Quality Control
Product Quality Control
In terms of quality control, Jinao always adheres to a rigorous attitude and high standards, and is committed to providing customers with the best quality products. In order to ensure that each seamless steel pipe meets the product quality requirements, the company strictly controls the product production process in accordance with the requirements of the IATF16949 system, and is equipped with advanced testing equipment and technical teams to conduct comprehensive and detailed testing and testing of various quality technical indicators of the products. From the selection of raw materials to the delivery of finished products, every link is strictly controlled to ensure that the performance, size, material and other aspects of the product reach the industry-leading level.
Raw material testing
Blank inspection
First, middle and last piece inspection
Random inspection
Mechanical properties testing
Nondestructive Testing
Finished product testing
Testing Equipment
Ultrasonic flaw detection equipment
Eddy current flaw detection equipment
Tensile/flattening testing machine
Direct reading spectrometer
Metallographic microscope
Hardness Tester
Profilometer
Altimeter
Ceramic Fiber Muffle Furnace
Inspection Items
| Inspection items | Inspection content |
| Raw material inspection | Chemical composition, inclusion detection, macrostructure, surface quality, geometric dimensions (sampling by furnace number batch) |
| Perforation self-inspection | Cutting quality, tube blank heating, internal and external surfaces, geometric dimensions (inspected once every 10 pieces) |
| Wool tube inspection | Internal and external surfaces, geometric dimensions (100%) |
| Pickling inspection | Incoming material quality, process quality, solution testing |
| First piece inspection | Inner and outer surfaces, geometric dimensions |
| Cold drawing self-inspection | Incoming material quality, inner and outer surfaces, geometric dimensions (inspected every 5 pieces) |
| Tour inspection | Inner and outer surfaces, geometric dimensions, process quality |
| Finish rolling self-inspection | Incoming material quality, inner and outer surfaces, geometric dimensions (inspected every 3 pieces, cut every 6 pieces) |
| Heat treatment inspection | Tensile strength, yield strength, elongation, hardness, metallographic structure |
| Finished product inspection | Mechanical properties, flaw detection (ultrasonic, eddy current), internal and external surfaces (100%), geometric dimensions (100%), internal and external surfaces (100%), geometric dimensions (100%) |
