Q235 Steel yog dab tsi
Q235 yog cov pa roj carbon structural steel txhais los ntawm GB / T 700, Suav teb tus qauv rau kev dav dav -cov hom phiaj carbon structural steels. Tsab ntawv Q stands rau yield zog thiab 235 yog qhov tsawg kawg nkaus yield zog nyob rau hauv megapascals. Nws yog cov feem ntau siv cov qauv carbon steel nyob rau hauv Suav teb rau cov tsev, txuas hniav, machinery thiab welded yeeb nkab, thiab nws yog cov khoom txheem ntawm ntau ERW thiab kauv welded kav muab raws li GB / T 3091.
Thaum tus neeg yuav khoom nug txog lub zog compressive ntawm Q235 yeeb nkab, cov lus teb nyob ntawm seb lub zog yog txhais li cas: lub zog tawm los, uas tswj kev tsim, lossis lub zog kawg hauv qab crushing load. Qhov ob tsis zoo ib yam, thiab kev tsis meej pem lawv ua rau cov yeeb nkab tsis zoo los yog loj heev.
Compressive Strength vs Yield Strength
Nyob rau hauv compression, ib tug luv luv steel tswv cuab tsis los ntawm yielding los yog crushing, tsis yog los ntawm buckling. Rau lub hom phiaj tsim, engineers piv cov kev siv compressive kev nyuaj siab tiv thaiv lub zog tawm los muab faib los ntawm ib qho kev nyab xeeb. Rau Q235 qhov no txhais tau hais tias qhov kev siv zog compressive pib los ntawm 235 MPa muab faib los ntawm qhov muaj feem xyuam ntawm kev nyab xeeb, ua ntej txhua daim tshev buckling ua tiav rau cov tswv cuab sib luag.
Qhov kawg compressive zog ntawm Q235 yog nyob ze rau nws tensile zog ntau ntawm 370 mus rau 500 MPa, vim ductile steel tsis nyob rau hauv compression nyob rau hauv kwv yees li ntawm tib qhov tseeb kev nyuaj siab theem raws li nyob rau hauv nro. Nyob rau hauv cov nqe lus tswv yim:
Tsim lub hauv paus hauv compression: yield zog, 235 MPa rau thickness txog 16 hli
Qhov kawg crushing zog: nyob rau hauv lub 370 - 500 MPa ntau, ze rau lub tensile ntau
Yog li cov lus tshaj tawm hais tias lub zog compressive ntawm Q235 yog 235 MPa yog luv luv rau lub zog tawm los yog 235 MPa, uas yog lub hauv paus raug rau kev tsim.
Mechanical Properties ntawm Q235 ib GB / T 700
| Khoom | Tus nqi | Nco tseg |
|---|---|---|
| Qhov ntom | 7,85g 3 | Standard carbon hlau ntom ntom |
| Yield zog | Tsawg kawg yog 235 MPa | Thickness mus txog 16 mm |
| Yield zog | Tsawg kawg yog 225 MPa | 16-40 hli thickness |
| Yield zog | Tsawg kawg yog 215 MPa | 40-100 hli thickness |
| Tensile zog | 370 - 500 MPa | Thickness mus txog 100 mm |
| Elongation A | Tsawg kawg yog 26% | Nyob ntawm cov khoom tsim thiab thickness |
| Modulus ntawm elasticity | Txog 206 GPa | Chav kub |
Nco ntsoov tias 235 MPa yield tus nqi siv rau thickness mus txog 16 hli; Raws li phab ntsa thickness nce, cov lus qhia tawm poob rau 225 MPa thiab tom qab ntawd 215 MPa. Ib qho hnyav-phab ntsa Q235 yeeb nkab tsis nqa tib lub zog raws li nyias nyias.
Q235A, Q235B, Q235C thiab Q235D: Tsab ntawv txhais li cas?
Tsab ntawv tom qab yog qib zoo raws li kev cuam tshuam toughness thiab impurity tswj, tsis yog lub zog:
| Qib | Impact test kub | Hom kev siv |
|---|---|---|
| Q235A | Tsis tau teev tseg | General lug, ncej, kab teeb |
| Q235B | +20 C | Welded qauv, kav dej thiab tso tsheb hlau luam; qib tshaj plaws rau welded yeeb nkab |
| Q235C | 0 C | Cov qauv yuav tsum zoo dua qis -kub toughness |
| Q235D | -20 C | Cov cheeb tsam txias, dynamically loaded lug |
Q235B yog qib qub rau welded steel yeeb nkab vim nws lav qhov cuam tshuam lub zog ntawm 20 C, uas npog feem ntau sab hauv tsev thiab sab nraum zoov.
