Central Steel
Central Steel
Central Steel
A. Incoming Raw Material
| Sr. No. | Process Description | Ref. Documents Standards | Characteristic to be checked | Samples quorum of size/inspection | Instrument equipment used for testing | Acceptance criteria |
| 1 | S. S. Coils/ Seamless Pipe (Mother Hallow) | Purchase Order/ Specification | • Dimension • T.C. Verification (Lab test Report) (if required) • Packing Condition • Weight • Defects if any | Sample / Heat | Vernier, Micrometer, Chemical, Analysis, Tensile Testing Machine (Brinell Rockwell) Hardness Testing Machine | Confirm to Specification 100% |
B. Stage Wise Inspection
| Sr. No. | Process Description | Ref. Documents Standards | Characteristic to be checked | Samples quorum of size/inspection | Instrument equipment used for testing | Acceptance criteria |
| 2 | I Welded Tube forming & Welding II Seamless Cold Drawing | As per Work order / Specification | Dimensions check Diameter (Ovality) x Length x Thickness • Weight • Defects if any | 3 Samples from each Coil 1 Sample from each lot | Universal testing machine UIN 40 - T Make “UTS” Microscope, Vernier, Micrometer & Measuring Tape | Dimensions acceptance as per order Confirm to standard samples as per details |
| 3 | Annealing | Temperature as per ASTM Standard | • Temperature • Hardness • Cooling • Water Quenching | 1 Sample per lot / 1 Sample per heat | Digital Graphic, Temperature Recorder, Digital Temperature Indicator & Temperature Controller, Metallurgical Microscope, Brine Rockwell Hardness Tester . | |
| 4 | Straightening | Straightening as per specification | Check straightening of Pipes & Tubes | First 2 pipes of each size lot | Roller Straightening Machine, Micrometer, Visual Observation | Straightening as per specification standard sample |
| 5 | End Facing Squaring & Beveling | Burr Free Squaring / Beveling with Proper V-Shape | 100% Visual inspection | Abrasive Polishing as per standard sample | Confirm to specification / requirement | Straightening as per specification |
| 6 | Hydrostatic Testing | As per ASTM standard | Leakages | 100% | Hydraulic Pressure Tester | No Leakage |
| 7 | Picking | As per required ASTM standard | • Scale removing inside • outside surface area | 100% | Visual Observation requirement | Confirm to requirement |
| 8 | Final Inspection Physical / Chemical Testing | As per applicable standard | Visual Dimension, Physical & Chemical | 100% (or) as per ASTM standard | Micrometer, Vernier, Universal Testing Machine, Molly Detector & Caron sampling at random spectra / wet method | Confirm to requirement |
| 9 | Marking (as per) customer requirement / standard marking | As per requirement | • Spell check • Details verification | 100% Confirm on first two sample & continue | Inkjet machine / Electro Etching co-relation of heat no size Grade etc. with Test certificate | Confirm to requirement |
| 10 | Packing & Delivery | As per customer requirement | Packing quality Tightness of packing | 100% confirm to requirement and release for | Box Crate, Polythene, Hessian Cloth | Packing confirm to customer requirement |
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