Paunonzwa '2Cr13 Stainless simbi', iyo pfungwa yekukurumidza kune vakawanda ingori imwe yakakosha martensitic giredhi, yakanakira mapanga uye yakachipa mavharuvhu. Izvo hazvina kushata, asi kurerutsa kunotungamira kune akawanda shop pasi misoro kupfuura zvazvinofanira. Chokwadi ndechekuti, maitiro ayo anogara munzvimbo ino yepakati-haina kuregerera se304, kana kuomarara se440C. Kuwana mhedzisiro inowirirana nayo, kunyanya mukukanda uye kugadzira, inoda kuti iwe uremekedze ayo chaiwo quirks.
The Casting Conundrum: Fluidity vs. Cracking
Mune yedu shell mold uye mitsara yekukanda mari, 2Cr13 inogara ichibhururuka kune miviri yepombi, impellers, uye zvimwe zvikamu zvemuchina wechikafu. Yekutanga nuance iri kudurura tembiricha. Iwe ungafunga nekabhoni yayo ine mwero (~ 0.16-0.25%) uye 13% Cr, yakatwasuka. Asi huwandu hwayo hwekusimba hwakatetepa kupfuura zvaungatarisira. Dururira zvakanyanya kutonhorera, uye iwe unowana mistruns, kunyanya muzvikamu zvitete zvemapeller blade. Dururira kupisa zvakanyanya, uye njodzi yekupisa kubvarura spikes, kunyanya kutenderedza iwo akapinza makona emukati emuviri wevharuvhu. Takadzidza, kuburikidza neakakandwa mashoma akakandwa, kunanga kumagumo emhando yakakurudzirwa asi ine bhendi rakasimba rekudzora. Izvo ndezvekupa iyo fluidity yakakwana yekuzadza mold pasina kunyanya-kusimbisa goko rekusimbisa.
Zvadaro pane kupindirana kwezvinhu zvekuumbwa. Nekuti iri martensitic, inoshandura uye inodonha zvakasiyana pane austenitic mamakisi. Nekudyara kwekudyara tichishandisa magomba eceramic, taifanira kugadzirisa ganda rekutanga-kupisa tembiricha. Yakajairwa pre-kupisa ye304 yakakonzera kutsemuka mu2Cr13 castings nekuti kuvhunduka kwekushisa panguva yekudira kwakawedzera. Isu ikozvino pre-kupisa zvishoma kwakakwira, izvo zvinoita senge zvinopesana nekudzikisa kuderera kwekushushikana, asi zvakashanda. Yakaderedza kutonhora kwekutanga kwakangokwana kuita kuti ganda resimbi riumbe zvakanyanya kufanana.
Post-casting heat treatment is non-negotiable. As-cast 2Cr13 ine brittle. Unofanira kuibvisa. Iyo yakajairwa protocol kupisa kusvika ku850-900 ° C, kubata, uye kutonhora kwechoto. Asi heino zano rinoshanda: mwero wekutonhora muchoto zvine basa. Takambove nebhechi remapombi akakandwa akapfuura macheki ekuomarara asi akagadzirwa zvisina kunaka, achiratidza kupfeka kwakanyanyisa kwemidziyo. Nyaya yakadzokera kuchoto chakaremerwa zvakanyanya uko zvikamu zvepakati zvakatonhodzwa zvishoma nezvishoma, senge subcritical anneal, zvichisiya iyo microstructure isingaite. Iye zvino tinova nechokwadi chekuyera nzvimbo yekutakura. Ndiko kutsauka kwemaitiro aya madiki anokuruma iwe.
Machinability: The Gummy Reality
Pabepa, ayo machinability rating yakanaka. PaCNC pasi, vashandisi vanokuudza kuti inogona kunge iri gummy kana tambo, kunyanya mune annealed mamiriro. Iyo haipwanye machipisi zvakachena senge 12L14 simbi, uye haina kuchena-kucheka se303 isina tsvina. Chinokosha ndechekugadzirisa basa rakaoma. Kana chiyero chako chekudya chakadzikira kana chishandiso chikagara, iwe unobva washanda-kuomesa pamusoro, uye inotevera inopfuura inotaurirana kana kupisa chishandiso. Isu tinotsanangudza maturusi ecarbide ane yakapinza, yakakwenenzverwa reki kumeso uye tinoshandisa mafeed epamusoro nekumhanya kuri pakati nepakati. Kutonhodza kwakakosha, kwete kungotonhodza chete asi kubatsira kugeza machipisi aya akasimba.
