Q235A yog qib Suav steel uas yog nyob rau hauv qeb ntawm carbon structural steel. Lub "Q" hauv Q235A sawv cev rau "yield", thiab tus lej 235 sawv cev rau lub zog ntawm cov khoom siv, uas yog 235Mpa. Qhov "A" hauv Q235A qhia tias cov hlau muaj cov ntsiab lus qis dua thiab cov khoom siv tsis zoo rau Q235B.
Q235B yog lwm qib steel hauv Q235 tsev neeg uas txawv ntawm Q235A hauv cov khoom siv kho tshuab thiab tshuaj lom neeg muaj pes tsawg leeg. Q235B feem ntau suav hais tias yog qhov kev xaiv muaj zog thiab ntau yam ntau dua li Q235A.
Qhov sib txawv tseem ceeb ntawm Q235A thiab Q235B steel daim hlau yog tias Q235B yuav tsum muaj qhov yuav tsum tau kuaj xyuas ntawm 20℃(chav temp) rau qhov tawv, uas Q235A tsis xav tau, ua rau kom qis dua - kub ua haujlwm rau qib B, nrog rau kev txwv me ntsis ntawm carbon (0.2% vs 0.04% sulfur) (0.2% thiab 0.22% sulfur) 0.05% max), ua Q235B ntau dua - zoo, tawv hlau rau kev thov.
Tshuaj muaj pes tsawg leeg:
|
Qib |
C % |
Si% |
Mn% |
P % |
S % |
|
Q235A |
Tsawg dua lossis sib npaug li 0.22 |
Tsawg dua los yog sib npaug li 0.35 |
Tsawg dua los yog sib npaug rau 1.4 |
Tsawg dua lossis sib npaug li 0.045 |
Tsawg dua lossis sib npaug li 0.050 |
|
Q235B |
Tsawg dua los yog sib npaug li 0.20 |
Tsawg dua los yog sib npaug li 0.35 |
Tsawg dua los yog sib npaug rau 1.4 |
Tsawg dua lossis sib npaug li 0.045 |
Tsawg dua lossis sib npaug li 0.045 |
Mechanical Properties:
| Khoom | Q235A (tus qauv) | Q235B (tus qauv) |
|---|---|---|
| Yield zog (nominal) | 235 MPa (tsim lub hauv paus rau qib npe) | 235 MPa rau |
| Tensile zog (tseem ceeb) | ~ 370-500 MPa (nyob ntawm thickness / txheej txheem) | ~ 370-500 MPa (qhov sib xws) |
| Elongation (A%) | ~ 20-26% (nws txawv nrog tuab) | ~ 20-26% (zoo ib yam lossis zoo dua me ntsis ntawm qhov kub thiab txias) |
| Impact toughness | Tsis tau teev los ntawm tus qauv rau A; nws txawv ntawm zeb | Qhia meej ntawm 0℃(feem ntau Charpy V-notch yam tsawg kawg nkaus, piv txwv li, ~ 27 J) |
| Hardness | Yam me me- steel hardness range; tsis yog thawj spec | Zoo ib yam li Q235A raws li kev ua haujlwm |
Q235B steel ua tau zoo dua hauv cov khoom siv kho tshuab, ua tsaug rau cov kev cai nruj ntawm nws chav ntsuas qhov kub thiab txias (V-notch). Hauv qhov sib piv, cov khoom siv hluav taws xob ntawm Q235A steel yog me ntsis qis dua. Tsis tas li ntawd, muaj qhov sib txawv ntawm qhov kev ntsuam xyuas rau cov qib sib txawv ntawm Q235 steel. Piv txwv li, Q235C thiab Q235D steels yuav tsum raug kuaj xyuas ntawm qhov kub thiab txias thiab ua tau raws li qhov yuav tsum tau muaj zog. Cov kev sib txawv no yog qhov tseem ceeb rau kev ntsuas kev ua tau zoo ntawm cov hlau hauv kev siv tswv yim.
Qhov chaw thov:
Q235A steel feem ntau yog siv rau hauv kub- dov lub xeev, thiab nws cov dov steel seem, steel tuav, steel phaj thiab steel kav yog dav siv nyob rau hauv kev tsim khoom ntawm ntau yam welded structural qhov chaw, txuas hniav thiab lub tshuab zoo tib yam, xws li bolts, khi rods, rivets, dab tshos thiab txuas rods.
Q235B kauv steel kav yog siv dav, npog cov dej, roj, roj thiab kev tsim kho hauv nroog.
Weldability thiab Formability:
Vim muaj cov ntsiab lus sib txawv ntawm cov pa roj carbon monoxide, Q235A feem ntau yooj yim rau vuam thiab tsim dua Q235B. Kev elongation siab dua ua rau Q235A tsis tshua tawg lossis tawg thaum khoov thiab ncab.
Txawm li cas los xij, Q235B lub zog tensile ntau dua ua rau nws tiv taus ntau dua rau kev deformation hauv qab thauj khoom, yog li Q235B muaj qhov zoo dua Q235A hauv kev siv cov qauv.
Corrosion Resistance:
Thaum ob qho tib si Q235A thiab Q235B muaj kev tiv thaiv corrosion zoo sib xws, Q235B yog me ntsis resistant rau atmospheric corrosion tshaj Q235A vim nws cov ntsiab lus ntau dua manganese. Manganese pab txhim kho corrosion kuj ntawm cov hlau, yog li Q235B yuav ua tau ntev dua nyob rau hauv ib co hnyav ib puag ncig daim ntaub ntawv.
Hauv Cov Ntsiab Lus Yooj Yim
Xav txog nws zoo li no: Q235A yog qhov yooj yim version, zoo rau kev tsim kho. Q235B yog ib qho kev ua kom zoo me ntsis nrog qhov zoo dua qis- qhov kub thiab txias tsis zoo (tsawg dua sulfur), ua rau nws zoo dua rau ntau qhov tseem ceeb uas yuav tsum tau tiv taus txias lossis kev ntxhov siab yam tsis muaj kev tawg.
