Cr12 Cold Work Mold Steel

One. Product Description

Cr12 Mold Steel is a typical alloy tool steel. It is a widely used cold work mold steel with high strength, good hardenability and wear resistance, but poor impact attenuation. Cold molds and punches, cold shears, drill sleeves, gauges, wire drawing molds, punching molds, thread rolling molds, wire drawing molds and thread rolling molds with high wear resistance requirements.

Two. Quality Standard

GB/T 1299-1985 Standard Specification for Tool Steel Alloys

Three. Product Specifications

Four. Equivalent Grade of Cr12 Mold Steel - For Reference Only

Five. Product Features and Uses

Features:

1. The purity of the steel treated by vacuum degassing refining.

2. Spheroidizing annealing softening treatment, good cutting performance.

3. The strengthening elements vanadium and molybdenum are specially added, and the wear resistance is excellent.

Use:

1. Thin plates with a thickness not exceeding 2MM, efficient blanking mold, punching mold, stamping mold.

2. All kinds of scissors, inlaid blades, woodworking blades.

3. Thread rolling mold and wear-resistant slider.

4. Cold heading mold, thermosetting resin molding mold.

5. Stretch forming mold, cold extrusion mold.

Six. Product Detailed Information

Cr12 mold steel is a high-carbon high-chromium ledeburite steel. The steel has good hardenability, wear resistance and hot workability. Carbides are well distributed in the steel. Can be used for complex shapes and heavy working conditions. Various cold work molds, such as cold stamping molds, thread rolling molds, wire drawing molds, material molds, metallurgical powder molds, woodworking knives, cold cutting scissors drill sleeves and gauge punches. According to market demand, the company has repeatedly explored and tested in research and development, and has formulated a reasonable smelting process and special ingot mold and forging process to make the material structure uniform. In addition, the standard material processing has also made bold innovations. The vacuum degassing refining treatment makes the Cr12 mold steel more pure, the spheroidizing annealing softening treatment effectively improves the cutting performance, and the reasonable addition of the metal elements vanadium and molybdenum makes it more wear-resistant.

Processing:

1. Delivery status: The steel is delivered in an annealed state, with a hardness of 269~271 HBW.

2. Hardness: annealing 269~271HB, indentation diameter 3.7~4.1mm, quenching>58HRC.

3. Metallographic structure: tempered martensite + undissolved carbide + retained austenite.

4. Quenching temperature: Cr12 quenching 950~1000℃ oil quenching, secondary tempering 550℃.

High temperature quenching at 1100~1150℃, low temperature quenching at 960~1050℃, and tempering at 550~650℃. It is best to preheat twice before high temperature quenching. When heating at high temperature, protective measures should be taken to prevent oxidation.

The surface embrittlement susceptibility of Cr12 mold steel is closely related to its heat treatment process, which mainly depends on its own hardness, retained austenite, mechanical properties, etc. Since the heat treatment process affects these factors, the cracking sensitivity of Cr12 mold steel can be controlled by adjusting heat treatment process.

Cr12 mold steel is quenched at 1000°C and 1030°C, then cold treated and tempered at 200°C. Its surface brittle crack resistance is not as good as 960 ℃, 1060 ℃ and 1100 ℃ quenching and then 200 ℃ cold treatment and tempering treatment, transgranular cracks appear on the surface. Or along the crystal cracks.