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What is SKD11 steel? What are the application ranges of SKD11 steel?

Posted by: steel world 2023-10-06 Comments Off on What is SKD11 steel? What are the application ranges of SKD11 steel?

China GB standard grade Cr12MoV, China Taiwan cNS standard grade SKD11, German DlN standard material number 1.26o1, German DIN standard grade x165CrM0v12, 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 D3, Russian roCT standard grade x12M.

Highly wear-resistant general-purpose cold work die steel; good quenching properties and less heat treatment deformation. Purpose: This carbon steel snake spring is easy to turn and suitable for making sharp knife edges, scissors, circular saws, cold or hot dressing dies, roller edges, screw threads, wire dies, milling cutters, impact dies, round rollers, punching dies for power transformers, and cutting. Steel sheet rolling knives, steel pipe forming rollers, special forming rollers, precision gauges, cold pressing tools with complex shapes, mandrels, metallurgy, tin molds, plastic molds, screw head molds, etc.

SKD11 is a Japanese JIS standard grade. It is a general-purpose cold work die steel with high wear resistance and toughness, high carbon and high chromium alloy tool steel and vacuum degassing refined steel. The SKD11 steel is pure, has good hardenability and small quenching deformation. Good quenchability. This steel has been treated by spheroidization, demineralization and softening, and has good processability. The carbide particles are fine and uniform, and there is no need to worry about the continuous addition of molybdenum and vanadium, which are strengthening elements for quenching and cracking. High hardness, high wear resistance, uniform eutectic carbide, high toughness, not easy to crack, hardness after quenching >62HRC. Nitriding treatment at 525℃, the time is 20h/30h/60h, the depth of ammonia layer is 0.25mm/0. 30mm/0. 35mm, the surface hardness of the workpiece is 1250HV; the nitriding time at 570℃ is 2h. Nitridation layer Depth 10~20μm, workpiece surface hardness 950HV1. Used in “quenching + tempering” state

2. Used in the “quenching + cold treatment + tempering” state (suitable for high precision and dimensional stability requirements)

3. Used in the “quenching + tempering + nitriding treatment” state (suitable for high surface hardness requirements)

4. 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 tools or molds is higher than that of conventional The heat treatment hardness is 1-3HRC. For parts with complex shapes and large changes in size, there is a risk of cracking during cryogenic treatment.

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

6. During nitriding treatment at 525℃, the surface hardness of the workpiece is about 1250HV. The effect of nitriding time on the carburized layer is as shown in the table below. Nitriding time (hours) 20 30 60 Nitriding layer depth mm 0.25 0.30 0.357. After soft nitriding treatment at 570℃, the surface hardness of the workpiece is about 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.

Quenching: First preheat to 700~750℃, 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 to 980~1030℃ and quench in oil.

Tempering: Heating to 150~200℃, staying at this temperature, and then cooling in still air. Hardness: HRC61℃ 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℃.

[1]1) Used for making molds, shears, circular saws, metal stamping dies, and forming rolls

2) Make cold or hot working trimming dies, roller edges, silk patterns, wire dies, transformer core punching dies,  steel machining, steel pipe forming rollers, special forming barrels, nail head dies, etc.

3) High-efficiency blanking dies, punching dies, and stamping dies for thin steel plates with thickness ≤6mm

4) Various cutting dies, inlay dies, and thread rolling dies.

5) Slider-resistant cold heading dies, deep drawing dies, and cold extrusion dies.

6) Thermosetting resin mold, general plastic mold.

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