Thermally Bimetallic Composites/ Bimetallic Stripsare composed of two (or more) metal or alloy component layers with different thermal expansion coefficients.
Bimetallic metallic strip (in Chinese) is also [TJC STEEL]known as Bimetallic metallic strip (in foreign languages), a variety of metallic metallic strip metallic alloys for metallic collar areas Introduction for Bimetallic Strip A precision alloy consisting of two (or more) layers of metal or alloy with different thermal expansion coefficients as components.A group of tubesheets in thermally bimetallic materials have low thermal expansion coefficient and are passive layers.The other group of tubules has a high coefficient of thermal expansion and is the active layer.Sometimes a third or a fourth layer of metal or alloy may be added to obtain a thermally specific bimetal.In general, the passive layer is [TJC STEEL]made of an intile alloy containing Ni34 ~ 50%.The active layer is made of brass, nickel, Fe-Ni-Cr, Fe-Ni-Mn and MN-Ni-Cu alloy.Different types of thermobimetals, such as high temperature, medium temperature, low temperature, high sensitivity, corrosion resistance, resistance and quick action, can be obtained through different combinations of active and passive layer materials. Features for Bimetallic Strip The main parameters for the thermal bimetallic properties are: specific bending.Includes all material properties that affect the amount of thermal bimetal bending.It is an important parameter to measure the sensitivity of thermal bimetals to temperature change.Use temperature range.The range of temperatures at which a thermal bimetal can operate normally.Includes linear temperature range and permissible temperature range.In the linear temperature range, the bending displacement of the thermal bimetal has a linear relationship with the temperature, and the specific bending value is the largest.Allowed to use temperature range greater than linear temperature range.In this range, the internal thermal stress is still lower than the elastic limit of the material and can be used safely, although it is lower than the bending value.Modulus of elasticity.The parameters needed to calculate the thrust torque and internal [TJC STEEL]stress generated by the thermal bimetal element.Resistivity.The parameters of heating temperature of bimetallic elements heated by direct electrification are calculated.The main characteristics of the most commonly used 3Ni24Cr2(active layer)/ 4J36(passive layer) thermobimetal are: specific bending (room temperature ~ 150℃),(13.2 ~ 15.5)×10-6℃-1;Permissible temperature range, -70 ~ +450℃;Linear temperature range, -20 ~ +180℃;Elastic modulus,≥ 16000kGF /mm2;Resistivity (20 + / - 5 ℃), 77 ~ 84 mu Ω · cm. The thermal expansion coefficient of each group is different, and the expansion or contraction amount of each group is different when the temperature changes, the thermal bimetal element as a whole will bend.This [TJC STEEL]characteristic is widely used in temperature measurement, temperature control, temperature compensation and program control.Thermal relays and circuit breakers in the electrical industry, meteorological instruments and galvanometers in the instrumentation industry, electric irons, stoves, refrigerators and air conditioning devices in household appliances are widely used in the thermal bimetallic components. Process for Bimetallic Strip The key process of manufacturing thermal bimetal is the composite process between each component layer.The composite process includes melting, double casting, hot rolling, cold rolling and explosion.The hot rolling method is commonly used, in which the slabs of each component layer are hot-rolled [TJC STEEL]at a high temperature under a large amount of pressure, and then cold rolled.The best product quality is the cold rolling method, in which the slabs with different component layers are cold-rolled and compounded at room temperature with a large amount of pressure, and then conventional cold rolling is carried out.Hot bimetal is usually strip or sheet. Application for Bimetallic Strip Bimetallic strip: thermally bimetallic strip is composed of two or more layers with different linear expansion coefficient of the alloy firmly combined with the composite material.The alloy layer with high coefficient of expansion is called active layer, while the alloy