Steel 30NCD16

35NCD16 - 30NiCrMo15 - 32NiCrMo12-5 - 1.6655

30NCD16 structural steel is often used in the aerospace, automotive, and civil engineering industries - any sector where components are subject to high stress. This alloy can withstand heavy loads and extreme conditions without deforming or cracking, ensuring reliability and durability of the structures and components in which it is used.

Available shapes :

Carbon 0.35%
Silicon 0.5%
Manganese 0.475%
Phosphorus 0.0175%
Sulfur 0.0175%
Chromium 1.55%
Molybdenum 0.4%
Nickel 4%

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High-Strength Steel Alloy in Aeronautics

30NCD16 (or 1.6755) is a steel alloy containing chromium, nickel, and molybdenum. It is comparable to other steels like 35NCD16, which shares a similar chemical composition and mechanical properties but is optimized for specific uses. Like 35NCD16, 30NCD16 is often used in the aerospace and automotive industries for components requiring high strength and durability under fatigue and impact, such as gears, turbine rotors, and fasteners.

This steel alloy can undergo various heat treatments to enhance its mechanical properties: annealing, quenching, and tempering. Annealing aims to reduce hardness and improve machinability, while quenching and tempering increase hardness and mechanical strength.

Chemical composition of 30NCD16

The variations in its chemical composition for aerospace.

% C
Min. 0.25 0.10 0.20 >0 >0 1.10 0.20 3.70
Max. 0.45 0.90 0.75 0.035 0.035 2.00 0.60 4.30
Tensile Strength

Tensile Strength

<1750 N/mm²

Yield Strength

Yield Strength

<1250 N/mm²

Impact Toughness

Impact Toughness

<140 J/cm²

How 30NCD16 is used in aerospace

The practical applications of this steel in aircraft construction.


Turbine rotors

Turbine rotors are present in Auxiliary Power Units and provide the necessary energy for the aircraft when it is on the ground. The wear resistance provided by 30NCD16 is suitable for rotors that spin very rapidly.


Gears enable the movement of flaps and landing gear. Subjected to constant friction, they must be wear-resistant: this is where the use of 30NCD16 comes in.


Fasteners (bolts, screws, etc.) maintain the structural integrity of aircraft, subjected to various load and stress conditions. 30NCD16 is particularly suitable here, making them resistant to impacts and vibrations.

Optimizing the use of 30NCD16 : treatments, regulations, and options.

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The information in this technical data sheet is indicative and may be changed without notice. The values given are typical and not guaranteed. Paris-St-Denis-Aero disclaims any responsibility for product choices or the consequences of those choices.
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Applications of
30NCD16 steel

How it is used in various industries.

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