German mat'l code for bolts and gaskets
German mat'l code for bolts and gaskets
(OP)
I have a PV built in Germany in 1975; for bolt spec's they show 'DIN931, 24CrMo5'. What would be the equivalent ASME material?
For gasket, they show 'Jt300'only, and its thickness is 1mm.
What would be its m and y factors?
Thank you.
For gasket, they show 'Jt300'only, and its thickness is 1mm.
What would be its m and y factors?
Thank you.





RE: German mat'l code for bolts and gaskets
Speaking of the steel alloy, are you sure it is "24CrMo5"? This grade is referenced in an Austrian standard, but the grade "25CrMo4" is a standard grade referenced across Europe (EN 10083-1). Not that it really matters, as they are almost identical. The composition of 24CrMo5 is as follows:
C = 0.20-0.28
Si = 0.40 max
Mn = 0.50-0.80
P = 0.030 max
S = 0.035 max
Cr = 0.90-1.20
Mo = 0.20-0.35
I am not familiar enough with ASME standards to recommend an equivalent product standard for fasteners. I can tell you that there are a number of ASTM standards for steel fasteners, and none of them has a direct equivalent for this steel composition, as a Cr-Mo alloy with only 0.25 nominal C is not a standard in the U.S. However, mechanical properties are the most important feature, not chemical composition, which means that an appropriate fastener standard like ASTM A 962M - 01 Standard Specification for Common Requirements for Steel Fasteners or Fastener Materials, or Both, Intended for Use at Any Temperature from Cryogenic to the Creep Range will provide the necessary details.
RE: German mat'l code for bolts and gaskets
It 300 is compressed asbestos. Not allowed anymore , but
m = 2.75 to 3.5
y = 3700 to 6500 psi
RE: German mat'l code for bolts and gaskets
RE: German mat'l code for bolts and gaskets
at Room temp. : 15950 psi
at 400 Deg. C : 11020 psi.
It300 is not solid metal but solid asbestos.