material they use, generally it is from SA29, AISI 4140..._), one need
to specify and MDMT and energy requirements while ordering.
Haldor Topsoe spec recommends DIN17290/26CrMo4/1.7219 for -11 to -60
deg.C, may check the equivalents as it is a very old one and the std
might be obsolete now.
Please share other alternate/equivalent standards for LT application
-----Original Message-----
From: PED2000@googlegroups.com [mailto:PED2000@googlegroups.com] On
Behalf Of Rajesh
Sent: Wednesday, July 09, 2008 8:25 PM
To: Process Equipment Design
Subject: [PED:102] Bolting Materials For ASME & PED
Dear All,
Many a times I face a problem of Selecting Bolting Material Impact
tested as per PED ( i.e. with 54J Energy at Lowest Schedule operating
temperature).
Let me know which material is best when I shall be using it for (-) 25
Deg C
As I understand SA193 Gr B7 which is readilly available cannot give
52J below 10 Deg C. EN19 is preferred material for this before Heat
treatment.
If I am correct,SA320 Gr L7 which is gives 52J below -25 Deg C. But
what shall be raw material for this grade before heat treatment.
Regards
Rajesh Bhavsar
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