Cov ntsiab lus ntawm Q690E yog dab tsi

Q690E sawv tawm raws li tus qauv ntsuas rau kev ua tau zoo thiab kev ntseeg tau, seamlessly blending ultra-siab zog, tshwj xeeb qis- kub toughness, thiab robust processability. Raws li tus nqi siab siab -lub zog qis- alloy (HSLA) steel ua rawsGB/T 1591-2018, nws tau dhau los ua cov khoom ntawm kev xaiv rau kev tsim kho tseem ceeb thiab kev tsim kho siab heev, tsav kev tsim kho tshiab thoob plaws hauv lub zog, tshuab, thiab marine sectors.is qib hwm qib siab - zog qis- alloy (HSLA) cov qauv hlau ua raws li Suav teb cov qauv, feem ntauGB/T 1591-2018thiabGB/T 16270-2009. Renowned rau nws qhov tshwj xeeb lub zog- sib npaug toughness, weldability zoo heev, thiab superior qis- qhov kub thiab txias kev ua tau zoo, nws yog ib qho tseem ceeb ntawm cov khoom siv rau hnyav- cov ntawv thov engineering hauv huab cua.

Cov nomenclature ntawm Q690E encapsulates nws cov yam ntxwv kev txawj ntse nrog zoo kawg li clarity:

• "Q": Muab los ntawm Suav lo lus rau "yield zog," anchoring nws cov kev faib nyob rau hauv load- bearing muaj peev xwm.
• "690": Qhia txog qhov tsawg kawg nkaus lub zog ntawm 690 MPa rau daim hlau Tsawg dua los yog sib npaug rau 16 hli tuab - tus nqi uas tswj kev ua tau zoo txawm tias nyob hauv cov ntu tuab (Ntau dua lossis sib npaug rau 650 MPa rau 50＜t Tsawg dua lossis sib npaug li 100mm).
• "E": Sawv cev rau qib siab zoo tshaj plaws rau qis- kev pabcuam kub, xav tau-40℃Charpy V-notch cuam tshuam lub zog ntawm Ntau dua lossis sib npaug rau 27 J(nrog qhov tiag- ntiaj teb engineering qhov tseem ceeb feem ntau tshaj 47 J). Qhov kev sib txawv no ua rau nws muaj zog ntau dua li cov qib qis xws li Q690D (-20℃yuav tsum tau) hauv cov xwm txheej txias.

Qhov tseem ceeb, Tuam Tshoj tus GB / T 1591-2018 tus qauv rau Q690E tau ua tiav nrog cov qauv ntsuas thoob ntiaj teb xws li Europe's EN 10025-6 thiab Asmeskas's ASTM A514, txawm hais tias kev siv zog txuas ntxiv txhawm rau txhawm rau txheeb xyuas cov xwm txheej huab cua zoo li polar engineering.

Q690E qhov kev ua tau zoo yog los ntawm kev tsim kho tshuaj lom neeg muaj pes tsawg leeg thiab microstructure, ntsuas lub zog, toughness, thiab ua haujlwm tau zoo.

Precision Chemical Formulation

Cov hlau ua haujlwm qis- carbon, microalloyed tsim kom tsis txhob muaj qhov cuam tshuam ntawm kev tawg thiab vuam rhiab heev:

• Cov ntsiab lus tseem ceeb: Cov ntsiab lus carbon yog capped ntawm 0.18% (thiab qis li 0.12% hauv qee qhov sib txawv) txhawm rau txhim kho weldability, thaum manganese (tsawg dua lossis sib npaug li 2.00%) txhawb nqa hardenability. Chromium thiab npib tsib xee raug ntxiv los ua kom zoo dua - qhov kub thiab txias.
• Microalloy khawv koob: Niobium (Nb), vanadium (V), thiab titanium (Ti) tsav grain refinement thiab nag lossis daus muaj zog, tsim kom muaj microstructure uas tiv thaiv deformation nyob rau hauv hnyav loads.
• Purity tswj: Kev phom sij phosphorus (P Tsawg dua lossis sib npaug li 0.025%) thiab sulfur (S Tsawg dua lossis sib npaug rau 0.020%, qee zaum Tsawg dua lossis sib npaug rau 0.010% hauv cov khoom hwm hwm) raug txwv nruj kom tshem tawm cov kev pheej hmoo embrittlement.
• Weld- tus phooj ywg tsim: Cov pa roj carbon sib npaug (Ceq) nyob qis dua 0.47% (thiab feem ntau Tsawg dua los yog sib npaug li 0.45%), txo qis qhov txias txias thaum lub sij hawm vuam.

Mechanical Performance Metrics

Thoob plaws thicknesses, Q690E tuav ib tug formidable tshuav nyiaj li cas ntawm lub zog thiab ductility:

• Tensile zog: 770–940 MPa rau nyias - mus rau - ntu nruab nrab, kom nws ua tau zoo dua cov pa hlau xws li Q355B los ntawm ntau dua 100% hauv lub peev xwm thauj khoom.
• Ductility: Elongation ntawm Ntau dua lossis sib npaug li 14% (Ntau dua lossis sib npaug li 12% rau 12mm + daim hlau) tiv thaiv kev puas tsuaj loj hauv kev ntxhov siab.

