COV QIB NTAWM COV HLAU KUB ROLLED

Cov hlau kub dov yog ib qho ntawm cov khoom siv dav tshaj plaws hauv kev tsim khoom, kev tsim kho, tsheb, thiab cov tshuab hnyav. Paub txog nws qhov kev hloov pauv tau yooj yim, kev siv nyiaj tsawg, thiab yooj yim tsim, cov hlau kub dov muaj ntau qib, txhua qib tsim rau cov khoom siv kho tshuab thiab kev ua haujlwm tshwj xeeb.

Nkag siab txogcov qib ntawm cov hlau kub dovpab cov engineers, cov neeg tsim khoom, thiab cov kws tshwj xeeb xaiv cov khoom siv zoo rau lawv cov haujlwm. Cov qib sib txawv sib txawv hauv lub zog, ductility, toughness, weldability, thiab corrosion resistance. Hauv tsab xov xwm no, peb yuav tshawb nrhiav cov pawg tseem ceeb thiab qib ntawm cov hlau kub dov, lawv cov khoom, thiab cov ntawv thov feem ntau.

Cov Hlau Kub Yog Dab Tsi?

Cov hlau kub dov yog tsim los ntawm kev ua kom cov hlau slabs sov dua li lawv qhov kub recrystallization, feem ntau yog li ntawm 900 ° C txog 1100 ° C, thiab tom qab ntawd dov lawv mus rau hauv cov duab xav tau. Vim tias cov hlau raug dov ntawm qhov kub siab, nws yooj yim dua rau kev ua thiab tsim, ua rau nws zoo tagnrho rau cov khoom loj thiab cov ntawv thov uas qhov kev kam rau siab tsis tseem ceeb.

Tom qab dov, cov hlau raug txias hauv huab cua, uas yuav ua rau muaj qhov sib txawv me ntsis hauv qhov loj me tab sis muab cov khoom siv nws cov qauv ntxhib.

Cov Khoom Tseem Ceeb ntawm Cov Hlau Kub Dov

1. Kev Ua Zoo- Yooj yim rau cov duab thiab khoov thaum lub sijhawm tsim khoom.

2. Kev Ruaj Siab Siab- Muaj peev xwm tiv taus cov khoom hnyav thiab kev cuam tshuam.

3. Kev Tsim Khoom Uas Pheej Yig- Kev ua tiav tsawg dua piv rau cov hlau txias.

4. Kev siv tau ntau yam- Haum rau ntau yam lag luam.

5. Kev Hloov Pauv ntawm Qhov Loj- Kev kam rau siab tsis nruj npaum li cov hlau txias dov, tab sis lees txais rau ntau daim ntawv thov.

Cov Pawg Tseem Ceeb ntawm Cov Qib Hlau Kub Dov

Cov qib hlau kub dov feem ntau tuaj yeem muab faib ua plaub pawg loj:

1. Cov Qib Carbon Steel

2. Cov Qib Hlau Alloy

3. Cov Qib Hlau Muaj Zog Siab Low-Alloy (HSLA)

4. Cov Qib Tshwj Xeeb rau Cov Ntawv Thov Tshwj Xeeb

1. Cov Qib Carbon Steel

Cov hlau carbon yog cov hlau kub dov feem ntau, txhais los ntawm lawv cov ntsiab lus carbon.

Cov Hlau Carbon Tsawg (Cov Hlau Me Me)

• Cov ntsiab lus carbon– Txog li 0.25%

• Piv txwv- ASTM A36, S235JR

• Cov Khoom- Zoo heev weldability, zoo ductility, pheej yig.

• Cov ntawv thov- Cov nqaj hlau, kev tsim khoom dav dav, kev ua haujlwm hlau.

Hlau Carbon Nruab Nrab

• Cov ntsiab lus carbon– 0.25% txog 0.60%

• Piv txwv– C45, SAE 1045

• Cov Khoom- Muaj zog thiab tawv dua li cov hlau tsis muaj zog, muaj zog nruab nrab.

• Cov ntawv thov– Cov qag, cov iav, cov qag, cov khoom siv tshuab.

Cov Hlau Carbon Siab

• Cov ntsiab lus carbon– 0.60% txog 1.00%

• Piv txwv– SAE 1095

• Cov Khoom- Kev nyuaj siab heev, qis dua ductility, hnav-resistant.

