ASTM A709 Qib 50yog tus qauv rau siab- lub zog steel siv feem ntau hauv kev tsim choj, paub txog nws lub zog zoo - rau - qhov hnyav piv, weldability, thiab durability, nrog rau cov kev xaiv xws li 50W muab kev txhim kho atmospheric corrosion kuj, ua rau nws haum rau ntau yam sab nraum zoov infrastructure project. Nws cov yam ntxwv tseem ceeb yog qhov tsawg kawg nkaus tawm lub zog ntawm 50 ksi (345 MPa), nrog rau kev hloov pauv (xws li HPS 50W) muab kev txhim kho toughness thiab weathering zog rau kev thov.
Cov yam ntxwv tseem ceeb
Daim ntawv thov:Cov choj, cov tsev, siab- cov qauv nce, cov roj rigs, thiab cua ua liaj ua teb.
Corrosion Resistance:Qhov "W" hauv qib zoo li 50W qhia txog huab cua muaj peev xwm, tsim kev tiv thaiv patina.
Txheem:ASTM A709 yog cov lus qhia tshwj xeeb rau cov qauv hlau hauv txuas hniav, npog carbon, HSLA (High Strength Low Alloy), thiab quenched & tempered steels.
Lub zog:
Yam tsawg kawg nkaus lub zog ntawm 50 ksi (345 MPa)
ASTM A709 Qib 50 yog dab tsi?
Qhov tsawg kawg nkaus yield zog ntawm ASTM A709 Qib 50 yog 50 ksi (345 MPa) rau structural duab thiab daim hlau nrog ib tug siab tshaj plaws thickness ntawm 4 nti (100 mm).
Rau cov ntaub ntawv tuab, qhov kev qhia tawm lub zog txo qis raws li hauv qab no raws li ASTM A709 / A709M tus qauv:
| Khoom Thickness / Loj | Yam tsawg kawg nkaus Yield Strength (0.2% Offset) |
|---|---|
| Txog li 4.0 nti (100mm) | 50 ksi (345 MPa) |
| 4.0-5.0 hli (100-125mm) | 46 ksi (315 MPa) |
| 5.0-8.0 hli (125-200mm) | 42 ksi (290 MPa) |
Cov ntsiab lus tseem ceeb rau A709 Qib 50:
Choj-Specific Standard: A709 Qib 50 tsis yog qib khoom siv xwb; Nws yog tus qauv qauv hlau rau kev tsim choj hauv Teb Chaws Asmeskas, tswj hwm los ntawm ASTM thiab AASHTO M 270 (tus choj kev tsim kho).
Qhov tseem ceeb ntawm A572 Qib 50: Txawm hais tias ob qho tib si muaj qhov sib txawv ntawm lub zog, A709 Qib 50 suav nrog qhov yuav tsum tau ua kom muaj zog (qhov cuam tshuam) kev ntsuas raws li tus choj qhov chaw kub qhov chaw (Zone 1, 2, lossis 3). Qhov no ua rau nws siab dua -kev cia siab, choj- ntawv pov thawj version ntawm 50 ksi steel.
Tensile Strength: Qhov tsawg kawg nkaus tensile lub zog yog 65 ksi (450 MPa).
Daim Ntawv Ceeb Toom: Txoj cai 4-nti tuab yog qhov tseem ceeb. Rau cov qauv choj girders thiab cov khoom siv (feem ntau hauv qab 4 "tuab), 50 ksi yield zog siv. Cov kws ua haujlwm yuav tsum tau txheeb xyuas lub zog raws li cov khoom tuab.
Hauv cov ntsiab lus, rau feem ntau ntawm cov ntawv siv choj siv cov khoom siv tsawg dua lossis sib npaug li 4 ntiv tes tuab, ASTM A709 Qib 50 muaj qhov tsawg kawg nkaus tawm lub zog ntawm 50 ksi (345 MPa), ua ke nrog qhov yuav tsum tau ua kom tawg toughness ntawv pov thawj rau kev nyab xeeb ntawm cov qauv.