layer with low coefficient of expansion is called passive layer. An intermediate layer can be added between the active layer and the passive layer to adjust the resistance. When the environmental temperature changes, the expansion coefficient of the active layer and the passive layer is different, which causes bending or rotation.This alloy is used for temperature control, temperature compensation, current limitation, temperature indication and other automatic control devices and thermosensitive elements in instruments and meters.Can also be applied to the[TJC STEEL] circuit breaker, switch, thermal relay, all kinds of temperature control components, home appliance protector, electronic protector, overload protector, condensate drain device, temperature controller, thermometer, incubator, meteorological instruments, electric iron, electric rice cooker, refrigerator, fire alarm, fluorescent lamp, oven, lighter, the starter current mode control switch automatically, automatic protection switching rules, etc.Also used in fluids (gas).Liquid) valve switch and other medium and low voltage electrical thermal components. Brief Introduction for DIWA373 Steel Plate:
DIWA373 steel plate is the high-strength steel plate used in the supercritical boiler steam separator, which is the European standard container plate.[TJC STEEL] Standard for DIWA373 Steel Plate: DIWA373 standard: EN10028;HBIS- Wugang production execution standard: WYJ004-2017. Delivery Status of DIWA373 Steel Plate: Normalizing (N), Tempering (T), Quenching ed and Tempering (QT). Smelting Method and Production Process of DIWA373 Steel Plate: DIWA373 is smelted by electric furnace + off-furnace[TJC STEEL] refining + vacuum degassing.Production process: DIWA373 has fine grain, high strength, good weldability, high temperature and high pressure characteristics. Size, Shape, Weight and Allowable Deviation for DIWA373 Steel Plate: The dimension, shape, weight and allowable deviation of DIWA373 steel plate shall be in accordance with EN10029, and the allowable deviation [TJC STEEL]of thickness shall be in accordance with class B deviation of EN10029. Inspection Requirements for DIWA373 Steel Plate: DIWA373 ultrasonic inspection meets the requirements of NB/ t47013.3-2015 standard grade. Application Scope for DIWA373 Steel Plate: DIWA373 is the steel used in supercritical boiler steam separator, which is used in reactor, heat exchanger, separator, spherical tank, oil and gas tank, liquefied gas tank, nuclear reactor pressure shell, liquefied petroleum cylinder, [TJC STEEL]hydraulic turbine volute, etc. Application Prospect for DIWA373 Steel Plate: DIWA373 fine grain steel plate is in 30 years, high strength, weldability, good resistance to high temperature, high pressure steel, belonging to[TJC STEEL] the European standard of pressure vessel with steel plate, type induction for high strength steel boiler steam drum steel, and it is a very large thickness of boiler steel, as steel drum production molding, made of super thick steel plate container looked at was very impressive.DIWA373 is a fine grain, high strength, good weldability, high[TJC STEEL] temperature and high pressure structural steel developed in Germany in 30 years, belongs to the European pressure vessel steel plate, belongs to a special steel plate, this brand boiler drum steel super thickness produced by henan wuyang steel plant, widely used in boiler equipment manufacturing.[TJC STEEL] [email protected] Technical Conditions for DIWA353/ 13MnNiMo5-4 Steel Plate:
1 Scope of Application for DIWA353/ 13MnNiMo5-4 Steel Plate: The technical conditions are applicable to the supply technical requirements of steel plates with thickness range of >100mm ~ 145mm DIWA353 (13mnnimo5-4).[TJC STEEL] 2 Production Way: Steel should be composed of electric furnace smelting, refining and vacuum degassing. 3 Technical Requirements for DIWA353/ 13MnNiMo5-4 Steel Plate: 3.1 Chemical Composition The chemical composition of the steel plate should [TJC STEEL]meet the requirements of table 1, and the control of trace elements according to gb713-1997. Table 1 Chemical Composition(%) C-Si-Mn-P-S-Ni-Mo-Cr-Nb-Alt Heat Analysis ≤0.15 0.10-0.50 1.00-1.60 ≤0.020 ≤0.004 0.60-1.00 0.20-0.40 0.20-0.40 0.005-0.020 ≥0.015 Product Analysis ≤0.17 0.05-0.56 0.95-1.70 ≤0.025 ≤0.005 0.55-1.05 0.15-0.45 0.15-0.45 0.005-0.025 ≥0.015 3.2 Delivery Statusfor DIWA353/ 13MnNiMo5-4 Steel Plate: Normalizing at 890 ~ 950℃ + Tempering at 620 ~ 680℃. 