Aciers résistants à la corrosion - Aciers martensitiques durcissables (PH )

BÖHLER N700 is a high-quality corrosion-resistant steel in aerospace quality, in the form of bars, wire and forgings with a diameter/thickness of up to 203 mm in the solution-annealed condition, as well as starting material of any size for forging purposes. It is a martensitic, precipitation-hardenable chromium-nickel-copper steel with high strength and toughness. Further increases in strength can be achieved by cold forming and subsequent precipitation hardening. These products are typically used for parts requiring corrosion resistance and high strength up to 316°C. However, their use is not limited to such applications. However, use is not limited to such applications. Certain processing methods and operating conditions can cause these products to become susceptible to stress corrosion cracking. For applications such as bolting where stress corrosion cracking is possible, the product should be aged for a minimum of 4 hours at the highest temperature compatible with the strength requirements, but in no case lower than 552°C.

Pièces dans l’industrie aéronautique, pour pompes et vannes dans les systèmes à haute pression, pour les entraînements hydrauliques qui sont fortement sollicités en matière de corrosion, de solidité et de ténacité.

BÖHLER N709 is a premium aircraft-quality corrosion-resistant steel in the form of bars, wire, forgings up to 12.0 inches (305 mm) in diameter or least distance between parallel sides in the solution heat treated condition as well as stock of any size for forging. It is a martensitic precipitation hardenable chromium-nickel-molydenum-aluminium steel possessing high strength and toughness. These products have been used typically for parts requiring corrosion resistance, stress-corrosion resistance and high strength up to 600 °F (316 °C) with good ductility and strength in the transverse direction in large section sizes but,but usage is not limited to such applications. Certain processing procedures and service conditions may cause these products to become subject to stress-corrosion cracking.

BÖHLER N713 is an ESR-remelted corrosion-resistant steel available in bar, wire, and forgings. It is a martensitic, precipitation-hardenable (PH-type) chromium-nickel-copper-titanium-niobium steel with high strength and toughness. The steel can be precipitation-hardened in a single-stage aging treatment to a minimum tensile strength of 225 KSI (1551 MPa) with good ductility and toughness. These products are typically used for parts requiring corrosion resistance, stress corrosion resistance, and high strength up to 427 °C (800 °F) with good transverse ductility and transverse strength at large cross-sectional dimensions. The steel is typically used for medical instruments and engineering components, but is not limited to these applications. Certain processing methods and operating conditions can cause stress corrosion cracking to occur in these products.

BÖHLER N765 (UNS S46500) is a double vacuum-melted, stainless, maraging steel (PH-Grade) with a unique combination of high strength, toughness and corrosion resistance. The products are typically used for heat-treated parts where resistance to stress corrosion cracking, high strength and toughness up to 427 °C (800 °F) with good ductility and transverse strength are required. BÖHLER N765 material achieves a tensile strength of over 250 ksi (1722 MPa) when aged at 950 °F (H950 condition) and offers a superior combination of strength, toughness and stress corrosion cracking resistance compared to other high strength PH-steels such as 15-5PH or PH 13-8Mo. Hardening temperatures from 950°F to 1050°F can be selected to achieve the desired combination of strength, toughness and stress corrosion cracking resistance. The alloy not only meets the special and demanding requirements of the aerospace industry, but is also used in marine equipment, firearms, hand tools, oil and gas drilling and the medical industry, among others.