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2. Shaft (mechanical engineering) - Wikipedia

   en.wikipedia.org/wiki/Shaft_(mechanical_engineering)

   The material used for ordinary shafts is mild steel. When high strength is required, an alloy steel such as nickel, nickel-chromium or chromium-vanadium steel is used. Shafts are generally formed by hot rolling and finished to size by cold drawing or turning and grinding. [citation needed]

3. Aermet - Wikipedia

   en.wikipedia.org/wiki/Aermet

   AerMet alloy is an ultra-high strength type of martensitic [1] alloy steel. The main alloying elements are cobalt and nickel, but chromium, molybdenum and carbon are also added. Its exceptional properties are hardness, tensile strength, fracture toughness and ductility. [2] Aermet is weldable with no preheating needed. [3]

4. 17-4 stainless steel - Wikipedia

   en.wikipedia.org/wiki/17-4_stainless_steel

   17-4PH is used in applications requiring high strength, hardness, and corrosion resistance up to 300 °C (600 °F). [4]It is commonly used in the aerospace industry for its high strength, and in marine applications for its corrosion resistance, although it can be susceptible to crevice corrosion in stagnant salt water.

5. Maraging steel - Wikipedia

   en.wikipedia.org/wiki/Maraging_steel

   Maraging steel is used in oil and gas sector as downhole tools and components due to its high mechanical strength. [21] The steel's resistance to hydrogen embrittlement is critical in downhole environments where exposure to hydrogen sulfide (H₂S) can lead to material degradation and failure.

6. High-strength low-alloy steel - Wikipedia

   en.wikipedia.org/wiki/High-strength_low-alloy_steel

   High-strength low-alloy steel (HSLA) is a type of alloy steel that provides better mechanical properties or greater resistance to corrosion than carbon steel. HSLA steels vary from other steels in that they are not made to meet a specific chemical composition but rather specific mechanical properties.

7. Martensitic stainless steel - Wikipedia

   en.wikipedia.org/wiki/Martensitic_stainless_steel

   Martensitic stainless steels can be high- or low-carbon steels built around the composition of iron, 12% up to 17% chromium, carbon from 0.10% (Type 410) up to 1.2% (Type 440C): [9] Up to about 0.4%C they are used mostly for their mechanical properties in applications such as pumps, valves, and shafts.