Q295NH thiab Q355NH yog ob feem ntau teev Suav - tsim siab - lub zog cov qauv hlau siv hla lub siab- nkoj, choj, thiab kev lag luam hnyav.
Qhov kev sib txawv ntawm qhov tseem ceeb yog lub hom phiaj lub zog: Q355NH tau teev tseg rau qhov siab tshaj qhov muaj zog tshaj li Q295NH. Vim tias ob qib sib piv cov kev xav zoo sib xws (cov pa roj carbon tsawg, microalloying thiab tswj kev ua haujlwm), lawv feem ntau muab piv thaum cov neeg tsim qauv nrhiav kev ua kom qhov hnyav, kev nyab xeeb, lossis kev tsim khoom tsim khoom.
Cov qauv loj uas cov qhab nia sib npaug lossis muaj feem cuam tshuam tshwm sim:
GB (Tib neeg lub koom pheej ntawm Tuam Tshoj lub teb chaws tus qauv): Q295NH, Q355NH tshwm nyob rau hauv GB/T designations for normalized and heat-kho structural steels, or pressure-vsel steels nyob ntawm tus qauv tseeb.
EN (European): cov qauv hlau sib piv yog nyob rau hauv S-series (piv txwv li, S275, S355) txawm tias qhov sib npaug ncaj qha yuav tsum tau lees paub los ntawm cov ntaub ntawv siv tshuab thiab tshuaj.
ASTM / ASME: qib analogous (los ntawm lub zog) suav nrog ASTM A572 rau cov qauv duab; kev hloov pauv ncaj qha yuav tsum muaj kev sib txuam thiab kev pom zoo.
JIS: Cov qauv hauv Nyij Pooj muaj lawv tus kheej lub npe uas xav tau cov rooj hloov dua siab tshiab thiab kuaj xyuas khoom.
Kev faib tawm: Ob qho Q295NH thiab Q355NH yog qis- alloy, siab- lub zog steels (HSLA qeb hauv cov ntsiab lus dav). Lawv tsis yog stainless los yog cov cuab yeej hlau.
Ob qib yog tsim raws li qis-carbon, microalloyed steels. Lawv feem ntau muaj cov pa roj carbon, manganese, thiab silicon ua cov ntsiab lus tseem ceeb, nrog kev tswj hwm phosphorus thiab sulfur, thiab ntxiv me me ntawm microalloying cov ntsiab lus (Nb, V, Ti) los ua kom cov nplej thiab ua kom muaj zog los ntawm kev ua kom muaj zog los nag lossis ua kom zoo dua cov nplej.
Tshuaj muaj pes tsawg leeg
| Element | Q295NH (lub luag haujlwm tseem ceeb) | Q355NH (lub luag haujlwm tseem ceeb) |
|---|---|---|
| C (Carbon) | Tsawg - sib npaug ntawm lub zog thiab weldability | Tsawg mus rau nruab nrab - me ntsis siab dua los txhawb cov txiaj ntsig siab dua |
| Manganese (Mn) | Nruab nrab - deoxidation thiab lub zog | Nruab nrab mus rau siab dua - nce hardenability thiab zog |
| Si (Silicon) | Me - deoxidizer, me zog | Me - lub luag haujlwm zoo sib xws |
| P (phosphorus) | Tswj ( impurity ) | Tswj ( impurity ) |
| S (Sulfur) | Tswj ( impurity ) | Tswj ( impurity ) |
| Cr, Ni, Mo | Feem ntau tsawg los yog kab; tsis tseem ceeb alloying | Feem ntau tsawg los yog kab; tsis tseem ceeb alloying |
| V, Nb, Ti (microalloys) | Feem ntau muaj nyob rau hauv me me rau grain refinement | Feem ntau siv thiab - tuaj yeem hloov kho kom ua tiav lub zog siab dua |
| B, N | Txoj kab; nitrogen tswj rau toughness | Txoj kab; nitrogen tswj rau toughness |
Mechanical zog
| Khoom | qw 295n | qw 355n |
|---|---|---|
| Qhia tawm yam tsawg kawg nkaus lub zog | ~ 295 MPa (qib nominal) | ~ 355 MPa (qib nominal) |
| Tensile zog | Hom kab mob nruab nrab; nyob ntawm thickness/kub kho | Hom ntau dua; nce tensile muaj peev xwm vs Q295NH |
| Elongation (txhim kho) | Zoo ductility haum rau kev tsim | Me ntsis elongation qis dua Q295NH ntawm qhov sib npaug thickness vim muaj zog dua |
| Impact toughness | Tsim kom muaj kev cuam tshuam zoo toughness; nyob ntawm Charpy kub yuav tsum tau | Engineered kom ua tau raws li qhov sib npaug lossis me ntsis ntxiv qhov xav tau kom muaj zog ntawm qhov ntsuas kub; nyob ntawm normalized mob |
| Hardness | Nruab nrab | Siab dua Q295NH thaum un- tempered vim muaj zog dua |
Tej kev siv
| Q295NH (cov ntawv thov raug) | Q355NH (cov ntawv thov raug) |
|---|---|
| General structural cov tswv cuab uas yuav tsum tau muaj zog me ntsis thiab siab ductility (tsev thav duab, rail Cheebtsam) | Cov khoom siv hnyav dua qhov twg qhov hnyav txo lossis siab dua lub peev xwm yuav tsum tau (crane booms, hnyav txuas hniav) |
| Siab- cov khoom hauv nkoj nrog cov qauv tsim qauv siab thiab cov kev xav tau zoo toughness | Siab- cov plhaub plhaub thiab cov khoom siv welded uas siab dua tso cai los yog txo cov tuab yog xav tau |
| Fabricated ntu uas yuav tsum tau ua kom dav los yog khoov txias | Fabricated qhov chaw nrog kev tsim qauv siab dua, ntev -span girders, lossis machinery thav duab qhov twg lub zog - rau - qhov hnyav optimization yog qhov tseem ceeb |
