Wuxi Duorunde Steel Tube Co., Ltd (My Answer); ?304 Stainless Steel Precision Tube is a kind of widely used stainless steel seamless precision tubes, and its production standards mainly follow the standards such as GB/T 3091-2015 Welded Steel Tubes for Low-Pressure Fluid Conveying and GB/T 14976-2012 Stainless Steel Seamless Steel Tubes for Fluid Conveying. These standards have clear requirements for the chemical composition, mechanical properties, dimensional accuracy, surface quality and other aspects of 304 stainless steel precision tubes.
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In terms of chemical composition, 304 stainless steel precision tube should be consistent with GB/T 20878-2007 "stainless steel and heat-resistant steel grades and chemical composition" in the provisions. Specifically, the chemical composition of 304 stainless steel should comply with the provisions of Table 1.?
In terms of mechanical properties, 304 stainless steel precision tubes should comply with the provisions of GB/T 14976-2012 "Stainless Steel Seamless Steel Tubes for Fluid Transportation". Specifically, the tensile strength, yield point, elongation and impact work of 304 stainless steel precision tubes should comply with the provisions of Table 2.
In terms of dimensional accuracy, the dimensions of 304 stainless steel precision tubes should be in accordance with the provisions of GB/T 3091-2015 Welded Steel Tubes for Low Pressure Fluid Transportation. Specifically, for the outer diameter and wall thickness of the dimensional deviation should comply with the provisions of Table 3.
? In terms of surface quality, the surface of 304 stainless steel precision tubes should be smooth, flat, without obvious scratches, dents, rust and other defects. In addition, a hydraulic test should be carried out to check whether its pressure resistance meets the requirements.
In addition to the above standards, the manufacturing process for 304 stainless steel precision tubes should also pay attention to the following:
1. Smelting: smelting using electric furnaces or argon arc welding, to ensure the purity of steel.
2. Continuous casting: pour the steel into the continuous casting machine for solidification to form billets. Pay attention to control the cooling speed and temperature, to ensure fine grain, uniform organization of continuous casting billet.
3. Rolling: the billet will be rolled through a number of passes to form seamless steel pipe. Pay attention to the control of rolling temperature, speed and deformation and other parameters, in order to ensure the shape and dimensional accuracy of the steel pipe.
4. Heat treatment: Heat treatment is carried out to adjust its mechanical properties and corrosion resistance. Pay attention to control the heating rate, cooling rate and temperature and other parameters to ensure that the steel pipe to obtain a good overall performance.
5. Surface treatment: polishing, pickling and other treatments to improve the surface quality of steel pipe. Pay attention to control the treatment temperature and treatment time to avoid problems such as over or under pickling.
6. Non-destructive testing: eddy current testing, ultrasonic testing and other non-destructive testing methods to ensure that the internal quality of the steel pipe meets the requirements.
7. Quality Inspection: Conduct quality inspection, including size inspection, surface quality inspection, etc., to ensure that the products meet the standards and customer requirements.
8. Safety Measures: Pay attention to the safety protection of operators, the safe operation of equipment and other aspects of the matter, to ensure the safety and stability of the production process.
9 environmental protection measures: take to reduce noise pollution, reduce energy consumption and other environmental protection measures, the implementation of the green manufacturing concept, to achieve sustainable development of production.? For the manufacturing process of 304 stainless steel precision tubes need to strictly follow the relevant standards and regulations, while paying attention to safety and environmental protection matters in the production process. Only in this way can we produce high-quality 304 stainless steel precision tubes to meet customer demand and improve product competitiveness.