Q620E thiab Q690E yog siab -lub zog qis- alloy structural steel daim hlau teev los ntawm Suav teb chaws tus qauv GB/T 1591. Qhov kev xaiv qhia lawv qhov tsawg kawg nkaus yield zog (620 MPa thiab 690 MPa, ntsig txog) thiab cov "E" suffix guarantees cuam tshuam toughness ntawm 4 {9 degree. Cov qib no sawv cev rau qib siab-kawg qib ntawm cov qauv steel hauv tsev, tsim kho rau cov khoom siv tseem ceeb thiab hnyav hnyav xws li loj- ncua kev txuas hniav, offshore platforms, hnyav-cov khoom siv mining, thiab siab -kev ua haujlwm siv tshuab, qhov zoo tshaj plaws kev sib xyaw ua ke ntawm ultra-high-temperature.{14}
Qhov txawv tseem ceeb:
Thawj qhov txawv yog lawv lub zog. Q620E muaj qhov tsawg kawg nkaus lub zog ntawm 620 MPa, thaum Q690E muab lub zog siab dua ntawm 690 MPa. Qhov kev nce ntxiv no tso cai rau kev thauj khoom ntau dua -cov kabmob muaj peev xwm lossis ntxiv qhov hnyav ntxiv hauv cov qauv tsim qauv.
Ua kom tiav lub zog ntau dua ntawm Q690E thaum tswj qhov xav tau -40℃toughness yuav tsum tau tsim cov hlau alloy ntau dua thiab cov txheej txheem thermomechanical tswj (TMCP). Piv rau Q620E, Q690E feem ntau koom nrog cov tshuaj ua kom zoo dua qub nrog kev ua tib zoo sib npaug ntawm cov micro-alloying cov ntsiab lus (xws li Niobium, Vanadium, Titanium) thiab nruj dua tswj cov pa roj carbon thiab manganese cov ntsiab lus. Yog li ntawd, Q690E muaj cov pa roj carbon ntau dua (Ceq). Qhov no ua rau muaj qhov tshwj xeeb tshaj tawm cov teeb meem kev tsim khoom. Vuam Q690E xav tau cov txheej txheem nruj heev: kev siv tshwj xeeb tsim nyog, ultra-siab- lub zog thiab siab -tuaj vuam siv tau, kev tswj xyuas nruj me ntsis ntawm preheating (feem ntau yuav tsum tau kub siab tshaj 100℃) thiab interpass kub, inputs, nruj thiab txwv nyob rau hauv ntau yam. post-weld heat treatment (PWHT) los tiv thaiv hydrogen-induced cracking thiab khaws cia lub toughness nyob rau hauv weld tshav kub-tshem tawm tsam.
Q620E Tshuaj yuav tsum tau
|
Qib |
Chemical xav tau los yog cov khoom Max % |
|||||||||||||
|
|
C |
Si |
Mn |
P |
S |
Cu |
Cr |
Ni |
Mo |
B |
V |
Nb |
Ti |
|
|
Q620E |
0.2 |
0.8 |
1.7 |
0.020 |
0.010 |
0.5 |
1.5 |
2 |
0.7 |
0.005 |
0.12 |
0.06 |
0.05 |
|
Q690E Tshuaj yuav tsum tau
|
Qib |
Chemical xav tau los yog cov khoom Max % |
|||||||||||||
|
|
C |
Si |
Mn |
P |
S |
Cu |
Cr |
Ni |
Mo |
B |
V |
Nb |
Ti |
|
|
Q690E |
0.2 |
0.8 |
1.7 |
0.020 |
0.010 |
0.5 |
1.5 |
2 |
0.7 |
0.005 |
0.12 |
0.06 |
0.05 |
|
Q620E Khoom nyob rau hauv tensile thiab yield zog, thiab cuam tshuam kev xeem yuav tsum tau
|
Qib |
Khoom |
Impact test |
|||||||||
|
Q620E |
Yield Mpa Min |
Tensile Mpa |
Elongation |
Min J |
|||||||
|
Thickness hli |
Thickness hli |
Qib |
|||||||||
|
50 |
50-100 |
100-150 |
50 |
50-100 |
100-150 |
% |
0 |
-20 |
-40 |
-60 |
|
|
620 |
580 |
560 |
700-890 |
650-830 |
15 |
|
|
37 |
|
||
Q690E Khoom nyob rau hauv tensile thiab yield zog, thiab cuam tshuam kev xeem yuav tsum tau
|
Qib |
Khoom |
Impact test |
|||||||||
|
Q690E |
Yield Mpa Min |
Tensile Mpa |
Elongation |
Min J |
|||||||
|
Thickness hli |
Thickness hli |
Qib |
|||||||||
|
50 |
50-100 |
100-150 |
50 |
50-100 |
100-150 |
% |
0 |
-20 |
-40 |
-60 |
|
|
690 |
650 |
630 |
770-940 |
710-900 |
14 |
|
|
37 |
|
||
