T91 high pressure simbi pombi yehutano vimbiso
T91 simbi imhando nyowani yemartensitic inodzivirira kupisa simbi yakagadzirwa neAmerican National elephant ridge laboratory uye Metallurgical Materials Laboratory yeAmerican combustion engineering company. Pahwaro hwe9Cr1MoV simbi, inoderedza kabhoni yemukati, inonyatso dzikamisa zviri mukati mesarufa uye phosphorus, uye inowedzera hushoma vanadium uye niobium yealloying.
Simbi yegiredhi yeT91 isina musono simbi pombi inoenderana neT91 simbi ndeye x10crmovnnb91 kuGermany, hcm95 kuJapan uye tuz10cdvnb0901 kuFrance.
Element content
S ≤0.01
Si 0.20-0.50
Cr 8.00-9.50
Mo 0.85-1.05
V 0.18-0.25
Nb 0.06-0.10
N 0.03-0.07
Ni ≤0.40
Imwe neimwe alloy element muT91 Steel inoita basa rekusimbisa mhinduro yakasimba, kupararira kusimbisa uye kugadzirisa oxidation kuramba uye corrosion kuramba kwesimbi. Ongororo chaiyo ndeyotevera.
①Carbon ndicho chinhu chiri pachena chekusimbisa mhinduro musimbi. Nekuwedzera kwekabhoni yemukati, simba renguva pfupi resimbi rinowedzera uye mapurasitiki uye kuoma kunoderera. Kune martensitic simbi yakadai seT91, kuwedzera kwekabhoni yemukati kunomhanyisa spheroidization uye aggregation yecarbide, kukurumidza kugovaniswa kwezvinhu alloy uye kuderedza weldability, corrosion resistance uye oxidation kuramba kwesimbi. Naizvozvo, simbi inodzivirira kupisa kazhinji inoda kuderedza kabhoni, zvisinei, kana kabhoni yemukati yakadzikira, simba resimbi rinodzikira. Kuenzaniswa nesimbi ye12Cr1MoV, iyo kabhoni yeT91 simbi inoderedzwa ne20%, iyo inotarwa nekunyatsofunga nezve pesvedzero yezvinhu zviri pamusoro.
②T91 simbi ine trace nitrogen, uye basa renitrogen rinoratidzwa muzvikamu zviviri. Kune rumwe rutivi, inobata basa rekusimbisa mhinduro yakasimba. Kunyungudika kwenitrogen musimbi patembiricha yekamuri idiki kwazvo. Mukuita kwekupisa kupisa uye post weld kupisa kurapwa, VN yakasimba mhinduro uye kunaya kwemvura kuchaitika zvakatevedzana mune post weld kupisa kwakakanganisika zone yeT91 Steel: iyo austenitic chimiro chakaumbwa munzvimbo yakakanganiswa kupisa panguva yekupisa kupisa inowedzera iyo nitrogen yemukati nekuda kwe kuparara kweVN, uye ipapo dhigirii re supersaturation mune yakajairwa tembiricha chimiro chinowedzera, mune inotevera post weld kupisa kurapwa, kune yakanaka VN inonaya, iyo inowedzera iyo microstructure kugadzikana uye inovandudza simba risingaperi rekupisa kwakakanganiswa nzvimbo. Kune rimwe divi, T91 simbi zvakare ine shoma shoma yeA1. Nitrogen inogona kugadzira A1N nayo. A1N inonyungudutswa mumatrix chete kana iri pamusoro pe1100 ℃ uye inonaya zvakare pane yakaderera tembiricha, iyo inogona kutamba yakanaka yekuparadzira inosimbisa mhedzisiro.
③Kuwedzera chromium kunonyanya kunatsiridza oxidation kuramba uye corrosion kuramba kwesimbi inodzivirira kupisa. Kana iyo chromium iri pasi pe5%, inotanga kuita oxidize nechisimba pa600 ℃, nepo chromium yemukati yasvika 5%, ine yakanaka oxidation kuramba. 12Cr1MoV simbi ine yakanaka oxidation resistance pazasi 580 ℃, uye kudzika kwecorrosion i 0.05 mm/A. pa600 ℃, kuita kunotanga kushata, uye kudzika kwecorrosion i0.13 mm/A. Iyo chromium yeT91 inogona kuwedzerwa kusvika munenge. 9% uye tembiricha yebasa inogona kusvika 650 ℃. Chiyero chikuru ndechekunyungudutsa yakawanda chromium mumatrix.
④Vanadium uye niobium yakasimba carbide kugadzira zvinhu. Mushure mekuwedzera, vanogona kuumba yakanaka uye yakagadzikana alloy carbides nekabhoni, iyo ine simba rakasimba rekuparadzira kusimbisa.
