How to ensure the processing quality of degreased stainless steel pipes

To ensure the processing quality of degreased stainless steel pipes, it is necessary to start from multiple aspects such as raw material selection, processing process control, degreasing treatment, and quality inspection. The specific steps are as follows:

Raw material selection

High-quality stainless steel material: Select stainless steel raw materials that meet relevant standards. Check the quality certificates of the materials to ensure that their alloy composition, mechanical properties, etc. meet the requirements. For example, for degreased stainless steel pipes used in the food industry, choose stainless steel materials with good corrosion resistance such as 304 or 316L.

Inspect the surface quality of the raw materials: The surface of the raw materials should have no obvious scratches, cracks, sand holes, etc., to avoid these defects from further expanding during subsequent processing and affecting the quality of the pipe.

Processing process control

Cutting accuracy control: Use high-precision cutting equipment such as laser cutting machines, plasma cutting machines, etc., to control parameters such as cutting speed and power to ensure a flat and vertical cutting surface and a small deviation in cutting dimensions within the allowable range.

Bending processing: During bending processing, select appropriate bending radii and bending techniques based on the diameter and wall thickness of the pipe, and use dedicated bending molds to prevent the pipe from cracking or wrinkling.

Welding quality control: If the stainless steel pipe needs to be welded, the welders must have professional qualifications. Use appropriate welding techniques such as argon arc welding, and control parameters such as welding current, voltage, and welding speed to ensure a good weld formation without pores, slag inclusion, or incomplete penetration. After welding, the weld seams need to be polished and polished to achieve a smooth transition with the pipe surface.

Degreasing treatment

Select an appropriate degreasing method: Based on the usage of the pipe and the degree of surface oil contamination, select appropriate degreasing methods such as chemical degreasing, electro-degreasing, or ultrasonic degreasing. For pipes with a lot of surface oil, use chemical degreasing first for rough degreasing, and then use ultrasonic degreasing for fine degreasing.

Strictly control degreasing process parameters: According to the selected degreasing method, strictly control parameters such as degreasing temperature, time, and degreasing agent concentration. Regularly test the concentration and performance of the degreasing agent and replenish or replace it in time to ensure the degreasing effect. After degreasing, thoroughly clean the pipe with water or deionized water to remove residual degreasing agents and impurities on the surface, and then dry it to prevent rusting of the pipe. Quality inspection

Appearance inspection: Conduct a detailed visual inspection of each processed de-luted stainless steel pipe, checking for any scratches, dents, discoloration or other defects on the pipe surface, as well as the smoothness of the welds and the cleanliness of the de-luted surface without any oil residue.

Dimension accuracy measurement: Use measuring tools such as calipers, micrometers, and straightedges to measure the external diameter, wall thickness, and length of the pipe material, ensuring that they meet the design requirements and relevant standards.

De-lution quality inspection: Use methods such as wiping, solvent method, or ultraviolet fluorescence detection method to test the de-lution quality of the pipe surface. For example, the wiping method involves using clean white filter paper to wipe the pipe surface and observing if the filter paper shows any traces of oil contamination; the ultraviolet fluorescence detection method utilizes the characteristic that oil emits fluorescence under ultraviolet light to detect if there is any residual oil on the pipe surface.

Performance testing: Based on the usage requirements of the pipe material, conduct corresponding performance tests, such as mechanical property tests (tensile, bending, impact, etc.) and corrosion resistance tests (such as salt spray test, intergranular corrosion test, etc.), to ensure that the performance of the pipe material meets the usage requirements.