PH Stainless hlau

Precipitation hardening stainless hlau muaj cov khoom zoo xws li lub zog siab, siab toughness, siab corrosion kuj, siab oxidation kuj, thiab zoo heev formability thiab weldability.

Cov qhab nia

(1)0Cr17Ni4Cu4Nb steel

Cov hlau no yog martensitic nag lossis daus hardening stainless hlau nrog Ms point ntawm kwv yees li 150 ° C thiab Mf point hauv qab 30 ° C. Txawm hais tias qhov kev hloov pauv martensitic tiav lossis tsis raug cuam tshuam los ntawm kev muaj pes tsawg leeg thiab kev ua kom txias. Cov tooj liab nyob rau hauv cov hlau yog dispersed nyob rau hauv lub matrix nyob rau hauv daim ntawv ntawm heev zoo thiab dispersed ε theem, yog li txhim kho lub zog. Thaum kho H900, σb = 1310MPa, σ0.2 = 1170MPa, δ5 = 10%, ψ = 40%. Cov hlau no muaj kev tiv thaiv corrosion zoo, uas zoo dua li cov hlau tsis zoo martensitic thiab zoo ib yam li cov hlau tsis zoo austenitic. Nws muaj kev ua haujlwm zoo, tuaj yeem welded yam tsis muaj preheating thiab tsis tas yuav tsum tau annealing hauv zos tom qab vuam. Nws yog tsuas yog siv los tsim cov khoom siv corrosion-resistant thiab lub zog siab xws li dav hlau cav compressor casings thiab loj turbine kawg hniav.

(2) 0Cr17Ni7Al hlau

Qib no yog semi-austenitic nag lossis daus hardening stainless hlau. Nws yog hom hlau uas ntxiv txhuas rau 0Cr17Ni7, ib qho tsis ruaj tsis khov austenitic steel, thiab tom qab ntawd ua kom nws los ntawm kev hloov pauv martensitic thiab nag lossis daus ntawm NiAl compounds. Tom qab kev kho RH950, σb = 1580MPa, σ0.2 = 1470MPa, δ5 = 6%. Cov hlau muaj corrosion kuj zoo nyob rau hauv oxidizing acids, tab sis tsis zoo corrosion kuj nyob rau hauv non-oxidizing acids xws li sulfuric acid thiab hydrochloric acid. Acid resistance yog qhov zoo tshaj plaws tom qab kho nrog A lossis A1750. Cov kua qaub tsis kam ua phem dua tom qab kho nrog TH, RH, thiab CH. Cov hlau no tuaj yeem welded siv tib txoj kev vuam zoo li austenitic stainless hlau. Yog hais tias ib tug welding pas nrig nrog ib tug tib muaj pes tsawg leeg raws li lub hauv paus hlau yog siv rau welding, ib tug loj npaum li cas ntawm delta ferrite yuav tshwm sim nyob rau hauv lub vuam, uas ua rau ib tug txo nyob rau hauv lub toughness ntawm weld. Yog li ntawd, cov chromium tuaj yeem raug txo kom tsim nyog los yog npib tsib xee ntxiv hauv cov pas nrig vuam. Inert gas tiv thaiv yuav tsum tau siv thaum lub sij hawm vuam los tiv thaiv oxidation ntawm txhuas nyob rau hauv lub electrode. Txhawm rau kom tau txais kev ua haujlwm vuam zoo, nws yog qhov zoo tshaj plaws los ua cov kev kho mob ntawm cov welds tom qab cov tshuaj annealing, thiab tom qab ntawd kho thiab hnub nyoog lawv. Hom hlau no tsuas yog siv los tsim cov dav hlau casings, cov khoom siv, cov nkoj xaim hluav taws xob thiab cov khoom siv, cov khoom siv dav hlau, cov dej ntws, cov diaphragms, hauv siab, kav hlau txais xov, fasteners, ntsuas ntsuas, thiab lwm yam.

(3)0Cr15Ni25Ti2MoVB steel

Cov hlau yog austenitic nag lossis daus-hardened stainless hlau, hlau-nickel-based high-temperature alloy. Steel muaj ib tug ruaj khov austenite qauv tsis tsuas yog nyob rau hauv lub solid tov lub xeev tab sis kuj nyob rau hauv lub laus lub xeev. - Feem ntau, intermetallic tebchaw yog tsim nyob rau hauv steel kom muaj zog thiab txhim kho cov khoom kub. Nyob rau hauv lub xeev laus σb = 1035MPa, σ0.2 = 690MPa, δ = 25%, ψ = 40%. Cov hlau no muaj lub zog kub zoo thiab tuaj yeem siv rau qhov kub txog li 600-700 ° C. Lub siab kub tawm lub zog qis dua 650 ℃ yog yuav luag tib yam li chav tsev kub. Nws muaj qhov zoo ntawm qhov kub thiab txias, tab sis muaj qhov tsis zoo xws li chav tsev kub tsis muaj zog thiab kev ua haujlwm vuam tsis zoo.