S960Q(Yield ntau dua los yog sib npaug rau 960 MPa) occupies ib tug tshwj xeeb metallurgical niche, thawb cov ciam teb ntawm dab tsi yog kev lag luam siv tau rau quenched thiab tempered structural steel. Nws cov tshuaj muaj pes tsawg leeg yog ua tib zoo orchestrated compromise, tsim kom ua tau ib tug nyob ze - trinity tsis yooj yim sua: Extreme Strength, txaus Toughness, thiab Weldability.
Nov yog cov ncauj lus kom ntxaws txog nws cov tshuaj tshwj xeeb profile thiab nws qhov ncaj qha, feem ntau nthuav dav, cuam tshuam rau cov khoom piv rau cov qib qis xws li S690Q / S890Q.
1. Txoj Cai Tswjfwm ntawm S960Q Chemistry
Cov muaj pes tsawg leeg yog engineered rau siab tshaj hardenability nrog tsawg carbon tsawg, leveraging haib micro{0}}alloying thiab meej boron ntxiv. Lub hom phiaj tseem ceeb tshaj plaws yog tsim kom muaj kev sib haum xeeb martensitic / bainitic microstructure nyob rau hauv cov ntu tuab thaum tuav cov Carbon Equivalent (CEV) kom tso cai rau vuam.
2. Kev txheeb xyuas cov ntsiab lus tseem ceeb & lawv lub luag haujlwm tshwj xeeb hauv S960Q
| Element | Ntau yam hauv S960Q (vs. S690Q) | Lub luag haujlwm tshwj xeeb & Kev Tsim Nyog | Kev cuam tshuam ncaj qha rau cov khoom |
|---|---|---|---|
| Cov pa roj carbon (C) | Tsawg heev (~0.12 - 0.18%) (qis dua qhov xav tau) |
Txoj Kev Sib Haum Xeeb Tseem Ceeb. Khaws ntawm qhov tsawg kawg nkaus xav tau rau kev tsim martensite. Qhov no yog thawj kauj ruam rau kev tswj cov weldability thiab toughness nyob rau theem no lub zog. 0.02% nce tuaj yeem ua rau cov hlau tsis tuaj yeem. | ↑ Weldability: Lowers CEV, txo HAZ hardness & txias cracking txaus ntshai. ↑ Toughness: Lows ductile -nkig hloov kub. ↓ Hardenability / Strength: Lub zog tsis txaus yuav tsum tau them los ntawm lwm cov ntsiab lus. |
| Manganese (Mn) | Siab (~1.2 - 1.8%) (Ntau dua S690Q) |
Thawj, tus nqi -zoo hardenability enhancer. Xyuas kom dhau los ntawm - thickness hardening. Tsis tas li ntawd refines nplej thiab pab txhawb kom muaj zog tshuaj ntxiv. | ↑ Hardenability: Qhov tseem ceeb rau cov phaj tuab. ↑ Lub zog: Cov kua nplaum muaj zog. ↑ Risk of Segregation: Nyob rau hauv daim hlau tuab, Mn tuaj yeem cais mus rau qhov chaw nruab nrab, ua mob los ntawm - thickness toughness. |
| Silicon (Si) | Nruab nrab (~0.15 - 0.50%) | Deoxidizer thiab cov kua nplaum muaj zog. Kuj retards tempering, pab tswj lub zog thaum lub sij hawm tempering txheej txheem. | ↑ Lub zog (me). Muaj feem cuam tshuam rau kev tsim cov nplai thaum dov. |
| Micro-Alloys (Nb, V, Ti) | Precise, Optimized Ntxiv (Ntau qhov tseem ceeb tshaj hauv S690Q) |
Cov "Strength Multipliers." • Nb, Ti: Pin cov ciam teb thaum lub sij hawm kub dov, tsim ib qho ultra-zoo ua ntej austenite grain loj. Qhov no yog tus yuam sij kom ua tiav lub zog siab thiab toughness ib txhij. • V: Pab txhawb rau nag lossis daus hardening thaum tempering (V4C3). |
↑↑ Lub zog: muaj zog nplej ua kom zoo thiab nag lossis daus tawv. ↑↑ Toughness: Fine grain loj yog qhov zoo tshaj plaws toughness enhancer. Risk: Tshaj - ntxiv tuaj yeem txo HAZ toughness. |