• Cov ntawv thov- Cov Springs, cov cuab yeej txiav, cov xov hlau muaj zog heev.

2. Cov Qib Hlau Alloy

Cov hlau sib xyaw muaj cov ntsiab lus ntxiv xws li chromium, molybdenum, nickel, lossis vanadium los txhim kho cov khoom.

• 4140 Hlau– Cov hlau sib xyaw Chromium-molybdenum uas muaj lub zog siab, tawv, thiab tiv taus kev hnav. Feem ntau siv rau hauv kev lag luam tsheb, roj, thiab roj av.

• 4340 Hlau- Nickel-chromium-molybdenum alloy steel uas paub txog lub zog siab thiab tiv taus kev nkees.

• 8620 Hlau– Cov hlau nickel-chromium-molybdenum siv rau cov khoom carburized uas xav tau lub plawv tawv thiab qhov chaw tawv.

3. Cov Qib Hlau Uas Muaj Zog Siab Low-Alloy (HSLA)

Cov hlau HSLA yog tsim los muab cov khoom siv kho tshuab zoo dua thiab tiv taus xeb ntau dua li cov hlau carbon, yam tsis muaj qhov hnyav nce ntxiv.

• A572 Hlau- Cov hlau ua vaj tse muaj zog heev siv rau hauv cov choj, cov tsev, thiab cov khoom siv hauv kev tsim kho.

• A588 Hlau (Hlau Tiv Thaiv Huab Cua)- Muaj tooj liab thiab lwm yam khoom sib xyaw ua ke rau kev tiv thaiv corrosion zoo dua; siv rau hauv cov qauv sab nraum zoov yam tsis tau pleev xim.

• S355MC- Cov hlau muaj zog siv rau hauv cov thav duab tsheb thiab chassis.

4. Cov Qib Tshwj Xeeb rau Cov Ntawv Thov Tshwj Xeeb

Qee cov qib hlau kub dov tau tsim los rau cov kev xav tau tshwj xeeb:

• AR400 / AR500- Cov hlau uas tiv taus kev sib txhuam siv rau hauv cov khoom siv khawb av thiab cov tshuab hnyav.

• Cov Hlau Ua Nkoj (AH36, DH36)- Cov hlau muaj zog heev rau kev siv hauv dej hiav txwv thiab ntug dej hiav txwv.

• Cov Hlau Rau Lub Taub Hau Siab (A516 Qib 70)- Tsim los rau cov boilers thiab cov hlab ntsha siab.

• Cov Hlau Rail- Cov qib tshwj xeeb rau kev tiv taus kev hnav thiab kev tawv hauv txoj kev tsheb ciav hlau.

Cov Txheej Txheem Thoob Ntiaj Teb rau Cov Hlau Kub Dov

Cov teb chaws sib txawv siv lawv cov txheej txheem kev faib tawm thiab cov qauv rau cov hlau kub dov:

• ASTM (Lub Koom Haum Asmeskas rau Kev Ntsuas thiab Cov Khoom Siv)– Feem ntau nyob rau hauv Tebchaws Meskas, piv txwv li, ASTM A36, ASTM A572.

• EN (Tus Qauv European)- Cov qauv European xws li EN 10025-2 (S235, S355).

• JIS (Cov Qauv Kev Lag Luam Nyiv)– Piv txwv li suav nrog SS400 thiab SM490.

• GB (Cov Qauv Hauv Tebchaws Suav)– Q235, Q345.

• Cov Qauv ISO- Cov txheej txheem sib haum xeeb thoob ntiaj teb.

Xaiv Qib Zoo ntawm Cov Hlau Kub Dov

Thaum xaiv qib hlau kub dov, xav txog:

1. Cov Kev Xav Tau Txog Lub Zog Kho Tshuab- Xaiv qib uas muaj lub zog tensile thiab yield tsim nyog.

2. Kev vuam tau- Cov qib carbon qis muab kev vuam zoo dua.

3. Kev Tiv Thaiv Kev Xeb- Cov hlau uas tiv taus huab cua los yog cov hlau sib xyaw rau cov chaw ib puag ncig hnyav.

4. Kev ua tau zoo- Cov hlau tsis muaj zog yooj yim khoov thiab ua kom zoo nkauj.

5. Tus nqi thiab qhov muaj- Qee qib muaj ntau dua nyob rau hauv qee lub khw.

Kub dov vs. Txias dov hlau