Corrosion-Resistant Steels - Austenitic Steels and Non Magnetic Steels

A101 is an austenitic stainless Cr-Ni-Mo-steel with sulfur addition for improved machinability, ideal for the production of drilled and milled screenplates and –drums for the pulp and paper industry.

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 A220SC 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 750°F (400°C). 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 and biocompatibility. Cold forming properties are good. The steel is capable of taking a mirror finish. The steel is produced as a remelt grade and thus meets the usual requirements for steel purity as specified for implant material.

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 A405 is a stainless austenitic Cr-Ni-Mo steel with nitrogen content and extremely low carbon content. Resistant to intergranular corrosion up to 400°C. Heat treatment after welding is not required. Required surface finish: pickled. Very good cold formability. Very good polishability. The chemical composition has been optimised for specific use in urea systems. It is a modified austenitic stainless steel 310L with low carbon and silicon content and nitrogen addition to stabilise and strengthen the austenitic phase. The alloy has been specially developed for improved corrosion resistance properties in urea carbonate environments. The grade is also suitable for wet corrosive environments due to its high chromium, molybdenum and nitrogen content (PREN > 33). For components with the highest resistance requirements to boiling, concentrated nitric acid and solutions with a high chloride content at high temperatures, as well as for highly stressed systems in the urea industry, e.g. urea separators or complementary products (pipes, fittings, etc.).

A506 is an austenitic stainless Cr-Ni-Mo-steel with sulfur addition for improved machinability, ideal for the production of drilled and milled screenplates and –drums for the pulp and paper industry and for food processing industry.

Austenitic chromium-nickel-silicon steel with extra low carbon content. High corrosion resistance against highly concentrated nitric acid (80 – 99,5%) or nitric acid with additions of strong oxidiser. Resistant to intergranular corrosion up to 350 °C. Components in the chemical industry, e.g. heat exchanger, columns and acid refrigerators, Application temperature: -50°C up to 350°C, for transport and storage tanks max. 200°C.

Austenitic chromium-nickel-silicon steel with extra low carbon content. High corrosion resistance against highly concentrated nitric acid (80 – 99,5%) or nitric acid with additions of strong oxidiser. Resistant to intergranular attack up to 350 °C. Components in the chemical industry, e.g. heat exchanger, columns, acid refrigerators, transport and storage tanks. Application temperature: -50°C up to 350°C.

Austenitic chromium-nickel. Silicon steel with excellent corrosion resistance in sulfuric acid and nitric acid. Components in the chemical industry and fertilizer plants.

Austenitic chromium-nickel.silicon steel with excellent corrosion resistance in sulfuric acid and nitric acid. Components in the chemical industry and fertilizer plants.

Austenitic chromium-nickel stainless steel with excellent corrosion resistance in boiling nitric acid (concentration up to 80%). Fertiliser plants and production units for nitric acid, as well as for the reprocessing of nuclear fuel.

Aviation and aerospace industries, e.g.: washers

BÖHLER A750 is an austentic, corrosion and heat-resistant chromium nickel steel, niobium stabilized and solution treated. It have been used typically for parts requiring good corrasion resistance and which will be subjected to elevated temperatures during fabrication or in service and for parts requiring oxidation resistance up to 1500 °F (816°C), but usage is not limited to such applications. Compared to common 13% chromium steel, it offers higher corrosion resistance at lower strength and good weldability. No post-weld heat treatment required. The steel is resistant to atmospheric corrosion and the action of steam, water and acid as well as alkaline solutions. For optimum resistance, surfaces should be pickled or polished. Cold forming properties are very good. The steel is capable of taking a mirror finish.

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 A962RC (Alloy 904L, UNS N08904) is a super-austenitic stainless steel designed for a medium to high level of corrosion resistance. The alloy contains high levels of chromium and nickel with additions of molybdenum and copper to provide higher corrosion resistance in certain media. The alloy is produced to low carbon levels for use in the welded condition as in welded vessels and other large and complex fabrications. No post-weld heat treatment required. The high nickel (25%) and molybdenum (4.5%) contents of BÖHLER A962RC provide good resistance to chloride stress corrosion cracking. The Chromium, molybdenum and nickel levels provide general corrosion restistance and restistance to chloride pitting corrosion above the level of Types 316 and 317 in many media. The copper addition provides added resistance to reducing media such as hot phosphoric acid and dilute sulfuric acid.

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 A970 is a stainless austenitic CrNiMoCu steel with excellent resistance to pitting, crevice and stress corrosion cracking. It is also resistant to intergranular corrosion up to 400°C. Required surface finish pickled, scale-free heat treated or machined. For components subjected to highly corrosive conditions, e.g. in seawater-cooled plants and in offshore applications. In areas of the chemical industry where, at higher pressures and temperatures, there is exposure to pure acids as well as acids containing chlorine ions (especially sulphuric acid), organic acids and acid mixtures. Due to the increased resistance to crevice corrosion, it can also be used wherever the formation of deposits is to be expected or where crevices cannot be prevented by constructive measures.

