Recent from talks
Ducol
Knowledge base stats:
Talk channels stats:
Members stats:
Ducol
Ducol or "D"-steel is the name of a number of high-strength low-alloy steels of varying composition, first developed from the early 1920s by the Scottish firm of David Colville & Sons, Motherwell.
Applications have included warship hull construction and light armouring, road bridges, and pressure vessels including locomotive steam boilers and nuclear reactors.
The original Ducol, or "D"-steel, is a manganese-silicon steel, a toughened version of the new, proven standard construction steels developed by David Colville & Sons just after WW1.
It was an improvement on British Admiralty "HT" (High Tensile) steel, a shipbuilding and light armour steel developed c1900 and used through the end of WWI. HT was a carbon steel with a small amount of nickel, which allowed it to be hardened to a greater level without cracking (i.e. increased "toughness"). Foreign similar steels – for example, German "Low-%" Nickel Steel and U.S. High Tensile Steel (HTS) – were more complex alloys using chromium, vanadium and molybdenum.[better source needed]
Up until about 1945, Ducol generally contained only manganese and silicon as alloying elements. More recent weldable grades (Ducol W21, W25, W30, and W30 grades A & B) include varying amounts of nickel, chromium, copper, molybdenum and vanadium.
Although modern grades of Ducol are termed 'weldable', this doesn't necessarily mean 'easily weldable'. A 1970 report on an explosion in a cylinder made of Ducol 30 found that in Ducol W30, embrittlement of the heat-affected zone (HAZ) occurs in welds unless post-weld heat treatment takes place at a sufficient temperature (675C).
In addition, the original product from the 1920s was also weldable (ie 'capable of being welded'), but with dubious results. The Imperial Japanese Navy built large warships using all-welded Ducol structural elements, which swiftly led to severe problems with the Mogami-class cruisers.[citation needed]
Ducol has been used for bulkheads in both general construction and against torpedoes, and for light armour in warships of several countries, including the British, Japanese and perhaps Italian navies. After WW2 the highest grades of the commercial shipbuilding steels were based on this type of steel.
Hub AI
Ducol AI simulator
(@Ducol_simulator)
Ducol
Ducol or "D"-steel is the name of a number of high-strength low-alloy steels of varying composition, first developed from the early 1920s by the Scottish firm of David Colville & Sons, Motherwell.
Applications have included warship hull construction and light armouring, road bridges, and pressure vessels including locomotive steam boilers and nuclear reactors.
The original Ducol, or "D"-steel, is a manganese-silicon steel, a toughened version of the new, proven standard construction steels developed by David Colville & Sons just after WW1.
It was an improvement on British Admiralty "HT" (High Tensile) steel, a shipbuilding and light armour steel developed c1900 and used through the end of WWI. HT was a carbon steel with a small amount of nickel, which allowed it to be hardened to a greater level without cracking (i.e. increased "toughness"). Foreign similar steels – for example, German "Low-%" Nickel Steel and U.S. High Tensile Steel (HTS) – were more complex alloys using chromium, vanadium and molybdenum.[better source needed]
Up until about 1945, Ducol generally contained only manganese and silicon as alloying elements. More recent weldable grades (Ducol W21, W25, W30, and W30 grades A & B) include varying amounts of nickel, chromium, copper, molybdenum and vanadium.
Although modern grades of Ducol are termed 'weldable', this doesn't necessarily mean 'easily weldable'. A 1970 report on an explosion in a cylinder made of Ducol 30 found that in Ducol W30, embrittlement of the heat-affected zone (HAZ) occurs in welds unless post-weld heat treatment takes place at a sufficient temperature (675C).
In addition, the original product from the 1920s was also weldable (ie 'capable of being welded'), but with dubious results. The Imperial Japanese Navy built large warships using all-welded Ducol structural elements, which swiftly led to severe problems with the Mogami-class cruisers.[citation needed]
Ducol has been used for bulkheads in both general construction and against torpedoes, and for light armour in warships of several countries, including the British, Japanese and perhaps Italian navies. After WW2 the highest grades of the commercial shipbuilding steels were based on this type of steel.