Shock-Hardening Techniques Technology ID
The research ID for Shock-Hardening Techniques in Hearts of Iron IV is sp_shock_hardening_techniques.
Shock-Hardening Techniques

Artillery1941
Unlock this technology with the research command and the tech ID sp_shock_hardening_techniques.
About this technology
By using various Shock-Hardening Techniques, and utilizing stress equalizers for our components, we lowered the rate of premature detonations, making our projectiles more reliable and effective