Heat Transmission Coefficients for Metals

**Heat Transmission Coefficients for Metals**
Fluid 1	Material	Fluid 2	Watts/m²·°C	Btu/ft²·hr·°F
Water	Cast iron	Air or Gas	8.0	1.4
Water	Mild steel	Air or Gas	11.0	2.0
Water	Copper	Air or Gas	11.0	2.25
Water	Cast iron	Water	220 to 280	40 to 50
Water	Mild steel	Water	340 to 400	50 to 70
Water	Copper	Water	350 to 450	62 to 80
Air	Cast iron	Air	6.0	1.0
Air	Mild steel	Air	8.0	1.4
Steam	Cast iron	Air	11.0	2.0
Steam	Mild steel	Air	14.0	2.5
Steam	Copper	Air	17.0	3.0
Steam	Cast iron	Water	900	160
Steam	Mild steel	Water	1050	185
Steam	Copper	Water	1170	205