The slab solidified on the surface continues to be rapidly cooled through the secondary cooling section until the core becomes solid， and the whole continuous casting process of stainless steel pipe fittings is completed.
When water-soluble paper is used to block the ventilation， due to the ventilation from the weld center， the ventilation pipe shall be pulled out quickly at the later sealing link， and the residual argon inside shall be used for protection， so as to quickly finish the bottom and seal the mouth.
Balzar(III) steel exports grew rapidly. The supply and demand of domestic steel market is unbalanced， and the export of enterprises. From January to June， China exported . million tons of steel， a year-on-year increase of %; . million tons of steel were imported， down % and tons of billets and ingots were imported，Balzar904L plate stainless steel， up %. Converting billets into crude steel， the cumulative net export was . million tons， a year-on-year increase of %， accounting for % of China"s crude steel output. In terms of export price， the average export price of bars and wires from January to June was US dollars per ton， a year-on-year decrease of %; US $ tons of plate， a year-on-year decrease of %.
Duplex stainless steel product description: This stainless steel has good corrosion resistance in urea carbamate solution and high stress corrosion cracking resistance in chloride environment. At the same time， the duplex stainless steel has excellent mechanical properties and can be used in plant construction with high safety requirements.
CheeseStainless steel pipe packing bag is nothing more than the function of protecting the surface of stainless steel pipe， so most stainless steel pipe users do not have to question this point.
Ferritic stainless steel the Cr content of ferritic stainless steel is generally % ~ %， and the carbon content is less than .%. Other alloying elements are sometimes added. The metallographic structure is mainly ferrite， and there is no & alpha during heating and cooling=& amp; amp; gt;& gamma; The transformation cannot be strengthened by heat treatment. Strong oxidation resistance. At the same time， it also has good hot workability and certain cold workability. Ferritic stainless steel is mainly used to make components with high corrosion resistance and low strength requirements. It is widely used in manufacturing equipment such as production， nitrogen fertilizer and chemical pipelines.
There are three main reasons for oxidation of stainless steel: production process， forming a thin oxide film on the product surface is the basic process to avoid oxidation， renewable resources business and business package Including: stainless steel plate， stainless steel coil， stainless steel belt and stainless steel pipe. However， when the oxide film is incomplete and discontinuous due to insufficient or negligent production process the oxygen in the air will directly react with some elements in the product， resulting in the appearance of oxidation of the product.
Stainless steel pipes and water transmission equipment for fluid transportation such as water and gas are advanced basic water purification materials in the world. They have strong anti-corrosion performance， which can not be compared with cast iron pipes， carbon steel pipes and plastic pipes.
In order to ensure that the mechanical properties such as yield strength， tensile strength， elongation and hardness of various stainless steel coils meet the requirements， the stainless steel coils must undergo heat treatment such as annealing， solution treatment and aging treatment before delivery. The corrosion resistance of stainless steel coil mainly depends on its alloy composition (chromium， nickel， titanium， silicon， aluminum， etc.) and the internal structure of stainless steel coil，
Rheological and thermal changes in the quenching process of decorative stainless steel pipe the cooling characteristics of submerged quenching of stainless steel plate are numerically simulated by using the Euler multi fluid model in AVL fire software and the numerical results are compared with the experimental results. In the research， the quenching medium is water. The mass， momentum and energy equations of gas-liquid two-phase of quenching medium and the quenching heat conduction equation of stainless steel workpiece are solved by numerical simulation. Based on the principle of equal heat flux between quenching medium and workpiece， and can be extended to the multiphase flow simulation in complex system to guide the actual production. The single pass thermal simulation compression experiment of Cr super martensitic stainless steel was carried out by Gleeble thermal simulation tester to study the thermal deformation behavior at ~ ℃ and strain rate of . ~ s-， and