With the implementation of China's reform and opening-up policy, the national economy has achieved rapid growth, and a large number of urban residences, public buildings and tourist facilities have been constructed, placing new demands on hot water supply and domestic water supply. Especially with regard to water quality, people are paying more and more attention to it and their requirements are constantly increasing. Here we talk about stainless steel seamless pipe related knowledge.
Stainless steel seamless pipe identification:
A magnetic test
Magnetic testing is the easiest way to distinguish between annealed austenitic stainless steels and ferritic stainless steels. Austenitic stainless steels are non-magnetic steels, but will have mild magnetic properties after cold working under high pressure; pure chrome and low alloy steels are ferromagnetic steels.
Second, nitric acid test
A notable feature of stainless steel pipes is their inherent corrosion resistance to concentrated nitric acid and dilute nitric acid. This property makes it easy to distinguish from most other metals or alloys. However, high-carbon 420 and 440 steels are slightly corrosive when tested with nitric acid, and non-ferrous metals are immediately corroded when they encounter concentrated nitric acid. Dilute nitric acid has a strong corrosive effect on carbon steel.
Three, copper sulfate point test
The copper sulfate point test is the easiest way to quickly distinguish between plain carbon steel and all types of stainless steel. The concentration of the copper sulfate solution used is 5 to 10%.
Before conducting the point test, the test area should be thoroughly cleaned of grease or various impurities, and a small area polished with a soft cloth, and then drop the bottle of copper sulfate solution to the cleaned area. Ordinary carbon steel or iron will form a layer of surface metal copper in a few seconds, while the surface of stainless steel will not produce copper precipitation or show the color of copper.
What is the effect of stainless steel seamless pipe solution treatment?
1. Make stainless steel seamless pipe arrangement and composition uniform
This is particularly important for the material, because the rolling temperature and cooling rate are not the same in each section of the hot rolled pipe, resulting in inconsistent arrangement and structure. At high temperatures, the atomic activity increases, the σ phase dissolves, the chemical composition tends to be uniform, and uniform single-phase arrangements are obtained after rapid cooling.
2. Elimination of work hardening for continuous cold processing
Through solution treatment, the twisted lattice recovers, elongated and broken grains crystallize from the beginning, the internal stress is eliminated, the tensile strength of the steel wire decreases, and the elongation rate increases.
3. The inherent corrosion resistance of rehabilitation stainless steel tubes
Because of the cold processing to form carbides, the lattice defects, so that the stainless steel tube corrosion resistance. After the solution treatment, the corrosion resistance of the seamless stainless steel tube recovered to the best condition.
Today's related content on the identification of stainless steel seamless tube is introduced here, and I hope to be helpful to everyone. If you want to know more relevant information, please continue to pay attention to the information platform of this website. Thank you for your appreciation.
Stainless steel bathroom stainless steel slide stainless steel four open doors pert pipe stainless steel shelves
Accelerator Dpg,Low Speed Accelerator Dpg,An Accelerator To Acm Rubber,Accelerator With Slow Speed Dpg
Jiang Xi Hi-Tech Technology Co.,Ltd. , https://www.hi-techmasterbatch.com