Seamless steel kav yog nyob rau hauv Tshuag
Cov yeeb nkab steel tsis yog tsuas yog siv rau kev xa cov kua dej thiab cov hmoov av, sib pauv cov hluav taws xob hluav taws xob, tsim cov khoom siv kho tshuab thiab cov thawv ntim khoom, tab sis kuj yog kev lag luam hlau. Siv cov yeeb nkab steel los ua cov kab sib txuas hauv tsev, ncej thiab cov cuab yeej txhawb nqa tuaj yeem txo qhov hnyav, txuag hlau los ntawm 20 ~ 40%, thiab paub txog kev tsim kho thiab kev tsim kho tshuab. Kev tsim cov kav hlau loj nrog cov kav hlau tsis tuaj yeem tsuas yog txuag cov hlau thiab ua kom yooj yim rau kev tsim kho, tab sis kuj txo qis thaj tsam ntawm kev tiv thaiv txheej thiab txuag peev thiab kho cov nqi. Cov kav hlau tuaj yeem muab faib ua ob pawg raws li kev tsim khoom: seamless steel kav thiab welded steel kav. Welded steel kav yog hu ua welded kav rau luv luv.
1. Seamless steel yeeb nkab yuav muab faib ua kub dov seamless yeeb nkab, txias drawn yeeb nkab, precision steel yeeb nkab, kub expanded yeeb nkab, txias spinning yeeb nkab thiab extruded yeeb nkab raws li cov txheej txheem ntau lawm.
Seamless steel yeeb nkab yog ua los ntawm high-quality carbon steel los yog alloy steel, uas yuav muab faib ua kub dov thiab txias dov (kos duab).
2.Welded steel yeeb nkab tau muab faib ua rau hauv qhov cub hluav taws xob welded yeeb nkab, hluav taws xob vuam (ua haujlwm vuam) yeeb nkab thiab tsis siv neeg arc welded yeeb nkab vim muaj txheej txheem vuam sib txawv. Vim muaj cov ntaub ntawv sib txawv, nws tau muab faib ua ncaj seam welded yeeb nkab thiab kauv welded yeeb nkab. Vim nws qhov kawg zoo, nws tau muab faib ua voj voog welded yeeb nkab thiab tshwj xeeb-puab (square, ca, thiab lwm yam) welded yeeb nkab.
Welded steel yeeb nkab yog ua los ntawm dov steel phaj welded los ntawm pob tw pob tw los yog kauv seam. Nyob rau hauv cov nqe lus ntawm kev tsim txoj kev, nws kuj tau muab faib ua welded steel yeeb nkab rau cov dej tsis tshua muaj siab kis tau tus mob, muab kauv seam welded steel yeeb nkab, ncaj dov welded steel yeeb nkab, welded steel yeeb nkab, thiab lwm yam. Seamless steel yeeb nkab yuav siv tau rau cov kua thiab roj pipelines. nyob rau hauv ntau yam kev lag luam. Cov kav dej welded tuaj yeem siv rau cov kav dej, cov kav dej, cov kav dej cua sov, cov kav dej hluav taws xob, thiab lwm yam.
Cov cuab yeej cuab tam ntawm steel yog ib qho tseem ceeb Performance index los xyuas kom meej qhov kawg kev pab cuam (cov cuab yeej cuab tam) ntawm steel, uas nyob ntawm seb cov tshuaj muaj pes tsawg leeg thiab kev kho cua sov system ntawm steel. Nyob rau hauv cov txheej txheem steel yeeb nkab, raws li cov kev pabcuam sib txawv, cov khoom siv tensile (lub zog tensile, yield zog los yog yield point, elongation), hardness thiab toughness indexes, raws li zoo raws li lub siab thiab tsis kub khoom yuav tsum tau los ntawm cov neeg siv.
Qhov siab tshaj plaws quab yuam (FB) yug los ntawm cov qauv thaum lub sij hawm nro, muab faib los ntawm qhov qub hla ntu ntu (li) ntawm cov qauv (σ), hu ua tensile zog (σ b), hauv N / mm2 (MPA). Nws sawv cev rau lub peev xwm siab tshaj plaws ntawm cov ntaub ntawv hlau los tiv thaiv kev ua tsis tiav hauv qhov nro.
