440c thiab 304 sib txawv stainless hlau 304 thiab 440 uas cov khoom zoo dua

440c thiab 304 sib txawv stainless hlau 304 thiab 440 uas cov khoom zoo dua

Stainless hlau 304 thiab 440 cov khoom twg zoo dua? Qhov txawv ntawm ob yam khoom yog dab tsi?
304 yog cov khoom siv zoo dua li 440.

304 yog Austenitic stainless hlau, yog cov hlau feem ntau siv, corrosion tsis kam, kub tsis kam, kub tsis tshua muaj zog, zoo mechanical zog.

440 yog ferritic stainless hlau, nrog cov ntsiab lus C siab thiab hardness siab nyob rau hauv tag nrho cov stainless hlau, feem ntau yog siv rau tej cuab yeej, thiab corrosion kuj yog phem tshaj 304.

Austenitic stainless hlau:

Stainless hlau nrog austenitic qauv ntawm chav tsev kub. Thaum Cr yog li ntawm 18%, Ni8% ~ 10% thiab C yog li 0.1%, cov hlau muaj cov qauv austenitic ruaj khov. Austenitic chromium-nickel stainless hlau suav nrog cov npe nrov 18Cr-8Ni steel thiab siab Cr-Ni series steel tsim los ntawm kev tsim cov ntsiab lus ntawm Cr thiab Ni thiab ntxiv Mo, Cu, Si, Nb, Ti thiab lwm yam. cov ntsiab lus. Austenitic stainless hlau yog cov hlau tsis muaj hlau nplaum thiab muaj qhov toughness thiab plasticity, tab sis lub zog tsis tshua muaj, nws tsis tuaj yeem ntxiv dag zog rau nws los ntawm theem hloov, thiab nws tsuas tuaj yeem ntxiv dag zog los ntawm kev ua haujlwm txias. Yog tias S, Ca, Se, Te thiab lwm yam ntxiv, nws muaj kev ua haujlwm zoo.

Ferritic stainless hlau: muaj cov khoom zoo sib xws rau cov pa roj carbon tsawg, tab sis kuj muaj kev tiv thaiv corrosion zoo dua vim qhov sib ntxiv ntawm li ntawm 11-17% chromium. Vim yog cov ntsiab lus tsis tshua muaj npib tsib xee, ferritic stainless hlau kuj pheej yig nyob rau hauv stainless hlau series, thiab muaj kev tiv thaiv zoo rau chloride corrosion. Lub weldability ntawm ferritic stainless hlau sib txawv raws li muaj pes tsawg leeg. Lub weldability ntawm ferritic stainless hlau yog zoo heev los ntawm nruj tswj cov ntsiab lus martensite thiab txwv cov nag lossis daus carbide nyob rau hauv lub tshav kub cuam tshuam cheeb tsam. Txawm li cas los xij, qhov cuam tshuam toughness ntawm vuam tshav kub cuam tshuam cheeb tsam ntawm yuav luag tag nrho cov ferritic stainless hlau yuav txo vim qhov nce ntawm grain qauv ntawm tshav kub cuam tshuam cheeb tsam. 304 yog Austenitic stainless hlau, 440 belongs rau ferritic stainless hlau, muaj ntau yam sib txawv, txawv tshuaj muaj pes tsawg leeg, siv kuj txawv.

304 stainless hlau yog feem ntau siv hlau, corrosion kuj, tshav kub tsis kam, kub tsis tshua muaj zog, zoo mechanical zog. Sib sib zog nqus stamping, dabtsi yog khoov thiab lwm qhov chaw ua haujlwm kub ua haujlwm zoo dua, tom qab kev kho cua sov yuav tsis tawv.

440 stainless hlau yog cov cuab yeej muaj zog hlau, cov ntsiab lus siab dua me ntsis, tom qab kev kho cua sov tsim nyog tuaj yeem tau txais cov txiaj ntsig siab, qhov nyuaj tuaj yeem ncav cuag 58HRC, yog cov hlau tsis muaj zog tshaj plaws. Feem ntau piv txwv yog "razor blade". Corrosion tsis kam yog qhov phem tshaj 304.

304 stainless hlau thiab 440 stainless hlau, peb muaj ntawm cov hlau. 440 yog ib lub siab hardness stainless hlau, siv nyob rau hauv daim ntawv thov yuav tsum tau siab hardness thiab corrosion kuj. Zoo li rab chais. Tab sis qhov corrosion kuj tsis zoo li 304.

304 yog universal stainless hlau, dav siv nyob rau hauv cov zaub mov thiab kev kho mob industries. 304 machining kev ua tau zoo tsis zoo, tab sis zoo molding. Nws corrodes sai sai nyob rau hauv lub xub ntiag ntawm chloride ions.

