SKD11 Tool Steel Bar - High-Carbon Cold Work Die Steel Round Bar

SKD11 tool steel bar represents a premium-grade high-carbon, high-chromium cold work die steel widely employed in precision tooling and industrial manufacturing applications. Engineered with exceptional wear resistance and dimensional stability, this alloy finds extensive application in stamping dies, cutting tools, and precision molds where superior hardness retention is critical. Designed for tool and die makers, precision manufacturers, and industrial fabricators, SKD11 delivers outstanding performance in demanding cold work environments requiring extended service life and minimal deformation.

What is SKD11 Tool Steel Bar?

SKD11 tool steel bar is a high-carbon, high-chromium cold work die steel conforming to JIS G4404 standards, equivalent to AISI D2 and DIN 1.2379. This air-hardening steel contains approximately 1.40-1.60% carbon and 11.00-13.00% chromium, providing exceptional wear resistance and dimensional stability during heat treatment. The material exhibits superior compressive strength and maintains hardness levels of 58-62 HRC after proper hardening, making it the preferred choice for precision tooling applications requiring minimal distortion and long operational life.

SKD11 Tool Steel Bar Technical Specifications

The chemical composition of SKD11 tool steel bar per JIS G4404 includes carbon content of 1.40-1.60%, chromium 11.00-13.00%, molybdenum 0.80-1.20%, vanadium 0.10-0.50%, and silicon 0.40% maximum. Typical mechanical properties include tensile strength of 750-850 MPa in annealed condition, hardness of 255 HB maximum when annealed, and achievable working hardness of 58-62 HRC after oil quenching from 1000-1020°C. The material demonstrates density of 7.70 g/cm³ at 20°C and thermal conductivity of 20 W/m·K, ensuring predictable performance in precision manufacturing operations.

Key Advantages of SKD11 Cold Work Die Steel

SKD11 tool steel bar offers superior wear resistance due to its high chromium carbide content, delivering extended tool life in abrasive stamping and blanking operations. The alloy exhibits minimal dimensional change during heat treatment, typically less than 0.15% linear variation, ensuring precision tolerances in finished tooling. Air-hardening characteristics eliminate quench cracking risks associated with oil or water quenching, while excellent machinability in annealed condition facilitates cost-effective tool fabrication. The material maintains structural integrity at elevated temperatures up to 200°C, providing reliable performance in continuous production environments.

Common Applications and Industry Uses

SKD11 tool steel bar serves critical roles in manufacturing precision stamping dies, blanking punches, and thread rolling dies for automotive and electronics industries. The material is commonly employed for cold heading tools, shear blades, and precision cutting knives requiring sustained edge retention. Industrial applications include plastic injection mold components, powder compaction tooling, and wear-resistant machine parts operating in abrasive conditions. The aerospace sector utilizes SKD11 for precision forming dies and trim tools, while the medical device industry specifies this grade for surgical instrument manufacturing dies.

Heat Treatment and Hardening Guidelines

Proper heat treatment of SKD11 tool steel bar involves stress relieving at 600-650°C for complex geometries, followed by preheating to 600-850°C in two stages to minimize thermal shock. Austenitizing occurs at 1000-1020°C with holding time of 15-30 minutes depending on section thickness, followed by air cooling or oil quenching for enhanced toughness. Tempering should be performed immediately after cooling to room temperature, with double tempering at 180-520°C for 2 hours each cycle recommended to achieve target hardness and dimensional stability. Sub-zero treatment at -70°C may be employed to transform retained austenite and maximize wear resistance in critical applications.

Frequently Asked Questions

What is the minimum order quantity for SKD11 tool steel bar?

Our mill-direct pricing structure accommodates orders from 500 kg minimum quantity, with volume discounts available for quantities exceeding 2000 kg. Custom cutting and precision grinding services require 200 kg minimum per specification to ensure cost-effective processing and delivery scheduling.

Do you provide material test certificates for SKD11 steel?

Yes, we supply comprehensive mill test certificates (MTC) per EN 10204 3.1 documentation, including complete chemical composition analysis, mechanical property verification, and heat number traceability. Third-party inspection reports from SGS or TÜV are available upon request for critical aerospace and medical applications requiring additional certification.

What is the typical delivery time for SKD11 tool steel bars?

Standard diameter rounds from 10-300 mm in annealed condition ship within 15-20 business days from our Asian manufacturing facilities. Custom sizes requiring precision grinding or specific length cutting typically require 25-30 days lead time, while special chemical compositions or additional testing may extend delivery to 35-40 days depending on mill production schedules.

Can you cut SKD11 bars to custom sizes and provide machining?

Our precision cutting services accommodate length tolerances of ±0.5 mm for bars up to 3000 mm, with CNC sawing and surface grinding available to achieve Ra 1.6 μm finish. We provide rough machining, milling of keyways, and drilling services in annealed condition to reduce your production costs, with all custom processing performed according to your technical drawings and dimensional specifications.

Get a Competitive Quote for SKD11 Tool Steel Bar

Contact our technical sales team today for factory-competitive pricing on SKD11 tool steel bar tailored to your specific application requirements. Our metallurgical experts provide complimentary material selection consultation, heat treatment recommendations, and supply chain solutions to optimize your tooling performance and production efficiency. Request your detailed quotation with chemical composition certification and delivery scheduling by reaching out through our online inquiry form or speaking directly with our cold work steel specialists.