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Subject:
Annealing temperature of soft/mild steel
Category: Miscellaneous Asked by: firebreather-ga List Price: $10.00 |
Posted:
18 Feb 2003 12:11 PST
Expires: 20 Mar 2003 12:11 PST Question ID: 163091 |
Hello. I would like to know the annealing temperature of copper coated mild/soft steel welding rod. I use this rod to make jewelry and anneal it myself by heating it up with a oxy/acet mini torch till it becomes yellow in color and before it loses shape and then I let it cool to room temperature. It doesn't take very long to anneal the rod with the torch. My question is this-- I would like to borrow my friends kiln to heat up a large amount of 3/32 rod and was wondering at what temperature do I set the kiln at to minimize the time the rod sits in the kiln at 5-10 seconds at the most (or longer if it so requires)? Maybe I am getting a bit too wordy here but to give a better picture: If the kiln were to have a window and I could see what was going on in the kiln, at what temperature would I set the kiln at so the steel is glowing yellow without melting itself for about 10 seconds. An extra tip of $5.00 will be added if you can tell me the kiln temperature to anneal many pieces of 3/32 rod of 316L stainless steel as well. | |
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Subject:
Re: Annealing temperature of soft/mild steel
From: phi-ga on 20 Feb 2003 20:18 PST |
Annealing is a process by which the crystalline structure of the iron is changed so that it is more ductile and in general easier to work with. Which I presume is Ur purpose. The Answer ure looking for.. is 793 C .(go higher than 900 and it begins to melt which u don't want to do ) This link http://www.askzn.co.za/tech/tech_grade_430.htm gives the annealing temperature as 760. But that is for a specific kind of steel and u are I presume asking for a general temperature range for mild steel. So u should be alright when u get close to that temperature with in 5 - 10 degrees In the process for annealing. U should heat the steel up to the required temperature range and let it cool down as slowly as possible (at a controlled rate of say 5 degrees per minutes. The best way would be to heat it up to the required temperature. Let it sit there at that temperature so that ALL the material is at an even temprature.and then let it cool down in the oven. This would work if ure doing small batches. IF how ever u need a faster pace there are various commercial immersion mediums available which u can use. Or also u could make steel cases made from a higher grade of steel in which u would place the rods and heat them and take the case out of the oven so that u can put in the next batch. There was a very good book on available for general workshop practices and metal treatment. One of them I remember was " Manufacturing processes" By Myron L. Begeman U should be able to find it its pretty much a standard textbook. If not u can find it at Amazon for sure Oh for the kiln. U shouldn't have to peek thru the window. It should have a thermometer. And then when it reaches that temperature. U should leave it at that temperature for 30 - 40 minutes so that the temperature gets evenly distributed. And then let it cool down for desired rate. Also remember If ure heating a larger batch u have to let it heat up slowly also Because other wise the outer material will heat up to a higher temrature while the material on the inside will not be at the right temperature. If u buy a specific steel. Ur supplier should be able to supply u with the steel's annealing. and hardening temperatures. |
Subject:
Re: Annealing temperature of soft/mild steel
From: ganoksin-ga on 25 Apr 2003 19:32 PDT |
Hi firebreather-ga ; Discussions over working with mild steel took place few times over the last few years at the Ganoksin's Orchid forums. You can retrieve the threads by running a keyword search. Check out the following address to learn more: http://www.ganoksin.com/orchid/archive/ Here are some pointers: Mild steel? http://www.ganoksin.com/orchid/archive/9812/msg00042.htm Working with steel in jewelry http://www.ganoksin.com/orchid/archive/200208/msg00328.htm Hope it helps Hanuman --------------------------- http://www.ganoksin.com Ganoksin is an online meeting space whose mission includes fostering sharing and community, enhancing productivity and safety by advancing education in the jewelry and metal arts globally. |
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