| Boron (B) | Txoj kev, Qhov Tseem Ceeb Ntxiv (~0.001 - 0.004%) (Lub "Secret Weapon") |
Lub zog hardenability feem ntau. Ob peb ntu ntawm ib lab cais rau cov ciam teb, ua rau ncua sijhawm ferrite tsim, tso cai rau leaner tag nrho cov ntsiab lus alloy. Pab kom siv cov pa roj carbon tsawg. | ↑↑↑ Hardenability: Ua kom 960 MPa lub zog ua tau rau hauv cov ntu tuab nrog qis -carbon puag. Tso cai rau Lean Chemistry: Yog tsis muaj B, ua tiav 960 MPa yuav xav tau ntau dua cov pa roj carbon / alloy, rhuav tshem weldability. |
| Alloying Elements (Cr, Ni, Mo, Cu) | Strategic, Balanced Ntxiv (feem ntau siab dua S690Q) |
• Chromium (Cr): Txhim kho hardenability thiab tempering tsis kam. • Nickel (Ni): Tus thawj toughness enhancer. Qhov tseem ceeb rau kev ua tiav qhov zoo qis - qhov kub thiab txias (-40℃txog -60℃). Feem ntau ntawm 0.8-2.0%. • Molybdenum (Mo): Tiv thaiv temper embrittlement, txhim khu hardenability thiab zog ntawm siab temps. • Copper (Cu): Qee zaum ntxiv rau atmospheric corrosion kuj (xws li, hauv S960QL + CR qib). |
↑ Toughness (Ni): txo qis kev hloov pauv kub. ↑ Hardenability & Strength (Cr, Mo). ↑ Corrosion Resistance (Cu). ↑ Tus nqi & kev nyuaj. |
| Cov impurities (P, S) | Ultra-Low (P Tsawg dua lossis sib npaug rau 0.010%, S Tsawg dua lossis sib npaug rau 0.003%) (Tighter dua S690Q) |
Phosphorus: Mob hnyav embrittler. Nws tswj tsis tau -negotiable. Sulfur: Cov ntaub ntawv suav nrog teeb meem toughness thiab los ntawm -thickness zog. Cov qib raug thawb mus rau qhov tsawg kawg nkaus. Kev kho calcium yog yuav tsum tau ua kom zoo li cov sulfides ntxiv rau hauv cov globules uas tsis muaj teeb meem. |
↑↑ Toughness & Z- Cov Khoom Taw Qhia: Qhov tseem ceeb rau kev tiv thaiv lamellar tearing nyob rau hauv tuab, welded pob qij txha. Ultra- qis S yog qhov yuav tsum tau ua ua ntej rau Z- zoo (xws li S960QL Z35). |
3. Synthesis: Yuav ua li cas lub Cim Chemistry Tsav cov khoom tseem ceeb
A) Ua tiav Ultra-High Strength (Ntau dua lossis sib npaug rau 960 MPa tawm los)
Mechanism: Ib qho kev sib koom ua ke, tsis yog ib lub ntsiab lus.
Tsawg-Carbon Martensite/Bainite: Lub hauv paus microstructure los ntawm Q&T.
Ultra{0}}Fine Grain Refinement: Los ntawm Nb/Ti micro-alloying.
Cov nag lossis daus Hardening: Los ntawm V (C, N) thiab lwm yam carbides thaum tempering.
Solid Solution Strengthening: Los ntawm Mn, Si, thiab yaj alloying ntsiab.
Metallurgical Mastery: Lub zog ua tiav yam tsis muaj kev cia siab rau cov pa roj carbon ntau, uas yog qhov tseem ceeb ntawm kev ua tiav.
B) Tswj Fracture Toughness ntawm qis kub
Mechanism: Qhov no yog qhov kev sib tw tiag tiag. Cov txheej txheem ncaj qha lub hom phiaj toughness:
Tsawg Carbon: Qhov tseem ceeb tshaj plaws rau qhov zoo ntawm qhov toughness.
Nickel Ntxiv: Ncaj qha txhim kho matrix toughness thiab txo qis kev hloov pauv kub.
Grain Refinement (Nb, Ti): Txoj kev ua tau zoo tshaj plaws los txhim kho lub zog thiab tawv.
Ultra-Low Phosphorus & Sulfur: Tshem tawm cov khoom embrittling thiab cov teeb meem cuam tshuam.