BÖHLER P501 is a highly corrosion-resistant, nitrogen-strengthened Cr-Ni-Mo-N steel that is characterised by its resistance to corrosion in seawater and very good resistance to intergranular corrosion and stress corrosion cracking. Due to the alloy design, the yield strength is significantly higher than that of a comparable Cr-Ni-Mo stainless steels and a stable austenitic microstructure is achieved, so that the steel remains non-magnetisable even after cold forming and has the lowest magnetic permeability. In addition to its original application as a hull and structure for submarines, BÖHLER P501 is also used for magnetic shielding and components in the oil and gas industry, for example.

BÖHLER P504 is a wrought nitrogen strengthened 21chromium—10nickel—3manganese—2.5molybdenum stainless steel for surgical implants. It is a highly corrosion resistant non-magnetisable stainless austenitic steel – nitrogen alloyed – resistant to intergranular corrosion. Compared to standard Cr-Ni-Mo steel, it offers increased strength and thus also better fatigue properties. The steel is produced as remelt grade and thus fulfils the usual requirements for steel purity as specified for implant material.

BÖHLER P511 is a weldable, non-magnetic, austenitic steel with resistance to seawater and intergranular corrosion. This austenitic, stainless Cr-Ni-Mn-Mo-N steel has higher corrosion resistance than Cr-Ni-Mo grades 316, 316L, 317 and 317L and approximately twice the yield strength at room temperature. In addition, BÖHLER P511 has very good mechanical properties at both high and low temperatures. Unlike many austenitic stainless steels, it does not become magnetic when cold-formed or cooled to sub-zero temperatures. Thanks to its excellent notched impact strength at -196 °C (-320 °F), BÖHLER P511 is particularly suitable for low-temperature applications. Typical applications are found in the oil and gas, chemical, fertilizer, paper, textile, food and marine industries for components requiring a combination of excellent corrosion resistance and high strength, e.g. pumps, valves and fittings, fasteners, cables, chains, ship fittings, boat and valve shafts, heat exchanger parts and springs.

BÖHLER P513 is a weldable, non-magnetic, austenitic stainless steel with resistance to seawater and intercrystalline corrosion. It offers the best abrasion resistance of all stainless steels. The corrosion resistance of BÖHLER P513 is better than that of conventional austenitic Cr-Ni steels (type 304), and even better than Cr-Ni-Mo steel (type 316) under standard test conditions against chloride pitting, stress corrosion cracking and crevice corrosion. BÖHLER P513 is an alloy with a high silicon and manganese content and added nitrogen, which also works well at high temperatures around 1800 ºF. Silicon and manganese prevent wear and scuffing even in the annealed condition. Higher strengths can be achieved by cold forming, but this does not significantly improve abrasion resistance. BÖHLER P513 is used in the aerospace, food and pharmaceutical, oilfield, petrochemical, surgical and chemical industries, e.g. for valve stems and valve seats, fastening systems, shielding, chain drive systems, pins, bushings and roller bearings, wear rings and pistons in pumps.

BÖHLER P558 is a high-nitrogen 11% manganese-17% chromium-3% molybdenum-nickel stainless steel for surgical implants. Its metallurgical requirements include a fine-grained, austenitic microstructure without delta ferrite, low inclusion content, and resistance to intergranular corrosion. BÖHLER P558 also exhibits pitting and crevice corrosion resistance that is significantly better than the reference material in Specification F138 and exceeds the material values ​​specified in Specification F1314 and Specification F1586. Biocompatibility tests for this material have been positive and meet the requirements of the test standards used. The chemical composition of this steel features a high carbon content, along with high nitrogen content. The high carbon content is considered critical in the conventional metallurgy of chromium-nickel stainless steels, but the simultaneous alloying of nitrogen and carbon in BÖHLER P558 has a beneficial effect on the stabilization of the austenitic phase, extends the range of austenite stability to lower solution annealing temperatures, increases corrosion resistance, and leads to better toughness properties.

BÖHLER P570 is a non-magnetic, nickel-free, austenitic Cr-Mn-Mo-N stainless steel for high-quality watches, with excellent corrosion resistance. The high nitrogen content is responsible for good strength and ductility properties, both in the solution-annealed and cold-worked condition. This results in a stable austenitic microstructure without delta ferrite, sigma phase and other precipitates. In addition, a homogeneous structure and a high degree of purity are achieved by remelting processes. This in turn guarantees the best polishability. Due to the low nickel content, good biocompatibility is achieved. BÖHLER P570 has a high cold forming potential, high strength is already achieved with low cold forming.