GOST 550 Steel 20 Seamless Yeeb Nkab yog dab tsi
Seamless yeeb nkab ua los ntawm Steel 20 yog ib qho ntawm cov qauv dawb carbon raj khoom siv nyob rau hauv Lavxias teb sab thiab CIS xyaum rau chav, dej, roj thiab kev pab cuam engineering. Hlau 20 yog cov ntsiab lus ntawm cov khoom siv: nws yog cov hlau tsis tshua muaj cov qauv hlau uas nws cov tshuaj lom neeg muaj pes tsawg leeg thiab cov khoom siv kho tshuab tau teeb tsa hauv GOST 1050, thiab nws yog qib tiv thaiv cov yeeb nkab lub zog thiab cov ductility.
Txoj kev tsim khoom yog tib txoj kev seamless siv rau cov pa roj carbon steel nyob txhua qhov chaw: cov khoom siv hluav taws xob tau hloov mus rau hauv lub plhaub hollow los ntawm kev tho, lub plhaub yog elongated thiab loj, thiab cov raj tiav yog kho cua sov, ncaj thiab sim. Qhov txawv ntawm Steel 20 kev txiav txim yog cov khoom tswj ntawm txhua kauj ruam, vim tias qib qis carbon thiab cov ntsiab lus tsis tshua muaj alloy muab nws zoo formability thiab weldability tab sis tawm hauv cov txheej txheem tsis nqa tag nrho lub nra ntawm kev ua tiav qhov yuav tsum tau muaj qhov tseeb thiab qhov zoo ntawm qhov chaw.
Cov Khoom Siv: Hlau 20 rau GOST 1050
Steel 20 yog ib qho khoom siv hlau tsis sib xws nrog cov ntsiab lus ntawm cov pa roj carbon monoxide ntawm ib feem tsib ntawm ib feem pua, uas yog vim li cas nws tau teev los ntawm tus lej ntau dua li ntawm chav kawm muaj zog. Cov qib carbon maj mam ua kom cov hlau ductile thiab weldable thaum silicon thiab manganese muab lub zog thiab deoxidation.
| Element | Feem ntau mus rau GOST 1050 |
|---|---|
| Cov pa roj carbon | 0.17 rau 0.24 feem pua |
| Silicon | 0.17 rau 0.37 feem pua |
| Manganese | 0.35 rau 0.65 feem pua |
| Phosphorus | 0.030% siab tshaj |
| Sulfur | 0.035% siab tshaj |
| Chromium, npib tsib xee thiab tooj liab | Residual txwv kho los ntawm tus qauv |
| Khoom | Yam yuav tsum tau ua rau GOST 1050 |
|---|---|
| Tensile zog | 410 MPa yam tsawg kawg nkaus |
| Yield zog | 245 MPa yam tsawg kawg nkaus |
| Elongation | 25 feem pua yam tsawg kawg nkaus |
Vim tias qib yog ductile thiab weldable, nws yog siv rau cov kav dej thiab dej kub, boiler thiab cua kub exchanger tubes nyob rau hauv qis thiab nruab nrab siab kev pab cuam, roj thiab dej kab, thiab dav siv txhua yam tubing. Qhov yuav tsum tau ua rau lub raj tiav ua raws li GOST seamless raj qauv rau cov khoom kub deformed thiab txias deformed.
Txoj Kev Kub Kub: Cua sov, tho thiab dov
Cov txheej txheem pib nrog kev xaiv ntawm steel billets los yog ingots ntawm cov qib uas yog, uas yog txiav mus rau qhov yuav tsum tau qhov hnyav thiab tshuaj xyuas qhov chaw defects. Lub billet yog ces rhuab nyob rau hauv ib tug reheat rauv mus rau qhov kub thiab txias qhov twg cov hlau yuav forgeable. Cov cua sov yuav tsum tsis tu ncua los ntawm ntu thiab lub sij hawm soaking yuav tsum ntev txaus kom sib npaug ntawm qhov kub thiab txias, vim hais tias ib tug txias tub ntxhais yuav tsis tho huv si thiab ib tug burnt nto yuav tsis yob tawm.
Thaum lub billet tau mus txog qhov yuav tsum tau kub nws yog pierced. Ib tug tho zeb quab yuam ib tug mandrel los ntawm qhov chaw ntawm lub rhuab steel, qhib lub hollow plhaub thiab ib txhij elongating nws. Lub plhaub pierced ces elongated thiab tsim los ntawm kub dov, siv lub ntsaws zeb, mandrel zeb los yog Assel los yog Diescher hom zeb nyob ntawm seb qhov luaj li cas thiab cov phab ntsa thickness. Thaum lub sij hawm dov sab nraud txoj kab uas hla yog txo, phab ntsa thickness yog coj mus rau qhov yuav tsum tau tus nqi thiab qhov ntev yog nce. Rolling kuj refines lub grain qauv thiab txhim kho cov neeg kho tshuab zog ntawm cov hlau.
Tom qab dov, lub raj yog reheated los yog tuav rau sizing, dhau los ntawm ib tug sizing thiab txo zeb kom coj txoj kab uas hla nyob rau hauv lub siab ntev, txias rau ib tug txias txaj, straightened thiab txiav kom ntev. Txhua yam ntawm cov kauj ruam no tawm ntawm nws tus kheej lub cim rau ntawm cov khoom tiav: sizing tswj txoj kab uas hla, straightening tswj hneev nti, thiab kev ua kom txias ua rau lub microstructure zaum kawg.