3.3 Allowable Deviations of Size, Shape and Quality The allowable deviation of the size, shape and [TJC STEEL]quality of the steel plate shall conform to the requirements of EN10029, the thickness deviation shall conform to the requirements of class B, and the irregularity shall conform to the requirements of class N. 3.4 Test Plate Mechanics and Process Performance 3.4.1 Mechanical Properties: The mechanical properties (transversal) [TJC STEEL]of the steel plate delivery state should meet the requirements in table 2 Table 2: Mechanical Properties of Steel Plate Thickness/ mm-YIeld Strength Reh MPa,min-Tensile Strength RmMPa-Elongation %,min-Impact Test AKV(0℃)J,min-Bending Test 180° d=3a >100 ≤125380 570~740 18 31 Pass >125≤145 375 Note 1: The impact value listed in the table is the average value of 3 samples, and one impact value is allowed to be lower than the specified value, but not lower than 27J. 3.4.2 High temperature tensile performance [TJC STEEL]of steel plate in delivery state The instantaneous tensile properties of steel plates at high temperature should meet the requirements in table 3. Table 3: Transient Tensile Properties at High Temperature[TJC STEEL] Thickness(mm)Temperature(℃)Rp0.2(MPa)Rm(MPa) >100≤125 350 ≥324 ≥510 >125≤145 350 ≥314 3.5 Simulate Post Weld Heat Treatment The performance data of steel plate simulating post-welding heat treatment are provided. The performance should meet the requirements of table 2. The post-welding heat treatment process is simulated: 600±10℃, the insulation is maintained for 7 hours, and then the temperature is reduced to 400℃ at a speed of less than 100℃/ hour. 3.6 Surface Quality The surface quality of the steel plate shall comply with the requirements of en 10163-2 B2. No cracks, bubbles, scars, folds or [TJC STEEL]inclusions shall be found on the surface of the steel plate.No layering is allowed inside the steel plate.If the above defects exist on the surface of the steel plate, clearance is allowed, [TJC STEEL]but the clearance depth shall not exceed half of the thickness tolerance from the actual size of the steel plate, but the minimum thickness shall be ensured, and the clearance site shall be smooth and transitional.Repair welding is not allowed without the buyer's consent. 3.7 Ultrasonic Inspection Each plate to 100% ultrasonic testing, ultrasonic [TJC STEEL]testing according to the German SEL072 (072) steel supply technical conditions Ⅲ level testing and acceptance.[TJC STEEL] [email protected] Foreign COVID-19 epidemic situation is increasingly severe, due to the impact of the epidemic, the global steel mills to scale down production, and some foreign steel enterprises have taken measures to stop production and reduce production.(for more information, see "attention! Foreign steel enterprises will suspend some production activities due to the outbreak")[TJC STEEL]
Brazilian Steel Mills Are Shutting Down Their Blast Furnaces: On April 3rd Gerdau announced plans to cut production.It said it was closing a 1.5m tonne blast furnace and the remaining operating one could produce 3m tonnes a year.Geldau suspended operations at the Charqueadas furnace plant for 15 days. Usinas Siderurgicas DE Minas Gerais, a steelmaker, said it would close two more blast furnaces and keep only one open, bringing the total to four.Currently, Usiminas steel has an annual capacity of about 2.35 million tons. ArcelorMittal is to close its no. 3 blast furnace at its Tubarao steel plant in espirito santo, Brazil.It is reported that no. 3 blast furnace can produce 2.8 million[TJC STEEL] tons of crude steel annually.The company said it was uncertain how long the furnaces would be shut down and would make adjustments depending on market conditions. Thyssenkrupp Will Reduce Steel Production: Thyssenkrupp, the largest steel producer in Germany, said on Tuesday that it was cutting steel production due to the outbreak of novel coronavirus. A thyssenkrupp Europe steel spokesman said in an email: "we are adjusting the production line due to the current economic impact of COVID 19.These include the operation of blast furnaces and steel processing." The company also said further production cuts were possible, but did not give an exact figure.The working hours of production and management personnel will be reduced and the process is expected to begin in mid-april and continue through early may.