⑤ Molybdenum inonyanya kuwedzerwa kuvandudza simba rekupisa kwesimbi uye kutamba basa rekusimbisa mhinduro yakasimba.
Iyo yekupedzisira kupisa kurapwa kweT91 ndeye normalizing + yakanyanya kupisa kupisa. The normalizing tembiricha ndeye 1040 ℃, nguva yekubata haisi pasi pegumi maminetsi, tembiricha yekudziya i730 ~ 780 ℃, uye nguva yekubata haisi pasi pe1 h. Iyo microstructure mushure mekupedzisira kupisa kurapwa kunopisa martensite.
Kusimba kwesimbi yeT91 simbi pakushambidzika kwekamuri ≥ 585 MPa, goho simba pakushambidzika kwekamuri ≥ 415 MPa, kuoma ≤ 250 Hb, elongation (yakajairwa denderedzwa sampu ine 50 mm gauge kure) ≥ 20%, inobvumirwa kushushikana kukosha [ σ] 650 ℄ 30 MPa.
Zvinoenderana nekabhoni yakaenzana formula inokurudzirwa neInternational welding Society, iyo kabhoni yakaenzana neT91 ndiyo.
Zvinogona kuoneka kuti T91 ine urombo weldability.
T91 simbi ine tsika yakakura yekupisa inotonhora uye inononoka kutsemuka mune mamwe mamiriro. Naizvozvo, iyo welded yejoini inofanirwa kudzikiswa mukati meawa makumi maviri nemana mushure mekuputika. Iyo microstructure yeT91 mushure mekunama iplate uye strip martensite, iyo inogona kuchinjwa kuita tempered martensite mushure mekupisa, uye zvimiro zvayo zvakakwirira kune ndiro uye strip martensite. Kana tembiricha yekudziya yakadzikira, mhedzisiro yacho haisi pachena, uye iyo weld simbi iri nyore kuchembera uye kuputika; Kana tembiricha yekudziya yakanyanyisa (kupfuura AC1 mutsara), iyo joint inogona kuomeswa zvakare uye kuomeswa zvakare mukutonhodza kunotevera. Panguva imwecheteyo, sezvambotaurwa mupepa rino, pesvedzero yejoint softening layer inofanirwa kutariswa mukutemerwa tembiricha. Kazhinji kutaura, tembiricha yekudziya yeT91 ndeye 730 ~ 780 ℃.
Iyo yekudziya inogara ichipisa tembiricha yeT91 mushure mewelding haingaite isingasviki 1 h, kuitira kuti ive nechokwadi chekushandurwa kwakazara kwechimiro chayo kuita tempersite martensite.
Kuti uderedze kushushikana kwasara kweT91 simbi yakasungwa yakabatana, mwero wekutonhora unofanirwa kudzorwa pasi pe5 ℃ / min. Iyo welding process yeT91 simbi inogona kuratidzwa muFigure 3.
Preheat 200 ~ 250 ℃; ② Welding, interlayer tembiricha 200 ~ 300 ℃; ③ Kutonhodza mushure mekunama, nekumhanya kwe80 ~ 100 ℃ / h; ④ 100 ~ 150 ℃ kwe1 h; ⑤ Kupisa pa730 ~ 780 ℃ kwe1 h; ⑥ Kutonhorera pamwero usingapfuuri 5 ℃ / min.
T91 Steel inotsamira pamusimboti wealloying, kunyanya kuwedzera hushoma hwezvinhu zvekutevera zvakaita seniobium uye vanadium. Kusimba kwayo kwekushisa kwepamusoro uye oxidation kuramba yakavandudzwa zvakanyanya kana ichienzaniswa ne12 cr1mov simbi, asi kuita kwayo welding haina kunaka.
Muedzo wepini unoratidza kuti T91 simbi ine tsika yakakura yekutonhora kutsemuka. Kusarudza preheating 200 ~ 250 ℃ uye interlayer tembiricha 200 ~ 300 ℃ anogona zvinobudirira kudzivirira kutonhora mutswe.
T91 inofanira kutonhodzwa kusvika ku100 ~ 150 ℃ kwe1 awa isati yatanga weld kupisa kurapwa; Kupisa tembiricha 730 ~ 780 ℃, kubata nguva isiri pasi pe1 h.
Iyo iri pamusoro welding process yakashandiswa pakugadzira nekugadzira tsika ye200 MW uye 300 MW boilers, ine mhedzisiro inogutsa uye mabhenefiti makuru ehupfumi.
