A572 Qib 50yog ib hom, siab - zog, qis- alloy (HSLA) cov qauv steel nrog qhov tsawg kawg nkaus tawm lub zog ntawm 50 ksi (50,000 psi), paub txog nws lub zog zoo heev - rau - qhov hnyav piv, ua rau nws zoo tagnrho rau cov choj, kev tsim kho hnyav, tsheb thav duab, thiab ncej, raws li nws muab qhov tseem ceeb ntawm cov hlau 6. Nws yog yooj yim weldable thiab formable, feem ntau hloov cov qib qub, thiab yog siv nyob rau hauv kab, raws, ces kaum, thiab daim hlau rau thov thov.
Cov khoom tseem ceeb
Yield zog: Yam tsawg kawg 50 ksi (50,000 psi)
Tensile zog: Yam tsawg kawg nkaus 65 ksi (65,000 psi)
Hom: Siab-Lub zog qis-Alloy (HSLA) Columbium-Vanadium Steel
Weldability:
Zoo, zoo ib yam li A36 steel
Dab tsi yog qhov sib npaug ntawm A572 Qib 50 hauv cov qauv European?
Qhov ze tshaj plaws nyob sab Europe sib npaug rau ASTM A572 Qib 50 yog S355J2 (+N) raws li EN 10025-2:2019, txawm hais tias qhov kev sib tw yog nyob ntawm qib uas yuav tsum tau muaj rau kev cuam tshuam toughness thiab daim ntawv ntawm cov khoom.
Nov yog cov ncauj lus kom ntxaws txog qhov sib npaug:
Kev sib piv ncaj qha: A572 Qib 50 vs. S355J2
| Khoom | A572 Qib 50 (ASTM A572) | Qhov sib npaug European: S355J2 (EN 10025-2) |
|---|---|---|
| Yam tsawg kawg Yield Strength (ReH) | 50 ksi (345 MPa) | 355 MPa (rau thicknesses Tsawg dua los yog sib npaug rau 16mm) * |
| Tensile zog (Rm) | 65 ksi min (450 MPa min) | 470 - 630 MPa |
| Hom khoom | Siab-Lub zog qis-Alloy (HSLA) | Tsis yog - alloy zoo structural steel |
| Kev Xa Khoom | Feem ntau raws li - dov (normalized yeem) | Normalized (+N) lossis raws li - dov |
| Qhov Tseem Ceeb | Txhais los ntawm mechanical zog; chemistry yog hloov tau. | Txhais los ntawm ob qho tib si mechanical zog thiab yuav tsum muaj kev cuam tshuam toughness. |
*Note on Yield Strength by Thickness: Both grades have de-rated yield strength for thicker sections. For example, S355J2 has a 355 MPa yield for ≤16mm, but drops to 335 MPa for >16-40mm, and 315 MPa for >40-63 hli. Nco ntsoov xyuas lub zog rau cov khoom tuab.
Xaiv qhov raug European "S355" Sub-Qib
Lub npe "J2" yog qhov tseem ceeb. European S355 steels yog subdivided los ntawm lawv tej yam toughness (Charpy V-notch) ntsuas kub:
S355J2: Kuaj ntawm -20 degree. Qhov no yog qhov sib tw tshaj plaws thiab ncaj qha rau kev siv cov qauv siv.
S355J0: Kuaj ntawm 0 degree. Siv rau cov ntawv thov ambient tsawg dua.
S355J2 (+N): Qhov "+N" qhia txog kev xa khoom ib txwm muaj, uas feem ntau yog qhov zoo tshaj plaws match rau microstructural mob ntawm A572 Qib 50. Nws yog ib qho kev pom zoo rau daim hlau.
S355K2: Kuaj ntawm -20℃nrog rau kev cuam tshuam lub zog ntau dua li J2. Siv rau cov ntawv thov tseem ceeb dua.
S355N / NL: Rau cov phaj tuab tuab nrog kev txhim kho toughness ntawm qis kub (-20℃lossis -50 degree), raws li EN 10025-3.
Kev txiav txim siab tseem ceeb rau kev hloov pauv
Tsis yog 1: 1 Hloov: Cov qauv txheej txheem (ASTM vs. EN) txawv. Kev hloov pauv yuav tsum muaj kev pom zoo raws li txoj cai tsim qauv (xws li Eurocode 3 vs. AISC).
Cov Khoom Muag Khoom: Qhov sib npaug yuav raug teev nyob rau hauv cov qauv khoom sib txawv:
Rau Cov Txheej Txheem Txheej Txheem: EN 10210-1 (S355J2H) rau cov ntu hollow kub ua tiav lossis cov profiles.
