SKD11 is a Japanese tool steel grade, which is produced by Hitachi and Datong Steel Works. The SKD11 produced by Hitachi is called SLD (the latest improved version is called SLD-MAGIC), and the SKD11 produced by Datong Steel Works is called DC11. Both of them have factories in the mainland, which are the most famous in the industry and have the highest prices. At present, this brand is also produced in China. The steel quality is almost the same as that of Japan, but the price is very competitive.

essential information

Material grade: SKD11

Material standard: JIS G4404:2000

Material heat treatment hardness: HRC58-60

SKD11 is a kind of high carbon and high chromium alloy tool steel. After heat treatment, it has high hardness and grindability, and has the characteristics of strong hardenability and good dimensional stability. It is suitable for making high-precision, long-life cold working molds and thermosetting plastic molds.

SKD11 features: It has good toughness and high temperature fatigue resistance, can withstand temperature fusion, and is suitable for long-term work at high temperatures. It has good cutting and polishing properties.

Purpose

Thin plate with thickness no more than 6mm, efficient blanking die. Stamping die and stamping die Various scissors, inlaid blades, woodworking blades, thread rolling dies, wear-resistant slider cold heading dies, thermosetting resin forming dies, advanced gauge and other deep drawing forming and cold extrusion dies.

How to use SKD11 (for reference only)

1. Use under the condition of "quenching+tempering"

2. Use under the condition of "quenching+cold treatment+tempering" (applicable to the requirements of high precision and dimensional stability)

3. Use under the condition of "quenching+tempering+nitriding" (applicable to the requirements of high surface hardness)

4. Cryogenic treatment In order to obtain the highest hardness and dimensional stability, the die shall be cryogenic - 70 to - 80 ℃ immediately after quenching, maintained for 3-4 hours, and then tempered. The hardness of the tool or die after cryogenic treatment is 1-3HRC higher than that of the conventional heat treatment. For parts with complex shape and large size change, cryogenic treatment may cause cracking.

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

6. After nitriding at 525 ℃, the surface hardness of the workpiece is about 1250HV. The influence of nitriding time on the nitriding layer is shown in the following table. Nitriding time (hour) 20 30 60 Nitriding layer depth mm 0.25 0.30 0.35

7. After soft nitriding at 570 ℃, the surface hardness of the workpiece is about 950HV. Generally, the hardening depth can reach 10-20um after 2 hours of soft nitriding treatment When grinding die blank or working in low temperature tempering state, grinding cracks are easy to occur. In order to prevent cracks, small grinding feed shall be used for multiple grinding, and good water cooling conditions shall be added.

When the die with complex shape or large size is processed by wire cutting, the final line is processed by wire cutting, and the cracking phenomenon usually occurs.

In order to prevent cracking, it is recommended to adopt gas quenching and high temperature tempering treatment to reduce the heat treatment stress, or perform cavity pre processing on the mold embryo.

Chemical composition (%):

Carbon C 1.40-1.60

Silicon Si: 0.40

Manganese Mn: 0.50

Cr: 11.00-13.00

Mo: 0.80-1.20

Vanadium V: 0.30

heat treatment

Quenching: preheat to 700~750 ℃, then heat to 1000~1050 ℃ to cool in still air. If the steel tool thickness is more than 6 inches, heat to 980~1030 ℃ to harden in oil. Tempering: heat to 150~200 ℃, stay at this temperature, and then cool 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 in the furnace. Forging: 1050 ～ 950 ℃.