Nyob rau hauv kev lag luam uas xav tau heev xav tau rau steel phaj kev ua tau zoo, xws li petrochemicals thiab boiler manufacturing,ASTM A516 GR 70 steel phajyog cov khoom siv dav siv. Raws li cov pa roj carbon steel phaj tshwj xeeb tsim los rau qis- rau- nruab nrab kub siab cov hlab ntsha raws li Asmeskas cov qauv, nws tswj kev ua haujlwm ruaj khov nyob rau hauv siab - siab thiab qis - qhov kub thiab txias. Yog vim li cas rau cov khoom no nyob rau hauv nws precisely balanced tshuaj muaj pes tsawg leeg. Ntau tus neeg muas zaub nug thaum lub sij hawm yuav khoom: "Yuav ua li cas yog lub ntsiab lus ntawm ASTM A516 GR 70? Vim li cas nws thiaj haum rau ntau qhov kev xav tau?" Yuxin Steel txheeb xyuas cov tshuaj muaj pes tsawg leeg ntawm qib no los pab koj nkag siab zoo dua cov khoom thiab xaiv cov phaj hlau tsim nyog rau koj qhov project.
Kev sib xyaw ntawm ASTM A516 GR 70 steel phaj nruj me ntsis ua raws li Asmeskas tus qauv ASTM / A516M. Nws cov yam ntxwv tseem ceeb yog: feem ntau cov ntsiab lus tsis tshua muaj carbon, kev tswj xyuas meej ntawm impurities, thiab rationally ntxiv alloying ntsiab. Qhov no ua kom muaj zog thaum tswj kev ua tau zoo.
Cov khoom xyaw tseem ceeb
Cov pa roj carbon (C)
Cov pa roj carbon (C) yog cov ntsiab lus tseem ceeb tshaj plaws, nrog cov ntsiab lus tsawg dua lossis sib npaug li 0.27%. Cov pa roj carbon ua haujlwm zoo li rebar hauv kev tsim kho- qhov tsim nyog ua rau cov hlau phaj muaj zog thiab txhim kho tensile lub zog. Qhov no tseem yog qhov tseem ceeb rau ASTM A516 GR 70 ua tiav lub zog tensile ntawm 485-620 MPa. Puas yog carbon ntau dua txhais tau tias zoo dua? Tsis tas li.
Cov ntsiab lus carbon ntau dhau ua rau cov phaj hlau nkig thiab nruj, ua rau lawv yooj yim tawg thaum vuam thiab tsis tsim nyog rau kev siv lub nkoj siab. Hloov pauv, cov pa roj carbon tsawg dhau ua rau lub zog tsis txaus los tiv thaiv siab - cov xwm txheej siab. Yog li, cov ntsiab lus carbon qis dua 0.27% sawv cev rau qhov zoo tshaj plaws tshuav nyiaj li cas.
Manganese (Mn)
Manganese (Mn) yog qhov thib ob tseem ceeb tshaj plaws tom qab carbon, nrog rau cov ntsiab lus ntawm 0.85%-1.20%. Nws lub luag haujlwm tseem ceeb yog txhawm rau txhawm rau txhawm rau lub zog tsis txaus los ntawm cov ntsiab lus carbon tsawg thaum txhim kho cov phaj steel qhov toughness thiab cuam tshuam tsis kam. Nws refines lub sab hauv grain qauv ntawm steel phaj, tiv thaiv nkig puas txawm nyob rau hauv qis-kub ib puag ncig.
ASTM A516 GR 70 feem ntau yog siv rau hauv cov hlab ntsha siab ua haujlwm ntawm -29℃lossis qis dua, xws li cov roj liquefied cia tank thiab cryogenic separators. Kev koom ua ke nrog cov hlau nplaum uas muaj manganese rau hauv cov hlab ntsha no tiv thaiv kev puas tsuaj ntawm qhov kub thiab txias, ua kom muaj kev nyab xeeb ntawm kev ua haujlwm. Tsis tas li ntawd, manganese txhim kho cov phaj hlau ua haujlwm tau yooj yim, ua kom yooj yim rau kev txiav thiab khoov kom tau raws li kev tsim khoom sib txawv rau cov khoom siv sib txawv.
