Thaum xaiv cov hlau phaj rau cov hlab ntsha siab, boilers, los yog cov khoom siv, engineers thiab procurement teams feem ntau ntsib kev lag luam -tawm ntawm lub zog, toughness, weldability, thiab nqi.
Cov xwm txheej kev txiav txim siab ib txwm muaj xws li xaiv cov khoom siv rau siab- khaws cov cuab yeej, qis- qhov kub thiab txias tso tsheb hlau luam, lossis cov khoom hnyav- ntu ntu uas xav tau cov phaj nyias nyias los txo qhov hnyav.
SPA-C thiabSPA-Hfeem ntau piv vim hais tias lawv muaj kev cuam tshuam ob qho tib si metallurgical tsim philosophies.
SPA-C yog qhov tseem ceeb ntawm cov ntsiab lus qis dua, muaj zog dua, thiab yooj yim ntawm kev tsim, thaum SPA-H yog tsim los rau kev ua kom muaj zog dua thiab ua tiav lub zog siab dua, feem ntau los ntawm kev sib tsoo thiab kev kho cua sov.
Kev nkag siab txog qhov sib txawv no yog qhov tseem ceeb rau kev xaiv cov khoom tsim nyog tshaj plaws rau ib puag ncig kev pabcuam.
Standards thiab Designations
SPA- hom nomenclature tshwm nyob rau hauv cov khoom lag luam catalogs, cov npe khoom qub txeeg qub teg, thiab siab -cov ntaub ntawv steel, feem ntau cuam tshuam nrog ASME/ASTM- raws li tsev neeg cov khoom. Txawm li cas los xij, cov ntsiab lus tseeb sib txawv raws cheeb tsam thiab cov chaw muag khoom, ua rau nws tseem ceeb kom paub meej tias tus qauv tswj ua ntej yuav khoom.
Cov txheej txheem tsim nyog muaj xws li:
ASME / ASTM (lub nkoj siab thiab boiler steels)
EN (European qauv)
JIS (Japanese Industrial Standards)
GB (Suav teb chaws tus qauv)
Steel Family Classification
SPA-C: Feem ntau yog cov pa roj carbon lossis tsawg- alloy carbon steel npaj rau siab- cov kev pab cuam lub nkoj, hais txog qhov toughness thiab weldability.
SPA-H: Feem ntau yog siab dua -hardenability carbon los yog tsawg- alloy steel, tsim los ua kom muaj zog ntau dua los ntawm kev sib tsoo thiab kev kho cua sov.
Qhov tseem ceeb: SPA prefix ib leeg tsis txhais chemistry lossis khoom. Cov hauv qab ASTM, EN, JIS, lossis GB specification thiab daim ntawv pov thawj zeb xeem (MTC) ib txwm tswj hwm cov cai kawg.
Chemical Composition thiab Alloying Strategy
Cov tswv yim sib xyaw ua ke ntawm SPA-C thiab SPA-H txawv hauv paus. SPA-C txwv cov ntsiab lus carbon thiab alloy kom ua kom cov ductility thiab weldability, thaum SPA-H suav nrog ntau dua alloying los txhim kho hardenability thiab lub zog muaj peev xwm.
