Hauv kev yuav khoom steel, txoj kev txhim khu kev qha tshaj plaws los xyuas cov khoom koj yuav yog los ntawm kev tshuaj xyuas covMill Test Certificate (MTC). Thaum ob leegS355 JRthiabS355MCQhia tawm qhov tsawg kawg nkaus lub zog ntawm 355 MPa, lawv cov qauv kev tsim khoom thiab cov tshuaj muaj pes tsawg leeg sib txawv heev.
Ntawm no yog qhov sib txawv ntawm qhov sib txawv tseem ceeb los nrhiav ntawm MTC.
1. Executive Standard (Tus Thawj Qhov Ntsuas)
Qhov no yog qhov sib txawv tshaj plaws thiab yuav tsum yog thawj qhov koj tshawb xyuas.
- S355JR:Yuav tsum teevTS EN 10025-2.(Technical delivery condition for non-alloy structural steels).
- S355MC:Yuav tsum teevTS EN 10149-2.(Technical delivery conditions for thermomechanically dov steels for txias forming).
2. Kev Xa Khoom
Qhov no qhia txog cov txheej txheem kev siv, uas cuam tshuam ncaj qha rau cov hlau muaj peev xwm yuav khoov.
- S355JR:Feem ntau cim raws li+ AR(Raws li Rolled) los yog+N(Normalized).
- S355MC:Yuav tsum tau cim tias+M(Thermomechanically dov).
Nco tseg: Yog tias koj pom "+N" (Nco tseg) ntawm MTC thov kom yog S355MC, nws yuav tsis raug. MC qib cia siab rau Thermomechanical Control Processing (TMCP) kom ua tiav cov qauv zoo, tsis yog normalizing.
3. Chemical Composition (Lub "DNA" ntawm cov hlau)
S355MC yog tshuaj purer kom ntseeg tau tias nws tsis tawg thaum khoov.
| Element | S355JR (Cov qauv dav dav) | S355MC (High Yield / Cold forming) | Nws txhais li cas |
| Cov pa roj carbon (C) | Siab dua (tsawg dua lossis sib npaug rau 0.24%) | Tsawg heev(feem ntau Tsawg dua lossis sib npaug rau 0.12%) | Cov pa roj carbon qis kom ntseeg tau qhov zoo tshaj plaws weldability thiab toughness ntawm MC qib. |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.035% | Tsawg heev(tsawg dua lossis sib npaug rau 0.010%) | Tsawg leej faj txo cov kev suav nrog, tiv thaiv cov kab nrib pleb thaum lub caij txias. |
| Silicon (Si) | Tsawg dua lossis sib npaug li 0.55% | Feem ntau Tsawg (tsawg dua lossis sib npaug rau 0.03%) | MC feem ntau yog Aluminium -tua nrog silicon tsawg kom zoo dua nto. |
| Micro{0}} alloys | Tsis yuam | Nb, Ti, V | NrhiavNiobium (Nb) los yog Titanium (Ti). Cov no yog qhov tseem ceeb rau kev kho cov nplej hauv qib MC. |
4. Mechanical Properties
Thaum ob qho tib si yog qib "355", qhov kev ntsuam xyuas qhov sib txawv.
Impact Test:
- S355JR:tsom rua Impact Energy at20 degree(Room Temp, min 27J).
- S355MC:Thaum nws muaj zog heev (feem ntau kuaj ntawm -20 degree), lub hom phiaj tseem ceeb ntawm MTC yog nyob rau ductility.
Elongation:
S355MC:Feem ntau qhia tau zoo heevsiab elongation tus nqi (>23%) piv rau S355JR, qhia tau hais tias zoo dua ductility rau ncab yam tsis muaj caj dab.
5. Technological Properties (Bend Test)
Nov yog ntu "Deal Breaker" rau daim ntawv thov txias.
S355JR:Tshooj lus no feem ntau khoob lossis tsuas yog cim "Zoo siab." Kev ntsuas khoov nruj tsis yog tus qauv.
S355MC: Yuav tsum muaj cov ntaub ntawv Bend Test.
Koj yuav pom Mandrel Diameter (piv txwv li, 0.5t lossis 1t). Qhov no qhia tau tias cov hlau tuaj yeem khoov mus rau lub vojvoog nruj yam tsis muaj qhov tawg.
Summary: Yuav Qhia Li Cas Hauv 10 Seconds?
"Saib tus Qauv No. thiab Cov Ntsiab Lus Sulfur."
- Yog MTC haisTS EN 10025-2thiab Sulfur nyob ib ncig ntawm0.025%→ Nws yogS355 JR(Siv rau kab teeb, kab, thiab kev tsim kho dav dav).
- Yog MTC haisTS EN 10149-2, Sulfur yog<0.010%, thiab nws muajNb/Ti→ Nws yogS355MC(Siv rau txias khoov profiles, automotive chassis, thiab complex duab).