The area of concern would be under the bolt head and nut washer areas. Being a hammerite finish, it has little mountain and valley areas the washer rests on.
The powdercoating possibly being strong enough to support bolt torque. Now add stresses/load/impacts from driving use, whether normal or performance driving, can cause that hammerite finish (mountain tops) to compress and essentially loosen those bolts.
If you torqued them already you might want to take one off and examine underneath the washer and see if it squashed the finish flat or not. If it did you should be fine.
If it didn't under torque alone, it is of some concern. Imagine all those bolts loosening a little. That little movement, multiplied, that's a lot of slop. In addition, adding shock/impact stress loads to those bolts and bolt holes.
Just something to look at, being that steering is a critical component.