Qhov txawv ntawm q345 thiab q355 yog dab tsi
I. Cov ntsiab lus tseem ceeb sib txawv
| Parameter |
Q345 (GB/T 1591-2008) |
Q355 (GB/T 1591-2018) |
Kev hloov pauv tseem ceeb |
| Qib Qib |
Min. Tawm Zog: 345 MPa |
Min. Yield zog:355 MPa rau |
Cov cim hloov tshiab + nominal zog nce |
| Txheem xwm txheej |
Tsis Siv Neeg (txij thaum 2019) |
Yam yuav tsum tau muaj tam sim no |
Cov haujlwm tshiab yuav tsum siv Q355 |
| Impact Test Temp. |
Qib B:+20 degree |
Qib B:-20 degree |
nruj dua -kub toughness |
| P/S Cov ntsiab lus Max. |
P Tsawg dua lossis sib npaug rau 0.035%, S Tsawg dua lossis sib npaug rau 0.035% |
P Tsawg dua los yog sib npaug rau0.030%, S Tsawg dua los yog sib npaug rau0.025% |
Kev xav tau purity siab dua |
| Sib Max. |
Tsis tau teev tseg |
Tsawg dua lossis sib npaug li 0.44%(Qib B) |
Tshiab weldability tswj parameter |
| Thickness Qib |
3 tiers (tsawg dua los yog sib npaug rau 16/16 ~ 35/35 ~ 50mm) |
4 qib (+>50 ~ 100 hli) |
Txhim kho precision rau cov phaj tuab |
II. Mechanical Properties Comparison (Qib B)
| Thickness (hli) |
Q345B tawm tswv yim (MPa) |
Q355B Yield (MPa) |
Hloov |
| Tsawg dua los yog sib npaug li 16 |
Ntau dua lossis sib npaug rau 345 |
Ntau dua los yog sib npaug355 |
+10 MPa |
| >16~35 |
Ntau dua lossis sib npaug rau 325 |
Ntau dua los yog sib npaug345 |
+20 MPa |
| >35~50 |
Ntau dua lossis sib npaug li 295 |
Ntau dua los yog sib npaug335 |
+40 MPa |
| >50 ~ 100 (Tshiab) |
- |
Ntau dua los yog sib npaug315 |
Qib tshiab |
| Tensile zog |
470~630 |
470~630 |
Tsis hloov |
| Charpy Impact |
20 degree, Ntau dua lossis sib npaug rau 34J |
-20 degree, Ntau dua lossis sib npaug rau 34J |
nruj dua temp. kev xav tau |
Lus Cim: Q355B's -20℃cuam tshuam qhov yuav tsum tau ua raws li qib Q345D qub.
III. Chemical Composition Changes (%)
| Element |
Q345B (2008) |
Q355B (2018) |
Txoj Kev |
| P |
Tsawg dua lossis sib npaug li 0.035 |
Tsawg dua lossis sib npaug li 0.030 |
↓ 14% |
| S |
Tsawg dua lossis sib npaug li 0.035 |
Tsawg dua lossis sib npaug li 0.025 |
↓ 29% |
| Ceq |
- |
Tsawg dua lossis sib npaug li 0.44 |
Tshiab txwv |
