Why iron armour and machinery retained value

Schorpioen's wrought-iron belt used the same broad protective technology as HMS Warrior. Armour quality improved slowly enough for this protection to retain military value even as better guns appeared. Warrior could therefore move from capital-ship duties into cruiser and other roles instead of becoming immediately useless. Metallurgical science limited the pace of improvement, which made research investment important alongside visible armour thickness. The Dutch also kept Schorpioen's engines in good condition, preserving the machinery behind her mobility and readiness. Technological progress and routine maintenance both mattered to an ironclad's continued effectiveness.