17CrNi6-6, 1.5918, 18NiCr5-4, 1.5810, 15CrNi6, 1.5919 – Case-hardening steel

Grade 17CrNi6-6, 1.5918 steel – medium-alloy case-hardening steel characterized by high wear resistance, outstanding core hardness, and excellent toughness.

Material formerly also known under the designation 15CrNi6, 1.5919, equivalent to 18NiCr5-4, 1.5810.

Grade 17CrNi6-6 (1.5918), 18NiCr5-4 (1.5810), and 15CrNi6 (1.5919) materials are suitable for case hardening and through-hardening up to a depth of 50 mm. This material exhibits higher core strength and toughness compared to standard case-hardening steels. The tensile strength of this steel ranges from 900 to 1200 N/mm². The material is used for the production of highly stressed machine components such as gears, shafts, crankshafts, connecting rods, camshafts, etc. This steel is also used for manufacturing cutting tools, pressing tools, woodworking tools, drawing and deep-drawing tools. Also for cold-forming rollers and measuring instruments. The heat treatment of this steel includes forging at a temperature of 1100–800 °C. Normalizing temperature is at 880–900 °C, soft annealing at 680–720 °C, and intermediate annealing at 620–640 °C. Hardening is carried out in oil at 830–860 °C, tempering at 150–200 °C, and case hardening at 860–880 °C.

Round drawn bars with a diameter of 13 mm in stock. Bars rolled to a diameter of 200 mm. Other dimensions available upon request.

Properties of grade 17CrNi6-6, 1.5918 steel

17CrNi6-6 steel is a case-hardening alloy steel with high wear resistance, excellent hardness, and toughness. Its mechanical properties are optimized for applications requiring high strength and impact resistance. 1.5918 steel is known for its good hardenability and also high resistance to fatigue loads.

The chemical composition of grade 17CrNi6-6, 1.5918 steel

The chemical composition of grade 17CrNi6-6, 1.5918 steel, is carefully balanced to achieve its exceptional properties. The typical composition is as follows:

• Carbon (C): 0.17%
• Silicon (Si): 0.40%
• Phosphorus (P): max. 0.025%
• Sulphur (S): max. 0.035%
• Chromium (Cr): 1.50–1.80%
• Nickel (Ni): 1.40–1.70%
• Manganese (Mn): 0.50–0.80%
• Molybdenum (Mo): max. 0.10%

This combination of elements ensures high strength and wear resistance.

Most common applications of 17CrNi6-6, 1.5918 steel

Grade 17CrNi6-6, 1.5918 steel is widely used in various industrial sectors.

Automotive industry

It is used for the production of gear sets, shafts, and other components subjected to high wear.

Mechanical engineering

Ideal for the production of machine parts that require high strength and impact resistance, such as gears, cams, and pins.

Aerospace industry

Applications in critical aircraft components, where high reliability and safety are emphasized.

Power industry

Suitable for the production of power plant components where long service life and high resistance to fatigue loads are required.