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The Krupp steelworks, or Krupp foundry, or Krupp cast steel factory (German: Krupp-Gussstahlfabrik [Guss+stahl+fabrik]) in Essen is a historic industrial site of the Ruhr area of North Rhine-Westphalia in western Germany that was known as the "weapons forge of the German Reich" (Waffenschmiede des Deutschen Reiches).
By the 1880s, Krupp had developed an 88mm naval gun and adopted 75mm as the caliber for the army's field and mountain guns. In 1897, when the French 75mm quick-firing gun appeared, Krupp produced the similar 77mm, which was used in World War I. Krupp mountain guns were also used during the Mexican Revolution [10] and the Spanish Civil War.
In March 1882, the 30.5 cm MRK L/35 gun barrel was tested at the artillery proving grounds in Meppen. [19] Indeed, the test of this recently completed gun was the main reason to stage a big event for artillery men from all over the world. [20] As produced, the gun barrel weighed 49,700 kg including the breech block.
Design drawing by Krupp. The development of the 40 cm MRK L/25 drew international attention even before it was tested. At the time, the British Royal Arsenal at Woolwich, and the Elswick Ordnance Company where building experimental 'Woolwich' and 'Armstrong' guns of about 81 and 100 tons for HMS Inflexible and the Duilio-class ironclads.
Krupp anticipated on the demand for an even stronger gun than the 30.5 cm by producing the first 35.5 cm Mantel Ring Kanone L/22.5 in 1875. At long ranges, 35.5 cm was designed to penetrate the 14 inch armor belts that were already in use on some ships.
The data and calculations from the 7 August 1879 test showed that the 24 cm MRK L/25.5 was exceptionally powerful, but exceptional results generally require more proof. Krupp had therefore ordered armor plates that the gun's steel projectile should be able to overcome with 11% of its power remaining after passing through. [30]
The 24 cm MRK L/30 was a Krupp naval gun developed in the early 1880s. Together with the 24 cm K L/35 , it implemented the ideas of using higher charges and longer projectiles for the Krupp 24 cm caliber.
In September 1868 [10] the trial 11-inch Ring Kanone was tested near the Krupp factory in the presence of a commission of Russian officers. The gun was mounted on a covered proving carriage. It fired solid cast iron shot into an earth butt at a distance of about 62.5 feet. One objective of this test was to investigate the durability of the gun.