In general, 304 is universal and can be used in many occasions. 440 is for high hardness applications. The carbon content and hardness of 440 A-440 B-440C are progressively increased from A-B-C (A-0.75%, B-0.9%, C-1.2%). 440C is a very good high-end stainless steel, hardness usually reaches 56-58Rc. The rust resistance of these three kinds of steel is good, 440A is the best, and 440C is the lowest. SOG SEAL 2000 uses 440A and Randall uses 440B to produce their stainless steel cutters. 440C is widely used and is probably the second most commonly used stainless steel (after ATS-34). If your knife is labeled "440," then it is likely to be cheaper than 440A; If manufacturers use a more expensive 440C, they will be happy to advertise this. The general feeling is that the 440A is just right for everyday use, especially the 440A with a good heat treatment (we heard that SOG's 440A heat treatment is very well received, I wonder who they hired to do this). The 440B is sturdier, while the 440C is superior. 304 stainless steel is a grade of stainless steel produced according to ASTM standards in the United States. 304 is equivalent to 0Cr19Ni9 (0Cr18Ni9) stainless steel in China. 304 contains 19% chromium and 9% nickel. 304 is the most widely used stainless steel, heat-resistant steel. Used in food production equipment, Xitong chemical equipment, nuclear energy, etc. Ferritic stainless steel does not contain nickel, and the main elements are chromium (>10%) thiab hlau, chromium yog ib qho tshwj xeeb corrosion-resistant khoom ntawm stainless hlau, thiab nws cov nqi yog ruaj khov.

1. Ferritic stainless steel (400 series) contains 15%~30% chromium and has a body-centered cubic crystal structure. This kind of steel generally does not contain nickel, and sometimes contains a small amount of mo, ti, nb and other elements, this kind of steel has a large thermal conductivity, small expansion coefficient, good oxidation resistance, excellent stress corrosion and other characteristics, and is used to manufacture parts resistant to atmospheric, water vapor, water and oxidizing acid corrosion. The price of ferritic stainless steel is not only relatively low and stable, and has many unique characteristics and advantages, it has been proven that in many applications that were originally thought to be only austenitic stainless steel (300 series), ferritic stainless steel is an excellent alternative material, ferritic stainless steel does not contain nickel, the main elements are chromium (>10%) thiab hlau, thiab cov ntsiab lus tseem ceeb yog: Chromium yog ib qho tshwj xeeb corrosion-resistant cov hlau stainless, thiab nws cov nqi kuj tseem ruaj khov.

2, 304 stainless hlau yog cov khoom siv hauv stainless hlau, qhov ntom ntawm 7.93g / cm3, kev lag luam tseem hu ua 18/8 stainless hlau. Kev kub siab ua haujlwm ntawm 800 degrees, nrog kev ua haujlwm zoo, cov yam ntxwv siab tawv, dav siv hauv kev lag luam thiab rooj tog kho kom zoo nkauj kev lag luam thiab zaub mov thiab kev lag luam kho mob. 304 yog ntau yam stainless hlau, uas yog siv dav hauv kev tsim cov khoom siv thiab cov khoom uas xav tau cov khoom zoo (corrosion resistance and formability). Yuav kom tswj tau qhov kev tiv thaiv corrosion ntawm cov hlau tsis muaj hlau, cov hlau yuav tsum muaj ntau dua 18% chromium thiab ntau dua 8% cov ntsiab lus nickel. 304 stainless hlau yog qib stainless hlau ua raws li cov qauv astm hauv Tebchaws Meskas.

1, raws li stainless hlau tshav kub resistant steel yog feem ntau lug siv, khoom noj khoom haus, generalized khoom, atomic zog industrial khoom. 304 yog cov hlau ntau tshaj plaws, corrosion tsis kam, kub tsis kam, tsis tshua muaj zog kub, zoo txhua yam khoom. Sib sib zog nqus stamping, dabtsi yog khoov thiab lwm qhov chaw ua haujlwm kub ua haujlwm zoo dua, tom qab kev kho cua sov yuav tsis tawv. 1 lossis 2 hom khoom siv sab hnub poob, dab dej, kav dej hauv tsev, lub rhaub dej, lub dab da dej, boiler, nws pib qhov chaw (lub qhov rais huv si, rov qab cov yeeb nkab), cov tshuab kho mob, cov khoom siv hauv tsev, tshuaj, khoom noj khoom haus kev lag luam, textile kev lag luam, khoom noj siv mis, nkoj qhov chaw.