the microstructure evolution law of grains under different conditions was analyzed; Based on Sellars hyperbolic sinusoidal model， the flow stress constitutive equation of Cr super martensitic stainless steel was constructed. The results show that the peak stress decreases with the increase of deformation temperature and the decrease of strain rate; With the increase of deformation temperature， the grain grows and coarsens gradually. With the increase of strain rate， the dynamic recrystallized grains are obviously refined. The thermal deformation activation energy Q = . JMOL of decorative stainless steel pipe is calculated， and the expression of Zener Hollomon parameter is obtained. Different feedstocks were prepared by mixing crmnmon nickel free austenitic stainless steel powder prepared by aerosol and wax based binder. The effects of binder ratio and powder loading on the rheological properties of feed were studied by rh high pressure capillary rheometer. Non Newtonian index n， viscous flow activation energy E and comprehensive rheological factor alpha are calculated by second order model regression analysis; STV. The results show that the prepared feeds are pseudoplastic fluid. The binder system was composed of % microcrystalline wax (MW)， % high density polyethylene (HDPE)， % ethylene vinyl acetate copolymer (EVA) and % stearic acid (SA). The powder loading was vol%. The feed had good comprehensive rheological properties. In order to study the cementitious properties of stainless steel AOD slag， stainless steel AOD slag was used to replace some cement， and its effects on the working properties and mechanical properties of cement mortar were studied. The results show that using stainless steel AOD slag to replace cement from ~ %， with the increase of the content of stainless steel AOD slag， the water consumption of standard consistency of cement first decreases and then increases. When the content is %， the water reduction effect of stainless steel AOD slag is good; With the increase of the content of stainless steel AOD slag， indicating that the cementitious activity of stainless steel AOD slag is small.
Market trendStainless steel has been used as a structural material for building new buildings and repairing historic sites for more than years. Early designs were calculated according to basic principles. Today， design codes， are used
Add a small amount of sulfur and phosphorus to make it easier to cut.
Raw materials -- strip splitting -- welded pipe making -- heat treatment -- Correction -- straightening -- end repair -- pickling -- Hydrostatic Test -- Inspection (spray printing) - packaging -- delivery (warehousing) (pipes for welded pipe industrial piping).
Several kinds of stainless steel backing welding used for stainless steel backing welding usually adopt TIG process. According to the actual situation of the site， professional L stainless steel pipe， s stainless steel pipe， L stainless steel pipe and other special products， old brands， with advantages in price and guaranteed quality. We can use the following four kinds of backing welding.
packingWhen the stainless steel fixed port is welded it will be difficult to ventilate on both sides of the weld. At this time， how to ensure the argon filling protection on the inner side of the weld has become a difficult problem. For a long time， facing the national high price， the reasonable price and perfect service of all kinds of stainless steel plates， stainless steel coils， stainless steel belts and stainless steel pipes have been recognized by the majority of customers. In the actual construction on site， we use two welding joints The above problems were successfully solved by plugging with water-soluble paper on the side， ventilation from the weld center and sealing with adhesive tape on the outside (see Table ).
This kind of steel pipe can be divided into stainless steel seamless steel pipe and stainless steel welded steel pipe (slotted pipe). According to different manufacturing processes， it can be divided into several basic types: hot rolling，BalzarColor stainless steel plate factory， cold drawing and cold rolling. According to the section shape it can be divided into circular pipe and special-shaped pipe. Circular steel pipe is widely used， but there are also some square， rectangular， semicircular， hexagonal， equilateral triangle Octagonal and other special-shaped stainless steel pipes.
Model & mdash; High strength cutting tool steel，Balzar420F stainless steel plate， with slightly higher carbon content， can obtain higher yield strength after appropriate heat treatment， and the hardness can reach hrc. It belongs to hard stainless steel. A common application example is & ldquo; Shaving blade & rdquo;. There are three common models: C and f (easy to process).