Kuchera makomba akadzika idambudziko chairo. Iyo yakajairwa 118-degree point inogona kudzungaira uye kukonzera kupisa kwakanyanya. Takachinjira ku135-degree split-point drills ine inononoka pecking kutenderera uye yakawedzera inotonhorera kudzvanywa. Yakawedzera nguva yekutenderera asi yakabvisa yakawanda rework uye yakatyoka maturusi. Kune kambani yakadai Qingdao Qiangsenyuan Technology Co., Ltd. (QSY), iyo inobata zvese kubva pakukanda kusvika pakupedzisira CNC machining pasi pemba imwe chete, izvi zvidzidzo zvakabatanidzwa zvakakosha. Iwe haugone kukwidziridza machining uri wega; iwe unofanirwa kuzvidavirira kune iyo as-cast mamiriro uye kupisa kupisa nhoroondo yeisina chinhu. Chikamu chakange chakavharwa zvishoma-chinozorwa newe pa lathe zuva rese.
Ndinoyeuka chirongwa chenhevedzano ye hydraulic valve spools. Kudhinda kwacho kwaida kuti nyika ipere. Kutendeutsa 2Cr13 kusvika kumagumo kwaive kunetsa-takaramba tichiwana kubvaruka, kutsvetwa. Takaedza neakasiyana ekuisa geometri uye takazoona kuti wiper-style yekuisa ine yakareruka kwazvo yekupedzisa kupasa, tichishandisa chaiyo yakakwira-lubricity yekucheka fluid (kwete yedu yakajairwa inotonhorera), yakaita hunyengeri. Yakanga isiri mubhuku remaoko rekugadzira; chaive chigadziriso chepasi chechitoro chakazvarwa nekushungurudzika.
Corrosion Resistance: Kuisa Izvo Zvakakodzera Zvinotarisirwa
Apa ndipo pane pfungwa dzisiridzo dzevatengi dzakakura. Vanhu vanoona simbi isina tsvina vofunga kuti inodzivirira ngura. 2Cr13 simbi isina tsvina inopa chete pakati nepakati corrosion resistance. Yakanakira nzvimbo dzinotyisa zvishoma, senge mamwe maasidhi echikafu kana kuratidzwa kwemuchadenga, asi inodzika munzvimbo dzine chloride-rich settings (mvura yemunyu, heavy road salts). Isu tinogara tine hurukuro iyi nevatengi. Kune chikamu chemugungwa, isu taisundira 316L. Asi, toti, chikamu chemuchina wekubheka chakafumurwa mukanyiwa acids uye chiutsi, 2Cr13 inodhura-inoshanda uye yakakwana zvakakwana.
Passivation inobatsira, asi haisi chishamiso chekurapa. Maitiro emartensitic mamakisi seaya akasiyana neiyo nitric acid yekugezera inoshandiswa kune austenitics. Isu tinoshandisa citric acid-based passivation process, inoshanda uye inoshamwaridzana nenharaunda. Zvisinei, kubudirira kwayo kunoenderana zvachose pamusoro pechiso chakachena zvakakwana pamberi pekugeza. Chero simbi yakamisikidzwa kubva mukugadzira kana kubata inokanganisa iyo passive layer. Takaita danho rekuchenesa nekuongorora zvakasimba tisati tapedza, izvo zvakaderedza zvakanyanya kunyunyuta kwemarara pazvikamu zvakapedzwa.
Iyo yekupisa kurapwa mamiriro inobata zvakananga kuita ngura. Chikamu chine hasha chichava nekudzivisa zviri nani pane iyo inongopedza kushushikana. Isu takanyora izvi nekuyedza samples kubva kumabheji akasiyana mune kabati yekupfapfaidza munyu. Iyo data yakatibatsira kururamisa yedu yakazara kupisa kurapwa protocol kune vatengi vaiyedza kukoshesa-injiniya iyo nhanho yekubuda. Kusvetuka mushonga wekupisa wakakodzera kuchengetedza mutengo kunowanzo dzosera mushure nekutadza kwe-mu-sevhisi.