Rau Phaj: EN 10025-2 yog thawj.
Vuam Compatibility: Txawm tias ob qho tib si weld zoo, kev xaiv hlau muab tub lim yuav tsum ua raws li European system (xws li EN ISO 14341-A).
Cov lus pom zoo
Thaum tshawb nrhiav European sib npaug rau A572 Qib 50:
Rau cov qauv qauv thiab cov seem, qhia S355J2 (+N).
Rau cov ntawv thov uas yuav tsum tau txheeb xyuas qhov qis -kub toughness, qhia S355N lossis S355NL.
Nco ntsoov paub meej tias lub zog tawm los rau koj cov khoom tshwj xeeb tuab thiab sab laj EN tus qauv kom ntseeg tau tias txhua yam khoom uas yuav tsum tau ua (tshwj xeeb tshaj yog cuam tshuam toughness) tau ntsib.
Hauv cov ntsiab lus, qhov sib npaug ntawm qhov tseem ceeb tshaj plaws thiab feem ntau lees txais yog S355J2 (+N), nrog rau kev ua tib zoo saib xyuas cov qib -qib thiab thickness- nyob ntawm cov khoom muaj zog.
1. A572 Qib 50 steel siv rau dab tsi?
A572 Qib 50 feem ntau yog siv rau hauv cov khoom siv xws li lub tsev thav duab, txuas hniav, cov kav hlau txais xov, thiab cov khoom siv tsim kho uas muaj zog ntau dua li A36 steel xav tau.
2. Lub zog tawm ntawm A572 Qib 50 yog dab tsi?
Qhov tsawg kawg nkaus tawm lub zog ntawm A572 Qib 50 yog 50 ksi (345 MPa).
3. Qhov txawv ntawm A572 Qib 50 thiab A36 yog dab tsi?
Qhov sib txawv tseem ceeb yog lub zog: A572 Qib 50 muaj lub zog ntau dua (50 ksi vs . 36 ksi) thiab yog siab - lub zog qis- alloy (HSLA) hlau, thaum A36 yog cov pa roj carbon me me.
4. A572 Qib 50 puas tuaj yeem welded?
Yog lawm, nws muaj qhov zoo weldability siv ntau txoj hauv kev xws li shielded hlau arc vuam (SMAW) thiab roj hlau arc vuam (GMAW), txawm tias cov txheej txheem tsim nyog yuav tsum ua raws.
5. Cov tshuaj muaj pes tsawg leeg ntawm A572 Qib 50 yog dab tsi?
Nws feem ntau muaj cov ntsiab lus xws li carbon (max 0.23%), manganese (max 1.35%), phosphorus, sulfur, thiab tej zaum yuav suav nrog me me ntawm columbium, vanadium, lossis nitrogen rau ntxiv dag zog.
6. Puas yog A572 Qib 50 corrosion resistant?
Tsis yog, nws tsis yog corrosion- qib resistant. Rau sab nraum zoov lossis corrosive ib puag ncig, nws feem ntau yuav tsum muaj cov txheej txheem tiv thaiv xws li xim lossis galvanizing.
7. Cov ntawv A572 Qib 50 muaj dab tsi?
Nws yog dav muaj nyob rau hauv cov qauv duab (beams, channels, ces kaum), daim hlau, tuav, thiab nplooj ntawv.
8. Qhov sib npaug ntawm A572 Qib 50 hauv European qauv yog dab tsi?
Qhov sib npaug nyob sab Europe zoo tshaj plaws yog S355JR lossis S355J2 raws li EN 10025-2, txawm tias qhov sib npaug yog nyob ntawm qhov tuab thiab qhov yuav tsum tau muaj.
9. A572 Qib 50 piv rau A992 steel li cas?
A992 yog ib qho tshiab, nruj dua tswj cov qauv hlau feem ntau rau qhov dav - flange duab, nrog cov txiaj ntsig zoo sib xws (50-65 ksi) tab sis nruj dua tshuaj thiab cov khoom siv.
10. Tus nqi ntawm A572 Qib 50 piv rau A36 yog dab tsi?
A572 Qib 50 feem ntau raug nqi 10-25% ntau dua A36 vim nws lub zog siab dua thiab cov ntsiab lus alloy, tab sis cov nqi sib txawv nrog kev lag luam thiab kev txiav txim loj.
Tag nrho cov specification thiab cov ntsiab lus muaj nyob rau ntawm kev thov. Cov ntaub ntawv saum toj no yog muab rau kev taw qhia nkaus xwb. Rau kev tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom.
