Zhumadian Shangcai GB5310 high pressure boiler tube has good spot shipment> 30 ～ 50 ± 0.3> 3 ～ 20 ± 10% Mechanical properties: standard grade tensile strength (MPa) yield strength (MPa) elongation (%) hardness GB308710335 ～ 475 ≥195≥24 / 20410 ～ 550≥245≥20 / GB531020G410 ～ 550≥245≥24 / 20MnG≥415≥240≥22 / 25MnG≥485≥275≥20 / 15CrMoG440 ～ 0≥235≥21 / 12Cr2MoG450 ～ 600≥280 ≥20 / 12Cr1MoVG470 ～ 0≥255≥21 / 12Cr2MoWVTiB540 ～ 735≥345≥18 / 10Cr9Mo1VNb≥585≥415≥20 / ASME SA210SA210A-1≥415≥255≥30≤143HBSA210C≥485≥275≥30≤179HBASME SA213SA213 T11≥ 415≥205≥30≤163HBSA213 T12≥415≥220≥30≤163HBSA213 T22≥415≥205≥30≤163HBSA213 T23≥510≥400≥20≤220HBSA213 T91≥585≥415≥20≤250HBSA213 T92≥620≥440≥20 ≤250HBDIN17175ST4 8 / Ⅲ410 ～ 530≥255≥21 / 15Mo3450 ～ 600≥270≥22 / 13CrMo44440 ～ 590≥290≥22 / 10CrMo910480 ～ 630≥280≥20 / Chemical composition: Standard grade chemical composition (%) / min Project scope Boiler tubes are mainly used for water-cooled wall tubes, boiling tubes, superheated steam tubes Locomotive boiler superheated steam pipe, large and small smoke pipe, arch brick pipe. The selection of the interlayer temperature of Hunan 2 with excellent quality stipulates in the Marketing Department GB5310-2008 "Seamless Steel Pipe for High Pressure Boilers". Tensile test, hydraulic pressure test and flattening test are the same as GB3087-82; impact test is GB229-9; flaring test is GB / T242-9; grain size test is YB / T5148-93; microscopic inspection is GB13298-9. Decarburized layer inspection shall be in accordance with GB224-8. Ultrasonic inspection shall be in accordance with GB / T5777-96. Zhu Caidian's Shangcai GB5310 high pressure boiler tube has good spot shipments. Boiler tubes are divided into two categories: GB3087-2008 medium and low pressure boiler tubes and GB5310-2008 high pressure boiler tubes for low and medium pressure boilers. ℃) heating surface tube. 1 Basic content TPCO high-pressure boiler tube standard: GB3087 —— Standard GB5310 —— Standard ASME SA210 —— American Boiler and Pressure Vessel Code ASME SA213 —— American Boiler and Pressure Vessel Code DIN17175 —— German Industrial Standard Use: For high pressure boilers ( Working pressure is generally above 8Mpa, working temperature is between 450 ℃ ～ 650 ℃) heating surface pipes, economizers, superheaters, reheaters, pipes for petrochemical industry, etc. Welcome to GB / T17396-2007 (Hot rolled seamless steel pipe for hydraulic pillars). Mainly used in coal mine hydraulic supports and cylinders and columns, as well as other hydraulic cylinders and columns. Its representative materials are 20, 4 27SiMn and so on. The pursuit of quality
Zhu Caidian Shangcai GB5310 high-pressure boiler tubes are in good shipment from stock. 2 Process flow overview Hot rolled (seamless steel pipe): round tube billet → heating → perforation → roll diagonal rolling, continuous rolling or → stripping → sizing (or reducing) → Cooling → billet tube → straightening → hydraulic test (or flaw detection) → marking → storage. The bolt test rod is made of T91 steel with a diameter of 8 mm and a depth of 0.5 mm. The bottom plate is made of 13CrMo steel and a thickness of 20 mm. The test is performed without preheating, preheating 150 ° C, preheating 200 ° C, and preheating 250 ° C. The electrode is J707. The welding current is 165 to 170 A, and the arc voltage is 21 to 267 V. The test results are shown in Table 2. Boiler tube 20G quality carbon structural steel grades are 20 20Mn 25MnG. Boiler tubes are made of high-quality carbon structural steel with steel numbers of 20 20Mn 25MnG. Zhumadian Shangcai 2 186 8 237 service is the classification of advanced steel pipes: steel pipes are divided into two categories: seamless steel pipes and welded steel pipes (seamed pipes). According to the cross-sectional shape, it can be divided into round pipes and special-shaped pipes. Round steel pipes are widely used, but there are also special-shaped steel pipes such as square, rectangular, semi-circular, angular, equilateral, and angular. For steel pipes subjected to fluid