ASTM Brass Versus JIS Brass
ASTM Brass Versus JIS Brass
(OP)
I'm running into an issue where I have a supplier telling me that they meet my ASTM B16(H02) brass but they
are using a JIS H3250 C3604. They are very similar but the JIS brass won't anneal the same as the ASTM. The differences are as follows.
ASTM Brass
Copper - 60-63 %
Lead - 2.5-3.7%
Iron MAX .35%
Zinc - Remainder
JIS Brass
Copper - 57-61%
Lead - 1.8-3.7 %
Iron+Tin - Less than 1.2%
Iron - Less than .5%
Zinc - Remainder
So my question is, given the formula of the brass, why would the JIS brass be more difficult to anneal ?
Thanks !
are using a JIS H3250 C3604. They are very similar but the JIS brass won't anneal the same as the ASTM. The differences are as follows.
ASTM Brass
Copper - 60-63 %
Lead - 2.5-3.7%
Iron MAX .35%
Zinc - Remainder
JIS Brass
Copper - 57-61%
Lead - 1.8-3.7 %
Iron+Tin - Less than 1.2%
Iron - Less than .5%
Zinc - Remainder
So my question is, given the formula of the brass, why would the JIS brass be more difficult to anneal ?
Thanks !





RE: ASTM Brass Versus JIS Brass
RE: ASTM Brass Versus JIS Brass
That's a good point. No , I have not checked the microstructure. Let me evaluate.
RE: ASTM Brass Versus JIS Brass
This could be the key as well. Some suggested reading below
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RE: ASTM Brass Versus JIS Brass
RE: ASTM Brass Versus JIS Brass
My application will require 2 machined components to be pressed together and then rolled over to captivate one of the components. The main component must be annealed otherwise cracking of the rollover will occur. My main test is that there is no cracking so the part is functional. If there is any question then the part is tested either by a crush test or through a Rockwell hardness test.
The ASTM Brass anneals per my spec. (900 deg for 15 minutes)The JIS Brass requires that I go to 1300 deg for 25-30 minutes to get the same soft properties.