What do you mean by "not from the code book"?
To get the physical properties you should look in the code book, i.e EN 10028-6 (may be preceeded by BS, DIN etc)
To get the design stresses you should calculate those from the physical properties in accordance with the design code which in your case is probably EN13445 (the new european pressure vessel code) or perhaps EN13480 (the new european piping code)
I don't have a copy of EN10028-6, but I had a look in the Stahlschlüssel (german "key to steel" bible) - the material was listed but without physical properties.
You may anyway find use of the information that was there, including a supplier:
Search for P500QL2:
*************************************
Material Number
1.8865
Steel group
Alloy special steels: High strength weldable structural steels, steels not intended for heat treatment by user
Symbol
P500QL2
Standards
DIN EN 10028-6
(02/97) Flat products made of steel for pressure purposes. Weldable fine grain steels, quenched and tempered.
International conformity
EN 10028-6 (96)
Supplier:
********************************************
Aktiengesellschaft der Dillinger Hüttenwerke,
Postfach 15 80; 66748 Dillingen/Saar,
Tel.: (0 68 31) 47-0, Telex: 4 43 711-0 dhd, Fax: (0 68 31) 47-22 12,
E-Mail: info@dillinger.de
**********************************************
You can buy the british EN standards at
Other european versions available via
Hope this helps
Regards
Mogens