Qhov taw qhia muaj pes tsawg leeg (wt%, ib txwm nkaus xwb)
| Element | SPA-C (qhia) | SPA-H (qhia) |
|---|---|---|
| C | 0.06 – 0.20 | 0.15 – 0.35 |
| Mn | 0.3 – 0.9 | 0.5 – 1.2 |
| Si | 0.10 – 0.40 | 0.10 – 0.50 |
| P | Tsawg dua los yog sib npaug ntawm 0.025 - 0.035 | Tsawg dua lossis sib npaug li 0.030 - 0.040 |
| S | Tsawg dua los yog sib npaug ntawm 0.025 - 0.035 | Tsawg dua lossis sib npaug li 0.030 - 0.040 |
| Cr | Tsawg dua los yog sib npaug li 0.30 | 0.20 – 1.00 |
| Ni | Tsawg dua los yog sib npaug li 0.30 | 0.20 – 1.50 |
| Mo | Tsawg dua lossis sib npaug li 0.10 | 0.05 – 0.60 |
| V | Tsawg dua los yog sib npaug li 0.05 | 0.02 – 0.20 |
| Nb (Cb) | kev - 0.02 | kev - 0.06 |
| Ti | kev - 0.02 | txoj kev - 0.05 |
| B | taug qab (feem ntau tsis muaj) | Cov kab mob (ppm) |
| N | Tsawg dua lossis sib npaug li 0.012 | Tsawg dua lossis sib npaug li 0.012 |
Cov nyhuv ntawm alloying
Carbon tswj lub zog thiab hardenability tab sis txo ductility thiab weldability thaum nce.
Manganese txhim kho lub zog thiab hardenability tab sis tuaj yeem txo qhov toughness yog tias ntau dhau.
Cr, Mo, Ni txhim khu hardenability thiab siab - kub zog.
Microalloying (V, Nb, Ti) refines grain loj thiab txhim kho lub zog - toughness tshuav nyiaj li cas.
Boron (ppm ntau ntau) nce hardenability thaum tswj tau meej.
Microstructure thiab Thaum tshav kub kub-Kev kho teb
Hom microstructures
SPA-C: Ferrite-pearlite qauv nyob rau hauv raws li - dov los yog normalized mob, muab zoo thais toughness.
SPA-H: Bainitic lossis martensitic cov qauv ua tiav tom qab tswj tau txias lossis quench-thiab- kev ua haujlwm kub; tempered martensite los yog bainite muab lub zog ntau dua.
Thaum tshav kub kub-kev kho tus cwj pwm
Normalizing txhim kho cov nplej zom thiab tawv tawv hauv ob qib, nrog SPA-C tau txais txiaj ntsig zoo tshaj plaws.
Quench & temper (Q&T) yog lub hauv paus rau SPA-H kom ua tiav lub zog siab nrog kev tswj nruj.
Thermo-mechanical controlled processing (TMCP) tuaj yeem ua kom zoo dua qhov sib npaug ntawm qhov sib npaug, tshwj xeeb tshaj yog nyob rau hauv microalloyed variants.
Mechanical Properties
| Khoom | SPA-C | SPA-H |
|---|---|---|
| Tensile zog (MPa) | 380 – 550 | 500 – 900 |
| Yield zog (MPa) | 230 – 350 | 350 – 700 |
| Elongation (%) | 18 – 30 | 8 – 20 |
| Impact toughness | Siab, zoo qis -kev ua haujlwm kub | Variable, kev kho mob -nyob |
| Hardness (HB) | ~120 – 200 | ~160 – 320 |
Txhais lus:
SPA-H muaj lub zog ua tau zoo dua qub, feem ntau ntawm cov nqi ntawm cov khoom siv thiab kev sib txuas. SPA-C muab qhov kev zam txim ntau dua rau kev cuam tshuam -rhiab lossis txias- daim ntawv thov kev pabcuam.
Weldability
Weldability feem ntau yog tswj hwm los ntawm carbon sib npaug (CE) thiab Pcm, tsis yog qib npe ib leeg.
SPA-C: qis CE thiab Pcm → tsawg tsawg preheat, qis hydrogen cracking txaus ntshai.
SPA-H: Ntau dua hardenability → yuav tsum tau preheat, tswj interpass kub, qis-hydrogen consumables, thiab feem ntau PWHT.
Cov teebmeem Microalloying yuav tsum tau hais los ntawm qhov tsim nyog Welding Procedure Specification (WPS).
Corrosion thiab Surface Protection
Cov qib tsis yog corrosion- tiv taus los ntawm nws tus kheej. Kev tiv thaiv yog nyob ntawm:
Txheej txheej (epoxy, polyurethane)
Kub-dip galvanizing (nrog tuab thiab kub txwv)
Metallizing los yog cathodic tiv thaiv
PREN qhov tseem ceeb tsis siv, vim cov no yog cov pa roj carbon / qis- alloy steels es tsis yog stainless hlau.