[TJC STEEL] Japan Railway Shut Down 8.1 Million Tons Of Capacity: Nippon steel said on Tuesday it would idle two blast furnaces in the eastern and western parts of Japan in response to a drop in demand for steel for cars and buildings during the coronavirus pandemic. The no. 1 blast furnace at the kajima plant in ibaraki prefecture will be shut down in mid-april, and the no. 1 blast furnace at the wakayama plant in wakayama prefecture will be shut down later that month, the company said.The combined capacity of the two furnaces is 15 per cent of the company's total capacity of 54m tonnes of crude steel, or 8.1m tonnes. The company also said that starting this month, its staff will work in locations such as its headquarters and domestic steel plants[TJC STEEL], totaling about 30,000 employees, and will take two more days off each month. Nippon steel announced in February that it would shut down its steel plant and some of its blast furnaces in takeshi, in Hiroshima prefecture in western Japan. Europe's Viohalco Suspended Its Steel Business: According to foreign media reports, on March 30, Viohalco SA announced that Sidenor SA, Sovel SA, Erlikon SA, Praksys SA and Etil SA, its subsidiaries in the Greek steel business, will suspend operations for one month from April 2 to May 3, while its administrative staff will work flexibly.During the above period, the commercial [TJC STEEL]activities and delivery of raw materials of these subsidiaries will not be affected. The decision was made due to continued weak demand in the international steel market and a sharp deterioration in the company's situation due to the current COVID 19 outbreak. Viohalco SA (VIO), a Belgian holding company, is one of Europe's leading metalworking companies with subsidiaries in several European countries and annual revenues of €4.19 billion ($4.6 billion) in 2019. India's Sail Will Suspend Operations At Its Bhilai Steel Plant: According to foreign media reports, due to the outbreak of COVID - 19, steel authority of India (SAIL) Bhilai steel plant has temporarily suspended production on March 28.For this reason, the production of railway steel has come to a standstill. Anirban Das Gupta, chief executive of Bhilai steel, said management had decided to retain some staff to keep key parts of the company running [TJC STEEL]and to encourage others to now work from home.He also said no. 1 and no. 8 blast furnaces, general rail rolling mills, sms-2, sms-3 and most coking equipment would continue to operate. A blast furnace in Visakhapatnam has been shut down in RINL, India Indian state-run steelmaker RINL shut down a blast furnace at its Visakhapatnam steel plant on March 29 as a result of the outbreak, foreign media reported. RINL has an annual production capacity of more than 7.5 million tons and three blast furnaces produce about 180,000 tons of molten iron per day. After the closure of one blast furnace, the daily output will be reduced to 120,000 tons. It is reported that the steel mill can only use raw materials to maintain the operation of two blast furnaces, if the outbreak continues, will not be able to maintain normal operations.In addition, 50 per cent of the company's workforce works from home and steel operations have been restricted. Us Steel Will Idle The No. 4 Blast Furnace At The Gary Steel Plant Indefinitely: U.s.steel corp. decided to idle its no. 4 blast furnace at Gary Works for 48 days in April in response to the global outbreak. The company also idled blast furnace A at its Granite City Works plant and indefinitely idled steelmaking equipment at its Great Lakes Works plant.[TJC STEEL] The company also decided to idle its Lone Star Tubular Operations in Texas and Lorain Tubular Operations in Ohio at the end of may, laying off 850 workers. U.S. steel plans to cut capital spending by $125 million in 2020, and $750 million after that, and to delay equipment construction at Mon Valley and halt upgrades to the hot strip strip at the Gary plant.[TJC STEEL] [email protected] |
TJC STEELNEWS& KNOWLEDGE TJC Archives
December 2024
Categories |
TJC IRON& STEEL CO.,LTD
EMAIL: [email protected]
HENAN SCALE IMP&EXP CO.,LTD
ZHENGZHOU ZHIYUAN IMP&EXP CO.,LTD
COPYRIGHT © 2015