Txoj Kev Txias: Kos duab, Annealing thiab Finishing
Kev kos duab txias yog siv qhov kev ua kom nruj dua, yuav tsum muaj phab ntsa nyias nyias lossis ua kom tiav qhov zoo tshaj plaws. Lub plhaub kub los yog lub raj yog thawj zaug tshem tawm cov nplais oxide, tom qab ntawd coated nrog cov roj nplua nyeem kom cov roj nplaum yuav ua raws. Cov raj npaj tau muab rub los ntawm qhov tuag thiab dhau ntawm lub mandrel ntawm chav tsev kub, uas txo ob txoj kab uas hla thiab cov phab ntsa tuab thiab txhim kho qhov ua tiav ntawm qhov kawg thiab qhov tseeb qhov tseeb.
Vim hais tias txias ua hauj lwm hardens cov hlau, lub raj yuav tsum tau annealed ntawm daim duab passes. Tus naj npawb ntawm kev hla, qhov kev txo qis ntawm ib qho dhau los thiab lub sijhawm annealing raug xaiv kom ncav cuag qhov loj me yam tsis muaj ntau tshaj qhov ductility ntawm cov khoom. Tom qab qhov kawg hla lub raj yog straightened, txiav, thiab qhov tsim nyog muab ib tug kawg ci annealed los yog pickled tiav. Cold drawn tube yog ib txwm muab nrog qhov ntev ntev ntev dua li cov khoom kub tiav, uas yog vim li cas nws thiaj li nyiam rau cov cua kub exchanger raj, ntsuas kab thiab precision mechanical applications.
Kev kho cua sov, kuaj thiab tso tawm
Cov theem kawg ntawm kev tsim khoom yog kev kho cua sov. Normalising, quenching thiab tempering yog siv los ua kom tau raws li qhov yuav tsum tau muaj lub zog, hardness thiab ductility, thiab cov tswv yim tshwj xeeb yog nyob ntawm qhov kev npaj siv cov yeeb nkab thiab cov kev xav tau ntawm kev yuav khoom. Rau cov pa roj carbon steel 20 lub raj, normalizing yog qhov kev kho mob ib txwm muaj, vim tias nws ua rau cov qauv ferrite thiab pearlite zoo ib yam nrog cov khoom siv tau zoo thiab txo cov kev ntxhov siab sab laug los ntawm dov lossis kos duab.
Kev tswj hwm zoo khiav los ntawm tag nrho txoj kev es tsis zaum ntawm qhov kawg ntawm nws. Nws suav nrog kev txheeb xyuas tshuaj lom neeg ntawm cov cua sov, qhov ntsuas qhov ntev ntawm txoj kab uas hla thiab phab ntsa tuab, kev tshuaj xyuas qhov pom ntawm qhov chaw sab hauv thiab sab nraud, thiab tsis yog - kuaj kev puas tsuaj xws li ultrasonic lossis eddy kev kuaj tam sim no txhawm rau txheeb xyuas qhov tsis xws luag. Kev ntsuam xyuas hydrostatic siab lees paub qhov siab ncaj ncees, thiab kev ntsuas kev ntsuas ntawm cov khoom siv los ntawm cov raj tiav ua pov thawj lub zog tensile, tawm lub zog thiab elongation tiv thaiv qib yuav tsum tau ua. Tsuas yog tom qab cov tshev no ua tiav yog lub raj txiav mus rau qhov kawg ntev, cim nrog tus naj npawb cua sov thiab tso tawm.
FAQ
Q: Steel 20 yog dab tsi?
Steel 20 yog ib qho yooj yim carbon structural steel qib tau teev tseg los ntawm GOST 1050, nrog cov ntsiab lus carbon ntawm kwv yees li 0.17 txog 0.24 feem pua thiab qhov tsawg kawg nkaus ntawm 410 MPa tensile lub zog thiab 245 MPa yield zog.
Q: Vim li cas lub billet rhuab ua ntej tho?
Cua sov ua rau cov hlau forgeable kom cov tho qhov mandrel tuaj yeem qhib lub plhaub huv si. Kev sib koom ua ke los ntawm cov cua sov yog qhov tseem ceeb, vim hais tias cov tub ntxhais txias ua rau muaj qhov tsis xws luag thiab qhov chaw overheated yuav tsis yob tawm kom zoo.
Q: Qhov txawv ntawm kub dov thiab txias drawn raj yog dab tsi?
Kub dov daim duab lub raj ntawm qhov kub thiab txias yog kev lag luam rau qhov ntau thiab tsawg thiab kam rau ua. Kev kos duab txias rub lub raj los ntawm qhov tuag ntawm chav tsev kub kom ua tiav qhov kev ua siab ntev dua, cov phab ntsa nyias nyias thiab ua kom tiav qhov zoo dua.
Q: Vim li cas annealing xav tau ntawm kev kos duab txias?
Txias ua hauj lwm hardens cov hlau thiab txo nws cov ductility. Annealing restores lub ductility kom txo tau ntxiv yog ua tau yam tsis muaj cracking lub raj.
Q: Kev kho cua sov dab tsi feem ntau siv rau Steel 20 raj?
Normalizing yog kev kho mob ib txwm. Nws tsim cov qauv zoo li ferrite thiab pearlite, muab lub zog ua kom pom tseeb thiab ductility, thiab txo cov kev ntxhov siab sab hauv uas qhia los ntawm dov lossis kos duab.
Q: Yuav ua li cas kuaj ua ntej lub raj tso tawm?
Kev tshuaj xyuas cov cua sov, qhov ntsuas qhov ntsuas ntawm txoj kab uas hla thiab phab ntsa tuab, kev kuaj pom ntawm qhov chaw, ntsuas ultrasonic lossis eddy tam sim no, kev ntsuas hydrostatic siab thiab kev ntsuas txhua yam rau lub zog tensile, yield zog thiab elongation.