Manufacturing Q690E xav tau kev tswj xyuas qhov tseeb thoob plaws txhua theem, nrog cov neeg tsim khoom zoo li Baosteel thiab Tianjin Yeeb Nkab pioneering cov txuj ci siab tshaj:

1. Smelting & Purification

Cov txheej txheem pib nrog "converter smelting + LF refining + VD nqus tsev vacuum" triple kev kho mob, stripping impurities thiab kom ntseeg tau tias uniform alloy tis. Cov kauj ruam hauv paus no lav cov khoom siv lub hauv paus purity thiab kev ua tau zoo sib xws.

2. Rolling & Kev kho cua sov

Ob txoj hauv kev tseem ceeb ntawm kev txiav Q690E rau daim ntawv thov xav tau:

• Thermo-Mechanical Control Process (TMCP): Rau feem ntau cov khoom nruab nrab- tuab, tswj dov ntawm 850 ± 20℃ua raws li kev ua kom txias txias (15-25℃/ s) tsim ib qho zoo -grained ferrite-bainite qauv. Txoj kev no txo ​​cov pa roj carbon monoxide los ntawm 20% piv rau kev kho cua sov ib txwm thiab txo cov nqi los ntawm 10-15%.
• Quenching & Tempering (Q&T): Thick plates (>50mm) thiab siab -cov raj muaj qhov ua tau zoo ntawm 880-950℃thiab tempering ntawm 550-650 degree, tsim tawv 回火索氏体. Cov txheej txheem no thawb qis - qhov kub thiab txias ua haujlwm rau qhov siab tshiab - qee cov khoom ua tiav 35J + cuam tshuam lub zog ntawm -60℃.

3. Precision Finishing & Tshuaj xyuas

Niaj hnub nimno mills siv peb - yob txwv mandrel dov (MPM) rau seamless hlab, ua tiav ± 0.5% sab nraud txoj kab uas hla thiab ± 5% phab ntsa thickness kam rau ua. Kev tswj kom zoo yog tag nrho:

100% kev kuaj ultrasonic online (UT) rau qhov tsis xws luag.

Batch-kev ntsuas kev txawj ntse (tensile, impact, dabtsi yog khoov).

TOFD diffraction kuaj rau welds, nrog 99% kev kuaj pom tus nqi.

Thib peb- ntawv pov thawj rau cov ntawv thov tseem ceeb (xws li API rau lub zog, CCS rau marine).

Hu rau tam sim no

Cov qauv tshuaj ntsuam xyuas zoo li cas yuav tsum Q690E steel dhau ua ntej tawm hauv lub hoobkas?

Q690E steel tau dhau los ua ntau yam- kev tshuaj xyuas yam khoom raws li GB/T 1591-2018 thiab cov qauv kev lag luam cuam tshuam. Ua ntej,tshuaj muaj pes tsawg leeg tsom xamtxhawm rau txheeb xyuas cov ntsiab lus ntawm carbon, manganese, microalloying cov ntsiab lus, thiab cov khoom tsis zoo (phosphorus Tsawg dua lossis sib npaug li 0.025%, sulfur Tsawg dua lossis sib npaug li 0.020%). Thib ob,mechanical khoom kuaj, suav nrog kev sim tensile, -40℃Charpy V-notch kev ntsuam xyuas qhov cuam tshuam (kev cuam tshuam lub zog loj dua lossis sib npaug rau 27J), thiab kev ntsuas txias txias. Peb,tsis yog -kev kuaj kev puas tsuaj: Kev kuaj ultrasonic (UT) rau qhov tsis xws luag sab hauv, sib nqus particle kuaj (MT) los yog kev ntsuam xyuas penetrant (PT) rau qhov tsis xws luag, tshwj xeeb tshaj yog rau cov khoom siv hauv engineering tseem ceeb. Thaum kawg, qhov tseeb qhov tseeb thiab qhov zoo ntawm qhov chaw kuaj xyuas kom ua tau raws li cov neeg siv khoom xav tau.

Cov kev txwv tseem ceeb ntawm Q690E steel yog dab tsi, thiab nyob rau hauv cov xwm txheej twg nws tsis pom zoo siv?

Cov kev txwv tseem ceeb ntawm Q690E yog nwstus nqi ntau lawmpiv rau cov qauv hlau zoo tib yam, thiab cov kev cai nruj heev rau kev ua thiab vuam cov txheej txheem, uas yuav ua rau kom cov nqi tsim kho. Nws tsis pom zoo siv rau hauv ob hom xwm txheej: ua ntej, qis-load, ambient- cov haujlwm kub uas tsis muaj zog txaus- siv Q690E yuav ua rau cov nqi pov tseg, thiab cov hlau zoo li Q355B tuaj yeem ua tau raws li qhov xav tau; Thib ob, ib puag ncig nrog ultra- kub kub (＞ 300 degree) rau lub sijhawm ntev, vim nws lub zog yuav poob qis heev ntawm qhov kub thiab txias, thiab cov cua sov- cov qib steel resistant yuav tsum tau xaiv.