Chemical Industry - General

BÖHLER A204 is a stainless austenitic Cr-Ni-Mo steel with a low carbon content, highly polishable and good cold formability. Good resistance to body perspiration, reducing acids such as diluted sulphuric and hydrochloric acid and to localized corrosion attack in media containing chlorine ions. Resistant to intergranular corrosion up to 400°C. Application for the watch and jewelry industry as well as mechanical and apparatus engineering.

BÖHLER A220 is a low carbon, chromium-nickel-and molybdenum steel. Structure homogeneous, stable austenite. Weldable with analogous filler metal giving fully austenitic deposit. Resistant to intergranular corrosion in the temperature range up to 400°C. Does not require post-weld heat treatment. Resistance to acids having a reducing effect, like diluted sulphuric acid and hydrochloric acid is good. The steel is not susceptible to pitting, crevice and stress corrosion cracking in media containing chloride ions and possesses excellent resistance to the attack of urea. For optimum resistance, surfaces should be pickled. Cold forming properties are good. The steel is capable of taking a mirror finish. Components for urea plants, pump heads, valve stems, condensers, reactors, strippers, scrubbers. Equipment and parts in the dyeing industry, textile, paper and leather, chemical, pharmaceutical and synthetic fibre industries.

BÖHLER A224 is a stainless austenitic Cr-Ni-Mo steel with low carbon content. Resistant to intergranular corrosion up to 750°F (400°C). Heat treatment after welding not required. Good resistance to reducing acids, such as diluted sulfuric and hydrochloric acid, and to localized corrosion attack in media containing chlorine ions. Required surface finish pickled or polished. Very good cold formability, highly polishable.

BÖHLER A903 (UNS S32205) is the most common stainless ferritic-austenitic Cr-Ni-Mo steel with nitrogen addition. In addition to good strength properties, this steel offers high corrosion resistance, especially against stress corrosion cracking in chloride-containing solutions, and is resistant to intergranular corrosion up to 300°C. The alloy should not be used at temperatures above 300°C due to embrittlement. Heat treatment after welding is not necessary. Required surface finish: pickled, scale-free heat treated or machined. Commonly used in the oil and gas industry, hydroelectric power, pressure vessels, pulp and paper industry, components and chemical tanks, such as parts for separators and heat exchangers and parts in the paper industry, oil and gas extraction , compressors, seawater desalination.

BÖHLER A911SA is a ferritic-austenitic stainless steel of Type 25%Cr with PREN of min. 40. It offers excellent corrosion resistance against general corrosion, stress corrosion cracking, corrosion fatigue, pitting, crevice and erosion corrosion and possessing very high mechanical strength properties. However, it contains less copper compared to other super Duplex SS but a deliberate addition of tungsten instead, claimed to selectively improve corrosion resistance. Good weldability, post weld heat treatment not necessary. Max. temperature for long periods of service: 280°C (535°F ) / (300°C/570°F possible for short periods). Surface condition for optimum corrosion resistance: pickled or machined. Components in offshore, waste water, sea water desalination and chemical plants with aggressive chloride-containing media e.g. heat exchangers, separator parts, compressor and pump components, turbine blades.

Bohler A913 (UNS S32750) is the most widely used super duplex grade on the market and is a 25%Cr ferritic-austenitic stainless steel with PREN min 41. The steel offers highest corrosion resistance and good strength properties and is especially suitable for use in aggressive environments containing chlorides. Good weldability, heat treatment after welding is not required. Excellent resistance to general corrosion, stress corrosion cracking, vibration cracking, pitting and crevice corrosion as well as erosion corrosion. Max. operating temperature for long-term use: 280°C (short-term exceeding up to 300°C permissible). Required surface finish: pickled or machined. Components exposed to seawater such as heat exchangers, feed or injection pumps, propeller shafts, highly stressed parts in chemical and waste water plants and for oil and gas production (e.g. manifolds), separators, turbine and fan blades, low-pressure compressor components.

BÖHLER A959 (Alloy 28, UNS N08028, W. Nr. 1.4563) is a nickel-iron-chromium alloy with additions of molybdenum and copper. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. The alloy is especially resistant to sulphuric and phosphoric acid. Equipment used for chemical processing, pollution control equipment, oil and gas well piping ,natural gas and oil transportation, nuclear fuel reprocessing and transportation, acid production and pickling equipment and transportation The alloy was originally developed for use in the manufacture of phosphoric acid, especially for heat exchangers in the concentration unit, where corrosive conditions are at their worst.