BalzarBody austenitic stainless steel seamless steel pipe and welded steel pipe stainless steel pipe for mechanical structure stainless steel pipe for ordinary pipe stainless steel pipe for boiler， stainless steel pipe for heat exchanger and seamless steel pipe for chemical industry (crnit) qhyad crnimosi duplex stainless steel seamless steel pipe. Stainless steel is mainly used in the automobile industry， accounting for more than % of the total consumption of automobile stainless steel， and % is ferritic stainless steel. The exhaust gas produced by automobile engine is from the rear of intake pipe， front pipe， hose， converter and center pipe. The common steel grades of exhaust system are L， l etc. it is mainly used in automobiles Stainless steel welded pipe. It is estimated that the stainless steel pipe used in automobile accounts for about % of the consumption of stainless steel pipe in the whole downstream. L stainless steel pipe， s stainless steel pipe and L stainless steel pipe are provided for a long time. The products are complete， excellent quality and favorable price. The use ratio of stainless steel pipe and welded pipe is about :.
& mdash; high strength cutting tool steel， with slightly higher carbon content can obtain higher yield strength after appropriate heat treatment， and the hardness can reach hrc. It is one of the hard stainless steels. A common application example is & ldquo; shaving blade & rdquo;. There are three common models: C and f (easy processing type).
Corrosion resistance of decorative stainless steel pipe the price of different series of stainless steel materials varies greatly. The corrosion resistance of more economical materials can not meet the higher application requirements， and the improvement of corrosion resistance of stainless steel materials by simple chemical passivation is limited. On the other hand， and the passivation treatment of stainless steel has turned to the direction of environmental friendliness. Recently， citric acid passivation and silicon treatment on stainless steel surface have become a new research direction. The former has environmental protection characteristics because its passivation solution component does not contain chromium salt. The latter has found that silicon coupling agent is chemically adsorbed on the metal surface to form a protective silicon film with cross-linked network structure. The length of discoloration time of samples after different surface treatments was compared by blue dot method， the corrosion rate of samples after different surface treatments was distinguished by brine immersion test， and the salt spray resistance of samples after different surface treatments was distinguished by neutral salt spray test， The differences of pitting corrosion resistance and resistance to corrosive medium of samples after different surface treatment were compared by electrochemical test. The film thickness of silicon film was indirectly characterized by film weight test， and scanning electron microscope， energy spectrometer， X-ray diffraction X-ray photoelectron spectroscopy and total reflection Fourier transform infrared spectroscopy characterized the surface films of different surface treated samples， and analyzed the structural composition and corrosion resistance mechanism of different films. Professional stainless steel plate， stainless steel coil， stainless steel belt， stainless steel pipe， high price， service， on-site settlement， honest management! At present， there are few studies on the combination of citric acid passivation and silicon treatment of stainless steel. Therefore， silicon treatment and the combination of citric acid passivation and acid silicon system treatment， and discusses the corrosion resistance mechanism of different films on its surface， which can provide reference for the new direction of stainless steel surface treatment， It has certain practical guiding significance. The corrosion resistance and mechanism of chemical passivation， silicon treatment and composite treatment of martensitic stainless steel were studied in this paper. The comprehensive comparison of the research results shows that the corrosion resistance of stainless steel treated with different surface treatments is different. The corrosion resistance of the sample treated with silicon alone is better than that treated with traditional dichromate passivation. The corrosion resistance of the composite treated sample treated with citric acid passivation and acid silicon system is further enhanced than that treated with acid silicon system alone. The composite treatment of citric acid passivation and acid silicon system treatment has excellent corrosion resistance and environmental protection characteristics， and is expected to replace the traditional dichromate passivation treatment. According to the film weight test results， the surface silicon film weight of the composite treated sample after citric acid passivation and acid silicon system treatment is lower than that of the sample after acid silicon system treatment alone， indicating that the excellent corrosion resistance of the composite film not only depends on the surface silicon film， but also benefits from its double-layer film structure.