Ni-Base Alloys

BÖHLER L004 belongs to the group of highly corrosion-resistant nickel-chromium-molybdenum alloys with very low carbon, iron and silicon content and has good corrosion resistance, even at elevated temperatures. The combination of chromium with a high molybdenum content gives BÖHLER L004 exceptional resistance to a wide range of chemical media: e.g. contaminated, reducing mineral acids and good resistance under reducing and oxidizing conditions, e.g. hot, contaminated media such as sulphuric acid, nitric acid, dry chlorine, formic acid, acetic acid, solvents, chlorine and chloride-containing media. BÖHLER L004 exhibits a significantly reduced tendency to form precipitates in the temperature range between 650 and 1,040 °C due to the alloy composition. This improves resistance to intergranular corrosion. Due to the high nickel content, the material is practically insensitive to chloride-induced stress corrosion cracking even in hot chloride solutions. Due to its excellent thermal stability, the alloy can be welded without any problems and is generally used in the welded condition. Suitable for pressure vessels with wall temperatures from-196°C to 400°C.

BÖHLER L022 belongs to the group of highly corrosion-resistant nickel-chromium-molybdenum-tungsten alloys with extremely low carbon and silicon contents. Good resistance to wet media, e.g. sulphuric acid, nitric acid, acid mixtures of sulphuric acid and oxidising acids with chloride ions. Recommended for use in the presence of strong oxidising agents such as iron(III) and copper(II) chlorides, chlorine gas, formic acid, acetic acid, seawater and other salt solutions. High resistance to crevice, pitting and stress corrosion cracking at elevated temperatures under oxidising and reducing conditions. Used in environmental engineering, e.g. in agitators, heat exchangers and spray systems in flue gas cleaning plants and in waste water treatment plants, evaporation plants in chemical process engineering, in chlorine bleaching plants and plants for the production of chlorine gas and hydrogen chloride, e.g. butterfly valves, gate valves, pipelines and centrifuges. Suitable for pressurised containers with wall temperatures from-196°C to 400°C. Due to its good thermal stability, BÖHLER L022 can generally be used in the welded condition without subsequent heat treatment.

BÖHLER L059 (2.4605/N06059) is a nickel-chromium-molybdenum material with high mechanical strength and excellent corrosion resistance. Due to its particularly low carbon and silicon content, the material does not tend to form precipitates at grain boundaries during welding or hot forming. BÖHLER L059 offers excellent corrosion resistance, both under oxidizing and reducing conditions, high resistance to chloride-induced pitting and crevice corrosion as well as insensitivity to stress corrosion cracking and resistance to mineral acids, especially sulphuric/hydrochloric acid mixtures. The alloy is therefore suitable for a wide range of applications in the chemical, petrochemical, energy and environmental technology sectors in chloride-containing media, in particular plant components in the pharmaceutical industry and also agitators for flue gas desulphurization plants (FGD) in fossil-fired power plants and waste incineration plants, components for seawater and concentrated brines, equipment and components for geothermal and sour gas applications, reactors for acetic acid and acetic anhydride as well as hydrofluoric acid and sulphuric acid coolers.

Nickle-Chromium-Iron alloy with added Titanium, used for components in steam and gas turbines.

BÖHLER L200 is a technically pure nickel alloy with at least 99% nickel and a low carbon content. This alloy combination suppresses harmful precipitation, e.g. of graphite, and enables application temperatures of over 300°C to around 450°C. The material offers excellent ductility and corrosion resistance, in particular resistance in many alkaline and acidic solutions, e.g. cooling brines, soaps, fatty acids, fruit acids, phenol, caustic soda and neutral salt solutions, dry chlorine gas and hydrogen chloride, bromine and fluorine (CFC production) and other reducing and oxidising media. The main areas of application for the BÖHLER L200 alloy are plant and tank construction in the food, chemical and petrochemical industries, the transport of chemical products and electrical and electronic components, such as electrode contacts in batteries, current arresters in alkaline fuel cells and electrodes for hydrogen production by electrolysis.

