ASTM A36 Cov kav dej

Tianjin Lefin Industrial Co., Ltd yog ib qho ntawm cov tuam ntxhab thiab cov muag khoom ntawm astm a36 kav dej hauv Suav teb. Thov koj xav tias dawb mus yuav zoo astm a36 kav los ntawm peb lub hoobkas. Kev pabcuam zoo thiab tus nqi tsim nyog muaj.

ASTM A36 yog cov qauv carbon steel qauv tsim los ntawm American Society for Testing and Materials (ASTM). Cov qauv siv tau tam sim no yog ASTM A36 / A36M-19 (qee cov ntaub ntawv hais tias yuav muaj kev hloov kho tshiab hauv 2024, tab sis cov no tsis tau lees paub dav dav los ntawm cov tub ceev xwm). Nws cov kev xav tau rau cov kav dej npog ntau qhov ntev xws li tshuaj lom neeg muaj pes tsawg leeg, cov khoom siv kho tshuab, qhov ntev ntev, thiab cov txheej txheem zoo, raws li hauv qab no:

1.Chemical muaj pes tsawg leeg yuav tsum tau
Cov tshuaj muaj pes tsawg leeg ntawm ASTM A36 cov kav dej yog nruab nrab ntawm cov pa roj carbon tsawg thiab tsis muaj impurities, kom ntseeg tau zoo weldability thiab plasticity. Cov kev txwv ntawm cov ntsiab lus tseem ceeb yog raws li nram no (raws li kev txheeb xyuas melting):

•  Cov pa roj carbon (C):Tsawg dua lossis sib npaug li 0.25% (thickness Tsawg dua lossis sib npaug li 20mm); tuaj yeem so mus rau 0.31% raws li lub thickness nce (thickness> 20mm). Cov pa roj carbon yog qhov tseem ceeb ntawm lub zog, tab sis cov nyiaj ntau dhau yuav txo qhov weldability.

•  Manganese (Mn):0.80 - 1.20%. Manganese tuaj yeem txhim kho lub zog thiab hardness, thaum tseem txhim kho weldability (tiv thaiv vuam tawg).

•  Phosphorus (P): Tsawg dua lossis sib npaug li 0.04%; Sulfur (S): Tsawg dua lossis sib npaug li 0.05%. Ob leeg yog teeb meem impurities. Lawv raug tswj nruj me ntsis kom txo cov kub brittleness (vim yog leej faj) thiab txias brittleness (vim phosphorus), ua kom cov vuam zoo.

• Silicon (Si): Tsawg dua lossis sib npaug li 0.40%. Raws li ib tug deoxidizer, nws txhim khu lub purity thiab mechanical zog ntawm cov hlau.

• Copper (Cu):Tsawg dua lossis sib npaug li 0.20% (cov ntsiab lus no tsuas yog xav tau thaum teev rau huab cua tiv thaiv). Tooj liab tuaj yeem txhim kho corrosion kuj me ntsis, tab sis nws tsis yog qhov yuav tsum tau ua.

2. Mechanical Performance Requirements

Cov cuab yeej siv tshuab yog cov txheej txheem lees paub rau ASTM A36 cov kav dej, ncaj qha ntsig txog cov khoom thauj -kev nyab xeeb thiab kev ntseeg siab ntawm cov khoom siv. Cov kev cai sib txawv nrog thickness (siv lub thickness tsawg dua los yog sib npaug rau 20mm raws li piv txwv): 

• Yield zog: Ntau tshaj lossis sib npaug ntawm 250 MPa (36 ksi, qhov chaw ntawm qib "36"). Rau cov thicknesses ntau dua 20mm, rau txhua txhua 25mm nce nyob rau hauv thickness, lub zog tawm los yuav raug txo los ntawm 10 MPa (tsawg kawg ntau tshaj los yog sib npaug rau 205 MPa).

• Tensile zog:400 - 550 MPa (58 - 80 ksi). Nws muaj ib tug tshwj xeeb lub zog cia, ua tau raws li qhov yuav tsum tau ntawm cov pa qauv.

