350 qib steelyog hais txog ib qeb ntawm siab - lub zog steel structural txhais los ntawm nwsYam tsawg kawg nkaus yield zog ntawm 350 megapascals (MPa)rau cov qauv nyias nyias (feem ntau Tsawg dua lossis sib npaug li 20mm). Nws tsis yog ib qib nkaus xwb tab sis ib qho kev faib tawm siv thoob ntiaj teb cov qauv, suav nrog qis- alloy siab- lub zog (HSLA) steels haum rau kev thauj khoom- cov ntawv thov. Lub "350" nyob rau hauv nws lub npe ncaj qha qhia qhov tseem ceeb ntawm cov cuab yeej cuab tam - tawm dag zog lub zog- txhais tau tias cov hlau tuaj yeem tiv taus qhov tsawg kawg nkaus ntawm 350 MPa ntawm kev ntxhov siab ua ntej deformation mus tas li . 350 qib steel yog dav siv hauv kev tsim kho, tshuab, txuas hniav, thiab cov phiaj xwm kev tsim kho thoob ntiaj teb, nrog kev hloov pauv me ntsis ntawm cov qauv kev sib xyaw ua ke.
Tsis zoo li cov qib tshwj xeeb xws li Q355 lossis S355, "350 qib steel" yog qhov kev faib tawm dav dua nyob rau lub zog tawm los. Nws koom ua ke ntau yam qib steel hauv cheeb tsam uas qhia txog 350 MPa yam tsawg kawg nkaus cov txiaj ntsig muaj zog, ua rau nws yog ib qho tseem ceeb siv rau kev yuav khoom thoob ntiaj teb, tsim qhov project, thiab hloov khoom siv. Kev nkag siab 350 qib steel yuav tsum tau qhia meej txog nws cov ntsiab lus, cov qauv uas tswj hwm nws, nws cov khoom siv kho tshuab thiab tshuaj lom neeg, kev sib txawv, kev siv, thiab nws piv rau lwm cov qib steel qauv. Hauv qab no yog ib qho kev ua kom tiav los pab koj nkag siab tias qib 350 steel yog dab tsi thiab nws cov txiaj ntsig zoo hauv engineering.
1. Core txhais ntawm 350 Qib Steel
Ntawm nws cov tub ntxhais, 350 qib steel yog txhais los ntawm ib qho kev ntsuas tseem ceeb:Qhov tsawg kawg nkaus tawm lub zog ntawm 350 MParau standard thicknesses (feem ntau 8-20mm). Lub zog tawm los yog qhov kev ntxhov siab uas cov khoom hloov pauv los ntawm elastic (ntev) deformation mus rau yas (mus tas li) deformation - qhov taw qhia tseem ceeb rau cov qauv hlau, vim nws ua kom cov khoom thauj -cov kabmob tuaj yeem tiv taus cov qauv tsim yam tsis ua haujlwm.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias "350 qib" tsis yog khi rau ib qho qauv thoob ntiaj teb tab sis yog kev faib tawm thoob ntiaj teb. Ntau lub teb chaws thiab cheeb tsam muaj lawv tus kheej cov qib tshwj xeeb uas poob qis hauv qib 350 qib, txhua tus ua raws li cov qauv hauv zos thaum tswj hwm 350 MPa yield zog yuav tsum tau. Cov qhab nia no yuav muaj qhov sib txawv me ntsis ntawm cov tshuaj muaj pes tsawg leeg, cuam tshuam rau lub zog, thiab kev ua tau zoo, tab sis lawv txhua tus ua tau raws li cov ntsiab lus ntawm qib 350.
