W. NR. 1.2343 ESU
Characteristics
Chrome–molybdenum–silicon–vanadium steel for hardening in oil and in air with very good hardenability, high firmness during the heat and resistance to the tempering, 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 and low sensitivity to quick changes of temperature. The steel is suitable for the heat treatment also for hardness over 1800 N/mm2 and for tools cooled by water. It is well-workable during the heat and well-workable in the soft-annealed state.
Suitability
For molds for firm and movable core parts and other parts of molds for pressure casting of aluminum alloys and large series of castings of zinc and magnesium alloys. Tools for hot mechanical working, i.e. very stressed small and middle-sized dies and inserts of dies. Dies, thorns, jaws and punches especially with the high firmness over 1800 N/mm2 cooled by water. Very stressed extruders and other auxiliary tools for extrusion of non-ferrous metals during the heat, extrusion dies for aluminum and its alloys. Tools for hot cutting, e.g. small or middle-sized shear blades, trimming dies and cutting thorns.
Chemical composition of steel W.Nr. 1.2343ESU
| Steel grade | Chemical composition in % | Hardness in the sta | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| soft-annealed | heat-treated | ||||||||||||
| C | Mn | Si | Cr | W | Mo | V | Ni max | Co | P max. | S max. | HB max. | HRC min. | |
| DIN X38CrMoV51 | 0,36-0,42 | 0,30-0,50 | 0,90-1,20 | 4,80-5,50 | 1,10-1,40 | 0,25-0,50 | 0,030 | 0,030 | 229 | 50 | |||
| ČSN 19 552 | 0,32-0,42 | 0,20-0,50 | 0,80-1,20 | 4,50-5,50 | 1,10-1,60 | 0,35-0,60 | 0,030 | 0,030 | 240 | 50 | |||
Heat treatment of steel W.Nr. 1.2343ESU
| Way | Temperature [°C] | Procedure | |
|---|---|---|---|
| Forging | 850-1110 | Cool slowly in dry ash or thick cross-sections in the furnace | |
| Soft annealing | 760-780 | 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 in oil or in air | 1000-1030 | Cool smaller and simpler tools in oil up to about 100 °C, it is more appropriate to cool bigger and more rugged tools in air | |
| Tempering | 550-650 | Cool in air, the degree of tempering is set by hardness and toughness of instrument according to the tempering chart | |
Note
Chart of tempering values depending on the hardness:
| °C | 100 | 200 | 300 | 400 | 500 | 550 | 600 | 650 | 700 |
|---|---|---|---|---|---|---|---|---|---|
| HRC | 52 | 52 | 52 | 52 | 54 | 52 | 48 | 38 | 31 |
| N/mm2 | 1790 | 1790 | 1790 | 1790 | 1910 | 1790 | 1570 | 1200 | 995 |
Product range
Round bars: D41 - 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.
