Quality Laboratory Test

Quality Policy

Our mission is to supply Best Quality Steel to full satisfaction of our valued customers. We intend to service our customers with the right material in Quality & Quantity as per timeliness set by customer. We shall focus on value addition in process, at every step, through higher involvement of all concerned including our team, customers & suppliers. We shall also strive for continual improvement in systems development, human resource development, innovation and communication

  • An automated laboratory for analyzing in-process samples from the melt shop and caster within a few minutes.
  • 2 Spectrometers for Steel composition analysis
  • 1 Spectrometer for zinc analysis
  • LECO Carbon/Sulphur analyser
  • LECO Oxygen/Nitrogen analyserLECO Hydrogen analyser
  • 3 nos universal Tensile Testing Machines of upto 100 tonnes for properties like yield strength, ultimate tensile strength, percent elongation
  • Impact testing machine : Impact strength can be checked at minus 40 deg C to room temperature
  • Erichsen Cupping Test Machine check the limiting dome height and other cupping characteristics
  • Rockwell hardness testing machine
  • Brinel hardness testing machine
  • Study of microstructures are done on an image analysis system in a metallurgical microscope with magnification upto 1500X

MECHANICAL/METALLOGRAPHICUniversal Testing Machine – 20/40/100 T Bending Cum Folding Machine Rockwell Cum Superficial Hardness Tester Vickers Hardness Tester Brinel Hardness Tester Portable Ultrasonic Flaw Detector Portable Magnetic Flaw Detector Erichsen Cupping Machine- Manual Erichsen Cupping Machine – Hydraulic Portable Hardness Tester (EQUOTIP) Impact Testing Machine Ultrasonic Thickness Gauge (0.1 – 200.0mm) Module – R Tester Metallurgical Microscope (X 1500) Zoom Stereo Microscope (X 45) CHEMICAL / PROCESS CONTROLEmission spectrometer for steel (19 Channel)Emission spectrometer for steel (24 Channel) Emission spectrometer for zinc (8channel) Atomic absorption spectrophotometer Carbon- Sulphur analyzer Oxygen- Nitrogen analyzer Hydrogen analyser Infrared optical pyrometer (400-1600 deg C) Surface roughness tester

Raw Material
  • Scrap – Inspected at source by third party
  • Check Analysis /Supplier Test Certificate
  • DRI – Internally tested (Sample checked)
  • Ferro Alloys Supplier Test Certificate. Samples checked [all lots random basis]
  • Limestone / Lime Sample checked, analysed regularly
  • Other additions – sample checked
SMS
  • EAF /Ladle Sample
  • Batch Chemistry [Checked for all heats]
  • Temperature and oxygen level
  • Ladle Sample 4-6 samples at intervals
  • Chemistry
Slab Quality
  • Dimensional check
  • Surface Quality – visual
  • Reconditioning by manual scarfing
Random slabs checked by QA based on steel grade & quality
 HRM
  • Reheating Temperature
  • Rolling Temperature
  • Coiling Temperature
  • Coil- Gauge, Profile , Width
  • Visual inspection for HR coil
Laboratory Testing
  • Physical & mechanical testing
  • Frequency of test – As per requirement of relevant
  • specifications and agreed technical delivery conditions (TDC)
  • Normally the tests are Yield Strength, Tensile Strength,
  • percentage elongation,
  • Bend test, Charpy impact test, Sheet metal ductility
  • test, Hardness test, Microstructure
  • Third party inspection, if required
HR Sheets/ Coils/Plates Visual Inspection Dimension Mechanical Test

Pickling
  • Acid Temperature
  • Acid Concentration
  • Iron Concentration in acid bath.
Cold Rolling
  • Roll Coolant parameters
  • Coil Surface
  • Coil Dimension
Galvanizing
  • Furnace temperature
  • Zinc bath chemistry
  • Chromic acid parameters
  • Visual inspection of coil/sheet
  • Dimension of Coil/Sheet
Mechanical properties of coil/sheet  

Stage Parameter Measured Acceptance Critetria
HR Pickling Visual inspection for Visual Defects Reasonably free from all defects
Cold Rolling Physical inspection Dimensions Visual inspection for Visual Defects Reasonably free from all defects
CR Trimming Physical inspection Width
Raw Material Hi Grade Zinc, Chemical Characteristics Zn = 99.95 % Min.
Zinc Bath Chemistry Chemical Characteristics Different criteria for Normal spangle & Mini Spangle
Continuous Galvanizing Physical inspection 1]Zn coating, 2]Zn Adherence 3]Mech Prop. 4] hardness 5] Visual inspection for Visual Defects 6] Dimensional Characteristics 7] Anti Fluting Test As per specification / TDC As per specification / TDC As per specification / TDC As per specification / TDC As per specification / TDC As per specification / TDC As per TDC