S355 JRyog ib qho ntawm feem ntau siv cov qauv steels nyob rau hauv lub ntiaj teb no, tshwj xeeb tshaj yog nyob rau hauv cov teb chaws Europe, Asia, thiab thoob ntiaj teb tej yaam num. Nov yog cov ncauj lus kom ntxaws txog qhov nws yog dab tsi, los ntawm nws lub npe lub ntsiab lus rau nws cov khoom tseem ceeb thiab kev siv.
1. Kev txiav txim lub npe: "S355JR"
Lub npe raws li qhovTS EN 10025-2tus qauv (European Norm rau kub-rolled structural steels). Txhua ntu qhia ib zaj dab neeg tshwj xeeb:
S:Sawv rau"Structural"hlau.
355:Qhia qhovyam tsawg kawg nkaus yield zog(ReH) nyob rau hauv megapascals (MPa) rau thicknesses Tsawg dua los yog sib npaug li 16 hli. Qhov no txhais tau tias cov hlau yuav pib deform mus tas li ntawm qhov kev ntxhov siab tsawg kawg yog 355 MPa. (Rau qhov sib piv: cov hlau me me S235 yog 235 MPa, thiab qib S460 muaj zog dua yog 460 MPa).
J:Denotes lubcuam tshuam toughness(Charpy V-notch test) ntawm0 degree. Cov hlau yuav tsum nqus qhov tsawg kawg nkaus ntawm 27 Joules ntawm lub zog ntawm qhov kub no.
R:Sawv rau"Rolled", txhais tau hais tias nws yog xa hauv qhov kub - dov mob (raws li qhov tsis zoo los yog lwm yam cua sov- kho lub xeev).
2. Cov yam ntxwv tseem ceeb & cov cuab yeej
Lub zog:Qhov sib npaug zoo ntawm lub zog (355 MPa tawm los, 470-630 MPa tensile) thiab ductility, ua rau nws tsim nyog rau cov khoom siv thauj khoom.
Weldability: Zoo heev.Qhov no yog ib qho ntawm nws qhov zoo tshaj plaws. Nws cov tshuaj muaj pes tsawg leeg yog tswj kom muaj qhov qisCarbon Equivalent (CEV), uas txo qhov kev pheej hmoo ntawm kev tawg thaum vuam yam tsis tas yuav tsum tau ua ntej - lossis tshaj tawm - cua sov hauv feem ntau cov xwm txheej.
Toughness:Lub guaranteed cuam tshuam tsis kam ntawm 0℃("J" zoo) ua rau nws haum rau cov qauv nyob rau hauv temperate climates uas kub yuav poob ib ncig los yog me ntsis hauv qab khov.
Formability:Nws tuaj yeem raug txiav, xuas nrig ntaus, drilled, thiab khoov mus rau qhov tsim nyog, uas yog qhov tseem ceeb rau kev tsim khoom.
3. Chemical Composition (Hloov ntau yam)
Cov kev txwv tseeb yog txhais los ntawm EN 10025-2, tab sis ib qho kev sib xyaw ua ke yog:
Cov pa roj carbon (C):Tsawg dua lossis sib npaug li 0.24% - Khaws qis kom zoo weldability.
Manganese (Mn):Tsawg dua lossis sib npaug li 1.60% - Ua kom muaj zog thiab tawv.
Silicon (Si):Tsawg dua lossis sib npaug li 0.55% - A deoxidizer.
Phosphorus (P) & Sulfur (S):Tsawg dua los yog sib npaug rau 0.045% txhua tus (cov impurities khaws cia tsawg).
Carbon Equivalent (CEV):Max ~ 0.40-0.43% (nyob ntawm qhov tuab) - Tus nqi suav uas kwv yees weldability.
4. Kev siv ntau
S355JR yog cov hlau ua haujlwm rau ntau yam ntawm cov qauv siv:
Kev tsim vaj tsev:Hlau ncej, kab teeb, kab, thiab kev txhawb nqa rau cov tsev lag luam thiab kev lag luam.
Choj thiab Infrastructure:Txhawb cov qauv, gantry, thiab nkag mus rau platforms.
Heavy Machinery & Khoom siv:Chassis, ncej, thiab booms rau cranes, excavators, thiab ua liaj ua teb machinery.
Cov nroj tsuag muaj:Txhawb cov qauv, kev taug kev, thiab chaw cia khoom.
Shipbuilding & Offshore:Rau cov uas tsis yog- cov yam ntxwv tseem ceeb (qib siab dua yog siv rau thawj cov qauv hull).
5. Muaj Daim Ntawv Thov
Nws yog dav muaj nyob rau hauv tag nrho cov qauv:
Phaj thiab Ntawv
Cov Txheej Txheem:I-beams (IPE, HE), H-beams, channels (UNP), ces kaum (L), hollow seem (SHS, RHS), thiab rounds.
Flats, Bars, thiab Rebars
Sib piv nrog Lwm Cov Qib Siab
vs S235JR:S355JR muaj zog dua (355 vs . 235 MPa tawm los). Koj tuaj yeem siv nws tsawg dua rau tib lub nra, ua rau cov qauv sib dua, tab sis nws yog me ntsis ductile thiab tuaj yeem nyuaj rau daim ntawv.
vs S355J2 / S355K2:Cov no yog cov qib nyuaj dua.J2yog kuaj ntawm -20 degree, thiabK2ntawm -20℃nrog siab dua absorbed zog (40J). Siv cov no rau qhov chaw txias dua.
vs S355NL:Qib "normalized dov" nrog rau qhov zoo dua toughness ntawm qhov kub thiab txias (kuaj ntawm -50 degree), siv rau kev siv tseem ceeb xws li offshore platforms.
ASTM A36 (USA):Raws li tau tham yav dhau los, A36 yog qhov ze tshaj plaws Asmeskas sib npaug rau kev siv dav dav, txawm hais tias nws tau teev tseg qhov tsawg kawg nkaus tawm lub zog qis dua (250 MPa / 36 ksi).ASTM A572 Qib 50(345 MPa / 50 ksi tawm los) yog qhov sib tw ua kom muaj zog.
Cov ntsiab lus
S355JR yog qhov nruab nrab - lub zog, tsis yog - alloy structural steel yam ntxwv los ntawm weldability zoo heev thiab lav qhov cuam tshuam ntawm 0℃.Nws qhov zoo tshaj qhov sib npaug ntawm cov khoom, muaj, thiab tus nqi -kev ua tau zoo ua rau nws yog qhov kev xaiv zoo tshaj plaws rau ntau yam ntawm cov qauv kev tsim vaj tsev nyob thoob plaws ntiaj teb uas yuav tsum muaj lub zog nruab nrab thiab zoo toughness.