Rhenium density, to see the processing method. Powder molding or powder metallurgy, about 20.5g/cm3; Hot isostatic pressing or powder rolling can achieve about 20.9-21. The density of this tool is more than 2 times that of stainless steel, a 3 jin knife made with the same volume of rhenium will become 7.6 jin (the density of powder smelting is more heavy under hot isostatic pressure), so it is not suitable to make a knife. Price aspect, rhenium metal metallurgy or pressing material finished price is more than 2 times rhenium powder, if it is hot isostatic pressing or after rolling dense state rhenium material, the price will double again. Even with relatively cheap powder smelting, the price of rhenium knife still reaches more than 100RMB /g, and the cost of hot isostatic pressing compact rhenium knife will be similar to that of pure gold. Do you think you are holding a pure gold knife in your hand, so expensive price really willing to use? Said the performance, rhenium hardness is high, but not high to where.
Certain rhenium alloys have better properties, such as the addition of 5% to 10% osmium to rhenium to improve the hardness of the alloy and greatly improve its wear resistance, while ensuring a certain degree of toughness, but this is more expensive.
So, rhenium knife hardness and wear resistance of these properties can be more than martensitic stainless steel, but the cost is too high, for not much better performance to pay N times the price price, obviously not suitable. In terms of materials, it is generally to meet the minimum performance requirements, the lower the price of the material, the better. Martensitic stainless steel can achieve good performance at a lower cost, which is the main reason why it is used to do knives.