Q235 vs Q355 vs SS400
| Qib | Txuj | Yield, mus txog 16 mm | Tensile | Hom kev siv |
|---|---|---|---|---|
| Q235 | GB/T 700 | 235 MPa rau | 370 - 500 MPa | General qauv, welded yeeb nkab |
| Q355 | GB/T 1591 | 355 MPa rau | 470 - 630 MPa | Siab dua -load qauv, cranes, choj |
| SIB 400 | JIS G3101 | Txog 245 MPa | 400 - 510 MPa | Rolled steel rau cov qauv dav dav |
Q355 raug nqi ntau dua Q235 vim tias cov ntsiab lus alloy siab dua thiab tswj nruj dua, thiab nws tau teev tseg thaum tsim kev ntxhov siab yuav txwv tsis pub lub phab ntsa hnyav dua hauv Q235. SS400 tau teev tseg los ntawm tensile lub zog ntau dua li cov txiaj ntsig, thiab nws cov txiaj ntsig raug kwv yees li 245 MPa yog ze rau Q235, uas yog vim li cas ob qho tib si feem ntau hloov pauv rau ib leeg hauv cov qauv yooj yim.
Kub txwv rau Q235 Yeeb Nkab
Q235 cov khoom muaj ntawv pov thawj ntawm chav tsev kub. Kev pabcuam txuas ntxiv saum toj no txog 300 C nce zuj zus txo cov khoom muaj zog thiab txhawb kev nkag siab, yog li Q235 tsis pom zoo rau cov kav dej kub - pabcuam; rau elevated -kub kab, siv cov pa roj carbon steel qib uas tau teev tseg rau siab - qhov kub thiab txias, xws li ASTM A106 Qib B lossis GB / T 5310 20G. Thaum qis kawg, daim ntawv qib txiav txim siab qhov txwv: Q235B raug ntsuas rau +20 C qhov kev ntsuas qhov cuam tshuam, Q235C txog 0 C thiab Q235D rau -20 C. Rau cov kev pabcuam kav dej hauv qab -20 C, qib qis qis xws li Q355D lossis cov hlau yuav tsum raug xaiv zoo.
Q235 hauv Welded Yeeb Nkab: Yuav Qhia Li Cas
Rau welded steel yeeb nkab nyob rau hauv Q235, cov qauv kev yuav khoom yog GB / T 3091, welded steel yeeb nkab rau qis - kev pab cuam lub siab, thiab GB / T 13793, longitudinally welded steel yeeb nkab. Ntawm qhov kev txiav txim, qhia tus qauv, qib nrog nws cov lus, piv txwv li Q235B, sab nraud txoj kab uas hla thiab phab ntsa thickness, qhov ntev, qhov kawg kev npaj, tiaj los yog beveled, thiab cov kev xeem yuav tsum tau: kev ntsuam xyuas hydrostatic, eddy tam sim no los yog ultrasonic xeem, thiab cov chav kawm kam rau ua.
FAQ
Q1: Puas yog lub zog compressive ntawm Q235 235 MPa?
235 MPa yog qhov tsawg kawg nkaus yield zog rau thickness mus txog 16 hli. Vim hais tias compression tsim yog txwv los ntawm yield, tus nqi no yog lub hauv paus tsim; qhov kawg compressive zog ntawm Q235 yog nyob rau hauv 370 - 500 MPa ntau, ze rau nws tensile zog.
Q2: Qhov txawv ntawm Q235 thiab Q355 yog dab tsi?
Q355 muaj qhov tsawg kawg nkaus tawm los ntawm 355 MPa, kwv yees li 50% siab dua Q235, muaj zog tensile ntau dua thiab zoo dua toughness, ntawm tus nqi siab dua. Q235 yog xaiv qhov twg muaj zog nruab nrab thiab zoo weldability txaus.
Q3: Qhov txawv ntawm Q235A thiab Q235B yog dab tsi?
Q235B lav qhov cuam tshuam rau qhov hnyav ntawm 20 C thiab muaj qis sulfur thiab phosphorus txwv, ua rau nws nyiam qib rau welded yeeb nkab thiab welded qauv. Q235A tsis muaj qhov yuav tsum tau muaj kev cuam tshuam thiab siv rau qhov yooj yim uas tsis yog - qhov tseem ceeb.
Q4: Q235 puas tuaj yeem welded?
Yog lawm. Q235 muaj qhov zoo tshaj plaws weldability vim nws qhov sib npaug ntawm cov pa roj carbon tsawg, thiab nws tuaj yeem welded los ntawm SAW, MIG, TIG, MMA thiab tsis kam vuam yam tsis muaj preheat nyob rau hauv lub khw muag khoom.
Q5: Qhov ntsuas kub ntawm Q235 yog dab tsi?
Rated zog siv nyob rau hauv chav tsev kub. Kev ua haujlwm tas mus li feem ntau yog txwv rau li 300 C ntawm sab siab thiab -20 C ntawm sab qis rau qib D; qis dua -20 C, qhia kom muaj qhov kub thiab txias.
Q6: Qhov ceev ntawm Q235 yog dab tsi?
7.85 g / cm3, tib yam li lwm cov pa roj carbon steel. Nws yog siv los xam cov yeeb nkab hnyav: unit hnyav kg/m yog hais txog (OD - phab ntsa) x phab ntsa x 0.02466.
