The choice of steel to mold quality and suitable for use

In molding, steel is a low hardness material, good machinability and cost. So steel is the material used as a template. Which type of steel to choose to fit each use? Let’s explore the following:

Steel for molds

In mold making, steel materials play an extremely important role in determining the quality of the mold, the quality of each product, the durability of the mold, and the cost to be paid. other materials.

With low hardness steel, machining mode is easy, less tool wear, polished to cool easily, but the surface will not achieve high gloss. Or to achieve new mirror polishing.

In contrast, higher quality hardness steels will provide excellent surface finish and good mechanical properties such as impact resistance, good abrasion resistance, high temperature resistance in the long run, In addition, in this type of steel can be impregnated Nito hard surface or chromium plating, nickel, I volume, … depending on the technical requirements of each detail. High cost and processing cost.

To make a good mold not only to calculate the texture, but also the material of each detail. They must be reasonable and suitable for each function to balance the warranty time and price, do not create unnecessary costs, maintain credibility with customers.

thép làm khuôn nhựa p20

Steel molding P20 / steel 2311

>> View: Steel to make the plastic and the which you need to know

So when should we choose materials?

Here are some common materials used in the molding industry.

Steel SKD61 – Hot making hot stamping

+ Widespread use in hot processing.

+ Pressure molds

+ Metal extrusion for light metals

+ Die forging molds

+ Plastic cylinder

+ Propeller core, oven head, hot knife

– SKD11 steel is the standard steel mark of Japan JIS standard (JIS standard). This is the line used to make dies. SKD11 steel – Steel making cold stamping

– S45C, S50C: hardness 14-18 HRC, used for molding

– 2311 steel, P20: hardness of 28 – 32 HRC, making inserts for large product molds, low output (less than 300,000 shot)

– NAK80, P21 steel: hardness 38 – 42 HRC, high molded insert mold, average output (300,000 – less than 1 million shot)

– 2083 steel, SRAVAX: pre-heat hardness of 22 HRC, after heat treatment 45-55 HRC, used for molding high gloss, anti-rust, large output (over 1 million shot)

Steel, ideal material for molding

In addition, there are special requirements for special functions such as large friction, high pressure, high temperature in the hotrunner, valva gate, anti-abrasion, anti-dirt when manufacturing products. food, high impact resistance, etc. Their materials depend on each place according to each technology and experience to give different mold quality to compete in the mold market.