Alloy steel seamless elbow, carbon steel seamless elbow, elbow large stainless steel seamless elbow passivation effect depends both on passivation process, but also on stainless steel stamping elbow material itself, the impact of specific factors elements contained in stainless steel stamping elbow, stainless steel metallurgical structure, stainless steel processing condition, etc. In the composition elements, chromium, nickel is strong passive elements, followed by passivation of iron, therefore, chromium, nickel content is higher, the stronger the passivation of stainless austenitic, ferritic stainless steel stamping elbow with a more uniform structure can be passivated better, martensitic stainless steel after heat strengthened, its microstructure is more phase structure, which is not strong passivation of stainless steel stamping elbow after smooth machined surface passivation better, casting, sand blasting, etc. The resulting surface roughness is not conducive to passivation. Where large stainless steel elbow parts , if no plating or other coating requirements, are generally required in the pretreatment (including pickling go black, polished, etc.) through the passivation treatment before use or when assembled into finished parts. passivated stainless steel stamping elbow can be improved in environmental media thermodynamic stability, prevention of localized corrosion of stainless steel stamping elbow, so that the surface of stainless steel stamping elbow has sufficient cleanliness and can also eliminate thermal processing of stainless steel stamping elbow surface oxide is different from carbon steel elbow stainless steel elbow The main difference is the material, which contains the chemical composition of the surface for a long time will remain elbow will not rust, does not corrode in the use and maintenance of stainless steel elbow matters a lot when you need to pay attention, you need to follow a certain user Using the method, in accordance with the method of accurate and fair use and maintenance. precautions are as follows: 1. Long-term storage of stainless steel elbow, should be regularly checked often exposed machined surfaces should be kept clean and remove dirt, neatly stored in indoor ventilated dry place, stacked or open storage is strictly prohibited. often kept dry and ventilated stainless steel elbow, cage clean and tidy, in accordance with an accurate way to store store 2. installation, can be connected by way of stainless steel elbow Direct device in the pipeline, according to the location of the installation using the normal circumstances, can be installed in any position on the pipeline, but need to facilitate the manipulation of the test, pay attention to the medium flow cutoff stainless steel elbow should be below the vertical upward flow valve, stainless steel elbow can be installed horizontally, stainless steel elbow tightness at installation time to pay attention to prevent leakage thrown, affecting the normal operation of the pipeline. 3 stainless steel elbow ball valve, globe valve, gate valve is used, only for full or fully closed, adjust the flow do not agree with, so sealing surface by erosion, accelerated wear. valve and shut-off valve on the thread has poured seals, hand wheel rotation to tighten the top position, you can prevent media leaks from the filler Large stainless steel elbow in use plays an important role in the use of methods need to be used to ensure that the service life of stainless steel elbow, ensure that the use of the term in the use of stainless steel elbows need to pay attention to what matters: the electrode should be used keeping dry electrodes, titanium calcium type should be dried at 150 ℃ for 1 hour, low hydrogen type shall be approved by 200-250 ℃ dried for 1 hour (not repeated drying, easy to crack or flake coating) to prevent electrode coating viscous oil and other dirt in order to avoid causing increasing carbon content and impact of the weld weldment quality stainless steel elbow short radius larger hardening after welding, prone to cracking and if using the same type of stainless steel stamping elbow welding, must be 300 ℃ preheat and post-weld above about 700 ℃ slow cooling process and if the weldment weld heat treatment is not possible, it should be made of stainless steel stamping elbow electrode. expensive welding weldment should pay attention to the quality of welds, if we can pre-heating processing, use one type of electrodes may be used, ensure welding parts welding. Cangzhou Pipe Factory 24-hour national hotline 0311 -68,031,627 Mobile 15373637303 QQ: 2015693327 Contact: Wang specializes in producing tee fitting 14 years, specializing in the production of oil , dedicated natural gas pipes, elbows, tees, reducers, caps, bends, Address: Development Zone, Yanshan County, Cangzhou En Ti Pipeline Co., Ltd. Company website: www.hebeishenghao.com