Q345R steel phaj

 

Q345R yog qib qis- alloy siab- lub zog steel phaj tau teev tseg los ntawm Suav teb cov qauv, tsim tshwj xeeb rau kev siv lub nkoj siab."Q"stands rau yield zog,"345"qhia tias qhov tsawg kawg nkaus tawm lub zog ntawm 345 MPa, thiab"R"sawv rau"nkoj". Nws yog Suav sib npaug ntawm cov qib thoob ntiaj teb xws li ASTM A516 Qib 70 thiab EN 10028 P355GH, tab sis muaj qhov zoo ntawm cov khoom siv hauv zos thiab ua raws li GB 713-2014, uas tuaj yeem txhim kho cov txheej txheem kev yuav khoom rau cov haujlwm hauv Suav teb.

 

 

Rau kev ua haujlwm hnyav, qib tshwj xeeb derivative ntawm Q345R tuaj yeem raug xaiv. Kev lag luam tsis ntev los no tau ua tiav hauv kev tsim Q345R (R-HIC) hydrogen embrittlement- cov ntawv hlau tiv taus, tshwj xeeb tsim los tiv thaiv hydrogen embrittlement hauv ib puag ncig uas muaj cov dej ntub dej hydrogen sulfide (H₂S).

 

Cov hlau phaj no, muaj nyob rau hauv thicknesses txog li 195 hli, tau siv nyob rau hauv loj -tej petrochemical tej yaam num, qhia lawv kev ntseeg nyob rau hauv siab - siab, hydrogen- nplua nuj tej yam kev mob. Yog tias koj qhov project cuam tshuam nrog cov kev ua haujlwm zoo li no, qhia txog qib R-HIC yuav ua kom muaj kev nyab xeeb thiab ruaj khov ntawm koj cov khoom siv.

 

 

Txuj	Qib	Qhov txawv tseem ceeb
ASTM	A516 Gr . 70	A516 Gr. 70 tau qis me ntsis Mn (0.85–1.20%)
ASTM	A537 Cl . 1	A537 xav tau QT; Q345R normalized txaus
EN	P355GH	P355GH qhia txog qhov kub thiab txias pov thawj
JIS	SB 410 / SB 480 M	SB410 (225 MPa tawm los) tsis hloov pauv
ASME	SA-516 Gr . 70	Yuav tsum tau ASME cov ntaub ntawv pov thawj; Q345R ib leeg tsis txaus

  

 

1. Q345R steel phaj muaj siab hardenability thiab siab tshaj hardenability txoj kab uas hla yog ntau tshaj 30mm.

 

2. Lub zog thiab tawm dag zog ntawm Q345R steel phaj yog ntau dua li ntawm cov hlau alloy steel phaj.

 

3. Cov phaj hlau no muaj kev ruaj ntseg zoo heev thiab muaj zog toughness.

 

 

 

Normalized (N) thiab TMCP: Thermomechanically Controlled Process (TMCP) steel daim hlau muab cov khoom sib npaug ntawm cov pa roj carbon tsawg dua, txhim kho weldability, thiab txo qhov xav tau tom qab-weld heat treatment (PWHT). Rau cov nkoj uas raug raws li ASME Code, Volume 8, Part 1, lossis EN 13445, Suav tuam txhab lag luam tau xaiv ntau dua rau TMCP Q345R kom tsis txhob xa tawm -weld stress relief treatment.

 

Quenched thiab Tempered (QT): Rau ultra- ntu tuab (150 mm+) nyob rau hauv siab - kev pab cuam hydrogen siab los yog tuab- cov ntawv siv lub tshuab hluav taws xob, QT xa tuaj yeem ua kom tag nrho - thickness toughness thiab cov khoom sib xws. QT steel daim hlau hais kom tus nqi 20-30% tshaj li cov khoom siv ib txwm muaj.

 

1. Kev lag luam Petrochemical
Reactors, heat exchangers, separators: Siv nyob rau hauv cov txheej txheem xws li roj av refining thiab thee tshuaj nroj tsuag
Spherical tanks, roj thiab roj tso tsheb hlau luam, liquefied gas tanks: tshwj xeeb, spherical cia tso tsheb hlau luam nrog lub peev xwm tshaj 50 cubic meters
Liquefied petroleum gas (LPG) cylinders: LPG cia khoom siv rau hauv tsev thiab kev lag luam
Ntauwd- hom nkoj: Ntau hom tshuaj tiv thaiv, xws li cov kab sib xyaw thiab cov khoom nqus

2. Kev lag luam fais fab thiab boiler
Boiler drums: Core siab-cov kabmob ntawm cov khoom lag luam thiab lub zog cog boilers
Kev lag luam thiab thaj chaw boilers: Nruab nrab- kub (hauv qab 350 degree) siab - cov khoom siv boiler
Nuclear zog sector: Nuclear cov khoom siv xws li nuclear reactor siab hlab ntsha

3. Zog, Cia, thiab Thauj Khoom
Liquefied Natural Gas (LNG) cia tanks: Daim ntawv thov rau cov hlab ntsha cryogenic
Siab - cov kav dej siab thiab cov turbine volutes rau hydroelectric fais fab nroj tsuag: Cov khoom tseem ceeb ntawm hydroelectric tej yaam num
Cov Khoom Siv Roj Cia: Ntau hom roj cia tank thiab cov tsheb thauj khoom

4. Kev ua haujlwm tshwj xeeb
Hydrogen-Induced Cracking (HIC) Ib puag ncig: Q345R (R-HIC) yog tsim tshwj xeeb rau ib puag ncig nrog ntub hydrogen sulfide (H₂S) thiab acidic media, thiab tsim nyog rau cov chaw xws li siab -sulfur crude oil processing thiab natural gas purification plant
Cryogenic Pressure Vessels: Ua tau raws li qis- qhov kub thiab txias yuav tsum muaj qhov hnyav ntawm -20 degree, tsim nyog rau kev cia khoom thiab thauj khoom hauv cheeb tsam txias

 

 

Feem ntau, thaum xaiv cov khoom siv raw steel daim hlau rau cov tso tsheb hlau luam, boilers, thiab cov hlab ntsha siab, ASTM A516 steel phaj yog nrov. Txawm li cas los xij, Q345R steel phaj yog ntau txoj hauv kev xaiv zoo dua. Kawm paub ntau ntxiv txog kev sib piv ntawm Q345R thiab ASTM A516, thov hu rau peb cov kws tshaj lij.