Silicon (Si)
Silicon (Si) cov ntsiab lus nyob nruab nrab ntawm 0.15% thiab 0.40%. Ntxiv silicon thaum lub sij hawm steelmaking zoo tshem tawm cov pa oxygen los ntawm cov hlau molten, txo cov porosity thiab impurities thaum txhim kho lub phaj purity thiab ntom. Qhov no yog ib qho tseem ceeb uas ua rau cov hlau phaj tuaj yeem tiv taus kev kub siab thiab tiv thaiv cov dej xau. Tsis tas li ntawd, silicon pab txhim kho lub phaj lub zog thiab hardness. Thaum ua ke nrog manganese thiab carbon, nws ntxiv optimizes lub phaj tag nrho cov neeg kho tshuab zog. Qhov kev tsim no ua rau cov phaj hlau tuaj yeem tiv taus siab thaum ua raws cov txheej txheem kev ua haujlwm nyuaj, tiv thaiv kev ua haujlwm tsis zoo los ntawm cov impurities ntau dhau.
Phosphorus (P) thiab Sulfur (S)
Phosphorus (P) thiab sulfur (S) yog teeb meem impurities, thiab A516 GR 70 nruj me ntsis tswj cov ntsiab lus ntawm ob lub ntsiab. Cov ntsiab lus phosphorus ntau dhau tuaj yeem ua rau "txias brittleness" nyob rau hauv steel daim hlau, ua rau lawv muaj kev puas tsuaj tam sim ntawd yam tsis muaj kev ceeb toom nyob rau hauv qis - qhov kub thiab txias. Cov ntsiab lus sulfur ntau dhau ua rau "kub brittleness," ua rau cov hlau ua rau tawg thaum lub sij hawm vuam los yog kev kho cua sov, ua rau nws lub neej kev pab cuam thiab kev nyab xeeb. Yog li ntawd, phosphorus thiab sulfur cov ntsiab lus ua haujlwm tseem ceeb qhia qhov txawv ntawm qib siab - zoo steel daim hlau los ntawm cov tsis zoo.
Cov ntsiab lus
Thaum kawg, muaj ib qho tseem ceeb tshaj qhov ntsuas -carbon sib npaug (CEV), uas yuav tsum tsawg dua lossis sib npaug li 0.45%. Cov pa roj carbon sib npaug ua haujlwm tseem ceeb rau kev ntsuas steel phaj weldability, qhia meej txog qhov cuam tshuam ntawm ntau yam ntawm weldability. A CEV tsawg dua lossis sib npaug li 0.45% qhia tias ASTM A516 GR 70 muaj qhov zoo tshaj plaws weldability, ua rau siab -welds zoo yam tsis muaj txheej txheem preheating.
Hauv cov ntsiab lus, qhov muaj pes tsawg leeg ntawm A516 GR 70 yog tsim los ua kom tau raws li qhov xav tau ntawm qhov nruab nrab - mus rau - qhov kub thiab txias siab - cov ntawv thov siab thaum xa cov machinability zoo thiab weldability. Qhov kev sib npaug ntawm cov tshuaj lom neeg no ua rau nws cov khoom xaiv rau petrochemical, nuclear fais fab, boiler, thiab lwm yam lag luam, tiv thaiv kev lag luam kev ruaj ntseg thiab ruaj khov.
Yog tias koj muaj lus nug txog qhov muaj pes tsawg leeg lossis cov khoom ntawm ASTM A516 GR 70 steel daim hlau thaum lub sijhawm yuav khoom, lossis xav tau kev pabcuam hauv kev xaiv cov qauv tsim nyog rau koj cov haujlwm tshwj xeeb, thov hu rau peb. Peb pab neeg tshaj lij yuav muab cov kev daws teeb meem rau koj tus kheej, kom ntseeg tau tias koj cov txheej txheem yuav khoom muaj kev txhawj xeeb-dawb thiab koj qhov kev siv tsis muaj kev txhawj xeeb- dawb.
