W. NR. 1.2344
Chrome–molybdenum–vanadium-silicon steel for hardening in oil and in air with very good hardenability (the steel is hardened in the whole cross-section up to the diameter of about 150 mm), high firmness during the heat and resistance to the tempering and the wear (higher than by the steel 1.2343), very good toughness and plastic properties during normal and also higher temperatures. Further the steel has a very good resistance to tearing of thermal fatigue (lower than by the steel 1.2343) and higher sensitivity to quick changes of temperature than by the steel 1.2343. The steel is suitable for the heat treatment also for firmness over 1765 N/mm2 and for tools cooled by water. It is well-workable during the heat and well-workable in the soft-annealed state.
Tools for hardening during the heat such as small swages for forging presses, matrixes, swage inserts, upsetting tools, punching thorns, jaws and punches. Further the steel is suitable for the extrusion of components from light alloys during the heat and for highly stressed molds for pressure casting of alloys of aluminium and zinc, firm and movable parts meeting the liquid metal, inserts of functional parts of core molds, inlet cases, slide-valves, dividers etc. The steel can also be used for tools for hot cutting, small and middle-sized shear blades, trimming dies and cutting thorns.
Chemical composition of steel W.Nr. 1.2344
|Steel grade||Chemical composition in %||Hardness in the state|
|C||Mn||Si||Cr||W||Mo||V||Ni max||Co||P max.||S max.||HB max.||HRC min.|
|ČSN 19 554||0,34-044||0,20-0,50||0,80-1,20||4,80-5,80||1,10-1,60||0,80-1,20||0,030||0,030||250||51|
Heat treatment of steel W.Nr. 1.2344
|Forging||900-1100||Cool slowly in dry ash or other thermally-insulated material, thick cross-sections in the furnace|
|Soft annealing||750-800||Warm few hours (according to the size of object), mostly four hours are enough and cool slowly in the furnace|
|Annealing to lower tension||600-650||Warm 1 to 2 hours and cool slowly in the furnace|
|Hardening||1020-1070||Cool smaller and simpler tools in oil up to about 100 °C, and then in air|
|Cool bigger and difficult-shaped tools in air or in thermal bath ath the temperature of 500-550 °C|
|Tempering||550-650||Cool in air, the degree of tempering is set by hardness and toughness of instrument according to the tempering chart|
Chart of tempering values depending on the hardness:
Round bars: D20,5 - D605
Blocks: 410x1010, 510x910
We will deliver any semi-finished products from the above mentioned dimensions. Other dimensions, except for given stock supplies, have to be consulted with us.