2. Cov qauv tseem ceeb hauv cheeb tsam & kev sib txawv ntawm 350 Qib Hlau
350 qib steel yog sawv cev los ntawm cov qib sib txawv thoob plaws ntiaj teb cov qauv tseem ceeb, txhua qhov tsim nyog rau cov kev xav tau hauv cheeb tsam engineering. Hauv qab no yog cov ntau yam sib txawv thiab lawv cov qauv kev tswj hwm:
2.1 Australian/New Zealand Standard (AS/NZS 3678)
Qhov zoo tshaj plaws -paub 350 qib steel variant yogAS/NZS 3678 Qib 350, qis- alloy siab- lub zog steel siv dav hauv Australia thiab New Zealand. Qib no ua tau raws li AS / NZS 3678-2011 tus qauv, nrog lub zog tawm los sib txawv me ntsis los ntawm tuab:
8-12mm thickness: Yam tsawg kawg nkaus yield zog Ntau dua los yog sib npaug rau 360 MPa
>12-20mm thickness: Yam tsawg kawg nkaus yield zog Ntau tshaj los yog sib npaug rau 350 MPa
>20-80mm thickness: Yam tsawg kawg nkaus yield zog Ntau dua los yog sib npaug rau 340 MPa
>80-200mm thickness: Yam tsawg kawg nkaus yield zog Ntau dua los yog sib npaug rau 330 MPa
AS / NZS 3678 Qib 350 muaj lub zog tensile ntau ntawm 450-590 MPa, elongation Ntau dua lossis sib npaug li 20%, thiab yog tsim los siv cov txheej txheem tswj dov thiab txias (TMCP) kom ua kom lub zog thiab tawv tawv. Nws kuj tseem muaj kev tswj hwm nruj ntawm cov ntsiab lus roj ((O) Tsawg dua lossis sib npaug li 30 ppm, (H) Tsawg dua lossis sib npaug li 2 ppm) thiab impurities kom zoo.
2.2 Indian Standard (IS 2062)
Hauv Is Nrias teb,IB 2062 E350yog thawj 350 qib steel variant. Qhov "E" qhia txog kev txwv elastic (yield zog), thiab "350" lees paub qhov tsawg kawg nkaus 350 MPa yield zog rau thicknesses tsawg dua los yog sib npaug rau 20mm. Nws yog qhov siab - tensile structural steel muaj nyob rau hauv subgrades (E350BR, E350B0, E350C) nrog rau qhov sib txawv ntawm qhov yuav tsum tau muaj zog:
E350BR: Raws li - dov, tsis muaj qhov yuav tsum tau kuaj xyuas
E350B0: Kev ntsuas cuam tshuam ntawm 0℃(yam tsawg kawg 27J)
E350C: Kev ntsuas cuam tshuam ntawm -20℃(yam tsawg kawg 27J)
IS 2062 E350 muaj lub zog tensile ntawm 490-630 MPa, elongation Ntau dua lossis sib npaug li 23%, thiab yog siv dav hauv Indian infrastructure thiab fabrication tej yaam num.
2.3 Lwm 350 Qib Variants
G350 Hlau: Lub siab - lub zog steel qauv (feem ntau galvanized) nrog qhov tsawg kawg nkaus lub zog ntawm 350 MPa, siv nyob rau hauv txias- cov seem, vov tsev, thiab cladding. Nws muaj cov formability zoo heev thiab weldability, nrog lub zog tensile ntau dua los yog sib npaug rau 430 MPa thiab elongation Ntau dua lossis sib npaug li 20%.
S350 hlau: Ib qho nruab nrab - carbon alloy structural steel raws li European qauv, nrog cov ntsiab lus carbon ntawm 0.25-0.35% thiab tensile lub zog haum rau load- cov ntaub ntawv bearing. Nws sib npaug lub zog thiab ductility, ua rau nws muaj ntau yam rau kev tsim kho thiab kev tsim khoom.
