Core Differences & Classification
| Parameter | Q355B(Suav Standard) | SIB 400(Japanese Standard) |
|---|---|---|
| Txuj | GB / T 1591-2018 (HSLA Hlau) | JIS G3101-2017 (Carbon Steel) |
| Hom khoom | Micro{0}} alloyed hlau(Nb/V/Ti) | Plain Carbon hlau(Tsis muaj alloys) |
| Lub hauv paus muaj zog | Yield zog ntau dua los yog sib npaug rau 355 MPa(t Tsawg dua lossis sib npaug li 16mm) | Tensile Strength Ntau dua lossis sib npaug li 400 MPa(Tsis muaj yield guarantee) |
| Kev siv yam | Load-cov kabmob, cov kav dej siab | Lub teeb ncej, tsis yog - cov qauv npog |
🔍 Qhov Tseem Ceebq355b yogsiab -lub zog steel, thaum SS400 yog ibgeneral -lub hom phiaj carbon steel- Lawv nyob rau ntau theem kev ua tau zoo.
Kev sib piv tseem ceeb
1. Mechanical Properties
| Khoom | Q355B | SIB 400 |
|---|---|---|
| Yield zog (MPa) | Ntau dua lossis sib npaug rau 355(t Tsawg dua lossis sib npaug li 16mm) | Tsis tau lav |
| Tensile zog (MPa) | 470–630 | 400-510 (t Tsawg dua lossis sib npaug li 16mm) |
| Elongation (%) | Ntau dua lossis sib npaug li 21 | Ntau dua lossis sib npaug li 17 |
| Impact Toughness | -20 degree, Ntau dua lossis sib npaug rau 34J(yuav tsum tau) | Tsis xav tau |
| Thickness nyhuv | Lub zog ↓ li thickness ↑ (Δ Tsawg dua lossis sib npaug li 40MPa) | Lub zog ruaj khov |
2. Chemical Composition (%)
| Element | Q355B | SIB 400 |
|---|---|---|
| C | Tsawg dua los yog sib npaug li 0.20 | Tsawg dua lossis sib npaug li 0.29 |
| Mn | 1.00–1.60 | Tsis tau teev tseg |
| P | Tsawg dua lossis sib npaug li 0.030 | Tsawg dua lossis sib npaug li 0.050 |
| S | Tsawg dua lossis sib npaug li 0.025 | Tsawg dua lossis sib npaug li 0.050 |
| Cov hlau nplaum | Nb/V/Ti added | Tsis muaj |
⚠️ Q355B qhov zoo:
40% siab dua yield zogtshaj SS400
Guaranteed qis -temp toughness(SS400 tsis muaj kev cuam tshuam kev sim)
Superior purity(50% qis dua P / S cov ntsiab lus)
Daim ntawv thov Scenario
| Daim ntawv thov | Pom zoo Qib | Yog vim li cas |
|---|---|---|
| Load-cov kabmob | Q355B | Siab zog + dynamic load kuj |
| Sub-zero ib puag ncig (tsawg dua lossis sib npaug rau -20 degree) | Q355B | Yuav tsum tau cuam tshuam toughness |
| Tsawg- cov kav dej siab | SIB 400 | Tus nqi -nqi (~ 85% ntawm Q355B) |
| Tej yaam num hauv Nyiv | SIB 400 | Kev ua raws li JIS |
International sib npaug
| Thaj tsam | Zoo ib yam li Q355B | Zoo ib yam li SS400 |
|---|---|---|
| Tuam Tshoj | Q355B (GB/T 1591) | Q235B (qis zog) |
| Teb chaws Europe | S355JR (EN 10025) | S235JR (EN 10025) |
| Teb chaws USA | A572 Gr.50 (ASTM) | A36 (ASTM) |