• Elongation:Ntau dua lossis sib npaug li 20% (nrog rau qhov ntsuas qhov ntev ntawm 200mm); Thaum lub thickness yog ntau tshaj 50 hli, lub elongation yuav tau so kom ntau tshaj los yog sib npaug rau 18%. Elongation qhia txog plasticity thiab xyuas kom meej tias cov yeeb nkab tuaj yeem cuam tshuam cov yas deformation nyob rau hauv kev quab yuam yam tsis tas yuav tawg.

• Bending xeem:Lub bending center txoj kab uas hla yog 1.5 npaug ntawm cov qauv thickness. Cov qauv yog khoov los ntawm 180℃yam tsis muaj kab nrib pleb (qhov chaw khoov lub taub tuaj yeem nce ntxiv thaum lub thickness ntau dua 20mm). Qhov kev sim no txheeb xyuas qhov formability thiab tawg tsis kam ntawm cov yeeb nkab.

3. Qhov ntev thiab kev tsim khoom yuav tsum tau ua

• Dimension kam rau ua:Yuav tsum ua raws li ASTM A6 / A6M tus qauv (rau qhov ntev ntawm steel phaj / steel seem). Piv txwv li, lub thickness kam rau ua ntawm steel daim hlau yog ± 0.05 hli, qhov ntev / dav kam rau ua yog ± 5 hli; rau steel seem (xws li lub kaum sab xis steel, I-beam), lub ceg ntev ntev yog ± 3 hli, thiab flange thickness kam rau ua yog ± 10%.

• Txheej Txheem Zoo:Qhov saum npoo ntawm cov kav dej yuav tsum tsis muaj kab nrib pleb, xeb, pitting, thiab lwm yam.; Cov cim yuav tsum tau hais meej meej "ASTM A36, tus naj npawb ntawm cov khoom siv hluav taws xob, cov lej ua haujlwm, cov lus qhia tshwj xeeb", thiab ua raws li daim ntawv tshaj tawm zoo. Cov welded seams ntawm cov welded kav yuav tsum zoo ib yam thiab tsis muaj qhov hws, thiab ua tau raws li qhov yuav tsum tau ntawm tsis yog -kev kuaj kev puas tsuaj (xws li ultrasonic, radiographic kuaj).

Yog vim li cas vim li cas ASTM A36 cov kav dej tau dhau los ua cov qauv hlau thoob ntiaj teb yog vim lawv cov yam ntxwv ntawm "lub zog nruab nrab, kev ua haujlwm zoo heev, thiab tus nqi qis", raws li hauv qab no:

1. Lub zog yog nruab nrab thiab tuaj yeem ua tau raws li qhov xav tau ntawm cov qauv siv feem ntau.

Lub zog tawm los ntawm 250 MPa yog txaus kom ua tau raws li cov load-cov kev cai ntawm cov qauv qub xws li cov tsev, txuas hniav, thiab tshuab. Tsis tas yuav siv ntau dua - lub zog alloy steel (xws li A572 Qib 50), yog li txo cov nqi.

2. Weldability zoo heev, haum rau vuam cov qauv

Cov ntsiab lus carbon tsawg (tsawg dua los yog sib npaug li 0.25%) ua rau nws tsis tsim nyog rau preheat los yog siv cov khoom siv vuam tshwj xeeb thaum vuam (tshwj tsis yog nws tuab heev lossis nyob rau hauv qhov qis- qhov kub thiab txias). Ntau yam kev siv vuam xws li arc vuam thiab roj shielded vuam tuaj yeem siv tau. Nws yog ib qho ntawm feem ntau siv steels hauv vuam qauv.

3. Zoo formability, yooj yim rau txheej txheem
Cov yas zoo heev (elongation tus nqi Ntau dua lossis sib npaug li 20%) ua rau nws yooj yim rau kev siv tshuab xws li txiav, khoov, xuas nrig ntaus, thiab riveting, thiab nws yog qhov tsim nyog rau kev tsim ntau yam zoo li tus qauv (xws li cov khoom siv thav duab, hauv paus).

4. Tus nqi qis thiab tus nqi siab rau cov nyiaj

Cov muaj pes tsawg leeg yog qhov yooj yim (tsuas yog muaj cov pa roj carbon thiab manganese), cov txheej txheem ntau lawm yog cov paub tab, thiab tus nqi qis dua li cov hlau tsis muaj steel lossis siab -lub zog alloy steel, ua rau nws haum rau cov ntawv loj -.

