First, what are the implementation standards for stainless steel welded pipes?
There are multiple standards for stainless steel welded pipes. The following are some of the main implementation standards:
1. GB/T 12771-2024: This is the latest implementation standard for stainless steel welded pipes, which specifies the classification, specifications, material requirements, manufacturing processes, and quality control requirements of stainless steel welded pipes. Stainless steel welded pipes are divided into four types: austenitic stainless steel welded pipes, ferritic stainless steel welded pipes, austenitic-ferritic stainless steel welded pipes, and high-alloy stainless steel welded pipes. The standard also specifies in detail the test methods for stainless steel welded pipes, including surface quality, mechanical properties, chemical composition, non-destructive testing, pressure testing, etc.
2. GB/T 12771-2008: Although GB/T 12771-2024 has replaced this standard, GB/T 12771-2008 was previously widely used to guide the production and quality control of stainless steel welded pipes for fluid transportation. This standard mainly stipulates the technical requirements, test methods, inspection rules, packaging, marking, and quality certificates of stainless steel welded steel pipes for fluid transportation. It is mainly used to transport low-pressure corrosive media. Representative materials are 06Cr19Ni10, 022Cr19Ni10, 06Cr19Ni110Ti, 00Cr17, 0Cr18Ni11Nb, 06Cr17Ni12Mo2, etc.
3. GB/T 12770-2012: This standard applies to stainless steel welded steel pipes for mechanical structures, mainly used for machinery, automobiles, bicycles, furniture, hotel and restaurant decoration, and other mechanical parts and structural parts. Its representative materials are 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
In addition, there are other implementation standards related to stainless steel welded pipes, such as GB/T 14976-2012 “Stainless steel seamless pipe for fluid transportation” and GB/T 20833-2008 “Austenite-ferrite duplex stainless steel seamless pipe”. These standards put forward different technical requirements and quality control measures for different types of steel pipes to ensure the performance safety and reliability of steel pipes in various use environments.
Second, the production process of stainless steel welded pipes
1. Raw material preparation: Select high-quality stainless steel plates as raw materials, cut, level and clean them to ensure the quality of raw materials.
2. Rolling: The cut stainless steel plates are rolled by a rolling machine to form a tube.
3. Welding: The rolled stainless steel pipes are welded. Commonly used welding methods include arc welding, TIG welding, and high-frequency welding. The welds must be deoxidized and cleaned to improve the welding strength and quality.
4. Cold drawing: cold drawing the welded stainless steel pipe, that is, putting the steel pipe into the cold drawing machine for drawing, to improve the dimensional accuracy and surface finish of the steel pipe.
5. Pickling: remove the oxide layer and welding slag on the surface of the steel pipe by pickling, making the surface of the steel pipe smoother and improving its corrosion resistance.
6. Annealing: anneal the pickled steel pipe, that is, keep it at a high temperature for a certain period to make the internal structure of the steel pipe uniform, eliminate the stress generated during welding, and improve the physical properties of the steel pipe
7. Flattening: flatten the annealed stainless steel pipe, that is, flatten the steel pipe into the required shape and size by a press.
8. Cutting: cut the flattened stainless steel pipe according to customer requirements to achieve the required length.
9. Inspection: perform appearance inspection and dimensional inspection on the cut stainless steel pipe to ensure that the quality and dimensional accuracy of the steel pipe meet the standard requirements.
10. Packaging and storage: Pack the stainless steel pipes that have passed the inspection. Common packaging methods include plastic bag packaging and wooden box packaging to protect the steel pipes from external damage and store them.
The above are the general steps of the stainless steel welded pipe production process. Each step requires strict operation and control to ensure the quality and performance of the final product.
Post time: Nov-14-2024