BÖHLER L276 is a nickel-chromium-molybdenum alloy with universal corrosion resistance unmatched by any other alloy. It has outstanding resistance to a wide variety of chemical process environments including ferric and cupric chlorides, hot contaminated mineral acids, solvents, chlorine and chlorine contaminated (both organic and inorganic), dry chlorine, formic and acetic acids, acetic anhydride, sea water and brine solutions and hypochlorite and chlorine dioxide solutions. BÖHLER L276 also resists formation of grain boundary precipitates in the weld heat affected zone making it useful for most chemical processes in the as-welded condition. BÖHLER L276 has excellent resistance to pitting and stress corrosion cracking. Some typical applications of BÖHLER L276 include equipment components in chemical and petrochemical organic chloride processes and processes utilizing halide or acid catalysts. Other industry applications are pulp and paper (digesters and bleach areas), scrubbers and ducting for flue gas desulfurization, pharmaceutical and food processing equipment.

BÖHLER L303 is a corrosion and heat resistant nickel alloy in the form of bars, forging and forging stock. The alloy’s high-temperature strength is derived from its solid solution strengthening elements of molybdenum, cobalt, and chromium, and its age-hardening elements, aluminum and titanium. Its strength and stability ranges are higher than those typically available for Alloy 718. It is widely used typically for rotating parts, such as compressor and gas turbine blades, disks, hubs, shafts bolts and spacers requiring high strength up to 1500°F (816°C) and oxidation resistance up to 1750°F (954°C) but usage is not limited to such applications.

Marine technique e.g. heat ex-changer and condenser up to 450°C which works with brackish- or sea water for cooling. Pickling baskets, chemical industry. Corrosion resistant nickel-copper alloy resistant to chloride induced stress corrosion cracking. No post-weld heat treatment required. Excellent resistance to steam, torrential sea water, neutral and alkaline salt solutions. Possesses very good resistance to acid reacted salt solutions like zinc-chloride, ammonium-sulphate or ammonium-chloride as well as non oxidising acids e.g. diluted sulphuric acid, hydrochloric acid, hydrofluoric acid, silicofluoric acid, clean phosphoric acid and organic acids.

Nickel-Chromium-Cobalt-Molybdenum-Alloy, used for gas turbin components and temperautes up to 1100°C.

BÖHLER L625 is a non-magnetizable corrosion and heat resistant nickel alloy in the form of bars, forgings and semi-finished products up to max 254 mm diameter/ cross-section and oxidation resistant up to 1093°C. Best fatigue strength and resistance to stress corrosion cracking when exposed to chloride containing media. Good weldability.

BÖHLER L718AMS is a corrosion and heat resistant nickel alloy – precipitation hardenable – in the form of bars, forging and forging stock. High resistance to creep and stress-rupture up to 1300°F (704°C) and oxidation resistance up to 1800°F (982°C). High duty parts and components for oil & gas and CPI applications, components for automotive, gas turbines, aerospace engines, high-speed airframe parts such as disks, buckets, spacers and high temperature bolts and fasteners.

BÖHLERL718 API (UNS N07718) is a high-strength, corrosion-resistant nickel-chromium-iron-molybdenum material with excellent corrosion resistance, especially in H2S and CO2 environments. The alloy is age-hardenable due to the addition of niobium, titanium and aluminium. BÖHLER L718 API is recognised by the oil industry for its simple and cost-effective production in combination with good tensile, fatigue, creep and fracture strength and is used in a wide range of applications in this sector. BÖHLER L718 API has excellent weldability and is resistant to cracking after welding. The material can be used at high temperatures. BÖHLER L718 API is available in the NACE/API 6A CRA versions with a minimum yield strength of 120/140 ksi and also in the high-strength version with 150 ksi. All hardness grades are suitable for sour service and can be used for pressurising and pressure-controlling equipment in corrosive environments. Typical applications include packers, pumps, connectors and fasteners as well as gate valves, throttle spindles, pipework hangers and fire safe valves, but also a wide range of downhole and completion components, nuclear and surface applications.