BÖHLER A965SA is an austenitic stainless steel alloy with 6% molybdenum and nitrogen. It has very high resistance to crevice and surface corrosion and was specially developed for the requirements of the chemical industry, the pulp and paper industry and the oil/gas industry. Due to its PREN value of over 40, the material is particularly resistant to seawater and is therefore often used in offshore technology. Furthermore, BÖHLER A965SA is resistant to intergranular corrosion up to 400°C. The required surface finish is pickled, scale-free heat treated or machined. For applications in highly corrosive environments due to chemically aggressive media, e.g. for equipment and installations cooled with seawater and parts for offshore installations. In the chemical industry, where resistance to attack by pure acids as well as chloride ion-containing acids (especially sulphuric acid), organic acids and mixed acids in the higher pressure and temperature range is required. The increased resistance to crevice corrosion also allows the use where incrustations must be expected and / or where the formation of crevices cannot be avoided by constructive measures.

BÖHLER H500RB (Alloy 800, 800HT) is an austenitic, high-temperature iron-nickel-chromium alloy with good creep rupture strength at temperatures above 600°C. This material also has good resistance in oxidising, carburising and sticking atmospheres with good workability.  With a nickel content of more than 30%, this material has little tendency to precipitate sigma phase. In addition to the good mechanical long-term properties, BÖHLER H500RB is resistant to oxidation and carburisation up to approx. 1000°C. In certain temperature ranges, it shows resistance to sulphurous media. The original Alloy 800 is increasingly being replaced in the market by the variants 800H and HT. These can be solution annealed and therefore have improved creep rupture properties at high temperatures. The material BÖHLER H500RB fulfils the properties of Alloy 800 as well as Alloy 800H and 800HT by controlled contents of carbon, aluminium, titanium, silicon and manganese as well as controlled sum content of Al + Ti. In the case of Alloy 800H and HT, special solution annealing significantly increases the creep rupture strength at temperatures above 600°C.

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.

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.

BÖHLER N400 is a stainless soft martensitic Cr steel with 4% nickel with molybdenum addition and medium corrosion resistance in media with only a low chloride content. To achieve the best possible corrosion resistance with BÖHLER N400, it is essential to polish the surfaces concerned. Good mechanical properties in the quenched and tempered condition. This makes this material very suitable for use in turbine and power plant construction. Very good low-temperature properties. Recommended temperature of use: – 60 to 350°C. Use for valves, pumps, compressors, centrifuges, hydroelectric machines, turbines, reactor technology, shipbuilding, chemicals. Special heat treatment to max. 23 HRC is required for sour gas enviroment in petroleum engineering.

BÖHLER N404 is a stainless, soft martensitic Cr steel with 5% nickel and molybdenum addition with higher corrosion resistance than that of stainless steels of type 1.4313. The molybdenum addition also permits limited use in the maritime sector. BÖHLER N404 is particularly insensitive to intergranular corrosion and very resistant to fatigue and stress corrosion cracking and offers good mechanical properties in the quenched and tempered condition. This makes this material very suitable for use in the oil and gas sector, e.g. for fittings, pumps, compressors, centrifuges, hydropower machinery, reactor technology, shipbuilding, chemicals, petroleum technology, aviation and refrigeration technology. Very good low-temperature properties. Recommended application temperature from – 60 to 350°C. Special heat treatment to max. 23 HRC is required for sour gas stress in petroleum technology. In order to achieve the best possible corrosion resistance, the relevant surfaces must be polished.

BÖHLER N425 (UNS S41427) – Super 13Cr – is a martensitic stainless steel with a nickel content of approx. 5% and 2% molybdenum, with excellent corrosion resistance in a CO2 environment and at low concentrations of chlorides and H2S and is more resistant than comparable 13%Cr steels. The steel is particularly resistant to intergranular corrosion and stress corrosion cracking, is easy to weld and offers good mechanical properties in the quenched and tempered condition even at low temperatures. Recommended application temperature from – 60 to 350°C. The material is specially tested for toughness and behavior under sour gas load. In order to achieve the best possible corrosion resistance, it is essential to polish the relevant surfaces. BÖHLER N425 is available with a minimum yield strength of 95 ksi and maximum hardness of 29 HRC, making it suitable for limited NACE oxygen applications and also available as a 110 ksi version for standard and CO2 applications. This material is used in downhole completion tools for components such as packers, safety valves and other applications.

BÖHLER T200 covers a corrosion and heat resistant steel in the form of bars, wire, forgings and forging stock. It is an austenitic, precipitation hardenable, iron-nickel-chromium-molydenum-titanium steel of ESR quality. Alloying elements of aluminium and titanium allow this material to undergo precipitation hardening (ageing) through the formation of intermetallic phases. The addition of molybdenum increases the mechanical properties and resistance to creep at high temperatures. These products are typically used for parts in the oil and gas industry requiring moderate strength up to 704 °C (1300 °F) and oxidation resistance up to 816 °C (1500 °F), but their use is not limited to such applications.