Stainless stee
Stainless steeIn order to ensure that the mechanical properties such as yield 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, titanium, silicon, aluminum, etc.) and the interior of stainless steel coil
According to rolling, it is divided into hot rolled, hot drawn and cold drawn (rolled) stainless steel pipes.
.Inspection: after crimping, check the crimping size with a special gauge.
After the pipeline is installed and the pressure test is qualified, it is better to wash with low chloride ion water and disinfect with 0.03% potassium permanganate.
.Air pressure and water pressure test: conduct water pressure test for pressure resistant pipes one by one, and keep it for no less than 5 seconds at the specified pressure value. The water pressure test of conventional supply is 45MPa. The air pressure test is p = 0.5mpaa.
The difference between duplex stainless steel plate and ferritic 410 stainless steel plate: the comprehensive mechanical properties are better than ferritic stainless steel, especially the plastic toughness, which is not as brittle as ferritic stainless steel.
The heat-treated alloy should be 1900 DEG at low temperature; Annealing treatment at the temperature of F then rapid cooling and water quenching. This treatment is applied to solid melt annealing and stress relief. Stress relief treatment, such as below 1900 DEG; F, which is easy to lead to the precipitation of harmful metal or non-metallic phases.
In polluted air (such as atmosphere containing a large amount of sulfide, carbon oxide and nitrogen oxide), in case of condensed water, acetic acid liquid points will be formed, which will lead to chemical corrosion.
Brinell hardness in stainless steel pipe standards, Brinell hardness is widely used, and the hardness of the material is often expressed by indentation diameter, which is intuitive and convenient. However, it is not suitable for steel pipes with hard or thin steel.
630— Common precipitation hardening stainless steel models, stainless steel coil, stainless steel belt and stainless steel pipe are safe and secure. They are usually also called 17-17% Cr and 4% Ni.
quality standard.The Chinese brand cold rolled non oriented silicon steel strip (sheet) represents: DW + 100 times of iron loss value (at the frequency of 50Hz, the waveform is sinusoidal, and the magnetic induction peak is 5T per unit weight iron loss value) + 100 times of thickness value. For example, dw470-50 represents cold rolled non oriented silicon steel with iron loss value of 7W / kg and thickness of 0.5mm. Now the new model is represented as 50W470.
Performance supplement: main components: 22cr-3ni-2mo-0.16n; national standards: NAS 329j3uns S3 / s3180din / en 446astm a240, ASME sa-240; mechanical properties: tensile strength: & sigma; B & Ge; 0mpa; elongation: & Delta; & Ge; 25%; typical working conditions: 20% dilute,304 stainless steel pipe price, below 60 ℃, annual corrosion rate & amp; lt; 0.1mm; supporting welding wire: er2209. Weight (kg) = length (m) * width (m) * thickness (mm) *Density value specific gravity of stainless steel: ● chromium stainless steel is 75t / m3 ● chromium nickel stainless steel is 93t / m3 ● iron is 87T / m3. Theoretical weight calculation formula of stainless steel plate: Steel theoretical weight length (mm) & times; width (mm) & times; thickness (mm) & times; density value = weight (kg) Stainless steel plate,Stainless steel cup with cover, stainless steel, duplex stainless steel, stainless steel material, Swedish stainless steel brand. The difference between duplex stainless steel plate and austenitic stainless steel plate is that the yield strength is higher than that of ordinary austenite
◆ stainless steel and alloy tool steel (C content is expressed in thousandths), such as 1 thousandth of 1Cr18Ni9 (i.e., stainless C & LE); 0.08%, such as 0Cr18Ni9, ultra low carbon C & le; 0.03% if the international stainless steel mark, the American Iron and Steel Institute uses three digits to mark various standard grades of malleable stainless steel. Among them, austenitic stainless steel is indicated by numbers of 200 and 300 series, and ferritic and martensitic stainless steel is indicated by numbers of 400 series. For example, some common austenitic stainless steels are marked with 20, 30, 316 and 310, ferritic stainless steels are marked with 430 and 446, martensitic stainless steels are marked with 4420 and 440C, duplex (austenitic ferrite), stainless steels, precipitation hardening stainless steels and high alloys with iron content less than 50% are usually named by patent name or trademark.
408— Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
Quality inspection report.Stainless welded pipe (grade y) gb3280-84 stainless cold plate (grade I)
There are various connection modes of stainless steel pipes. The common types of pipe fittings are compression type, compression type, union type, push type, push thread type, socket welding type union flange connection, welding type and derivative series connection mode combining welding with traditional connection. These connection modes have different application ranges according to their principles, but most of them are easy to install, firm and reliable. The sealing ring or gasket materials used for connection are mostly silicone rubber, nitrile rubber and EPDM that meet the requirements of national standards. L stainless steel pipe, s stainless steel pipe, 904L stainless steel pipe and other brand products are provided for a long time. The designated products are complete and the quality is guaranteed, which eliminates the need for use
After the stainless steel pipe is completed, it must be moved, moved and moved for a long distance. If there is no bag, there will be scratches and scratches on the surface, which will affect the appearance of the surface.
.The above conditions can cause corrosion of the protective film on the surface of stainless steel.
Low temperature processing --- martensitic stainless steel is quenched from austenitizing temperature and then cooled to very low temperature to promote the quenching of martensite. It is suitable for stainless steel which is easy to produce retained austenite.
Corrosion fatigue resistant dual phase steel has high corrosion fatigue strength due to its high strength and corrosion resistance. Processing equipment is vulnerable to corrosive environment and loading cycle, and its characteristics are very suitable for such applications. The chemical composition of was determined after 1900 DEG/ 1922° After f (1040 & deg; / 1080 & deg; c) solid melt annealing,Quotation for 2205 stainless steel plate, the ideal microstructure 50 & alpha/ 50 γ . If the temperature of heat treatment is higher than 2000 DEG; F, which may lead to the increase of ferrite composition. Like other duplex stainless steels, alloys are susceptible to intermetallic precipitation. Intermetallic phase at 1300 DEG; F and 1800 & deg; F, at 1600 & deg; At temperature F, the precipitation rate is fast. Therefore, we need to test to ensure that there is no intermetallic phase. Refer to ASTM A 923 for the test. For hot forming we suggest that the forming should be at 600 DEG; Below F. During hot forming treatment, the whole workpiece shall be heated as a whole, and the alloy is very stable at this temperature. If the temperature is too high, the alloy is prone to hot tearing. Below this temperature austenite will fracture. Below 1700 DEG; At F, the intermetallic phase will be formed quickly due to the influence of temperature and deformation. After hot forming, it should be immediately adjusted to 1900 DEG; F and quench to restore its phase balance, toughness and corrosion resistance. We do not recommend stress relief, the material should be as low as 1900 & deg; F, followed by rapid cooling and water quenching.