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CPM Rex 45
2015-11-09 14:45:47   Source:www.hspecialsteel.com   Criticism:0 CTR:

This is powder metallurgy high speed tool steel in the United States by ASTM standard, we can produce plate, flat, belt, sheet, wire coil, square bar, round rod, pipe,forged valve body, forged rings, forged multidiameter shafts etc for this steel
Steel Grade : CPM Rex 45
Equivalently AISI :
     
CHEMICAL COMPOSITION
C(%) : 1.3
Cr(%) : 4
W(%) : 6.25
Mo(%) : 5
V(%) : 3
Co(%) : 8.25
Other(%) : S0.03
Hardness HRC : 66~68
     
Remark    
①, The steel grade suffix HC-->High carbon, HS-->High sulphur.


 

Introduction High Speed Tool Steel
High speed tool steel is mainly used in manufacturing high efficient cutting tool.Due to its high red hardness, good abrasion resistance, high strength characteristics, and also used in the manufacture of high performance requirements of the mould, and hot spring roll, high temperature bearing, etc.The use of high speed tool steel after heat treatment the hardness can reach more than HRC63, under the working temperature of 600 ℃ can still maintain a high hardness, but its toughness, wear resistance and heat resistance are good.Annealing state of high speed tool steel main alloy elements tungsten, molybdenum, chromium, vanadium, and some joined the cobalt in high speed tool steel, aluminum and other elements.
The main performance
Process performance is also an important index of high speed steel.First of all, should have good thermoplastic, in order to fully broken eutectic carbide and processing forming;Next, want to have low annealing hardness, so that in the process of production of cold forming and machining.Other process performance, such as overheating insensitivity and decarburization insensitivity, low quenching deformation, with the handle in the resistance welding and friction welding of carbon steel in combination with good welding performance is also very important, such as grinding, especially for manufacturing complex cutting tool is extremely important.
Physical properties
hardness
Tool steel tool which has a high enough hardness after heat treatment, such as metal cutting tools used in general above HRC60.Cutting tool in high speed machining hard materials produced by high temperature and heat conditions, can still maintain a high hardness and good red hardness.Carbon tool steel and alloy tool steel is generally in 180 ℃ ~ 250 ℃, high-speed tool steel under the working temperature of 600 ℃ or so, still can maintain higher hardness.For thermal deformation of mould red hardness and high speed cutting tool steel is very important for performance.
Wear resistance
Tool steel has good wear resistance, resistance to wear and tear.Tools under considerable pressure and friction conditions, can still maintain its shape and size remains the same.
Strength and toughness
Tool steel has a certain strength and toughness, make the tools in the work to withstand the load, shock, vibration and bending and other complex stress, to ensure the normal use of tools.
Other performance
Due to the various tools of different working conditions, tool steel also has other properties, such as mould steel should also have a certain high temperature mechanical properties, thermal fatigue, thermal conductivity and wear-resisting corrosion resistance, etc.
Process performance
Tool steel in addition to the above performance, but also should have good process performance.
(1) workability
Tool steel should have good thermal pressure processing performance and machining performance, to guarantee the manufacture and use tools.The processability of steel depends on chemical composition, the quality of the organization.
Quenching temperature [2] the broadness
Tool steel, the quenching temperature should be wide enough to reduce the possibility of overheating.
(3) the hardenability and hardenability
Hardenability is steel after quenching can achieve the performance of the highest hardness.Hardenability is mainly associated with the chemical composition, especially the carbon content of steel, the carbon content is higher, the higher the hardenability of the steel.
Steel hardenability said after quenching hardness distribution from surface to inner.The discretion of the hardenability and chemical composition of steel, purity, grain size.
According to different tools, used in the manufacture of the two kinds of performance have certain requirements.
(4) the decarburization sensitivity
Tool surface decarburization, will make the surface hardness is reduced, so the requirement of the steel decarburization sensitivity was low.In the same condition, the steel decarburization sensitivity depends on its chemical composition.
(5) heat treatment deformation
Tools during heat treatment, for its size and shape stability.
The cutting resistance
(6)For manufacturing cutting tools and measuring tool steel, require good grinding.Grinding and its chemical composition of steel, especially vanadium content, if the vanadium mass fraction is not less than 0.50% of the grinding gone bad.

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