Basic knowledge of boiler tube Business Articles | December 22 Authentic Kris Letang Jersey , 2015
Basic knowledge of boiler tube ? 1, an overview of the (1) manufacturing method: (1) general boiler tube temperature under 350 , the domestic pipe mainly use 10, 20 carbon steel hot rolled or col...


Basic knowledge of boiler tube


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1, an overview of the


(1) manufacturing method:


(1) general boiler tube temperature under 350 , the domestic pipe mainly use 10 Authentic Derek Grant Jersey , 20 carbon steel hot rolled or cold drawn tube manufacture.


(2) high pressure boiler tubes are often in high temperature and high pressure conditions, when using the pipe under the action of high temperature flue gas and water vapor, oxidation and corrosion will happen. Requirements of steel pipe with high rupture strength, high oxidation corrosion resistance, and have good organizational stability.


(2) use:


(1) general boiler tube is mainly used to produce water wall tube, water pipe Authentic Bryan Rust Jersey , superheated steam tube, locomotive boiler superheated steam pipe, large and small pipe and tube arch brick, etc.


(2) high pressure boiler tube is mainly used to manufacture high-pressure and ultrahigh-pressure boiler superheater tubes, reheater tube, airway Authentic Justin Schultz Jersey , such as main steam pipe.


(2) GB5310-2008 "high pressure boiler seamless steel tube" regulation. Chemical composition test method by GB222-84 and the steel and alloy chemical analysis method, GB223 iron and alloy chemical analysis method "in the relevant section.


(3) the chemical composition of imported boiler steel pipe inspection on this standard stipulated in the contract.


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Boiler tube adopts steel grade


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(1) the high quality carbon structural steel grade 20 g, MNG, 20 MNG.


(2) 15 mog, alloy structural steel steel grade 20 crmog mog, 12 Authentic Olli Maatta Jersey , 15 crmog, 12 cr2mog, 12 crmovg, 12 cr3movsitib, etc.


(3) heat resistant steel rust common cr18ni9, 1 cr18ni11nb boiler tube in addition to guarantee the chemical composition and mechanical properties Authentic Mario Lemieux Jersey , by the root do water pressure test, flaring, flattening test. Steel tube to heat treatment state delivery.


In addition, the microstructure and grain size of finished steel pipe, the decarburization layer also has certain requirements.


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The physical properties of boiler tube inspection


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(1) GB3087-2008 "low medium pressure boiler seamless steel tube" regulation. Tensile test according to GBT228-87, hydrostatic test according to GBT241-90 Authentic Sidney Crosby Jersey , flattening test according to GBT246-97, flaring test according to GBT242-97, cold bending test according to GB244-97.


(2) GB5310-2008 "high pressure boiler seamless steel tube" regulation. Hydrostatic test and flattening test and tensile test, the same GB3087-82; Impact test press GB229-94, flaring test according to GBT242-97, grain size test according to YBT5148-93; Decarburization layer microstructure inspection by GB13298-91 Authentic Jake Guentzel Jersey , inspection by GB224-87, ultrasonic inspection according to GBT5777-96.


(3) the import and the physical properties of the boiler tube inspection and indicators relevant standards stipulated in the contract.


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Boiler tube is mainly import and export situation


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(1) boiler tube major importing countries are Japan, Germany. Often import the specifications of the 15914.2 mm; 2734.0 mm; 219.110.0 mm; 41975 mm; 406.460 mm, etc. Minimum specification is 31.84.5 mm, length is usually 5 ~ 8 m.


(2) in the case of the imported claim, Germany mannesmann seamless boiler tube Authentic Matt Murray Jersey , pipe mill imported ST45 by ultrasonic testing of census, found that a small number of internal defects of steel pipe more than the factory regulations and German steel association standards.


(3) from Germany imported alloy steel pipe, steel grade are 34 crmo4 and 12 crmov, etc. This kind of steel tube high temperature performance is good, commonly used for high temperature boiler steel pipe.


(4) alloy?Steel??tube imported from Japan more, specifications mm5 426.012 ~ 8 m; 152.48.0 mm12m; 89.110.0 mm6m; 101.610.0 mm12m; 114.38.0 mm6m; 127.08.0 mm9m Authentic Derick Brassard Jersey , etc. Japanese industrial standard execution JISG3458 STPA25 steel grade. This kind of steel pipe used for matching with high temperature alloy tube.


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