FT64H Plastic Mold Steel

One. Product Description

FT64H is martensitic stainless steel with good machinability. After quenching and tempering treatment, it has excellent corrosion resistance, polishing, high strength and wear resistance. Plastic molds, transparent plastic molds, etc. under the action of corrosive media.

Two. Quality Standard

ASTM A176 1999 Standard Specification

Three. Product Specifications

Four. Equivalent Grade of FT64H Mold Steel - For Reference Only

Five. Product Features and Uses

Features:

1. Superior polishing performance.

2. Good corrosion resistance.

3. Excellent wear resistance.

4. Good machinability.

Use:

1. Corrosion resistance and rust resistance (suitable for the use of corrosive PVC, acetate fiber and other injection molding materials or molds, must work and be stored in a humid environment).

2. High-quality surfaces (production of optical products, such as: cameras, sunglasses lenses, syringes, analytical bottles, food industry machinery parts).

3. Suitable for large-size, high-precision mirror-polished plastic molding molds, etc.

Six. Product Detailed Information

FT64H steel has excellent mold properties such as high toughness, corrosion resistance, excellent polishability and pure and fine steel structure, and is recommended for all molds.

FT64H corrosion resistant mold steel is Cr13 type high alloy martensitic steel. The steel has good machinability, and after quenching and tempering heat treatment (quenching and tempering), the pre-hardening hardness reaches 35HRC. The steel has good corrosion resistance, mirror polishing performance, high strength and wear resistance, and is suitable for manufacturing plastic molds, transparent plastic molds, etc. that are subjected to high load, high wear resistance and corrosive media. However, due to the high content of FT64H alloy elements, the control of the cooling process during quenching is very critical, and edge cracks will appear when the cooling strength is slightly larger. To this end, through the experiments of different cooling processes, a reasonable cooling process is formulated.

The pre-quenching heat treatment is carried out on the continuous quenching and tempering line of the finishing mill of this special steel company. The flat steel is heated and kept warm in the continuous heating furnace, and is transported to the "water-air alternately speed-regulated quenching water tank" through the roller table. The quenching and tempering cooling adopts the combined cooling method of air cooling and water immersion. The quenched billets are directly transported to the continuous annealing furnace through the roller table for tempering heat treatment.

For the quenching and cooling test, the pre-hardening heat treatment process of FT64H corrosion-resistant mold steel was studied, and two cooling processes were proposed. The quenching cooling process is analyzed in detail, and the results show that:

1. Changes in the cooling process that do not affect the performance results of the steel may cause longitudinal cracks on the surface of the steel.

2. Adding agitation in the vapor film cooling stage helps to destroy the vapor film early and enter the boiling cooling stage in advance.

3. The air cooling process is added between the two water cooling, so that the heat of the steel core is gradually released, which can effectively reduce the stress caused by the temperature gradient.

4. After the second soaking, the reflow temperature should be higher than the Ms point, and the soaking time should not be too long to avoid the surface temperature being too low.