3. Core Mechanical & Chemical Properties ntawm 350 Qib Hlau
Thaum cov khoom tshwj xeeb sib txawv los ntawm tus qauv, tag nrho 350 qib steels qhia cov yam ntxwv tseem ceeb ntawm 350 MPa yield zog. Hauv qab no yog cov ntsiab lus dav dav ntawm lawv cov khoom tseem ceeb:
3.1 Mechanical Properties (Tus nqi zoo)
|
Khoom |
Ntau yam / Yam tsawg kawg nkaus |
Sau ntawv |
|---|---|---|
|
Yam tsawg kawg nkaus Yield Strength |
Ntau dua lossis sib npaug li 350 MPa (tsawg dua lossis sib npaug ntawm 20mm thickness) |
Txo me ntsis nrog nce thickness |
|
Tensile zog |
430-630 MPa |
Nws txawv ntawm tus qauv (piv txwv li, 450-590 MPa rau AS / NZS 3678 Qib 350) |
|
Elongation |
Ntau dua lossis sib npaug li 20-23% |
Xyuas kom zoo ductility rau kev sib sau thiab vuam |
|
Impact Toughness |
Ntau tshaj lossis sib npaug rau 27J (ntawm -20℃txog 20 degree) |
Nyob ntawm subgrade (piv txwv li, E350C rau qis- siv kub) |
|
Qhov ntom |
7.85 g / cm³ |
Raws li tus qauv structural steels |
3.2 Chemical Composition (Hom, Tsawg dua lossis sib npaug li %)
350 qib steels yog tsawg- alloy steels, nrog tshuaj muaj pes tsawg leeg optimized rau lub zog thiab weldability. Hauv qab no yog qhov dav dav (vim li tus qauv):
|
Element |
Ntau yam |
Ntsiab Function |
|---|---|---|
|
Cov pa roj carbon (C) |
0.20–0.25% |
Txhim khu lub zog; tswj kom tswj tau weldability |
|
Manganese (Mn) |
1.00–1.70% |
Txhim kho toughness thiab hardenability |
|
Silicon (Si) |
0.15–0.55% |
Pab deoxidation thaum steelmaking |
|
Phosphorus (P) |
Tsawg dua lossis sib npaug li 0.030–0.040% |
Tswj kom tsis txhob brittleness |
|
Sulfur (S) |
Tsawg dua lossis sib npaug li 0.025–0.040% |
Minimized los txhim kho ductility thiab weldability |
|
Microalloys (Nb/V) |
Tsawg dua lossis sib npaug li 0.15% |
Kho cov qauv nplej kom muaj zog zoo dua - sib npaug toughness |
Feem ntau 350 qib steels muaj cov pa roj carbon sib npaug (CEV) Tsawg dua lossis sib npaug li 0.48%, kom ntseeg tau qhov zoo tshaj plaws weldability-preheating feem ntau tsis tas yuav tsum muaj thicknesses tsawg dua lossis sib npaug li 35 hli ntawm qhov kub thiab txias ntau dua lossis sib npaug li 0℃.
4. Kev siv ntawm 350 Qib Steel
350 qib steel kev sib xyaw ua ke ntawm lub zog siab, ductility, thiab weldability ua rau nws zoo tagnrho rau kev thauj khoom -cov kabmob siv cov qauv hauv kev lag luam. Nws versatility spans regional tej yaam num, los ntawm Australian infrastructure mus rau Indian kev tsim kho. Cov ntawv thov uas muaj xws li:
Kev tsim kho: High-nce lub tsev kab thiab kab teeb, cov chaw tsim khoom lag luam, loj- ncua chaw ntau pob, thiab txias- ntu tsim (purlins, channels).
Cov choj: Txoj kev loj thiab txoj kev tsheb ciav hlau choj lub ntsiab girders, lawj daim hlau, thiab cov qauv kev txhawb nqa -leveraging nws lub zog yield zog rau ntev -span stability.
Machinery & Khoom hnyav: crane booms, mining machinery, hnyav- lub tsheb chassis, thiab cov khoom siv thav duab- tau txais txiaj ntsig los ntawm nws lub zog - rau - qhov hnyav piv.
Zog & Infrastructure: Cov hlab ntsha siab, cov tso tsheb hlau luam, cov chaw tsim hluav taws xob, thiab cov kav xa hluav taws xob - tso siab rau nws cov kav ntev thiab tawv.
Marine & Offshore: Offshore platform Cheebtsam thiab shipbuilding qhov chaw (rau corrosion{0}}tiv taus variants).
General Fabrication: Kev cai cov khoom siv, cov tsheb thauj khoom, thiab cov tsheb ciav hlau tsheb ciav hlau -vim nws yooj yim formability thiab weldability.
5. 350 Qib Steel vs. Zoo sib xws High- Qib Siab
350 qib steel feem ntau yog piv rau lwm cov qib siab - lub zog steels nrog cov txiaj ntsig zoo sib xws. Hauv qab no yog kev sib piv ceev kom qhia meej qhov sib txawv tseem ceeb:
|
Qib Steel |
Yam tsawg kawg nkaus tawm lub zog (MPa) |
Qhov txawv tseem ceeb |
Daim ntawv thov tseem ceeb |
|---|---|---|---|
|
Ntau dua lossis sib npaug rau 350 (tsawg dua lossis sib npaug li 20mm) |
Kev faib tawm dav; Nws txawv raws li cov qauv hauv cheeb tsam |
Kev tsim kho hauv cheeb tsam, machinery, infrastructure |
|
|
Ntau dua lossis sib npaug rau 355 (tsawg dua lossis sib npaug li 16 hli) |
Suav txheem; me ntsis siab dua yield zog |
Suav thiab Southeast Asian tej yaam num |
|
|
Ntau dua lossis sib npaug rau 355 (tsawg dua lossis sib npaug li 16 hli) |
European txheem; kev tswj xyuas nruj |
European thiab thoob ntiaj teb tej yaam num |
|
|
Ntau dua lossis sib npaug rau 345 |
American txuj; dav siv nyob rau hauv North America |
North American kev tsim kho thiab tshuab |
Lus Cim: 350 qib steel (piv txwv li, AS / NZS 3678 Qib 350) yog kwv yees li sib npaug rau Q355D thiab A572 Gr 50, nrog me ntsis sib txawv ntawm impurity tswj thiab txhua yam ntau yam.