Cov txiaj ntsig: Tso cai rau cov qib qis xws li S960QL (-40 degree) thiab S960QL1 (-60 degree), ua rau nws siv tau rau hauv cov ntawv thov tseem ceeb, qhov kub thiab txias.
C) Ua kom "Weldability" (Ib lub ntsiab lus txheeb ze ntawm 960 MPa)
Mechanism: Cov tshuaj muaj pes tsawg leeg yog engineered rau qhov zoo tshaj plaws ua tau, tseem tseem nyuaj, weldability ntawm no lub zog.
Tsawg Carbon Equivalent (CEV): Ua tiav los ntawm kev txo qis C thiab ntsuas Mn thiab lwm yam. Ib txwm CEV (IIW) rau S960Q yog ~ 0.70-0.80. Qhov no yog siab, tab sis qis dua nws yuav yog nrog brute - quab yuam kom siab-carbon.
Boron lub luag hauj lwm: Los ntawm muab hardenability, nws tso cai rau txo cov pa roj carbon thiab alloy cov ntsiab lus uas yuav tsum tau, indirectly pab weldability.
Kev Tshawb Fawb: "Weldable" ntawm no txhais tau tias cov txheej txheem muaj nyob, tab sis lawv muaj kev txwv tsis pub dhau. Nws txib:
Ultra{0}} cov txheej txheem hydrogen tsawg (TIG, Laser Hybrid).
High pre-heat (often >150 degree) thiab nruj interpass kub tswj.
Kev siv tshwj xeeb uas tsim los ntawm siab - toughness, siab - lub zog nyob rau hauv - sib piv los yog sib piv cov khoom siv.
D) Qhia Cov Kev Sib Tw Tshwj Xeeb (Qhov "Qhov cuam tshuam" ntawm Kev Sau Npe)
Severe HAZ Softening: Lub voj voog uas tsis tuaj yeem ua rau lub voj voog ntawm vuam tsim ib qho chaw muag muag uas lub zog tuaj yeem poob mus rau 700-800 MPa. Thaj chaw no cov khoom tam sim no tau hais los ntawm lub voj voog thermal, tsis yog qhov zoo tshaj plaws hauv cov hlau chemistry. Nws dhau los ua tus tsim-tsav tsis muaj zog txuas.
Kev rhiab heev rau Hydrogen: Lub siab -strength martensitic microstructure yog qhov ua tau rau Hydrogen-Induced Cold Cracking (HICC). Qhov qis - carbon chemistry pab, tab sis impeccable hydrogen tswj (qhuav consumables, shielding gas) yog yuav tsum tau.
Tsawg Thickness Efficacy: Lub zog tab sis qhov sib npaug ntawm cov neeg ua haujlwm tawv tawv (B, Mn, Cr) muaj kev txwv. Guaranteed mechanical zog poob ho ntau tshaj 50-60 mm thickness. S960Q yog qhov zoo tshaj plaws hauv daim hlau nyias mus rau nruab nrab (15-50 mm).
Xaus: Lub Pinnacle ntawm Balanced Metallurgy
Cov tshuaj muaj pes tsawg leeg ntawm S960Q tsis yog tsuas yog muaj zog version ntawm S690Q; nws sawv cev rau qhov zoo sib txawv ntawm cov khoom siv hlau.
Rau S690Q / S890Q: Chemistry yog optimized kom ua tiav cov hom phiaj.
Rau S960Q: Chemistry yog qhov siab -wire act kom sib npaug peb qhov kev xav tau tshwj xeeb ntawm ntug ntawm qhov ua tau.
Hauv cov ntsiab lus, S960Q yog cov khoom siv uas txhua 0.01% ntawm cov pa roj carbon, txhua ppm ntawm boron, thiab txhua feem feem pua ntawm cov npib tsib xee raug xam xam. Nws muab lub zog tsis sib xws- rau- qhov hnyav piv rau cov qauv siv tab sis hloov qhov nyuaj los ntawm cov hlau zeb mus rau cov khoom siv hauv pem teb. Nws daim ntawv thov kev vam meej yog nyob ntawm kev hwm qhov cuam tshuam loj ntawm nws cov tshuaj pleev ib ce tshwj xeeb -tshwj xeeb tshaj yog nws cov thermal rhiab heev thiab qhov tsis haum rau qhov tsis txaus siab- los ntawm kev tsim qauv zoo, tsim, thiab kev tswj kom zoo.