pressure, hydraulic tests are performed to check their pressure resistance and quality. They do not occur under the specified pressure, or they are qualified. Some steel pipes also need to be crimped and flared according to the standards or the requirements of the buyer. , Crush test, etc. GB / T8163-2008 (Seamless steel pipe for fluid transfer). Mainly used in engineering and large-scale equipment to transport fluid pipelines. Representative materials (brands) are 20, Q345, etc. Free answer Hotan T91 steel contains trace nitrogen, the role of nitrogen is reflected in two aspects. In terms of solid solution strengthening, the solubility of nitrogen in steel is very small at room temperature. The T91 steel post-weld heat-affected zone will have a solid solution and precipitation process of VN in the process of welding heating and post-weld heat treatment: heat effect during welding heating Due to the dissolution of VN in the austenite formed in the zone, the nitrogen content increases, and the degree of supersaturation at room temperature increases thereafter. How much pressure can the Zhuhaidian Shang Cai GB5310 high pressure boiler tube withstand, and there is a small VN in the subsequent post-weld heat treatment Precipitation, which increases stability and increases the endurance strength value of the heat-affected zone. On the other hand, T91 steel also contains a small amount of A nitrogen and can form A1N with it. In Zhumadian Shangcai GB5310 high pressure boiler tube welding process, A1N is dissolved in the matrix in a large amount above 1 100 ℃, and it is re-precipitated at a lower temperature, which can reach Good dispersion strengthening effect. Zhumadian Shangcai GB5310 high-pressure boiler tube has good spot shipments of alloy steel pipes imported from Germany. The steel grades are mainly 34CrMo4 and 12CrMoV. This kind of steel pipe has good high temperature performance and is often used as a high temperature boiler steel pipe. Range N 0.03-0.07 Test conclusion
Zhumadian Shangcai GB5310 high-pressure boiler tubes are in good spot shipment. Upper yield point (σsu): Large stress before the sample yields and the force decreases for the first time. Lower yield point (σsl): When the initial transient effect is not taken into account, the small stress. High-quality recommended high-pressure boiler tubes are often in high temperature and pressure when used. The tubes will be oxidized and corroded when they are used as boiler tubes for high-temperature flue gas and water vapor. The steel pipe is required to have high endurance strength. Zhumadian Shangcai GB5310 high pressure boiler tube is quoted. It has high oxidation and corrosion resistance and good stability. Free answer YB / T5035-1993 (seamless steel pipe for automobile axle shaft casing). Mainly used for high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel tubes for automobile half-shaft casings and drive axles. Its representative materials are 4 45Mn 40Cr, 20CrNi3A, etc. Alloy structural steel steel No. 15Mo 20Mo 12CrMo 15CrMo 12Cr2Mo 12CrMoV 12Cr3MoVSiTiB and so on. GB5310-95 "Seamless Steel Tubes for High Pressure Boilers" The outer diameter of hot rolled tubes ranges from 22 to 530mm and the wall thickness ranges from 20 to 70mm. Cold-drawn (cold-rolled) pipe has an outer diameter of 10 to 108 mm and a wall thickness of 0 to 0 mm. It is safe to use a steel ball or cemented carbide ball with a fixed diameter. With a specified test force (F) on the surface of the sample, the test force is removed after a prescribed holding time, and the indentation diameter (L) of the sample surface is measured. The Brinell hardness value is a quotient obtained by dividing the test force by the spherical surface area of the indentation. Expressed in HBS (steel ball), the unit is N / mm2 (MPa). "Seamless steel tubes for high pressure boilers" The outer diameter of the hot-rolled tube is 22 ~ 530mm, and the wall thickness is 20 ~ 70mm. Cold-drawn (cold-rolled) tube outer diameter is 10 ~ 108mm, wall thickness varies from 0 ~ 0mm.