Rau cov khoom siv hlau nrog cov tshwm sim tawm los, qhov kev ntxhov siab thaum cov qauv tuaj yeem txuas ntxiv mus ntxiv yam tsis tau nce (ua kom tsis tu ncua) qhov kev ntxhov siab thaum lub sij hawm tensile txheej txheem hu ua qhov taw tes tawm. Yog tias qhov kev ntxhov siab txo qis, cov ntsiab lus sab saud thiab qis dua yuav tsum tau paub qhov txawv. Chav tsev ntawm qhov taw tes tawm yog n / mm2 (MPA).
Upper yield point (σ Su): qhov siab tshaj plaws kev ntxhov siab ua ntej qhov kev ntxhov siab ntawm cov qauv txo qis rau thawj zaug; Qis yield point (σ SL): qhov tsawg kawg nkaus kev nyuaj siab nyob rau hauv lub yield theem thaum pib instantaneous nyhuv yog tsis xam.
Cov qauv kev suav ntawm yield point yog:
Qhov twg: FS - yield stress (constant) ntawm tus qauv thaum lub sij hawm nro, n (Newton) yog li - thawj cross-sectional cheeb tsam ntawm tus qauv, mm2.
Hauv kev sim tensile, qhov feem pua ntawm qhov ntev tau nce los ntawm qhov ntsuas qhov ntev ntawm cov qauv tom qab tawg mus rau qhov ntsuas qhov ntev yog hu ua elongation. nrog σ nthuav tawm hauv%. Cov qauv kev suav yog: σ = (Lh-Lo) / L0 * 100%
Qhov twg: LH - ntsuas qhov ntev tom qab tus qauv tawg, hli; L0 - qhov ntsuas qhov ntev ntawm tus qauv, mm.
Hauv qhov kev sim tensile, qhov feem pua ntawm qhov siab tshaj plaws ntawm qhov txo qis ntawm qhov chaw hla ntawm qhov txo txoj kab uas hla thiab qhov chaw seem ntawm qhov qub tom qab cov qauv tawg yog hu ua qhov txo ntawm cheeb tsam. nrog ψ Qhia hauv%. Cov mis laij lej yog raws li nram no:
Qhov twg: S0 - thawj ntu ntu ntu ntawm cov qauv, mm2; S1 - qhov tsawg kawg nkaus ntu ntu ntawm qhov txo txoj kab uas hla tom qab tus qauv tawg, mm2.
Lub peev xwm ntawm cov ntaub ntawv hlau los tiv thaiv qhov indentation nto ntawm cov khoom tawv yog hu ua hardness. Raws li cov kev sim sib txawv thiab daim ntawv thov, qhov nyuaj tuaj yeem muab faib ua Brinell hardness, Rockwell hardness, Vickers hardness, shore hardness, microhardness thiab kub hardness. Brinell, Rockwell thiab Vickers hardness feem ntau yog siv rau cov kav dej.
Nias lub pob steel los yog cemented carbide pob nrog ib txoj kab uas hla mus rau hauv cov qauv saum npoo nrog lub zog ntsuas (f), tshem tawm qhov kev xeem quab yuam tom qab lub sijhawm tuav, thiab ntsuas qhov indentation txoj kab uas hla (L) ntawm tus qauv nto. Brinell hardness naj npawb yog cov quotient tau los ntawm kev faib cov kev xeem quab yuam los ntawm lub kheej kheej nto ntawm lub indentation. Qhia hauv HBS (steel ball), chav tsev: n / mm2 (MPA).
Qhov twg: F - ntsuas quab yuam nias rau saum npoo ntawm cov qauv hlau, N; D - txoj kab uas hla ntawm steel pob rau kev xeem, mm; D - nruab nrab txoj kab uas hla ntawm indentation, mm.
Kev txiav txim siab ntawm Brinell hardness yog qhov tseeb thiab txhim khu kev qha, tab sis feem ntau HBS tsuas yog siv tau rau cov khoom siv hlau hauv qab 450N / mm2 (MPA), tsis yog rau cov hlau tawv lossis nyias daim hlau. Brinell hardness yog feem ntau siv hauv cov qauv steel yeeb nkab. Indentation txoj kab uas hla D feem ntau yog siv los qhia qhov hardness ntawm cov khoom, uas yog intuitive thiab yooj yim.
Piv txwv li: 120hbs10 / 1000 / 30: nws txhais tau hais tias Brinell hardness tus nqi ntsuas los ntawm kev siv lub 10 hli txoj kab uas hla steel pob nyob rau hauv qhov kev txiav txim ntawm 1000kgf (9.807kn) xeem quab yuam rau 30s yog 120N / mm2 (MPA).