BÖHLER L718HCB is a corrosion and heat resistant nickel alloy – precipitation hardenable – in the form of bars, forging and forging stock. High resistance to creep and stress-rupture up to 1300°F (704°C) and oxidation resistance up to 1800°F (982°C). High duty parts and components for gas turbines, aerospace engines, high-speed airframe parts such as disks, buckets, spacers and high temperature bolts and fasteners. Compared to standard alloy 718 AMS limits, Cb in L718HCb is adjusted in the upper range of the standard limits in order to enhance mechanical properties. L718HCb is typically used for high temperature bolting and fasteners.

BÖHLER L725 (UNS N07725) is an age-hardenable nickel-chromium-molybdenum-niobium alloy with comparable corrosion resistance to Alloy 625. The strength of Bohler L725 in the age-hardened condition is approximately twice that of annealed Alloy 625 and comparable to Alloy 718. The high nickel and chromium content provides corrosion resistance in reducing and oxidizing environments, while the molybdenum content increases resistance to reducing media and offers high resistance to pitting and crevice corrosion. The combination of elements makes the alloy resistant to hydrogen embrittlement and stress corrosion cracking. BÖHLER L725 is also approved according to NACE MR0175 for use under sour gas conditions. The alloy was originally developed for oilfield applications such as wellheads and well completions, safety valves and other downhole components where it resists the effects of hydrogen sulfide, chlorides and carbon dioxide. The alloy is also attractive for pumps and propeller shafts as well as for high-strength fasteners and hydraulic couplings in marine applications subject to corrosion, pitting and crevice attack in seawater.

BÖHLER L825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium with exceptional resistance to many corrosive environments. The nickel content of BÖHLER L825 promotes resistance to chloride stress corrosion and, in combination with molybdenum and copper, offers significantly better corrosion resistance in reducing environments than conventional austenitic stainless steels. The chromium and molybdenum content provides resistance to pitting by chlorides as well as resistance to a wide range of oxidising atmospheres. The addition of titanium prevents sensitisation in the welded state and increases resistance to intergranular corrosion. The material can be used in a variety of process environments, including sulphuric, sulphuric, phosphoric, nitric, hydrofluoric and organic acids and alkalis such as sodium or potassium hydroxide and acidic chloride solutions. BÖHLER L825 can be easily formed and welded using a variety of techniques. BÖHLER L825 exhibits good toughness in continuous operation up to temperatures of around 550 °C and is suitable for pressure vessels with wall temperatures of up to 538 °C.

BÖHLER L925 (UNS N09925) is an age-hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium and aluminium and is designed for high strength and excellent corrosion resistance. The nickel content provides protection against chloride-ion stress corrosion cracking and, in combination with molybdenum and copper, also offers excellent resistance to reducing chemicals. Molybdenum aids resistance to pitting and crevice corrosion. The chromium content of the alloy ensures resistance in oxidising environments. The alloy exhibits a high degree of corrosion resistance in H2S and CO2 environments and is particularly suitable for sour (H2S-containing) crude oil, natural gas, sulphuric acid, phosphoric acid and seawater. BÖHLER L925 offers high strength and maintains this strength even at high temperatures. BÖHLER L925 meets the requirements of NACE MR0175 and API 6A CRA for acidic applications and can be used for pressure-maintaining and pressure-controlling equipment in corrosive environments. Typical applications include packers, safety valves, pumps, hangers, connectors, fasteners and numerous downhole and surface applications.

BÖHLER LHX is a corrosion and heat resistant nickel alloy in the form of bars, forging and forging stock. Resistant to oxidation up to 2200°F (1204°C) and high strength above 1500°F (816°C). It is widely used typically for parts, in engines especially for combustion chambers, after burners and exhaust components but usage is not limited to such applications.