SKD11 Lost Wax Investment Casting

Product Introduction

SKD11 is a general-purpose cold work die steel with high wear resistance and toughness, high carbon, and high chromium alloy tool steel, and vacuum-degassed refined steel. The steel is pure and has good hardenability and small quenching deformation. This steel has been softened by spheroidizing annealing and has good processability. The carbide particles are fine and uniform, so there is no need to worry about quenching cracking due to the special addition of strengthening elements molybdenum and vanadium.

Function

SKD11 is produced by Hitachi and Datong Steel Plant. The trade name of Hitachi's SKD11 is SLD (the latest improved version is called SLD-MAGIC), and the Datong Steel Plant's trade name is DC11. Both have factories in mainland China, are the most well-known in the industry, and have the highest prices. This steel is an air-cooled hardening cold work die steel widely used internationally. Smelted in an electric furnace and re-dissolved by electro slag, it has high purity, better toughness, uniform structure, good high-temperature strength, toughness, and high-temperature fatigue resistance, and can withstand sudden changes in temperature.

High hardness and high wear resistance. The eutectic carbide is uniform, has good toughness, and is not easy to crack. The hardness after quenching is >62HRC. The nitriding treatment time at 525°C is 20h/30h/60h, and the nitriding layer depth is 0.25mm/0. 30mm/0. 35mm, and the part surface hardness is 1250HV; the nitriding treatment time at 570°C is 2h, and the nitriding layer depth is 10~ 20μm, part surface hardness is 950HV.

Corresponding Brand

China GB standard grade Cr12Mo1V, China Taiwan CNS standard grade SKD11, German DlN standard material number 1.26o1, German DIN standard grade x165CrMoV12, Japanese Jis standard grade SKD11, Korean Ks standard grade STD11, Italian UN1 standard grade x165CrM0W12KU, Swedish SS standard grade 2310, Spanish UNE standard grade X160CrM0V12, American AISi/sAE standard grade D2, Russian roCT standard grade x12M.

Characteristic

1. Good high-temperature strength and toughness, good wear resistance, and easy to cut;

2. SKD11 lost wax investment casting is a kind of cold mold steel with high strength, toughness, and heat resistance balance. In recent years, with the development of isotropic products, it has increasingly developed into high toughness and other aspects. It can extend the life of the mold. It is longer, has more stable performance, is easy to process, and has small heat treatment deformation.

Features

(1) Vacuum degassing and refining are carried out, so the internal quality is extremely clean.

(2) Good machinability.

(3) The hardenability is good and can be hardened by air cooling without worrying about quenching cracks.

(4) The heat treatment deformation is very small, and the quenching deviation is extremely small, which is most suitable for molds with precision requirements.

(5) It has excellent wear resistance and is most suitable for use as a punching die for stainless steel or high-hard materials.

(6) Good toughness.

Cryogenic Treatment

In order to obtain the highest hardness and dimensional stability, the mold is cryogenically cooled at -70 degrees Celsius to -80 degrees Celsius immediately after quenching, kept for 3-4 hours, and then tempered. The hardness of the cryogenically treated tool or mold is 1 higher than that of conventional heat treatment. -3HRC. For parts with complex shapes and large changes in size, there is a risk of cracking during cryogenic treatment.

Nitriding Treatment

After the nitriding treatment of the mold or workpiece, a layer of hardened structure with high hardness and certain corrosion resistance is formed on the surface.

• Nitriding at 525°C

The surface hardness of the workpiece is about 1250HV. The effect of nitriding time on the nitrided layer is shown in the table below. Nitriding time (hours) 20 30 60 Nitriding layer depth mm 0.25 0.30 0.35

• Soft nitriding treatment at 570℃

The surface hardness of the workpiece is approximately 950HV. Usually, the soft nitriding treatment takes 2 hours, and the depth of the hardened layer can reach 10-20um. Grinding the mold base or working in a low-temperature tempering state is prone to grinding cracking. In order to prevent the occurrence of cracks, small grinding feeds should be used for multiple grinding times, and good water cooling conditions should be added.

When molds with complex shapes or large sizes are processed by wire cutting, cracking will usually occur when the molds are finally processed by wire cutting.

In order to prevent cracking, it is recommended to use gas quenching and high-temperature tempering to reduce heat treatment stress, or to perform cavity preprocessing on the mold base.

Heat Treatment

Quenching: Preheat to 700~750℃ first, then heat to 1000~1050℃ and cool in still air. For steel tools with a thickness of more than 6 inches, it is better to heat them to 980~1030℃ and quench them in oil.

Tempering: Heating to 150~200℃, staying at this temperature, and then cooling in still air.

Hardness: HRC 61 or above.

Annealing: Heat to 800~850℃, stay at this temperature for 1~3 hours, and let it gradually cool down in the furnace.

Forging: 1050～950℃.

Quenching and tempering specifications

The quenching temperature is 1010°C, air cooling. The tempering temperature is 200°C, hardness is 58~60HRC.

Detection Systems

Copper Silica Sol Investment Casting