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Quality and Testing
An ISO 9001:2015 certified quality system, an in-house laboratory that tests every lot, and lot-and-coil traceability from rod heat number to dispatch.
Certified Quality Management System
Indisteel's quality management system is certified to ISO 9001:2015 for the manufacture of annealed and drawn steel wire. Process controls, inspection plans, calibration and corrective action are documented and audited.
Eight Things a Wire Supplier Must Get Right
These are the checks that decide whether wire heads cleanly, holds size and heat-treats predictably — and how Indisteel controls each one.
Incoming Rod Verification
Every heat of rod is checked on our spectrometer against the mill certificate before it enters production — chemistry, hardness and microstructure are recorded against a new lot number.
Spheroidization and Decarburization Control
Annealed coils are examined under the microscope for spheroidization percentage and decarburization depth. Results are recorded coil-wise; a coil that misses the grade window is held, not shipped.
Hardness Window per Grade
Grade-wise annealed and as-drawn hardness ranges are defined in our masters and agreed with the customer. Every coil is tested on a Rockwell tester and judged against that window automatically.
Dimensional Control
Diameter and ovality checked with calibrated micrometers at start-up and during the run on every drawing machine, and again at final inspection.
Surface and Coating
Phosphate coating weight measured in the laboratory; wire surface inspected for scratches, scale and lubricant carry-over before packing.
Cold Formability
Dump (upset) tests and wrap tests confirm that the wire will head and form without cracking before it leaves the plant.
Calibrated Instruments
Hardness tester, UTM, micrometers and gauges are calibrated to a schedule under the ISO 9001 system, with records available for customer audit.
Traceability and Records
Lot, coil and furnace charge numbers on every tag; month-wise inspection registers; the full history of any coil retrievable from its tag number.
Testing Facility
Chemistry, hardness, tensile, microstructure and coating are all tested in-house, so a lot never waits on an outside laboratory — and the certificate reflects our own measurements.
Optical Emission Spectrometer
Full chemistry of incoming rod — C, Mn, Si, S, P, B, Cr, Mo and residuals — checked against the mill certificate
Rockwell Hardness Tester (HRB / HRC)
Hardness of rod, annealed coils and finished wire; coil-wise recording after annealing
Universal Testing Machine (UTM)
Tensile strength, yield and elongation; reduction of area
Metallurgical Microscope
Spheroidization percentage, decarburization depth and grain size
Phosphate Coating Weight Test
Coating weight by strip-and-weigh method on phosphated wire
Dump Test and Wrap Test
Cold-formability check for cold heading; ductility of drawn wire
Micrometers, Gauges and Measuring Instruments
Size, ovality and surface checks at every drawing machine and at final inspection
What Is Checked, and When
Inspection is tied to the process route. Each stage has its own record, and the results follow the coil on a printed tag.
| Stage | Checks | Record |
|---|---|---|
| Incoming rod | Visual, size, chemistry (spectrometer vs mill TC), hardness, tensile, microstructure, dump test | Incoming inspection report, lot number assigned |
| After annealing | Coil-wise hardness, tensile, spheroidization %, decarburization, dump test, visual | Annealing inspection report with furnace charge number; annealed coil tag |
| Phosphating | Coating weight, bath parameters | Process log |
| Wire drawing | Size and ovality at start-up and during run, surface, coil weight | In-process inspection report |
| Final inspection | Size, hardness, tensile, surface, wrap test, packing | Final inspection report; finished product tag; material test certificate |
Every Coil Has a Number
Each rod heat received becomes a lot; each coil in the lot carries its own coil number; each annealing charge has a charge number. These follow the material through pickling, annealing, phosphating and drawing on printed tags with QR codes, and are recorded in our production traceability system. When you quote a lot number from our test certificate, we can pull the complete history of that coil.
- Material test certificate (MTC) with every lot supplied
- Heat number, lot number and charge number on every tag
- Month-wise inspection registers available for customer audits
Need a Sample Test Certificate or an Audit Visit?
We welcome customer audits at the plant. Ask for a sample MTC for the grade you buy.