Dear Mr. Shubin,
Brass 70Cu-30Zn (cartridge brass)
coefficient of thermal expansion
linear, cold rolled stock:19.9 um/m.K (11.1 uin./in.F) at 20 to 300 degree C.
Equation for 20 to 300 degree C:
where t is temperature difference from 20 degree C.
375 J/kg.K (0.09 Btu/lb.F) at 20 degree C
120 W/m.K (70 Btu/ft.h.F) at 20 degree C
for your specific range of temperature, I think you only need to extrapolate or
interpolate those data above...
Hope it will help...
Metallurgist, Bontang, Indonesia