Produtos

Produtos

Metais de adição para brasagem inoxidável à base de ferro

Os metais de adição inoxidáveis para brasagem à base de ferro da Höganäs são uma alternativa econômica aos materiais de adição para brasagem à base de níquel e possuem propriedades materiais semelhantes, tais como resitência mecânica e resistência à corrosão, ao mesmo tempo em que não são vulneráveis a preços flutuantes do níquel.

Os nossos metais de adição inoxidáveis para brasagem à base de ferro são particularmente populares para aplicações nas quais a brasagem convencional de cobre é substituída pela brasagem de aço inoxidável. Essas aplicações incluem os resfriadores de óleo e trocadores de calor a placas brasadas (BPHE), onde há necessidade de manter o teor de cobre em um nível mínimo na aplicação final. Em ambientes corrosivos e sob altas temperaturas, pode ocorrer a lixiviação de cobre no óleo do motor de um resfriador de óleo ou no fluido em um trocador de calor com placa brasada. Nos resfriadores de óleo, isso geralmente é indesejado pois afeta o desempenho e a vida útil do sistema de resfriamento.

No caso de componentes brasados para aplicações de água potável, existem regulamentações rigorosas para limitar o teor máximo permitido de íons de cobre na água, que impulsiona a necessidade de usar outros metais de adição para brasagem. Os metais de adição inoxidáveis para brasagem à base de ferro mostraram uma vantagem técnica específica, com quantidades baixas ou insignificantes de lixiviação de íons metálicos em água potável, superando tanto os metais de adição convencionais à base de níquel quanto a brasagem com cobre.

O BrazeLet® F300 e o BrazeLet F86 são metais de adição inoxidáveis para brasagem à base de ferro, com boas propriedades de molhabilidade em materiais de base feitos de aço inoxidável em atmosferas protetores ou a vácuo. Os altos níveis de cromo ligado (Cr) resultam em uma resistência superior ao gás quente e à corrosão por ácido, o que torna as ligas adequadas para a brasagem de aplicações tais como trocadores de calor, resfriadores de óleo inoxidáveis para veículos comerciais e resfriadores de recirculação de gás de escape. As principais diferenças entre as duas ligas são encontradas na resistência da junta brasada e na temperatura de brasagem recomendada, onde o BrazeLet F86 oferece uma resistência mais alta do que o BrazeLet F300, mas requer temperaturas de brasagem um pouco mais altas.

Além de nossos metais de adição para brasagem à base de ferro já existentes, a Höganäs também possui plena capacidade e experiência para desenvolver ligas específicas, em cooperação com nossos clientes, caso seja exigido pela aplicação. Entre em contato conosco se precisar de um metal de adição para brasagem com propriedades diferentes das existentes no portfólio de produtos.

Metais de adição para brasagem à base de ferro BrazeLet®

O BrazeLet® F300-20 é um metal de adição inoxidável para brasagem à base de cromo e ferro , ideal para aplicações usadas em ambientes extremos. Sua exclusiva composição química oferece uma resistência à corrosão e propriedades de resistência da junta similares às dos metais de adição de alto desempenho à base de níquel. No entanto, é uma alternativa mais econômica, graças ao uso de metais que custam menos.

O BrazeLet F300-20 possui excelentes propriedades de molhabilidade, baixa temperatura de brasagem e cria uma junta uniforme com alta resistência à corrosão e oxidação, o que o torna ideal para aplicações que envolvam trocadores de calor no setor industrial e automotivo.

É a primeira escolha para as demandas cada vez maiores da brasagem isenta de cobre, tal como para aplicações de água potável e refrigeradores a óleo.

Vantagens

  • Econômico
  • Flexibilidade em aberturas grandes
  • Resistência à corrosão
  • Alta resistência

Composição

ISO 3677, B-Fe39CrNiCuPSi-1000/1070
Impurezas de acordo com a norma ISO 17672
Impurezas de acordo com a norma ANSI/AWS A5.8

Temperatura de fusão

1000-1070°C

Temperatura mín. de brasagem

1100°C

Iron-based brazing alloy

Höganäs’ unique and patented iron-chromium based stainless brazing alloy BrazeLet F300-20 offers excellent wetting properties and great corrosion resistance particularly developed for brazing of stainless steel materials in vacuum or protective atmospheres (dry hydrogen or argon). With excellent wetting properties, low brazing temperature and high corrosion and oxidation resistance it is a good choice for automotive and industrial heat exchangers. It is well suited for drinking water applications with strict requirements on metal ion leaching. Compared to nickel-based brazing alloys it offers a more attractive and stable cost. Compared to most of the standard nickel-based brazing alloys, BrazeLet F300-20 is able to fill larger gaps without brittle phase lines or cracks, which leads to a more reliable and safe brazing as well as more flexibility in part tolerances.