Cov lus nug nquag nug (FAQ)
1. "350" txhais li cas hauv 350 qib steel?
"350" hauv 350 qib steel hais txog nwsYam tsawg kawg nkaus yield zog ntawm 350 megapascals (MPa)rau cov qauv nyias thicknesses (tsawg dua los yog sib npaug li 20mm). Qhov no txhais tau tias cov hlau tuaj yeem tiv taus 350 MPa ntawm kev ntxhov siab ua ntej deformation mus tas li.
2. Puas yog qib 350 steel yog ib qib tshwj xeeb?
Tsis muaj . 350 qib steel yog aKev faib tawm dav duaRaws li cov txiaj ntsig muaj zog, suav nrog ntau qib hauv cheeb tsam (xws li, AS / NZS 3678 Qib 350, IS 2062 E350, G350) uas txhua tus ua tau raws li 350 MPa yam tsawg kawg nkaus yield zog yuav tsum tau.
3. Qhov txawv ntawm 350 qib steel thiab Q355 steel yog dab tsi?
Q355 yog tus qauv Suav tshwj xeeb (GB / T 1591-2018) nrog qhov tsawg kawg nkaus tawm lub zog ntawm 355 MPa (tsawg dua lossis sib npaug li 16 hli), thaum 350 qib steel yog qhov dav dav (350 MPa yield zog). Qee qhov 350 qib sib txawv (xws li AS/NZS 3678 Qib 350) yog kwv yees sib npaug rau Q355D.
4. 350 qib steel puas tuaj yeem welded yooj yim?
Yog lawm. Feem ntau 350 qib steels muaj qhov sib npaug ntawm cov pa roj carbon tsawg (CEV Tsawg dua lossis sib npaug li 0.48%), kom ntseeg tau zoo weldability. Preheating tsis tas yuav tsum tau thicknesses tsawg dua los yog sib npaug rau 35 hli ntawm ambient kub Ntau tshaj los yog sib npaug rau 0 degree, simplifying fabrication.
5. Puas yog cov thickness cuam tshuam rau lub zog ntawm 350 qib steel?
Yog lawm. Qhov tsawg kawg nkaus yield zog txo me ntsis raws li thickness nce. Piv txwv li, AS / NZS 3678 Qib 350 muaj lub zog tawm los ntawm 360 MPa rau 8-12mm daim hlau, 350 MPa rau 12-20mm, thiab 340 MPa rau 20-80mm daim hlau.
6. Dab tsi yog cov subgrades ntawm 350 qib steel?
Subgrades sib txawv raws li tus qauv: IS 2062 E350 muaj E350BR (raws li -rolled), E350B0 (0℃cuam tshuam), thiab E350C (-20℃cuam tshuam); AS/NZS 3678 Qib 350 muaj thickness{13}}raws li subgrades; G350 muaj cov txheej txheem tshwj xeeb.
7. Puas yog qib 350 steel haum rau cov cheeb tsam txias?
Yog, yog xaiv qhov subgrade kom raug. Piv txwv li, IS 2062 E350C (kev ntsuam xyuas cuam tshuam ntawm -20 degree) thiab AS / NZS 3678 Qib 350 (nrog rau qhov tsim nyog toughness) yog tsim los rau qhov chaw txias, tiv thaiv kev tawg tawg.
8. Cov ntaub ntawv ntawm 350 qib steel muaj dab tsi?
350 qib steel muaj nyob rau hauv ntau yam ntaub ntawv, xws li daim hlau, coils, kub- dov seem (H- kab, kab), txias- seem tsim, seamless kav, thiab welded kav. Nws tuaj yeem ua tau galvanized rau txhim kho corrosion kuj.