Core Relationship & Positioning
Q355B: Suav teb tus qauvGB/T 1591-2018siab -lub zog qis- hlau alloy,nominal yield zog Ntau tshaj los yog sib npaug rau 355 MPa.
S355 JR: European txheemTS EN 10025-2structural hlau,yield zog Ntau tshaj los yog sib npaug rau 355 MPa.
✅ Kev sib raug zoo: Cov no yogcov qhab nia sib npaug thoob ntiaj tebnrog ze li zoo tib yam mechanical zog, txawm tias qhov sib txawv muaj nyob rau hauv cov qauv thiab cov kev cai.
Critical Parameter Sib piv
| Khoom | Q355B(GB/T 1591) | S355 JR(EN 10025) | Qhov txawv tseem ceeb |
|---|---|---|---|
| Yield zog (MPa) | Ntau dua lossis sib npaug rau 355 (thickness Tsawg dua lossis sib npaug li 16mm) | Ntau dua lossis sib npaug rau 355 (thickness Tsawg dua lossis sib npaug li 16mm) | Ib yam |
| Tensile zog (MPa) | 470–630 | 470–630 | Ib yam |
| Elongation (%) | Ntau dua lossis sib npaug rau 21 (thickness Tsawg dua lossis sib npaug li 40mm) | Ntau dua lossis sib npaug 22 | S355JR me ntsis siab dua |
| Impact Toughness | -20 degree, Ntau dua lossis sib npaug rau 34J(longitudinal) | +20℃, Ntau dua lossis sib npaug li 27J(transverse) | Q355B muaj nruj dua -temp qhov yuav tsum tau muaj |
| Carbon sib npaug (Ceq) | Tsawg dua lossis sib npaug li 0.44% | Tsawg dua lossis sib npaug li 0.40% | S355JR muaj kev sib txuas zoo dua |
| P/S Tswj | P Tsawg dua lossis sib npaug rau 0.030%, S Tsawg dua lossis sib npaug rau 0.025% | P Tsawg dua lossis sib npaug rau 0.035%, S Tsawg dua lossis sib npaug rau 0.035% | Q355B muaj purity ntau dua |
| Thickness Derating | >16-35mm: Ntau dua lossis sib npaug rau 335 MPa | >16-40mm: Ntau dua lossis sib npaug rau 345 MPa | S355JR khaws lub zog ntau dua rau cov phaj tuab |
Summary of Critical Differences
Tsawg-Tsub Toughness
Q355B: Yuav tsum tau-20℃cuam tshuam kuaj(qhov tseem ceeb ntawm GB tus qauv).
S355 JR: Tsuas yog xav tau+20℃cuam tshuam. Rau cov xwm txheej Arctic, sivS355J2(-20 ° C).
🔥 Kev txiav txim siab yuam sij: Ua ntej Q355B lossis S355J2 rau thaj chaw txias (xws li Scandinavia, Canada).
Tshuaj Tswj
Q355B: nruj dua P/S txwv (P Tsawg dua lossis sib npaug rau 0.030%, S Tsawg dua lossis sib npaug rau 0.025%), txo qhov pheej hmoo ntawm brittleness.
S355 JR: Lower Ceq limit (Tsawg dua lossis sib npaug li 0.40%), marginally txo weld -kev pheej hmoo tawg.
Lub zog txo rau Thickness
Piv txwv li 40mm thickness:
Q355B: Ntau dua lossis sib npaug li 335 MPa
S355JR:Ntau dua lossis sib npaug li 345 MPa
⚠️ For thick-walled structures (>40mm), S355JR muab ntau zog tuav.
Daim ntawv thov Scenario
| Scenario | Pom zoo Qib | Kev xav |
|---|---|---|
| Cov haujlwm hauv Suav teb | Q355B | Ua raws li GB tus qauv, tsis muaj ntawv pov thawj nyiaj siv ua haujlwm |
| Export tej yaam num rau cov teb chaws Europe | S355 JR | Kev ua raws cai ncaj qha nrog CE / EN cov qauv |
| Tsawg-temp kev pabcuam (tsawg dua lossis sib npaug li -20 degree) | Q355Blos yogS355J2 | Raws li yuav tsum tau -20℃cuam tshuam yuav tsum tau |
| Thick-wall pipes (>40mm) | S355 JR | Superior zog tuav |
Hloov Cov Lus Qhia
Q355B → S355JR: Kev hloov ncaj qha ua tau (yuav tsum tau +20 daim ntawv qhia txog kev cuam tshuam kev ntsuas).
S355JR → Q355B: Yuav tsum validate-20℃cuam tshuam kev ua haujlwm(feem ntau S355JR batches poob).
Cov ntaub ntawv thoob ntiaj teb:
Suav specs: Mark"Q355B (≈EN S355JR)"
Cov ntawv cog lus European: Xeev"S355JR (GB/T 1591: Q355B)"
