[Cold Work Tool Steel YSTG11] JIS-Certified SKD11 Equivalent Material | Combining Quality Equivalent to Japanese Steel with Cost Reduction

YAMAICHI SPECIAL STEEL (THAILAND) CO., LTD. supplies "YSTG11" cold work tool steel in Thailand.

YSTG11 is a cold work die steel equivalent to SKD11, manufactured by Tiangong, one of the world's leading tool steel producers. This product obtained JIS (Japanese Industrial Standards) certification in November 2025 and is widely adopted in various cold work molds, including by Japanese automotive parts manufacturers.

Table of Contents

• Quality Equivalent to Japanese Steel
• Track Record in Automotive Mold Applications
• Reducing Mold Production Costs
• Standard Heat Treatment Conditions
• Supply Structure in Thailand

■ Quality Equivalent to Japanese Steel

Below are the results of a comparison test with Company A's SKD11, conducted by YAMAICHI SPECIAL STEEL (THAILAND) CO., LTD.

As a result of the verification, YSTG11 demonstrated performance equivalent to conventional SKD11 from Company A in terms of hardness and dimensional stability after heat treatment.

In addition, no issues were observed regarding machinability, post-processing appearance, or tool wear. In tests following PVD coating, no film peeling was observed, confirming coating adhesion equivalent to conventional materials.

※ The above results are based on internal test data. Actual performance may vary depending on product geometry, processing conditions, heat treatment conditions, and operating environments.

■ Track Record in Automotive Mold Applications

YSTG11 is adopted in 3,000-ton transfer molds used for producing automotive body parts.

In addition, it is widely utilized in automatic progressive molds for automotive seat parts, molds for precision parts, and tandem molds related to the ceramics industry.

■ Reducing Mold Production Costs While Maintaining Quality

YSTG11 is a cold work tool steel that enables cost reduction in raw materials and mold manufacturing while maintaining quality and processability equivalent to conventional SKD11.

For customers concerned about quality or dimensional changes after heat treatment when switching from Japanese steel, we provide material selection support based on the intended application and mold conditions.

■ Standard Heat Treatment Conditions

※ Actual heat treatment conditions must be adjusted according to mold shape, dimensions, application, and required hardness.

■ Supply Structure in Thailand

YAMAICHI SPECIAL STEEL (THAILAND) CO., LTD. is the exclusive distributor of YSTG11 in Thailand. We maintain approximately 2,500 tons of tool steel stock in Thailand and provide one-stop services from material supply to vacuum heat treatment, precision machining, and surface treatment.

※ For inquiries regarding stock sizes, pricing, delivery schedules, heat treatment, or machining, please contact us using the inquiry form at the bottom of the page.