S355ML vs S355NL yog ib qho kev sib piv hauv cov qauv hlau xaiv, vim ob qib siab - zog, qis- alloy steels raws li EN 10025 tus qauv tab sis txawv ntawm kev ua thiab kev ua haujlwm. S355NL, tau teev tseg hauv EN 10025-3, yog cov hlau zoo li qub, thaum S355ML, raws li EN 10025-4, yog thermomechanically dov (TMCP).
S355NL (EN 10025-3)
S355NL yog ib qho zoo li qub lossis zoo li qub dov zoo -cov qauv hlau nrog:
S: Cov qauv hlau.
355: Tsawg tshaj tawm lub zog ntawm 355 MPa (tsawg dua lossis sib npaug li 16 hli).
NL: Zoo li qub, nrog rau kev cuam tshuam toughness kuaj ntawm -50℃rau cov ntawv thov kub qis.
Nws cov txheej txheem normalization ua kom lub microstructure refined, zoo tagnrho rau cov huab cua txias xws li offshore platforms.
S355ML (EN 10025-4)
S355ML yog ib qho thermomechanically dov (TMCP) zoo -cov qauv hlau nrog:
S: Cov qauv hlau.
355: Tsawg tshaj tawm lub zog ntawm 355 MPa (tsawg dua lossis sib npaug li 16 hli).
ML: Thermomechanically dov, nrog kev cuam tshuam toughness kuaj ntawm -50 degree.
TMCP tsim cov nplej zoo dua, txhim kho lub zog thiab weldability, feem ntau ntawm tus nqi qis dua li normalization.
Kev sib piv tshuaj lom neeg
|
Element |
S355NL (EN 10025-3, Ladle, max %) |
S355ML (EN 10025-4, Ladle, max %) |
|---|---|---|
|
Cov pa roj carbon (C) |
0.18 |
0.14 |
|
Silicon (Si) |
0.50 |
0.50 |
|
Manganese (Mn) |
0.90-1.65 |
1.60 |
|
Phosphorus (P) |
0.025 |
0.025 |
|
Sulfur (S) |
0.015 |
0.020 |
|
Nitrogen (N) |
0.015 |
0.015 |
|
Aluminium (Al) |
0.02 (min, tag nrho) |
0.02 (min, tag nrho) |
|
Niobium (Nb) |
0.05 |
0.05 |
|
Vanadium (V) |
0.12 |
0.10 |
|
Titanium (Ti) |
0.05 |
0.05 |
|
Chromium (Cr) |
0.30 |
0.30 |
|
Nickel (Ni) |
0.30 |
0.30 |
|
Molybdenum (hli) |
0.10 |
0.20 |
|
Copper (Cu) |
0.55 |
0.55 |
Mechanical Properties Sib piv
|
Khoom |
S355NL (EN 10025-3) |
S355ML (EN 10025-4) |
|---|---|---|
|
Yield zog (min, MPa) |
||
|
Tsawg dua los yog sib npaug li 16 hli |
355 |
355 |
|
16 |
345 |
355 |
|
40 |
335 |
345 |
|
Tensile zog (MPa) |
470-630 |
450-610 |
|
Elongation (min,%) |
22 (tsawg dua lossis sib npaug li 63 hli) |
22 (tsawg dua lossis sib npaug li 40 mm) |
|
Impact Zog (min, J) |
27 @ -50℃(longitudinal) |
27 @ -50℃(longitudinal) |
Vuam thiab kev kho cua sov
S355NL: CEV ≤0.43% supports GMAW or SAW (EN 1011-2). Preheating (100-150°C) for >20 hli; PWHT (550-650 degree) xaiv tau. Consumables: ER70S-6 (GMAW), EM12K flux nrog EH14 hlau (SAW).
S355ML: Lower CEV (≤0.39%) enhances weldability, often requiring less preheating (50-100°C for >20 mm). Tib yam khoom siv siv tau.
S355NL vs S355ML vuam kev sib piv nyiam S355ML rau tus nqi-ntau fabrication vim nws cov txheej txheem TMCP.
Daim ntawv thov
S355 NL:
Offshore platforms nyob rau hauv qhov chaw txias marine.
Cua yees hauv sub- huab cua tsis zoo.
Cov choj thiab cranes nyob rau sab qaum teb.
Nws normalization ua kom muaj kev ntseeg siab thoob plaws ntau qhov tuab (txog 250 hli).
S355ML:
Cov ntawv thov zoo sib xws (offshore, cua yees, txuas hniav) tab sis nyiam nyob rau hauv tej yaam num ua ntej weldability thiab nqi.
Txwv rau cov seem thinner (tsawg dua lossis sib npaug li 120 mm), haum rau cov qauv sib dua.
S355ML S355NL daim ntawv thov sib txawv qhia txog S355NL qhov kev ua tau zoo rau cov phaj tuab thiab S355ML tus nqi- ua tau zoo rau cov nyias nyias.