5. Cov kev txwv

• Tsis haum rau qis -kub los yog cuam tshuam load ib puag ncig:Qhov cuam tshuam toughness ntawm A36 yog qhov tsawg. Nws yog feem ntau ua rau pob txha tawg nyob rau hauv qhov kub qis (-20℃lossis qis dua) lossis dynamic loads (xws li av qeeg, cuam tshuam), thiab cov hlau ntau dua (xws li A516 Gr.70) yuav tsum tau xaiv.
• Corrosion resistance yog nruab nrab:Tsis muaj cov ntsiab lus alloying (xws li chromium, nickel) ntxiv. Kev tiv thaiv corrosion yuav tsum tau txhim kho los ntawm cov txheej txheem xws li galvanization lossis pleev xim (rau siv rau sab nraum zoov).

Lub versatility ntawm ASTM A36 cov kav dej ua rau lawv tau dav siv hauv kev lag luam xws li kev tsim kho, txuas hniav, kev tsim khoom, thiab kev tsim tsheb. Nov yog qee qhov piv txwv tshwj xeeb ntawm kev siv:

1. Lub tsev tsim qauv

• Cov tsev thiab factories:Cov no yog siv rau cov khoom siv xws li steel thav duab, kab teeb thiab kab, platforms, staircases, thiab lub ru tsev txhawb nqa, thiab yog cov khoom tseem ceeb ntawm steel qauv vaj tsev (xws li steel ncej ntawm siab - nce chaw ua haujlwm tsev).
• Public chaw:Xws li cov qauv ru tsev ntawm tshav dav hlau terminals thiab cov chaw ua si kis las, ua kom zoo dua ntawm lawv cov rigidity siab thiab weldability.

2. Kev tsim kho choj

• Cov txheej txheem thib ob: xws li kev tiv thaiv ntawm cov choj, cov kab hluav taws xob txhawb nqa, thiab cov khoom sib txuas ntawm cov piers choj, tsis yog cov khoom loj -cov kabmob loj (lub ntsiab load-cov kabmob yuav tsum yog siab dua- lub zog A572 Qib 50 cov khoom).

3. Mechanical Manufacturing
• Cov khoom siv thiab lub hauv paus: Piv txwv li, lub hauv paus ntawm kev txhaj tshuaj molding tshuab lossis compressor, ua kom zoo dua ntawm nws cov kev co zoo heev thiab weldability.
• Cov cuab yeej tiv thaiv: Xws li cov tshuab tiv thaiv thiab cov thaiv kev nyab xeeb, siv kom zoo dua ntawm lawv cov qauv thiab tus nqi- ua tau zoo.

4. Kev tsim tsheb
• Truck chassis thiab crane boom: Siv rau kev tsim cov chassis thav duab ntawm cov tsheb thauj khoom thiab cov qauv boom ntawm cranes, ua kom zoo dua lawv lub zog siab - rau - hnyav piv.

5. Cov khoom siv dav dav
• Bolts, ceev, gaskets: Nyob rau hauv daim ntawv ntawm bar Tshuag, A36 yog siv los tsim ntau yam fasteners, coj kom zoo dua ntawm nws zoo heev machinability thiab nqi -effectiveness.

ASTM A36 cov kav dej yog cov khoom siv hluav taws xob thoob ntiaj teb. Cov ntsiab lus tseem ceeb yog "cov tshuaj lom neeg ruaj khov, ua tau raws li cov qauv kev ua tau zoo, thiab ua tau raws li qhov yuav tsum tau muaj qhov tseeb".

Cov yam ntxwv tseem ceeb yog "lub zog nruab nrab, zoo weldability, thiab tus nqi qis". Cov kev siv feem ntau suav nrog kev tsim kho, txuas hniav, kev tsim kho tshuab, thiab lwm yam. Nws yog cov khoom siv zoo tshaj plaws rau cov khoom siv sib xyaw ua ke.

Txawm li cas los xij, nws yuav tsum tau muab sau tseg tias nws tsis haum rau qhov qis - qhov kub thiab txias, cuam tshuam cov loads, lossis siab - ib puag ncig corrosion. Hauv cov xwm txheej zoo li no, ntau dua - cov hlau ua tau zoo (xws li A572 thiab 304 stainless hlau) yuav tsum tau xaiv.