Cold Rolled Steels

By TimGary (****)

Date 04-04-2005 15:48

Hello,
I'm in the middle of a Facilities Planning course at my local Community College. I've been tasked with designing a theoretical facility capable of producing 5 million clamping devices per year. The clamps are very basic, in which they are made from 2 pieces of .5" x 3" flat bar with a hollowed out round bar spacer in the center and a 3/4" bolt running through all pieces to provide tension. The customer spec for the flat and round bar materials is AISI 1020.
I am finding it difficult to locate a source for these materials without having to go to a specialty metals (high priced) supplier.

My question is:

I would like to propose to my "Customer" the option of a material change from AISI 1020 to AISI 1018, in order to save on price. However, I don't have the ASTM or AISI specs for these materials. Is there much difference between the two materials? The required strength for these clamps has not been specified, but is to be minimal. Is there some obvious reason for not making this substitution?

Thanks in advance for any comments.
Tim

By chall

Date 04-04-2005 16:09

Looking at the CASTI Black Book, 4th ed.:

1018 & 1020 are the same chemically except, carbon. 1018 has a range from 0.15 - 0.20; while 1020 has a range from 0.18 - 0.23.

1018 has a UNS of G10180, 1020 has G10200.

G10180 is included in ASTM A29, A510, A512, A513, A519, A576, A611, A635, A659, A794 & A830

G10200 is included in ASTM A29, A510, A512, A513, A519, A544, A575, A576, A635, A659, A787, A794, A827 & A830.

Charles

By TimGary (****)

Date 04-05-2005 11:30

Thanks Charles!

Tim

By G.S.Crisi (****)

Date 04-12-2005 22:34

Another difference between wealthy, rich first world countries and us, poor, third world ones !!!
Here in Brazil, all you can get is AISI 1010, 1020, 1030 and 1040. If you're lucky enough and find some supplier who's got a surplus from a previous sale, you'll be able to get also 1050 and, who knows, miracles sometimes happen, also 1060.
For us it's unthinkable to specify AISI 1018, we're not accostumed to such luxuries.
So. Mr. Gary, don't worry, there's no reason for not making the change.
Cordially
Giovanni S. Crisi
Sao Paulo - Brazil

P.S. Apart from AISI materials, here in Brazil there's a small variety of ASTM materials as well.