304 stainless steel pipe is a widely used pipe with excellent corrosion resistance, heat resistance, and fatigue resistance. It is widely used in the chemical industry, petroleum, pharmaceutical, machinery, aerospace, and other fields.

1. 304 stainless steel pipe standard
①International standards: The international standard for 304 stainless steel pipes is ASTM A312/A312M, which stipulates the chemical composition, mechanical properties, manufacturing process, etc. of 304 stainless steel pipes.
②Domestic standards: The domestic standards for 304 stainless steel pipes are GB/T 14975-2012, GB/T 14976-2012, GB13296-2013, etc. These standards involve regulations on the use, outer diameter, and wall thickness of 304 stainless steel pipes.
③Industry standards: In addition to international standards and domestic standards, 304 stainless steel pipes also have some industry standards, such as petroleum standard SY/T 0510-2008, chemical industry standard HG/T 20537-1992, etc.

2. Application of 304 stainless steel pipe
①Chemical industry: In the chemical industry, 304 stainless steel pipes are widely used to transport various dilute acids, concentrated acids, hydrochloric acid, hydrofluoric acid, sodium hydroxide, potassium hydroxide, and other media.
②Petroleum: In the petrochemical industry, 304 stainless steel pipes are usually used to transport high-temperature, high-pressure oil, natural gas, and other media.
③Pharmaceutical: 304 stainless steel pipes are widely used in the pharmaceutical field and can be used for transporting various medicinal liquids, medicinal liquid impregnation, filtration, and other process operations.
④Aerospace: 304 stainless steel pipes are also widely used in the aerospace field, such as aircraft engine exhaust pipes, engine intake pipes, hydraulic pipelines, etc.

3. Manufacturing process of 304 stainless steel pipe
① Cold drawing: Cold drawing is one of the main processes for manufacturing 304 stainless steel pipes, which can improve the dimensional accuracy and surface quality of the pipes.
② Hot rolling: Hot rolling is the main process for manufacturing 304 stainless steel pipes with large diameters and thick walls.
③Cold rolling: Cold rolling is mainly used to manufacture 304 stainless steel pipes with thin wall thickness and high surface precision requirements.

4. Quality control of 304 stainless steel pipes
①Chemical composition control: The chemical composition of 304 stainless steel pipes should comply with relevant standards.
② Mechanical property control: The mechanical properties of 304 stainless steel pipes include tensile strength, yield strength, elongation, etc., and should comply with relevant standards.
③Appearance control: The appearance of 304 stainless steel pipes should be flat and smooth, without defects such as cracks, wrinkles, oxide skin, etc.

The above introduces the standards and application guidelines for 304 stainless steel pipes, covering many aspects such as the standards, applications, manufacturing processes, and quality control of 304 stainless steel pipes. In a wide range of application fields, 304 stainless steel pipes have been well evaluated and applied, while the manufacturing process and quality control have also been improved.