We have full-set of Cold Drawn&Rolled Mill and 2 sets of Cold Rolling Machine to ensure the roughness of stainless steel tubing surface. And degreasing work all finished by manual, that ensure the brightness enough of stainless steel tubes. Final solution annealing finished with Bright Annealing Furnace. Without of Pickling, So it will friendly with the Environment.
We have 1 Set of Precision Cold Rolled Machines using highly polished rollers in touch with the stainless steel surface and control the velocity of the pilger machine to ensure the smoothness and brightness. Zhongrui keeps selecting the best quality stainless steel round bar, clean and smooth on outside surface and inside surface. Withstand high pressure,no deformation after cold bending, no crack and break after flattening and flaring etc.
Precision instruments and parts
Medical equipment apparatus
Electronic and electric appliance
Auto-electrical and semi-conductor
United States: ASTM A213 / A269 / A632
Europe: DIN 17458 / ISO 1127
Main Testing Terms and Procedure:
· 1. Heat Treatment and Solution Annealing / Bright Annealing
· 2. Cutting to required length and deburring;
· 3. Chemical Composition Analysis Test With 100% PMI and One tube from each heat by Direct Reading
· 4. Visual Test and Endoscope Test for Surface Quality Test
· 5. 100% Hydrostatic Test and 100% Eddy Current Test
· 6. Ultrasonic Test subject to the MPS (Material Purchase Specification)
· 7. Mechanical Tests includes Tension Test, Flattening Test, Flaring Test, Hardness Test
· 8. Impact Test subject to Standard request
· 9. Grain Size Test and Intergranular Corrosion Test
· 10. Ultrasonic measuring of Wall Thickness
Marking & Packing
· Marking according to MPS and Standard
· Stainless Steel Tubes Ends with Caps according to PO
· In Seaworthy Wooden Cases With Plastic Paper protect
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