Item | Carbon steel | Stainless steel | Aluminum |
/tare weight/per car | 9-10t | 6-7t | 4-5t |
material strength | normal | good | weak |
Corrosion resistance | poor | good | normal |
weight lighten | difficult | normal | good |
/ Plasticity process/forming | easy | difficult | easy |
Solderability | good | normal | normal |
material cost | low | high | high |
manufacture cost | low | highest | high |
maintenance cost | high | high | highest |
Air tightness | weak | difficult | normal |
Heat resistance | high | high | weak |
Surface protection | /need painting/ High frequency of refurbishment | /no need painting | /need painting/low frequency of refurbishment |