| 摘要 |
The method for producing tubes for heavy guns employs a heat-treatable steel, consisting in wt.-% of 0.20 to 0.50% carbon, max. 1.0% silicon, max. 1.0% manganese, max. 0.03% phosphorus, max. 0.03% sulfur, max. 0.1% aluminum, max. 4% nickel, max. 2% chromium, max. 1% molybdenum, max. 0.5% vanadium, and the remainder of iron and the customary impurities. Forgings of open-smelted cast ingots are pre-worked on a lathe on the outside. The solid blanks obtained in this way are hardened and tempered, only subsequently drilled and then finished.
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