Author Topic: 303 stainless steel  (Read 325 times)

Offline Firebird

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303 stainless steel
« on: October 12, 2019, 10:14:57 AM »
Hi

I use quite a bit of stainless steel, mostly the free cutting 303. It's easily available in round and hex bar but I have never been able to find flat or square bar in 303. Is there a reason it's not available

cheers

Rich

Offline Bluechip

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Re: 303 stainless steel
« Reply #1 on: October 12, 2019, 10:27:59 AM »
Hi

I use quite a bit of stainless steel, mostly the free cutting 303. It's easily available in round and hex bar but I have never been able to find flat or square bar in 303. Is there a reason it's not available

cheers

Rich



Had 304 from here:

https://www.aluminiumwarehouse.co.uk/stainless-steel/square-bar

https://www.aluminiumwarehouse.co.uk/stainless-steel/flat-bar

Dave.

Offline jadge

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Re: 303 stainless steel
« Reply #2 on: October 12, 2019, 11:11:39 AM »
Stainless steel flats are often sheared from sheet and plate, or are rolled with poorly defined edges. Don't assume that SS flats are like cold drawn low carbon steel in section.

Andrew

Offline Jasonb

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Re: 303 stainless steel
« Reply #3 on: October 12, 2019, 01:11:11 PM »
M-Machine do 303 square section.

http://www.m-machine-metals.co.uk/mm_cat_2011.pdf

Though if you have a spin indexer it is often just as easy to mill a square provided you don't need it too long

Online crueby

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Re: 303 stainless steel
« Reply #4 on: October 12, 2019, 01:43:09 PM »
303 is available from a large number of sources in squares and flats here in the US, is it listed under a different number/name in the UK? Lots of other alloys have different naming on either side of the pond. I prefer 303 for its machining qualities over 304.


Edit: just checked, its also known as 1.4305 there, but as you said most suppliers there only carry round and hex. Odd that flats and square are available here so easily but not there.
« Last Edit: October 12, 2019, 01:52:44 PM by crueby »

Offline tvoght

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Re: 303 stainless steel
« Reply #5 on: October 12, 2019, 01:56:00 PM »
... I prefer 303 for its machining qualities over 304.

The "machinability" rating for 303 is 78% versus 45% percent for 304. This is on a scale where 12L15 (free machining leaded steel) is 193%!

--Tim

Offline TerryWerm

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Re: 303 stainless steel
« Reply #6 on: October 12, 2019, 03:15:47 PM »
There is an old saying about 303 and 304.     "304, she's a w**re, but 303, she's for me."

Then there's the world of 316. I used to work with it all the time. After getting used to machining it, the other ones are a breeze.
Terry

Making chips with old machines - there's nothing like it!

Offline Elam Works

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Re: 303 stainless steel
« Reply #7 on: October 12, 2019, 05:10:33 PM »
303 was developed as a free-machining version of 304 for screw machine and automatic lathe work. Hence the prevalence in wire and rod. However the corrosion resistance is not as good as 304, so it has not completely replaced it for all applications.

-Doug


[add corrosion comment. 12Oct19. -Doug]
« Last Edit: October 12, 2019, 07:25:50 PM by Elam Works »

Offline Firebird

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Re: 303 stainless steel
« Reply #8 on: October 12, 2019, 05:31:59 PM »
Hi

Thanks for all the replies :ThumbsUp:

Cheers

Rich