• Furniture Industry: Used in furniture and fixtures with robust welds made up of steel.
• General Fabrication: Required in various fabrication techniques using resistant welded steel strips.
• Farm Implement: Make and manufacture farm machinery and equipment.
• Infrastructure: Offers the needed materials to give railings, guardrails, and other infrastructures.

Dimensions

The nominal dimensions and thickness of hot-rolled steel strips shall comply with the following specifications of IS 1730. If agreed to by both the purchaser and manufacturer, sizes other than those specified above can be supplied.

Tolerances

Thickness and width shall be within the tolerance limits of IS 1852. Edges to be cambered shall have the tolerance as required in IS 1079. The purchaser may accept a higher class of tolerance at the discretion of the supplier.

Condition of Coils

• The supplier may have mill edges or slit edges at their option. The defects shall be within 5 mm from the edges if mill edges are specified.
• Material shall be supplied in as-rolled condition. If pickled, oiled, cleaned, annealed, or normalized, this must be specified.
• The end of the coil may be cropped if agreed upon. Coils must not have folded ends. When the fishtail is not cropped, it should not exceed 0.5 m.
• The coils should be well packed in order not to be damaged during shipment.
• The telescopicity of the coils must not be more than 100 mm.

IS 10748: 2004 will be upgraded based on new technology and changes in industrial needs. There may be a thrust on weldability strength improvement along with eco-friendly material that could sustain the needs of sustainability. Innovations in manufacturing will enhance the quality of steel strips produced. Multiple industries will also get support from this standard, which is consistent with the safety and reliability of welded items. This standard will remain current by periodic updation. It will make compliant producers meet global standards. Overall, IS 10748: 2004 will have the most significant role in the production of steel.

Corpseed can help with IS 10748: 2004 compliance. We offer guidance on standards and assist with documentation. Our support helps manufacturers ensure their hot-rolled steel strips meet safety, quality, and performance requirements.