When Zinc Coating a Cold Rolled or Hot Rolled substrate there are certain chemical requirements for the substrate.
Good galvanizing can generally be assured if the chemical content of the steel meets one of the 3 following criteria.
| 1 |
Carbon |
← .25% |
| Silicon |
← .04% |
| Phosphorous |
← .02% |
|
| 2 |
Carbon |
← .25% |
| Silicon |
between .15% and .20 % |
| Phosphorous |
← .02% |
|
| 3 |
Carbon |
← .25% |
| Silicon + 2.5 Phosphorous |
← .09% |
Notes:
The farther you can stay below the upper limits the better your success will be.
Equation 2 primarily pertains to ASTM A36 Material.
Equation 3 will allow Silicon or Phosphorous to exceed the limit in equation 1, as long as the other decreases.