Quality

Name :

Download :

ISO 14001 : 2004

OHSAS 18001 : 2007

ISO 9001 : 2008

Tata Steel Tubes SBU inherent working policy embodies an unwavering commitment towards the highest quality standards for all its products. This is why our ISO: 9001:2000 certified Steel Tubes plant has developed an exhaustive quality check system to ensure that only the best tubes are delivered to our esteemed customers.

The Testing Procedures are extremely stringent and are of two types –

Non - Destructive Test

At Tata Steel Tubes SBU Non Destructive Test, better known as NDT operation covers all aspects of production without disturbing the process flow. Quality of welding joint produced by HFIW is determined by a probe fixed in the production line. Weld quality test involves the continuous passage of Eddy current through the weld joint. This current is continuously monitored and analyzed over computer screens. Uniform and good quality weld joints will lead to the appearance of a steady sinusoidal curve on the monitor screen

An abrupt change in the sinusoidal curve indicates the presence of a defect in the concerned weld joint and activates the cutting machine to cut off the defective portion of the tube. Online NDT to examine weld quality is one of the most advanced quality control techniques used by Tata Steel Tubes SBU.

 

Destructive Testing

Destructive Testing involves taking out a sample from every lot in the production line to determine the overall quality of product. The original sample gets destroyed during this process.

Tata Steel Tubes SBU carries out 4 different types of destructive tests to determine product quality.

  • 1. Bending Test - The superior bend quality of Steel Tubes from Tata Steel is ensured by testing tube samples in a bending machine where they are bent by 360 degrees to check whether the weld is ruptured or not.
  • 2. Flattening test - A Universal Testing Machine commonly known as UTM is used for carrying out the flattening test. The tube sample is placed on the table of UTM and then force is applied from the top till the tube flattens out completely. Once flattened the weld is then checked for any kind of rupture. Non rupturing weld property of Tata Tubes is another factor behind the unmatched levels of customer trust that is enjoyed by our products.
  • 3. Drifting Test - This is another important test that establishes the superior quality of weld existing in all Steel Tubes from Tata Steel. Tube sample is placed on a cone which in turn is placed on the bed of a Universal Testing Machine. Force applied from the top presses the tube sample against cone top till it tears out. The tear produced in the sample is then examined to detect the exact regions where tearing of material occurs. Weld joints in the steel tubes are created at the molecular level which ensures the highest levels of weld strength. This ensures material rupture during Drifting Test never to occur along the weld line.
  • 4. Weld Macro Structure Examination - is conducted to ensure that only those tubes having the best quality weld which matches up with acceptable standard qualities of weld patterns are declared fit for use. For Macro Structure Examination weld joints from a sample are analyzed under microscope to determine the exact nature of weld patterns which are then compared with permissible weld patterns for the generation of weld quality status report.
 

Time Effect

An uncompromising commitment towards the adherence of quality standards - This is what makes Tata Steel Tubes SBU command unmatched levels of customer satisfaction and trust in the market. Infused with a comprehensive quality policy and diligent R&D for every stage, Tata Steel Tubes SBU has been quick overcome the effects of various factors that are detrimental towards the working life of its steel tubes.

Our exhaustive research has led to the identification of three major Aspects that determine the overall effects of time on the working life of Steel tubes.

1. Manufacturing Aspect

When it comes to the relation between manufacturing process of Steel tubes and their working, there are 3 important parameters playing a critical role:

  • a. Raw material quality - Quality of input will always dominate the quality of output. Superior quality raw materials increase the life span of steel tubes in a big way. Tata Steel Tubes SBU uses only high quality in-house HR coil strips from the technologically advanced mills of Tata Steel that carry with them the quality assurance of a Tata Steel Brand.
  • b. Process Control - Better process control implies longer working life of steel tubes. Tata Steel Tubes SBU makes use of fully automated machines that guarantee unmatched levels of process control. We have developed robust working partnerships with globally renowned organizations like Otto Mills, Italy, Kusakabe, Japan and Mair Research, Italy for machine procurement. Our machines are equipped with international standards of process control for the manufacture of steel tubes that have a tremendous impact on steel tube's working life.
  • c. Galvanization: Consistent and uniform zinc coating is essential for long working life of steel tubes. Tata Pipes provide a minimum of 360 GSM zinc coating both on outside and inside of tubes, offering greater resistance to corrosion, preventing water contamination and resulting in increased longevity. An additional Thin Organic Coating is being provided to the Tubes used for Plumbing applications which increases their working life by three times.

2. The Application Aspect -

During installation of pipes, following the best trade practices as per application, results in efficient usage, hassle free maintenance and therefore enhanced longevity. Steel Tubes from Tata Steel are extremely robust, have high weight to length ratio, have superior weld quality ensuring minimal leakage and improved straightness.

3. The Utilization Aspect -

The nature of fluid defines the longevity of the pipe in a great way. Acidity and the salinity are two major parameters which define the life span.

Highly acidic or basic fluids will initiate chemical reactions with the zinc coating that has been applied during galvanization and cause a depletion of the protective layer. Dissolved salts in fluids may also react with zinc. To improve the working life of Steel tubes the choice of tube quality must match the nature of fluids involved in the application.