Quality Assurance

In Hualong, quality is not only the detection of the final process of the production process but throughout the process. We implement a complete set of quality control and assurance systems for precise production processes. Because our stainless steel seamless pipe products are widely used in large petrochemical and energy projects, the negligence of any detail can have unpredictable consequences, ensuring that each product is highly reliable. We implement precise production processes, control the entire process of quality, and strictly and effectively control from raw material procurement to production process to inspection and testing to ensure zero defect and high quality. Each batch of stainless steel pipes is sampled, sectioned, tested, tested, and retained as a quality assurance for the final product. Whether it is a semi-finished product or a finished product, each test is carried out at the testing center, ensuring that the entire process is in a good environment. Through quality management training, system standardization, manufacturing standardization, and strict evaluation of suppliers, we ensure the superior quality of our products in every aspect.

Tube inspection control points: 1 Chemical composition retest 2 Surface quality 3 Dimensions 4 Quality certification documents

Tube heating control point: 1 heating temperature 2 holding time

Waste pipe inspection control points: 1 Dimensional tolerance (outer diameter\wall thickness) 2 Surface quality 3 Dimensions 4 Quality Document 5 Chemical composition retest

Cold working control points: 1 Dimensional tolerance (outer diameter\wall thickness\length) 2 Surface quality 3 Cold drawing/rolling process execution compliance

Heat treatment control points: 1 Insulation section temperature control 2 Automatic temperature recording situation 3 Insulation time or process specified speed compliance

Physical and chemical inspection control points: 1 Finished product analysis 2 Tensile test 3 Flattening test 4 Flaring test / (optional bending test) 5 Hardness test 6 Impact test 7 Intergranular corrosion test

Measuring 8 100 times metallographic examination (grain size)

Non-destructive testing control points : 1 eddy current testing ET 2 ultrasonic testing UT

Finished product inspection control points: 1 Hydraulic test 2 Surface quality 3 Dimensions (outer diameter\wall thickness\length) 4 Product identification.