Welding uye Kugadzirwa: Ramba Nekuchenjerera
Inogoneka, asi haina hushamwari. Pre-heat inorayirwa zvakasimba, inenge 200-300 ° C, uye post-weld heat treatment (PWHT) inenge nguva dzose inofanirwa kudzoreredza ductility uye kudzivisa kuparara munzvimbo inopisa-yakakanganiswa (HAZ). Kana ukasvetuka PWHT, HAZ inobva yaoma, kuita brittle, uye kuita nyore kutsemuka. Isu takadzidza izvi nekukurumidza pakugadzirisa makanda akatsemuka. Kugadzirisa weld isina pre-heat uye PWHT kazhinji inongotsemuka zvakare mamirimita mashoma kubva kune weld bead.
Nekugadzira zvivakwa zvakashongedzwa kubva mundiro kana bar, kusarudzwa kwesimbi yekuzadza kwakakosha. Sarudzo dzakajairika i309L kana 312 Stainless maelectrodes, ane alloy yakakwira zvemukati kutsiva dilution uye kudzivirira kuomesa zvakanyanya. Kunyange zvakadaro, kudzora tembiricha yeinterpass yakakosha. Isu tinoibata zvakanyanya sewelding simbi yakaderera-alloy pane simbi isina tsvina. Kuchinja kwepfungwa kwakakosha.
Kuedza kumwe kwakakundikana kwaisanganisira mutengi aida gungano rakasungirirwa remapuleti e2Cr13 uye zvekukandira. Ivo vakasimbirira kuti hapana PWHT nekuda kwekunetseka kwekugadzikana. Takayambira pamusoro pazvo asi takaenderera sechikumbiro chavo. Zvikamu zvakapfuura kuongororwa kwekutanga asi zvakatsemuka mukufamba munguva yechando. Izvo zvakasara zvinonetsa kubva kune welding, zvakasanganiswa nekudzika-kupisa embrittlement ye untempered martensite muHAZ, yakakonzera. Isu ikozvino tinoda kuregera kwakasainwa kana mutengi akaramba akakurudzirwa PWHT. Hazvina kukodzera kukuvadza mukurumbira.
Sourcing uye Material Consistency: Iyo Yakavanzika Variable
Haasi ese 2Cr13 akagadzirwa akaenzana. Musiyano mukutsvaga zvinhu sesarufa, phosphorus, uye silicon pakati pezvigayo zvakasiyana zvinogona kukanganisa zvakanyanya kukanda uye machinability. Isu takamisa cheni yedu yekugovera zvakanyanya sezvinobvira uye tinokumbira mill test report yemabasa akakosha. Batch ine sulfuri pamucheto wepamusoro weiyo spec inogona kuita zvirinani asi inogona kunge iri nyore kubvarura kupisa panguva yekukanda.
Kushanda nemudiwa wenguva refu se QSY, nemakumi emakore mukati Investment casting uye machining, inoratidza kukosha kwekutonga uku. Isu tinokwanisa kuteedzera machining nyaya kumashure kune chaiyo kupisa kwesimbi uye kugadzirisa edu ekumusoro maparamita zvinoenderana. Semuyenzaniso, kana batch idzva richinzwa kuomarara pane yekutanga maturusi kubata, isu tichatarisa iyo chaiyo kabhoni yemukati pane cert uye tinogona kugadzirisa annealing tembiricha tisati tambotanga kugadzira kuzere. Iyi proactive nzira inochengetedza matani ekuderera.
Pakupedzisira, ndezvekuziva nguva yekusaishandisa. Nekusimuka kwe special alloys senge super duplex kana nickel-yakavakirwa nharaunda dzakanyanyisa, basa re2Cr13 isarudzo yakavimbika, ine hupfumi kune chaiyo, inonzwisiswa zvikumbiro. Ibhiza rebasa, kwete bhiza rekuratidzira. Kukosha kwayo kuri mukuita kwayo kunofungidzirwa mukati memiganhu yayo, uye hunyanzvi chaihwo huri mukutsanangura nekuremekedza miganhu iyoyo kuburikidza nenhanho imwe neimwe-kubva muchoto chekuwana kusvika kune chekupedzisira QC cheki. Ndipo panotaura makore makumi matatu echiitiko pafemu yakaita seyedu.
