Martensitic stainless hlau yog hais txog ib hom stainless hlau uas nws microstructure yog martensite. Cov ntsiab lus chromium ntawm martensitic stainless hlau yog nyob rau hauv thaj tsam ntawm 12% - 18%, thiab nws cov ntsiab alloying tseem ceeb yog hlau, chromium, nickel thiab carbon.
Martensitic stainless hlau tuaj yeem kho nws cov khoom siv kho tshuab los ntawm kev kho cua sov thiab yog ib hom hardenable stainless hlau. Martensitic stainless hlau tuaj yeem muab faib ua martensitic chromium steel thiab martensitic chromium-nickel steel raws li cov tshuaj sib txawv.
Ceev saib ntawm Martensitic Stainless Hlau | |
| Qeb | Stainless hlau |
| Txhais | Ib hom hardenable stainless hlau nrog Martensitic qauv |
| Kev kho cua sov | Annealing, quenching, tempering |
| Alloy Elements | Cr, Ni, C, Mo, V |
| Weldability | pluag |
| Sib nqus | Nruab nrab |
| Micro Structure | Feem ntau Martensitic |
| Hom Qib | Cr13, 2Cr13, 3Cr13 |
| Daim ntawv thov | Chav turbine hniav, Tableware, Surgical Instruments, Aerospace, Marine industries |
Martensitic stainless hlau yog hais txog ib hom stainless hlau uas nws microstructure yog martensite. Cov ntsiab lus chromium ntawm martensitic stainless hlau yog nyob rau hauv thaj tsam ntawm 12% - 18%, thiab nws cov ntsiab alloying tseem ceeb yog hlau, chromium, nickel thiab carbon.
Martensitic stainless hlau tuaj yeem kho nws cov khoom siv kho tshuab los ntawm kev kho cua sov thiab yog ib hom hardenable stainless hlau. Martensitic stainless hlau tuaj yeem muab faib ua martensitic chromium steel thiab martensitic chromium-nickel steel raws li cov tshuaj sib txawv.
1. Martensitic Chromium hlau
Ntxiv nrog rau chromium, martensitic chromium steel kuj muaj qee cov pa roj carbon. Cov ntsiab lus chromium txiav txim siab corrosion kuj ntawm steel. Qhov siab dua cov ntsiab lus carbon, qhov siab dua lub zog, hardness thiab hnav tsis kam. Cov qauv ntawm cov hlau no yog martensite, thiab qee qhov kuj muaj me me ntawm austenite, ferrite lossis pearlite. Nws yog tsuas yog siv los tsim cov khoom, cov khoom, cov cuab yeej, riam, thiab lwm yam uas yuav tsum tau muaj zog thiab hardness, tab sis tsis xav tau siab corrosion kuj. Hom steel qib yog 2Crl3, 4Crl3, 9Crl8, thiab lwm yam.
2. Martensitic Chromium-Nickel steel
Martensitic chromium-nickel steel muaj xws li martensitic nag lossis daus hardening stainless hlau, semi-austenitic nag lossis daus hardening stainless hlau thiab maraging stainless hlau, thiab lwm yam., tag nrho cov uas yog high-strength los yog ultra-high-strength stainless hlau. Cov hlau no muaj cov ntsiab lus carbon tsawg (tsawg dua 0.10%) thiab muaj cov nickel. Qee qib kuj muaj cov ntsiab lus siab xws li molybdenum thiab tooj liab. Yog li ntawd, hom hlau no muaj lub zog siab, thaum sib txuas lub zog thiab toughness nrog rau corrosion kuj. Kev ua tau zoo, weldability, thiab lwm yam zoo dua li martensitic chromium hlau. Crl7Ni2 yog cov feem ntau siv tsawg-nickel martensitic stainless hlau.
Martensitenag lossis daus hardening stainlesssteel feem ntau kuj muaj Al, Ti, Cu thiab lwm yam. Nws precipitates Ni3A1, Ni3Ti thiab lwm yam dispersion ntxiv dag zog rau theem ntawm martensite matrix los ntawm nag lossis daus hardening los txhim kho lub zog ntawm cov hlau. Semi-austenite (los yog semi-martensitic) nag lossis daus hardening stainless hlau, vim hais tias lub xeev quenched tseem austenite, yog li lub xeev quenched tseem tuaj yeem ua haujlwm txias thiab tom qab ntawd ntxiv dag zog los ntawm kev kho nruab nrab, kev laus thiab lwm yam txheej txheem. Nyob rau hauv txoj kev no, lub austenite nyob rau hauv martensitic nag lossis daus hardening stainless hlau tuaj yeem hloov ncaj qha mus rau hauv martensite tom qab quenching, uas ua rau muaj qhov tsis zoo ntawm kev nyuaj hauv kev ua tom qab thiab kev tsim. Feem ntau siv cov qib steel yog 0Crl7Ni7AI, 0Crl5Ni7M02A1 thiab lwm yam. Hom hlau no muaj lub zog muaj zog, feem ntau ncav cuag 1200-1400 MPa, thiab feem ntau yog siv los ua cov txheej txheem uas tsis tas yuav muaj kev tiv thaiv corrosion, tab sis yuav tsum muaj lub zog siab.
Kev kho cua sov feem ntau rau martensitic stainless hlau yog quenching thiab tempering kho. Feem ntau xaiv kom txias hauv roj lossis cua ntawm qhov kub ntawm 950-1050 ℃. Tom qab ntawd kub ntawm 650-750 ° C. Feem ntau, nws yuav tsum tau tempered tam sim ntawd tom qab quenching nyob rau hauv thiaj li yuav tiv thaiv lub casting los ntawm cracking vim qhov kev nyuaj siab ntawm lub quenched qauv.
High-strength low-carbon martensitic stainless hlau castings uas muaj ib tug me me ntawm npib tsib xee, molybdenum, silicon thiab lwm yam alloying ntsiab muaj zoo txhua yam khoom, vuam zog thiab hnav tsis kam tom qab normalizing thiab tempering. Xws li castings yog dav siv nyob rau hauv ib qho tseem ceeb casting thiab casting + vuam impellers loj hydraulic turbines. Nyob rau hauv cov ntaub ntawv no, kev kho cua sov specification feem ntau xaiv yog normalizing ntawm 950 - 1050 ℃ thiab tempering ntawm 600 -670 ℃.
Post lub sij hawm: Aug-17-2021