Sr.No. | Process Operation | Quality Characteristics | Method of control |
1 | Raw Material (Strip) | 1> Dimensions 2> Chemical analysis 3> Control of Slit which within specified limits 4> Surface Actual measurement as per Std | Analysis of all elements as per Std Testing as per various Std. Measurement of width, thickness & recording visual inspection. |
2 | Tube Mill (GTAW Type) | 1> Weld Test, Flare Flanges, Flattering Reverse bend & Reverse Flattening 2> Inspection of weld, seam 3> Dimensions 4> Surface | Testing as per ASTM specification & recording the result. One test for every 30 to 35 Mtrs. Visual inspection weld zone. O.D. , Thickness & Length. Check roller surface profile& finish. |
3 | Solutions Annealing (At Min. 1040 C) With continuous water quenching. | 1> Temperature 2> Hardness 3> Micrometer | Automatic Relay Temp / Controller Adjusted to present level. Measurement of hardness as per Std. one Test / Lot / Heat |
4 | Straightening Straightness OD | Surface Finish | Adjust roller setting measure visual |
5 | Cutting | Square cut Length | Right angle to length, visual |
6 | Deburring | Burs removal On OD and ID Edges | Visual |
7 | Chemical Treatment a) Pickling b) Passivation) Bath Concentration c) Bath Concentration | Concentration Temperature | One Test / Bath Day One Test / Bath Day Temperature |
8 | Hydrostatic Pressure | Test Pressure | 100 % Inspection at test pressure specified as per ASTM Std. |