X3NiCoMoTi18-9-5 / 1.2709 Tool Steel

Steel Circle Delivery Forms1.2709 / X3NiCoMoTi18-9-5

Steel Round 1.2709 / X3NiCoMoTi18-9-5

General Overview

Steel round 1.2709 (X3NiCoMoTi18-9-5) is a high-strength martensitic steel with increased hardness and excellent mechanical properties. It belongs to the group of nickel-based tool steels used under high loads and extreme temperatures. Due to its unique properties, 1.2709 is an excellent choice for manufacturing components subjected to intensive wear and mechanical stress.

Steel Properties

• High strength and hardness – reaches a hardness of 52-57 HRC after aging;
• Excellent impact toughness – resistant to dynamic loads;
• Superb machinability – can be mechanically and thermally processed;
• Low residual stress – ensures dimensional stability after heat treatment;
• High corrosion resistance – resistant to oxidation and corrosion in industrial conditions.

Chemical Composition

• Nickel (Ni): 17.0-19.0%
• Cobalt (Co): 8.5-10.0%
• Molybdenum (Mo): 4.5-5.2%
• Titanium (Ti): 0.8-1.2%
• Carbon (C): ≤ 0.03%
• Silicon (Si): ≤ 0.10%
• Manganese (Mn): ≤ 0.10%
• Phosphorus (P): ≤ 0.01%
• Sulfur (S): ≤ 0.01%

Applications

Thanks to its high strength and excellent machinability, steel 1.2709 is widely used in the following industries:

• Aerospace Industry – aircraft components, high-strength engine parts;
• Mechanical Engineering – dies, molds, and hot forging tools;
• Automotive Industry – suspension parts, high-load mechanism housings;
• Metallurgy – metal processing components, matrices, and punches;
• 3D Metal Printing – powder materials for additive manufacturing.

Mechanical Characteristics

• Tensile strength – 2000-2100 MPa;
• Hardness after aging – 52-57 HRC;
• Impact toughness – high;
• Good hardenability – uniform hardness throughout the cross-section of the product.

Advantages of Steel 1.2709

✅ High strength and durability – ideal for extreme loads. ✅ Deformation resistance – ensures stability during operation. ✅ Excellent machinability – easily subjected to mechanical processing, grinding, and polishing. ✅ Corrosion resistance – less prone to oxidation and wear compared to other martensitic steels.