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Introduction to high speed steel

Introduction to high speed steel

2020-04-29

Tool steel with high hardness, high wear resistance and high heat resistance, also known as high speed tool steel or front steel.High speed steel was invented in 1898 by Taylor, F.W. and m. white of the United States.High speed steel has good technological performance, good strength and toughness, so it is mainly used to manufacture complex thin edge and impact resistant metal cutting tools, but also can manufacture high temperature bearings and cold extrusion mold.In addition to the high speed steel produced by smelting method, the powder metallurgy high speed steel appeared after the 1960s.

Type of high speed steel is a complex type of steel with a carbon content of 0.70 ~ 1.65%.The amount of alloying element is large, the total amount can reach 10 ~ 25%.According to the different can be divided into: tungsten alloy elements contained high speed steel; tungsten molybdenum (tungsten 9 ~ 18%) of high speed steel (including tungsten, molybdenum, 2 ~ 5 ~ 12%, 6%); high molybdenum high speed steel (including tungsten, molybdenum 5 0 ~ 2% ~ 10%), vanadium high speed steel, and different points of the vanadium content in vanadium content (containing vanadium 1 ~ 2%) and high vanadium content (2.5 ~ 5%) containing vanadium high speed steel; cobalt high speed steel (containing cobalt 5 ~ 10%).According to the different USES of high speed steel can be divided into general and special purpose two.General high speed steel: mainly used for the manufacture of cutting hardness HB ≦ 300 metal material cutting tools (such as drill, tap, saw blade) and precision tools (such as hob, gear shaper, broach), commonly used steel Numbers have W18Cr4V, W6Mo5Cr4V2, etc.Special purpose high speed steel: including cobalt high speed steel and super hard high speed steel (hardness hrc68-70), mainly used for the manufacture of cutting difficult metal (such as high temperature alloy, titanium alloy and high strength steel, etc.) cutting tools, commonly used steel grades have W12Cr4V5Co5, W2Mo9Cr4VCo8, etc.

Properties in the manufacture of cutting tools from high speed steel, in addition to its high hardness, high wear resistance and sufficient toughness, an important factor is the red hardness.Red hardness refers to the ability of the blade to resist softening in red heat when cutting at high speed.One way to measure red hardness is to heat the steel to 580 ~ 650℃, keep it warm for 1 hour, and then cool it down.

The quenching temperature of high speed steel is generally close to the melting point of steel, such as tungsten high speed steel is 1210 ~ 1240℃, high molybdenum high speed steel is 1180 ~ 1210℃.After quenching, it is generally required to temper 3 times between 540 ~ 560℃.Increasing the quenching temperature can increase the red hardness of steel.In order to improve the service life of high speed steel tool, its surface can be strengthened, such as low temperature cyanide, nitriding, sulfur-nitriding, etc.Tool steel with high hardness, high wear resistance and high heat resistance, also known as high speed tool steel or front steel.High speed steel was invented in 1898 by Taylor, F.W. and m. white of the United States.High speed steel has good technological performance, good strength and toughness, so it is mainly used to manufacture complex thin edge and impact resistant metal cutting tools, but also can manufacture high temperature bearings and cold extrusion mold.In addition to the high speed steel produced by smelting method, the powder metallurgy high speed steel appeared after the 1960s.

Type of high speed steel is a complex type of steel with a carbon content of 0.70 ~ 1.65%.The amount of alloying element is large, the total amount can reach 10 ~ 25%.According to the different can be divided into: tungsten alloy elements contained high speed steel; tungsten molybdenum (tungsten 9 ~ 18%) of high speed steel (including tungsten, molybdenum, 2 ~ 5 ~ 12%, 6%); high molybdenum high speed steel (including tungsten, molybdenum 5 0 ~ 2% ~ 10%), vanadium high speed steel, and different points of the vanadium content in vanadium content (containing vanadium 1 ~ 2%) and high vanadium content (2.5 ~ 5%) containing vanadium high speed steel; cobalt high speed steel (containing cobalt 5 ~ 10%).According to the different USES of high speed steel can be divided into general and special purpose two.General high speed steel: mainly used for the manufacture of cutting hardness HB ≦ 300 metal material cutting tools (such as drill, tap, saw blade) and precision tools (such as hob, gear shaper, broach), commonly used steel Numbers have W18Cr4V, W6Mo5Cr4V2, etc.Special purpose high speed steel: including cobalt high speed steel and super hard high speed steel (hardness hrc68-70), mainly used for the manufacture of cutting difficult metal (such as high temperature alloy, titanium alloy and high strength steel, etc.) cutting tools, commonly used steel grades have W12Cr4V5Co5, W2Mo9Cr4VCo8, etc.

Properties in the manufacture of cutting tools from high speed steel, in addition to its high hardness, high wear resistance and sufficient toughness, an important factor is the red hardness.Red hardness refers to the ability of the blade to resist softening in red heat when cutting at high speed.One way to measure red hardness is to heat the steel to 580 ~ 650℃, keep it warm for 1 hour, and then cool it down.

The quenching temperature of high speed steel is generally close to the melting point of steel, such as tungsten high speed steel is 1210 ~ 1240℃, high molybdenum high speed steel is 1180 ~ 1210℃.After quenching, it is generally required to temper 3 times between 540 ~ 560℃.Increasing the quenching temperature can increase the red hardness of steel.In order to improve the service life of high speed steel tool, its surface can be strengthened, such as low temperature cyanide, nitriding, sulfur-nitriding, etc.


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