SS316 bakin karfe yawanci ana amfani dashi don dogo da aka girka kusa da tafkuna ko teku.SS304 sune kayan gama gari na cikin gida ko waje.
A matsayin maki na asali na AISI na Amurka, bambancin aiki tsakanin 304 ko 316 da 304L ko 316L shine abun cikin carbon.
Matsakaicin adadin carbon shine 0.08% matsakaicin don 304 da 316 da 0.030% matsakaicin don nau'ikan 304L da 316L.
Duk sauran nau'ikan nau'ikan suna da gaske iri ɗaya ( kewayon nickel na 304 shine 8.00-10.50% kuma don 304L 8.00-12.00%).
Akwai nau'in ƙarfe na Turai guda biyu na nau'in '304L', 1.4306 da 1.4307.1.4307 shine bambance-bambancen da aka fi bayarwa, a wajen Jamus.1.4301 (304) da 1.4307 (304L) suna da kewayon carbon na 0.07% matsakaicin da 0.030% mafi girma, bi da bi.Matsakaicin chromium da nickel iri ɗaya ne, nickel na duka maki biyu suna da mafi ƙarancin 8%.1.4306 shine ainihin matakin Jamusanci kuma yana da mafi ƙarancin 10% Ni.Wannan yana rage abun ciki na ferrite na karfe kuma ya gano ya zama dole don wasu hanyoyin sinadarai.
Makin Turai don nau'ikan 316 da 316L, 1.4401 da 1.4404, sun dace da duk abubuwan da ke da kewayon carbon na 0.07% matsakaicin 1.4401 da 0.030% matsakaicin don 1.4404.Hakanan akwai manyan nau'ikan Mo (2.5% mafi ƙarancin Ni) na 316 da 316L a cikin tsarin EN, 1.4436 da 1.4432 bi da bi.Don kara dagula al'amura, akwai kuma maki 1.4435 wanda duka biyun ne a Mo (2.5% mafi karanci) da kuma a Ni (12.5%).
Tasirin carbon akan juriya na lalata
The ƙananan carbon 'bambance-bambancen' (316L) da aka kafa a matsayin madadin ga 'ma'auni' (316) carbon kewayon sa shawo kan hadarin intercrystalline lalata (weld lalata), wanda aka gano a matsayin matsala a farkon kwanaki na aikace-aikace na wadannan karafa.Wannan na iya haifar da idan an riƙe ƙarfe a cikin kewayon zafin jiki na 450 zuwa 850 ° C na tsawon mintuna da yawa, dangane da zafin jiki kuma daga baya ya fallasa ga mummuna yanayi.Lalata sannan yana faruwa kusa da iyakokin hatsi.
Idan matakin carbon da ke ƙasa da 0.030% to wannan lalatawar intercrystalline baya faruwa biyo bayan fallasa waɗannan yanayin zafi, musamman ga irin lokutan da aka saba samu a yankin zafi da ya shafa na welds a cikin sassan 'kauri' na ƙarfe.
Tasirin matakin carbon akan weldability
Akwai ra'ayi cewa ƙananan nau'in carbon sun fi sauƙi don walda fiye da daidaitattun nau'in carbon.
Babu alama babu wani dalili mai mahimmanci ga wannan kuma bambance-bambancen tabbas suna hade da ƙananan ƙarfin ƙananan nau'in carbon.Ƙananan nau'in carbon na iya zama da sauƙi don siffa da kuma samuwa, wanda kuma zai iya rinjayar matakan damuwa na saura da ya bar karfe bayan yana samuwa da kuma dacewa don walda.Wannan na iya haifar da nau'ikan nau'ikan carbon 'misali' suna buƙatar ƙarin ƙarfi don riƙe su a matsayi da zarar an daidaita su don walda, tare da ƙarin ɗabi'ar dawowar bazara idan ba a riƙe su da kyau ba.
Abubuwan amfani da walda don nau'ikan nau'ikan biyu suna dogara ne akan ƙaramin abun da ke cikin carbon, don guje wa haɗarin lalata intercrystalline a cikin ingantaccen walda nugget ko kuma watsawar carbon cikin mahaifa (kewaye) ƙarfe.
Dual-certification na ƙananan carbon abun da ke ciki karafa
Karfe da ake samarwa da kasuwanci, ta hanyar yin amfani da hanyoyin ƙera ƙarfe na yanzu, galibi ana samar da su azaman ƙarancin nau'in carbon a matsayin al'amari na gaske saboda ingantacciyar kulawa a cikin ƙirar ƙarfe na zamani.Don haka ana ba da samfuran ƙarfe waɗanda aka gama da su ga kasuwa 'ƙwararrun bokan biyu' zuwa ƙayyadaddun ƙira guda biyu kamar yadda za'a iya amfani da su don ƙirƙira ƙirƙira da ke ƙayyadaddun darajar ko dai, tsakanin ƙayyadaddun ƙayyadaddun ƙayyadaddun.
Nau'i 304
TS EN 10088-2 1.4301 / 1.4307 zuwa ma'aunin Turai.
ASTM A240 304/304L KO ASTM A240 / ASME SA240 304/304L zuwa ka'idojin jirgin ruwa na Amurka.
Nau'o'i 316
TS EN 10088-2 1.4401 / 1.4404 zuwa ma'aunin Turai.
ASTM A240 316/316L KO ASTM A240 / ASME SA240 316/316L, zuwa ma'aunin jirgin ruwa na Amurka.
Lokacin aikawa: Agusta-19-2020