need info about frames

motoarmageddon
Edited Date/Time 1/23/2012 11:49pm
Does anyone know if the last years of japanese steel frames were chromoly or just regular steel? Like an 08 Rm250 2 stroke? or the KX 250
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xnationalwrench 12/11/2010 2:04pm
12/11/2010 2:04pm
Japanese Steel, I have been told by experts that they use a different rating system for their steel & aluminum.
Erick
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Erick 12/12/2010 6:20am
12/12/2010 6:20am
KTM uses 25CrMo4 for their frames. Which has the DIN code 1.7218, if you have any literature you may be able to find the Japanese code for it. I think the Japanese use a very similar steel. So this may give you an indication.

http://www.matbase.com/material/ferrous-metals/cast-steel/gs-25crmo4/pr…

Just out of curiosity, why do you ask? Are you an engineer?
Erick
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Erick 12/12/2010 6:28am
12/12/2010 6:28am
I believe the steel is called AISI-SAE-4130 Steel. It is very suitable for massproduction because it mostly doesn't require any heat treating after welding. And you can weld it with TIG and MIG using appropriate welding 'wire' (not sure what the right word is).
ehr400
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ehr400 12/12/2010 7:32am
12/12/2010 7:32am
Erick wrote:
I believe the steel is called AISI-SAE-4130 Steel. It is very suitable for massproduction because it mostly doesn't require any heat treating after welding. And you...
I believe the steel is called AISI-SAE-4130 Steel. It is very suitable for massproduction because it mostly doesn't require any heat treating after welding. And you can weld it with TIG and MIG using appropriate welding 'wire' (not sure what the right word is).
x2

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