Jindal Hissar, a major player in India’s steel industry, produces a range of steel pipes, primarily focusing on seamless and welded pipes. The manufacturing process for these steel pipes generally follows industry-standard steps, including both material preparation and production stages, which can be summarized as follows:

1. Raw Material Selection

The process starts with selecting high-quality raw materials, typically billets for seamless pipes and hot-rolled coils or strips for welded pipes. The type of steel used is often low carbon or alloy steel, depending on the application.

2. Heating and Piercing (For Seamless Pipes)

• Billet Heating: For seamless pipes, steel billets are heated in a furnace until they reach the right temperature for deformation (above 1200°C).
• Piercing: The hot billet is then fed into a piercing mill where it’s pierced at the center by a rotating mandrel or piercer, creating a hollow tube. This is the first stage of shaping the pipe.

3. Forming the Pipe (For Welded Pipes)

• Strip Preparation: For welded pipes, steel strips are shaped into tubular forms by passing them through a series of rollers that gradually curve the strip into a cylindrical shape.
• Welding: Once the strip is formed into a tube, the edges are welded together using either an electric resistance welding (ERW) or submerged arc welding (SAW) process, depending on the pipe type and size.
  • ERW: Primarily used for smaller diameter pipes, where the edges of the steel strip are fused through heat generated by electrical resistance.
  • SAW: More common for larger diameter pipes, where an arc is submerged under a layer of flux, protecting the weld from contamination.

4. Elongation (For Seamless Pipes)

• After piercing, the hollow tube is elongated by passing it through rolling mills to achieve the required length and diameter. This process is known as the elongation stage and involves continuous rotation and rolling, reducing the wall thickness and expanding the diameter of the tube.

5. Heat Treatment

Both seamless and welded pipes may undergo heat treatment processes like normalizing, quenching, and tempering to achieve the desired mechanical properties, such as strength, toughness, and hardness. The heat treatment also improves the pipe’s resistance to corrosion and stress.

6. Sizing and Shaping

• The pipes are then passed through sizing mills to ensure the correct diameter and wall thickness. In this process, the outer diameter is fine-tuned to meet precise specifications.
• For welded pipes, non-destructive testing is carried out to ensure the weld quality is flawless.

7. Cutting

The long steel pipes are cut into specific lengths using automated cutting machines. This ensures uniform pipe sizes based on customer requirements.

8. Surface Treatment

• The pipes often go through surface treatments such as pickling, galvanizing, or coating to prevent rust and corrosion.
• Galvanization (applying a protective zinc coating) is common for pipes used in corrosive environments like plumbing, oil & gas, and water supply systems.

9. Testing and Inspection

Stringent quality control tests are conducted to ensure that the pipes meet industry standards. These tests include:

• Ultrasonic Testing: To check for internal defects.
• Hydrostatic Testing: To ensure the pipe can withstand high pressures.
• X-ray Inspection: For welded pipes, to check the weld quality.
• Dimensional Checks: To verify the diameter, wall thickness, and overall size of the pipes.

10. Finishing and Packaging

The pipes are marked with identification tags, painted or coated (if required), and packed securely for shipment. They are bundled or palletized depending on their size and customer needs.

11. Logistics and Shipping

After production and quality control checks, the pipes are loaded and shipped to various sectors, including oil & gas, construction, infrastructure, and other industrial applications.

Jindal Hissar maintains a strict quality control system throughout this process to ensure their pipes meet global standards, such as ASTM, DIN, API, and IS, among others.