Special Steels

17-4PH o X5CrNiCuNb 16-4

Cr Ni Cu precipitation hardening stainless steel, good resistance to corrosion even in marine or sulphuric environments; maximum employment temperature: 540 °C.
Suitable for high strained components operating in corrosive environments, both in chemicals and motor industries.
Specific Correspondence:
EN10088-3 X5CrNiCuNb 16-4; W. n.1.4542; AISI 630; ASTM 17-4PH.
Main applications:
Valves for oil industry, turbine, tie bars, propeller axles, propeller palettes, gearwheels, nuts and bolts, springs, supporting cables in seawater.

17-7PH o X7CrNiAl

The presence of aluminum gathers high ductility and elevated mechanical properties in the springs. Even with lesser mechanical properties than AISI 302, it allows the production of springs of complex shapes. After the precipitation hardening, springs offer superior mechanical features than AISI 302; maximum employment temperature: 300°C.
Specific corrispondence:
W. n. 1.4568; EN 10270-3 X7CrNiAl; ASTM 17-7 PH; AISI 631.
Main applications:
Often used for complex components, due to its lower distortion during the heat treatment. Very stable. Used in a wide range of springs, washers, and elastic components.


This CoNiCrMo alloy provides excellent elastic properties, resistance to corrosion, heat stability, and resistance to temperature up to 600°C. This material is totally resistant to rust, fresh and sea water, and a wide range of corrosive chemicals. Not magnetic.
Specific correspondence:
W. n. 2.4781.
Main applications:
Springs and operative elements for high heated loads. Membranes enduring corrosion, for example in pressure gauges. Elastic components exposed to extreme processing cycles, like in valves, turbines or engines. Springs for chemical industry.


This alloy of cobalt – chrome – nichel provides a combination of high resistance, ductility, and excellent mechanical properties; it has indeed an excellent resistance to stress and corrosion in different environments, and has not magnetic properties
Specific correspondence:
W. n. 2.4711; ASTM F1058; ISO 5832-7.
Main applications:
Medical devices, dental products, orthopedic and surgical prosthesis, clock parts, aerospace and petrochemical applications.


This nickel-molybdenum-chrome alloy, charged with tungsten, has an excellent resistance to corrosion by a wide range of corrosive agents and it is particularly resistant to corrosion caused by toothing and cracking.
Main applications:
Pollution control, chemical processing, waste treatment, naval engineering, paper industry.


Good mechanical characteristics at high temperatures – Excellent resistance to corrosion by various kinds of corrosive fluids and highly resistant to oxidation.
Main applications:
Chemical and petrochemical industry, for heaters, alembics, condensers, etc.; aeronautics, for turbine packing, aircraft and engine structure, etc.


Good mechanical characteristics at high temperatures up to 700°C (1290°F); resistant to corrosion and oxidation and good weldability.
Main applications:
Cryogenic engineering, nuclear engineering, gas turbines, rocket engines, space planes, nuclear reactors, pumps.


Good elastic properties at high temperatures, up to 700°C (1290°F); good resistance to chemical corrosion and oxidation and very high stress resistance.
Main applications:
Aerospace industries, thermal processing.


Good mechanical characteristics at high temperatures up to 950°C (1740°F) – resistant to oxidation, hardenable through precipitation.
Main applications:
Aerospace industries, thermal processing.


Springflex has been designed to provide a better alternative to traditional stainless steels, such as AISI 302, 304 and 316 for the manufacturing of compression springs, extension springs, torsion springs and shaped springs. Springflex has been conceived to use springs in complex projects, in applications with high mechanical stresses, difficult or aggressive environment. Service temperature from -100 to 300°C (-150 to 570°F).
Main applications:
Brush starter, inhaler pumps and valves, airplane seatbelt buckles, valves for oil pumps.

Titanium Grade 5

Titanium Grade 5 has excellent resistance properties to tensile stress at room temperature, excellent resistance/weight ratio and a useful resistance to sliding up to 300°C (570°F). Resistance to breaking and crack propagation is excellent too. As for most titanium alloys, Grade 5 has a very good resistance to corrosion in most natural environments and industrial processing environments.
Main applications:
Aerospace industries, prosthesis, jewels, chemical industry.


Age hardening, excellent resistance to high temperatures up to 980°C (1800°F). Its resistance is generally comparable with that of “Rene 41”.
Main applications:
turbocharged engine parts, aerospace components.

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