Fabrication thiab Machining
Machinability: SPA-C tshuab tau yooj yim dua; SPA-H ua rau cov cuab yeej hnav dua.
Formability: SPA-C txhawb nqa nruj dua dabtsi yog khoov radii; SPA-H tej zaum yuav xav tau radii loj dua los yog ua kom sov.
Fabrication tswj: SPA-H xav tau kev tswj xyuas nruj dua ntawm qhov seem ntawm kev ntxhov siab, kev cuam tshuam, thiab cov khoom cua sov.
Tej kev siv
| SPA-C | SPA-H |
|---|---|
| Siab-cov nkoj plhaub nrog qis- kub toughness | Siab - cov hlab ntsha siab |
| Lub tank cia thiab nruab nrab - cov kav dej siab | Quenched-thiab- cov phaj tempered |
| General structural phaj | Lub tshuab hnyav thiab thauj khoom - cov khoom tseem ceeb |
Nqi thiab Muaj
Tus nqi: SPA-H feem ntau kim dua vim yog alloying thiab kev kho cua sov.
Muaj: SPA-C yog dav dav; SPA-H feem ntau tsim los txiav txim nrog lub sij hawm ntev dua.
Daim ntawv: Daim hlau feem ntau yog; SPA-H kuj tau teev tseg rau forgings.
Q1: Dab tsi yog SPA-H Corten steel?
SPA-H yog cov txheej txheem Nyij Pooj huab cua hlau qib uas tau teev tseg hauv JIS G 3125. Nws muaj cov ntsiab lus alloying xws li tooj liab, chromium, thiab npib tsib xee, uas tso cai rau nws los tsim cov txheej txheem tiv thaiv xeb ntawm qhov chaw. Qhov patina no ua rau qeeb ntxiv corrosion thiab txhim kho ntev -lub sij hawm durability nyob rau hauv atmospheric ib puag ncig.
Q2: Dab tsi yog qhov zoo ntawm SPA-H weathering steel?
Cov txiaj ntsig tseem ceeb ntawm SPA-H steel muaj xws li cov huab cua zoo corrosion kuj, siab zog, thiab tus nqi tu qis. Tsis zoo li cov pa roj carbon zoo tib yam, SPA-H tsis tas yuav tsum tau pleev xim ntau dhau los yog txheej txheej, uas yuav pab txo qis cov nqi ntawm lub neej thaum tuav lub cev zoo nkauj.
Q3: SPA -H Corten steel feem ntau siv nyob qhov twg?
SPA-H hlau yog dav siv nyob rau hauv cov txuas hniav, lub tsev cov qauv, architectural façades, railway carriages, ntim, cua preheaters, thiab economizers. Nws yog qhov tshwj xeeb tshaj yog tsim rau cov qauv sab nraum zoov uas raug hloov pauv huab cua rau lub sijhawm ntev.
Q4: Puas yog SPA-H steel xav tau kev pleev xim lossis kho qhov chaw?
Hauv feem ntau cov ntawv thov sab nraum zoov, tsis tas yuav tsum tau pleev xim ntxiv. SPA-H ib txwm tsim txheej txheej xeb ruaj khov tom qab raug rau qhov chaw. Txawm li cas los xij, nyob rau hauv ib puag ncig corrosive heev (xws li marine los yog siab - thaj chaw ntsev), ntxiv kev tiv thaiv saum npoo tuaj yeem raug pom zoo kom txuas lub neej ua haujlwm.
Q5: Nws siv sijhawm ntev npaum li cas rau SPA-H steel los tsim patina ruaj khov?
Nyob rau hauv cov huab cua ib puag ncig, SPA-H steel feem ntau tsim cov patina ruaj khov hauv 6 txog 24 lub hlis
