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Buying AISI 304
2

Buying AISI 304

Buying AISI 304

(OP)
Hello,

I am an German Engineer who is looking for AISI 304 (1.4301) X5CrNi18-10 with minimum tensile strength 1350 N/mm².
The stainless steel is for disc springs with material thickness more than 3mm (to DIN EN 10258=cold rolled steel)
Unfortunaltely I only need small quantities for a first trial (< 2 ton.).
Does anyone have an idea where I can buy such quantieties ?

RE: Buying AISI 304

What's your location?

In the US any metal service center would be able to get this in sheet form.  Might have to have a little lead time. They could also supply secondary operations, cut to size.

When we had a facility in Europe we used several centers in Belgium and the UK.    

RE: Buying AISI 304

You might want to try your local Sandvik Materials Tech. Service center. Their grade of 304 is called 11R51.

RE: Buying AISI 304

I have used Ulbrich and Allegheny Technologies for small quantities.

RE: Buying AISI 304

Is this a specified strength level in EN10258?
The ASTM A666 that covers cold rolled strip and sheet lists strength levels up to 1035MPa for 304 and up to 1275MPa for 301 and 302.
This could be tough especiall since you are looking for thick material (for hard strip).

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm

RE: Buying AISI 304

(OP)
Thanks for all your help. Sandvik might be a could adress. My problem is to find a corrosion resistant cold rolled strip or sheet steel for thicknesses bigger than 2,5mm with tensile strength > 1300 N/mm².
The purpose is to produce disc springs to AISI 304.

I would be gratful for any further help or comments.

RE: Buying AISI 304

The only way that I know how to get that strong at that thickness is to use a PH grade.  It might be possible with 201 or 202, or maybe better yet 2101 duplex.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm

RE: Buying AISI 304

I still think a producers service center is your best approach.

Here is another reference to spring temper.

http://www.smt.sandvik.com/sandvik/0140/internet/se01596.nsf/GenerateFrameset1?readForm&url=http://www.smt.sandvik.com/sandvik/0140/internet/se01596.nsf/(DocumentsInternetWeb)/09D082C83C0D8E6741256713003A4C40

You might talk to some suppliers like the following that could make the reduction needed to achieve the temper need for your hardness.  The reduction of 304 is keep to certain levels as bending becomes a problem at 1/2 hard and above.   I think companies do inadvertently produce 304 to your hardness specification but anneal it.       
 
http://www.tctstainless.com/AboutUs/index.html

RE: Buying AISI 304

DISCMAN,
How much deforming of the disc are you going to do to make the spring?  You might exceed your desired strength.

When I made HP rupture discs it took very little work to get a micro hardness equivalent to what would convert to over 200,000 psi tensile strength.  This was on the conservitive side. This was an inverse relationship with the thickness of the starting material.  The thickest material I worked with was .5 mm     

I'm looking around for the material we used on diaphragm pumps that had a very high tensile strength.

RE: Buying AISI 304

DISCMAN
  I need to do some calculations, but I fear it will be very difficult for you to find the strength level you want in this thickness of 304. It requires a very large reduction by cold rolling. That means that the starting thickness must be over double your final thickness to get enough cold work. Few producers can start with annealed coils over 6 mm in their cold roling mills.
  My data shows an 18-8 alloy getting to only 190,00 psi tensile strength after 50% cold reduction. If you could use 301, which requires less coldwork to attain high strength, you would have a much easier time getting the material you need. Since you need it in such small quantities, you'll have to get a fairly standard product, which 304 in this strength and thickness is not. It would be much easier in 301.

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