Materials specs and properties 3

[PrImpEng]

Hi folks first post beers on me!.

I have been handed a note from my manager asking for some info on:-

1 A Cast Iron the grade on the drawing is 500/7 and a supplier has recommended 600/3. What do these numbers mean please? Or where can I find a table of properties etc? I'm not sure of composition for this one.

2 We have a 'Unified Number' for a carbon steel it is G10210, although I have an list of ASTM numbers Boss wants a BS number or cross ref list (for both). Composition is

C 0.18-0.23
Mn 0.60-0.90
P 0.04 max
S 0.05 max

Thanks

 

[CadAndy]

Try

http://www.matweb.com

and under search type
G10210. If you don't have the internet
then try 1021.

Not know the size and purpose of what your
looking the web site will help you better
and you can print out the information
you need.

Andy Kaczmarek

 

[TVP]

The UNS designation is for an alloy typically called 1021 in the U.S. SAE J403 is the standard specification for the chemical composition of carbon steel grades like 1021. The equivalent BS spec would be BS 970, grade 070M20. SAE 1021 steel is often aluminum killed for grain refinement, but this is not specifically addressed in SAE J403.

I have a question for you regarding the cast iron designations. Are you sure that they aren't supposed to be:

60-03
and
50-07

The reason I am asking is because ASTM A 536 Standard Specification for Ductile Iron Castings references grades as follows:

80-60-03, which means 80 ksi tensile strength (550 MPa), 60 ksi yield strength (410 MPa), and 3% minimum elongation. 70-50-05 is the next standard grade, then 60-42-10.

 

[arunmrao]

Yes TVP is right. The mechanical properties are given as grades. Tensile strength followed by elongation. But I doubt it being cast iron. It must refer to Ductile iron. Cast iron cannot have such high strength values and also a elongation of 7%. Hope this helps.

 

[PrImpEng]

Thank you very much folks I will pass this information on. As for 500/7 being 50 07 etc it is possible I will ask the person that gave me the basic info.

Thanks again.

 

[lgearhart]

Folks, since PrImpEng asked for a British equivalent of 1020, I'd tend to assume the 500 and the 600 were MPa. That would give tensile strengths of roughly 72 and 87 ksi, which sound reasonable, and achievable, for cast iron.

In any case, I think that TVP and arunmrao are correct, and that the numbers refer to ductile (aka nodular, aka spheroidal) iron, a grade of cast iron containing additives that make the graphite clump into round aggregations. PrImpEng, if you check with a local iron foundry, they should be able to enlighten you on the callout choices.

Good luck!