ASTM A36 can be welded with E6010 as long as the preheat is in accordance with Table 3.2 for the thickness being welded. Likewise, E7018 can be used as well, but the preheat requirements are somewhat lower for a given thickness when compared to the E6010. For the thickness you mentioned, i.e., 1/2 inch, the preheat requirements are the same for both E6010 and E7018.
You still have to comply with the storage requirements of the code for the low hydrogen electrodes.
I assume you do not have to meet toughness requirements. If you do, check A5.1 to verify both electrodes can meet the toughness requirements at the temperature specified by the Engineer. If my memory serves me correctly, with toughness requirements imposed, you will have to qualify the WPS considering all the essential variables of Clause 4, including the supplementary variables for notch toughness.
Best regards - Al