Cold-work mold steel serves as the core material for metal forming at room temperature. Many misunderstand the term “cold-work” as working under low temperature. In fact, it means the mold performs stamping, cold extrusion, cold rolling and blanking at ambient temperature. During operation, the mold bears heavy compressive force, friction and cyclic impact loads. Foshan Jinjun Metal (Taiyuan Mold Steel) shares professional knowledge of cold-work mold steel, assisting manufacturing engineers to select proper materials and prevent premature mold failure.

Core Performance Requirements of Cold-work Mold Steel

1. High wear resistance: Resist continuous metal friction to keep stable workpiece dimension and prevent rapid cavity or cutting-edge wear.

2. Good toughness: Absorb impact force to avoid chipping, edge breaking and cracking.

3. Excellent hardenability: Ensure uniform hardness throughout thick molds after heat treatment and minimize deformation.

4. High compressive strength: Resist heavy extrusion load and prevent cavity collapse and plastic deformation.

Main Grades & Typical Applications

Cr12MoV / SKD11 (D2): Classic high-carbon high-chromium cold-work steel with great wear resistance and dimensional stability. Suitable for sheet stamping, cold forming rolls, forming rollers for keel & rack machines, and heavy-gauge blanking dies.

DC53: Improved grade based on SKD11 with better toughness and lower cracking risk after heat treatment. Widely used in precision blanking, stainless steel stamping and cold extrusion dies.

LD, 6W6: High-toughness cold-work steel with outstanding impact resistance, ideal for heavy-load cold extrusion punches and thick-plate cutting dies prone to chipping.

Powder metallurgy high-speed steel: Ultra-high wear resistance paired with good toughness. For mass continuous production and forming of high-strength stainless steel & hard alloys.

Three Major Failure Modes of Cold-work Dies

1. Wear failure: The most frequent issue. Gradual edge wear causes excessive burrs and out-of-tolerance workpiece dimensions.

2. Chipping: Insufficient toughness or excessively high hardness leads to edge fracture under impact.

3. Cracking & deformation: Caused by low steel purity or improper heat treatment, resulting in cracks and shape distortion.

Reminder: Material selection for cold-work dies should not simply pursue maximum hardness. For mass production and heavy impact conditions, it is critical to balance **wear resistance and toughness**. Even for the same steel grade, heat treatment largely determines actual die service life.

Jinjun Metal supplies a full range of cold-work mold steel with sawing, precision grinding and heat-treatment technical support. We also provide cold roll-forming equipment including keel machines and guide rail machines. Customized material solutions are available for cold extrusion, stamping and forming roll applications to reduce mold consumption and improve overall production efficiency. New and existing customers are welcome for inquiries and sample testing.