Zhejiang Steady Stainless Steel Pipe & Tube Manufacturing Co., Ltd.

Name:Production
Description:01) 25 Tonnes-Electronic Arc Furnace plus AOD Refinery 02) Molten Steel into Mould Cooling Into Ingots 03) Ingots after Hot Rolling Process Into Round Bars 04) To peel the Bars to Remove Oxalates to make the surface smooth 05) Calculation and then Cutting of Round Bars 06) To Mark the Centering Points of Bars 07) To Heat the Bars under Temperature of 1150 degrees 08) To Drill the Heated Bars 09) Rapid Cooling Under Water Under Room Temperature 10) Annealing to Improve Microstructure, to Refine Grain sizes, to Modify Physical Prosperities, to Improve Machinability and to Make C Combined with Nickel to Avoid IGC Corrosion. 11) Pickling of Hollow Bars to Remove Surface Oxalate Residuals 12) Inspection on Hollow Bars 13) Lubrication of Hollow Bars to Make Surface Smooth 14) Cold Drawing plus Cold Pilgering 15) Pickling to Remove Oil and to Remove Surface Oxalate Residuals 16) Annealing & Solution of Pipes and Tubes 17) Straightening of Pipesand Tubes 18) Cutting 19) Pickling & Passivation 20) Inspection at Final Stage: a) Hydro Testing b) ET Testing c) UT Testing d) Mechanical, Technical & Hardness Test 21) Stenciling 22) Packing 23) Delivery