Dear Friends
Basically Good curability depends upon the melting point of oxide formed during cutting , and it should have lower melting point than adjacent base metal
i) To explain in simple word --Incase of CS ,when you are cutting with oxy acetylene fuel , Initially the outer orifices of cuttogen /nozzle preheats the area to be cut which oxidizes the Fe in the vicinity of cutting edge , later on you inject the oxygen through central orifice therefore the further oxidation,creates the exothermic reaction which increases the temperature in the creft (Cut), resulting in to melting of iron oxide and forms the creft and causes the cutting action , The creft side wall having thin oxide layer which is having lower melting temperature than adjacent base metal. The molten slag in the cut being forced out by oxygen lance and this way the cutting operation takes place.
ii) In case of CS, the melting temp of Oxidised slag/iron is lower than melting point of Iron therefore CS is having good cutabilty than SS or high carbon steel
iii) Incase of SS – if you use oxy acy fuel to cut , The Cr in SS gets oxidized and melting temperature of Cr Oxide is much higher than actual SS base metal therefore you can not cut the SS , aluminium, C.I.and Non ferrous with GAS fuel due to its poor cutablity
Regards
Hegde P.B.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of ali asghari
Sent: Wednesday, July 28, 2010 9:28 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:6155] why plsama cutting in ss
because the speed of cutting& concentration of heat in plasma is more than oxyacetelene cuttng, therefore cooling rate is most& St.St isn't sentisized.
On Tue, Jul 27, 2010 at 6:10 PM, mijin <mathew.mijin@gmail.com> wrote:
why we are using plasma cutting in stainless steel instead of
oxyacetelene cuttng.please give me a reason...
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