The global tire mold steel sipe market is valued at approximately RMB 21 billion (USD 2.9 billion), with additive manufacturing penetration reaching 20-30% and growing rapidly. What's driving this shift, and why are major tire manufacturers like Hankook betting on AM?
The Limitations of Traditional Sipe Manufacturing
Conventional tire sipe production relies on stamping, wire-cutting, or CNC machining. While these methods are mature, they face inherent constraints:
- Geometry restrictions — Complex internal channels, conformal cooling, and optimized flow paths are either impossible or prohibitively expensive to machine.
- Material waste — Subtractive processes can waste up to 70-80% of the raw material, driving up costs for high-grade tool steels.
- Design iteration delays — Each design change requires new tooling or programming, stretching lead times from weeks to months.
- Performance ceilings — Spring-form and 3D spring sipe designs that improve tire performance are extremely difficult to produce conventionally.
What LPBF Brings to the Table
Laser Powder Bed Fusion (LPBF) eliminates these constraints. At Shinengine, we produce tire sipes with geometries that traditional subtractive manufacturing simply cannot match:
- Multi-axis internal spring structures built in a single print — no assembly required
- Variable wall thicknesses optimized for stress distribution and weight reduction
- Surface textures integrated directly into the build for improved demolding performance
- Batch consistency across thousands of parts, thanks to standardized process parameters
Real-World Results: 10 Million Parts and Counting
Shinengine has delivered over 10 million additively manufactured steel sipes to tire mold manufacturers worldwide, with exports to Japan, South Korea, India, Turkey, Malaysia, and Thailand. Our Hankook Tire certification — achieved in 2023 — validates that AM-produced sipes meet the most demanding OEM quality standards.
Key performance advantages our customers report:
- 50-70% reduction in lead time compared to traditional tooling-based methods
- Material utilization above 95%, dramatically reducing per-part cost for high-grade steels
- Design freedom enabling next-generation sipe geometries that improve tire performance
- Scalable production — from prototype runs of 100 to mass production of 500,000+ parts
The Materials Advantage
Our sipes leverage Shinengine's in-house powder production capabilities. We offer a full range of tool steel and stainless steel grades optimized for tire mold applications:
- 18Ni300 (Maraging Steel) — Exceptional strength and toughness for high-wear applications
- 1.2709 — Industry-standard tool steel with excellent polishability
- CX (YP Series) — Corrosion-resistant tool steel for demanding environments
- 17-4PH, 316L, 15-5PH — Stainless steel options for corrosion-critical applications
With in-house powder production and self-developed atomization technology, we control quality from raw material to finished part — eliminating the supply chain fragmentation that plagues traditional manufacturing.
Looking Ahead: The 30% Horizon
As AM penetration in the tire mold segment climbs toward 30%, early adopters are already securing competitive advantages. The question for tire mold manufacturers is no longer whether to adopt additive manufacturing, but how quickly they can integrate it into their production workflows.
At Shinengine, we're ready to help — with proven capacity, certified quality, and over 10 million parts of experience.
Interested in learning more? Contact our team to discuss your tire mold sipe requirements, or explore our full range of metal AM services.