4130 Quenched R> 85/100 daN/mm¦ 4

[hunter01]

Hi,
I have an Italian print that uses 4130, the problem I have is in the legend it calls out for: “Stato fornitura Mat- Bonificato R > 85/100 daN/mm²” when I Google it I come up with: State provision Mat- Quenched R> 85/100 daN/mm²

I know it has to do with the Tensile Strength of the material but can someone tell me exactly what it means?

Thanks

 

[redpicker]

85-100 daM/mm^2 equals 123275 - 145030 PSI.
If you know this is the tensile strength range, than that would be your range. I am not sure if "R" designates ultimate tensile or yield strength.

rp

 

[CoryPad]

R_m is ultimate tensile strength and R_p is the yield strength.

 

[metengr]

I have seen R_{p 0.2} expressed as yield strength, and as corypad mentioned R_m as ultimate tensile strength.

 

[vthomidis]

hunter01,

"Stato fornitura mat-bonificato" means :
"supplied material condition : quenched"
( possibly Q+T, annealed , normalized - depending on shape of
steel )

85/100 daN/mm2 means : 850/1000 N/mm2
i.e. most possibly our Italian friends mean to say :

R(yield) > 850 N/mm2 / R(tensile) > 1000 N/mm2

Above values are in the range expected for steel material after heat treatment (quenching or....)

 

[RPstress]

daN/mm² are also known as hectobars (hbar), as used for design of the EH101 helicopter (maybe it's used a bunch for stuff outside aerospace?). It's a rarely used stress unit in my experience, and it's similarity to kg/mm² was both occasionally dangerous and vaguely convenient.