Characteristics
Chrome-manganese-nickel-molybdenum steel for hardening in air or in oil with good hardenability and good firmness during the heat. It is well-workable during the heat and well-workable in the soft-annealed state and it has good polishability. The steel has a high ability of the heat treatment into big depths (better than W.Nr.1.2311) with the balanced process of firmness around the whole cross-section. It is appropriate for nitriding and hard-chroming.
Suitability
Mainly heat-treated to the firmness from 950 up to 1100 N/mm2 is used for big molds for plastics injection and big frames of molds.
Chemical composition of steel W.Nr. 1.2738
| Steel grade | Chemical composition in % | Hardness in state | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| soft-annealed | heat-treated | ||||||||||||
| C | Mn | Si | Cr | W | Mo | V | Ni max | Co | P max. | S max. | HB max. | HRC min. | |
| DIN 54NiCrMoV6 | 0,35-0,45 | 1,30-1,60 | 0,20-0,40 | 1,80-2,10 | 0,15-0,25 | 0.90-1,20 | 0,035 | 0,035 | 235 | 51 | |||
| ČSN is not | |||||||||||||
Heat treatment of steel W.Nr. 1.2738
| Way | Temperature [°C] | Procedure | |
|---|---|---|---|
| Forging | 850-1050 | Cool slowly in dry ash or other thermally-insulated material | |
| Soft annealing | 710-740 | 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 air or in oil | 840-870 | Cool in oil or in air at 180-220 °C | |
| Tempering | 500-600 | 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 | 600 | 700 |
|---|---|---|---|---|---|---|---|
| HRC | 51 | 50 | 48 | 46 | 42 | 35 | 28 |
| N/mm2 | 1730 | 1670 | 1570 | 1480 | 1330 | 1230 | 920 |
Graph
Product range
Blocks: 1030x1460, 1140x1280, 910x1500
Round bars: D333 - D553
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.
Tool steel meets the requirements of various kinds of tools, e.g. for machining, hot- and cold-working, measuring instruments and die-casting moulds. We also offer high-speed steel.
Tool steel meets the requirements of various kinds of tools, e.g. for machining, hot- and cold-working, measuring instruments and die-casting moulds. These tool materials conform to great quality demands of steel, like temper, strength, toughness, resistance to tempering, hardening capacity, dimensional stability, etc. The range of tool steel in our store includes products from renowned manufacturers. We also supply high - speed steel.
Special tool steel is suitable for the manufacture of moulds, dies and pressing tools. This steel have better end-use properties than common classic steel, therefore it can help saving considerable amounts of money in manufacture.
This patented Swedish steel is distinguished by its high range of use. It is suitable for the manufacture of tools and moulds as well as machinery parts. This material can replace many kinds of classic tool and structural steel.
We supply these grades of steel: St52.3, C45, 16MnCr5, 42CrMo4