Tshuaj muaj pes tsawg leeg
(Kev ntsuas kub, wt. %, qhov siab tshaj plaws tshwj tsis yog sau tseg)
| Tshuaj muaj pes tsawg leeg | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Hom | C (1)(max wt%) | Mn(1) (%) | P (max wt%) | S (max wt%) | Si (wt%) | Cu(2)(min wt%) | V (wt%) | Cb (wt%) | V + Nb (wt%) |
| 1 | 0.23 | 1.35 | 0.030 | 0.030 | 0.40 | 0.20 | --- | 0.005 - 0.05 | --- |
| 2 | 0.23 | 1.35 | 0.030 | 0.030 | 0.40 | 0.20 | 0.01 - 0.15 | --- | --- |
| 3 | 0.23 | 1.35 | 0.030 | 0.030 | 0.15 - 0.40 | 0.20 | 0.01 - 0.15 | 0.005 - 0.05 | 0.02 - 0.15 |
Impact Properties
| Impact Properties | ||||||
|---|---|---|---|---|---|---|
| Qib | Thickness (hauv) | Min Longitudinal Nruab Nrab Zog(1) (ft{0}}lbs) |
Min Longitudinal Tus kheej tus nqi (ft{0}}lbs) |
Zone 1 Test Temp | Zone 2 Test Temp | Zone 3 Test Temp |
| 50T | 0.1875 - 2.00 | 15 | 10 | 70℃F | 40℃F | 10℃F |
| 50T | 2.01 - 3.00 | 20 | 15 | 70℃F | 40℃F | 10℃F |
| 50F | 0.1875 - 2.00 | 25 | 20 | 70℃F | 40℃F | 10℃F |
| 50F | 2.01 - 3.00 | 30 | 24 | 70℃F | 40℃F | 10℃F |
1. ASTM A709 Qib 50 steel siv rau dab tsi?
Nws yog feem ntau siv rau kev tsim kho choj, suav nrog girders, trusses, thiab lwm yam khoom siv, vim nws lub zog siab thiab weldability yuav tsum tau nyob rau hauv txoj kev loj thiab railway choj.
2. Lub zog ntawm ASTM A709 Qib 50 yog dab tsi?
Qhov tsawg kawg nkaus yield zog ntawm A709 Qib 50 yog 50 ksi (345 MPa) rau cov khoom thicknesses txog li 4 ntiv tes (100 hli).
3. Qhov txawv ntawm A709 Qib 50 thiab A572 Qib 50 yog dab tsi?
A709 Qib 50 tshwj xeeb yog tsim thiab sim ua kom tau raws li kev tsim kho choj (nrog rau cov qauv tawv thiab vuam), thaum A572 Qib 50 yog cov qauv hlau dav dav yam tsis tas yuav tsum txuas ntxiv no - cov ntawv pov thawj tshwj xeeb.
4. Puas yog ASTM A709 Qib 50 weldable?
Yog lawm, nws yog tsim los rau weldable raws li nruj choj welding codes (xws li AWS D1.5), tab sis yuav tsum tau cov txheej txheem tsim nyog thiab feem ntau siv tsawg -hydrogen kev coj ua thiab tshwj xeeb muab tub lim hlau.
5. Dab tsi yog qhov cuam tshuam toughness rau A709 Qib 50?
Nws yuav tsum tau Charpy V- ntsuas qhov cuam tshuam, feem ntau ntawm 40 ft-lb (54 J) ntawm 70℃F (21 degree) lossis qis dua nyob ntawm qhov kev pabcuam (xws li Zone 1, 2, lossis 3).
6. Cov European sib npaug ntawm ASTM A709 Qib 50 yog dab tsi?
Qhov sib npaug nyob sab Europe zoo tshaj plaws yog S355 series steel (xws li S355J2 lossis S355K2) raws li EN 10025-2, tab sis nws tsis suav nrog tib cov ntawv pov thawj tshwj xeeb raws li A709.
7. ASTM A709 Qib 50 puas tuaj yeem siv rau hauv cov tsev?
Yog lawm, nws tuaj yeem siv tau, tab sis feem ntau nws kim dua vim nws tus choj - kev ntsuas qib thiab ntawv pov thawj, yog li A572 Qib 50 lossis A992 muaj ntau dua rau kev tsim vaj tsev.
8. Cov tshuaj muaj pes tsawg leeg ntawm ASTM A709 Qib 50 yog dab tsi?
Nws yog siab- zog qis- alloy (HSLA) hlau nrog txwv ntawm carbon, manganese, phosphorus, sulfur, thiab micro- alloys xws li vanadium lossis niobium rau lub zog thiab tawv.
9. Cov qib sib txawv ntawm ASTM A709 yog dab tsi?
ASTM A709 suav nrog ntau qib: 36, 50, 50W, 70, 70W, 100, thiab 100W, qhov "W" qhia txog huab cua hloov pauv nrog corrosion kuj.
10. A709 Qib 50 piv rau A709 Qib 50W li cas?
Qib 50 yog cov qauv hlau uas xav tau cov txheej txheem tiv thaiv corrosion, thaum Qib 50W yog cov hlau tsis zoo uas tsim cov patina tiv thaiv thiab siv tsis tau pleev xim rau hauv qhov chaw tsim nyog.
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.
