100 tons of SUMITOMO SC1000-2 track shoe heat treatment process “four fires”

 Heat treatment can improve the hardness and toughness of the track shoe.It is an essential part of SUMITOMO SC1000-2 track shoe production. VM will introduce the heat treatment process from Normalizing, Annealing, Quenching, Tempering.

1. Normalizing

1) Definition of normalizing: Normalizing, also known as normalization, is to heat the workpiece to Ac3 (Ac refers to the final temperature at which free ferrite is completely transformed into austenite during heating, generally between 727°C and 912°C ) or Acm (Acm is the critical temperature line for complete austenitization of hypereutectoid steel in actual heating) above 30~50°C, after holding for a period of time, take it out from the furnace and cool SUMITOMO SC1000-2 track shoe in the air or by spraying water, spraying or blowing Metal heat treatment process.

2) The purpose of normalizing: ①Remove the internal stress of the material; ②Increase the hardness of the material.

3) The main application ranges of normalizing are: ① used for low carbon steel; ② used for medium carbon steel; ③ used for tool steel, bearing steel, carburizing steel, etc.; ④ used for steel castings; ⑤ used for large forgings ; ⑥ for ductile iron.

2. Annealing

1) Definition of annealing: It refers to slowly heating the metal to a certain temperature, keeping it for a sufficient time, and then cooling SUMITOMO SC1000-2 track shoe at an appropriate speed (usually slow cooling, sometimes controlled cooling).

2) The purpose of annealing: ① reduce hardness, improve machinability; ② eliminate residual stress, stabilize size, reduce deformation and crack tendency; ③ refine grain, adjust structure, eliminate structure defects; ④ uniform material structure and composition, improve Material properties or tissue preparation for later heat treatment.

3) The main application scope of annealing: ①Complete annealing is mainly used for castings, forgings and weldments of hypoeutectoid steel to eliminate structural defects, make the structure thinner and uniform, and improve the plasticity and toughness of steel parts; ②Incomplete annealing is mainly used for forging and rolling of medium-carbon and high-carbon steel and low-alloy structural steel, which makes the grains thinner, reduces hardness, eliminates internal stress, and improves machinability; ③Spheroidizing annealing is only used for The medium annealing method of steel, in which medium carbon steel and high carbon steel have low hardness, good machinability, and large cold deformation ability; The residual stress in the medium stabilizes the size and shape of the workpiece, and reduces the deformation and crack tendency of the parts during cutting and use.

 3. Quenching

1) Definition of quenching: a metal heat treatment process in which a metal workpiece is heated to an appropriate temperature and maintained for a period of time, and then immersed in a quenching medium for rapid cooling. Commonly used quenching media are brine, water, mineral oil, air, etc.

2) The purpose of quenching: to improve the mechanical properties of steel parts, such as hardness, wear resistance, elastic limit, fatigue strength, etc.; to improve the physical or chemical properties of some special steels, such as enhancing the ferromagnetism of magnetic steel and improving the resistance of stainless steel corrosion etc.

3) The scope of application of quenching: widely used in various tools, molds, measuring tools and parts that require surface wear resistance (such as gears, rolls, carburized parts, etc.). The important parts in machinery, especially the steel parts used in automobiles, airplanes and rockets, are almost all quenched.

 4. Tempering

1) Definition of tempering: tempering is generally carried out immediately after quenching, and the quenched workpiece is reheated to an appropriate temperature below the lower critical temperature, and is cooled in air, water, oil and other media after a period of heat preservation. .

2) The purpose of tempering: ① Eliminate the residual stress generated when the workpiece is quenched to prevent deformation and cracking; ② Adjust the hardness, strength, plasticity and toughness of the workpiece to meet the performance requirements; ③ Stabilize the structure and size to ensure accuracy; ④ Improve and improve processing performance.

3) Application range of tempering: tempering is divided into low temperature tempering, medium temperature tempering and high temperature tempering, among which low temperature tempering is mainly used in cutting tools, measuring tools, molds, rolling bearings, carburized and surface quenched parts, etc.; medium temperature tempering Tempering is mainly used in springs, forging dies, impact tools, etc.; high temperature tempering is widely used in various important structural parts, such as connecting rods, bolts, gears and shaft parts.

“Four fires” have evolved different heat treatment processes with different heating temperatures and cooling methods. In order to obtain a certain strength and toughness, the process of combining quenching and high temperature tempering is called quenching and tempering. After some alloys are quenched to form a supersaturated solid solution, they are kept at room temperature or at a slightly higher temperature for a longer period of time to improve the hardness, strength or electrical properties of the alloy. Such heat treatment process is called aging treatment. The method of combining pressure processing deformation and heat treatment effectively and closely so that the workpiece can obtain good strength and toughness is called deformation heat treatment; heat treatment in negative pressure atmosphere or vacuum is called vacuum heat treatment, which can not only make The workpiece is not oxidized and decarburized, the surface of the workpiece is kept smooth after treatment, the performance of the workpiece is improved, and the infiltration agent can also be used for chemical heat treatment.

We manufacture and sell track shoes, bottom rollers, top rollers, sprocket, and Idler for SUMITOMO LS78RH LS78RH5 LS78RH5 Link Type LS78RHD5 LS78RM LS98 LS108RH3 LS108RH5 LS108RH5 Link Type LS108RM  LS110C LS118 LS118RH LS118RH3 LS118RH5 LS118RH5 Link Type LS118RM LS120RH5 LS138 LS138RH5 LS138RHD LS138RHD5 LS218RH  LS218RH5 LS238 LS238RH3 LS238RH5 LS248RH5 LS368RH5 LS458HD LS468 LS468HD LS518 LS528 LS568HD LS578HD SC350 SC350 Link Type SC400 SC400 Link Type SC500 SC500 linke type SC500-2 SC500-3 SC550 SC550-2 SC600 SC650 SC650-2 SC650DD-2 SC700 SC700-2 SC700DD SC800 SC800-2 SC800HD SC900 SC1000 SC1000-2 SC1000HD SC1500 SC1500-2 SC1500HD SC2000 SC2500 SD205 SD307 SD407 SD507 SD510 SD610 SP110 SP135 ST500 SH2100-5.

Telephone: +86 535 671 0636

Mail: Parts@valuetrackpart.com

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