The water-based brazing paste BrazeLet F300DW-9007 can be used for dispensing applications, typically found on heat exchanger inlet and outlet tubes, housing to core joints and hole plates to tube joints. It dries quickly and sticks to all bevel and vertical positions without the need of pre-drying. It can be easily removed with water. The paste has a very low polymer content and the binder is specially designed to decompose cleanly at low temperatures, as to minimise need for furnace maintenance, while preventing pre-oxidation of brazing filler metal powder in marginal furnace atmospheres. It shows extremely good residue-free brazing results in both vacuum and continuous belt furnace brazing. 

BrazeLet F300DW-9007 properties allow reliable application in a wide speed range as a result of the dispensing equipment / automatisation as well as the needle diameter. The paste can be delivered in cartridges for use in automated applications or different sized cans. It can be frozen and brought back to room temperature for use without any damage to its properties.

     
 

Nominal composition: Fe – 20Ni – 20Cr – 7P – 6.5Cu – 4Si 
Powder type: Gas atomised
Melting range: 1025 – 1060 °C
Minimum brazing temperature: 1100 °C
Recommended gap clearance: 25 – 150 µm
Applicable specifications: ISO 3677 B-Fe42CrNiPCuSi-1025/1060

Solvent type: Water
Metal content: 90 wt%
Particle size: <106 µm
Recommended drying temperature: RT – 170 °C (RT – 340 °F)
Evaporation temperature of binder: 250 – 300 °C (480 – 570 °F)
Typical Brookfield viscosity (2.5 rpm @ 20 °C): 1000 Pas (T-spindle E)
Typical density: 4.5 g/cm3

 
     
Iron-based brazing alloy

Höganäs’ unique and patented iron-chromium based stainless brazing alloy BrazeLet F300-20 offers excellent wetting properties and great corrosion resistance particularly developed for brazing of stainless steel materials in vacuum or protective atmospheres (dry hydrogen or argon). With excellent wetting properties, low brazing temperature and high corrosion and oxidation resistance it is a good choice for automotive and industrial heat exchangers. It is well suited for drinking water applications with strict requirements on metal ion leaching. Compared to nickel-based brazing alloys it offers a more attractive and stable cost. Compared to most of the standard nickel-based brazing alloys, BrazeLet F300-20 is able to fill larger gaps without brittle phase lines or cracks, which leads to a more reliable and safe brazing as well as more flexibility in part tolerances.

The brazing paste BrazeLet F300DW-9201 can be used for dispensing applications, typically found on heat exchanger inlet and outlet tubes, housing to core joints and hole plate to tube joints. It can be dispensed by using standard air pressure dispensing units. For better precision, screw dispense units are recommended. The paste sticks on all bevel positions without the need of pre-drying but is easily removed using water. The paste formulation offers the highest metal content of our standard dispensing pastes.

BrazeLet F300DW-9201 properties allow reliable application in a wide speed range as a result of the dispensing equipment / automatisation as well as the needle diameter. The paste can be delivered in cartridges for use in automated applications or different sized cans for refilling of smaller cartridges for manual applications. For best performance, it is recommended to first stir the paste.

     
 

Nominal composition: Fe – 20Ni – 20Cr – 7P – 6.5Cu – 4Si 
Powder type: Gas atomised
Melting range: 1025 – 1060 °C
Minimum brazing temperature: 1100 °C
Recommended gap clearance: 25 – 150 µm
Applicable specifications: ISO 3677 B-Fe42CrNiPCuSi-1025/1060

Solvent type: Water-born
Metal content: 92 wt%
Particle size: <106 µm
Recommended drying temperature: 120 – 150 °C (250 – 300 °F)
Evaporation temperature of binder: 300 – 400 °C (570 – 750 °F)
Typical Brookfield viscosity (2.5 rpm @ 20 °C): 1000 Pas (T-spindle E)
Typical density: 4.6 g/cm3

 
     
Iron-based brazing alloy

Höganäs’ unique and patented iron-chromium based stainless brazing alloy BrazeLet F300-20 offers excellent wetting properties and great corrosion resistance particularly developed for brazing of stainless steel materials in vacuum or protective atmospheres (dry hydrogen or argon). With excellent wetting properties, low brazing temperature and high corrosion and oxidation resistance it is a good choice for automotive and industrial heat exchangers. It is well suited for drinking water applications with strict requirements on metal ion leaching. Compared to nickel-based brazing alloys it offers a more attractive and stable cost. Compared to most of the standard nickel-based brazing alloys, BrazeLet F300-20 is able to fill larger gaps without brittle phase lines or cracks, which leads to a more reliable and safe brazing as well as more flexibility in part tolerances.

The brazing paste BrazeLet F300P-9012 is typically in use for printing thick paste layers of about 0.2 to 0.6 mm on flat parts or on top of structured parts by use of screens or stencils. A typical application is printing of paste on hole plates of tube bundled heat exchangers. The use of rubber squeegees is recommended. Reliable printing requires precise positioning fixture tool by use of vacuum table or clamping device. Typical printing speed is 100 mm/s. Thin printing lines should at least have a width twice the printing thickness and the small dots diameter should be three times the printing thickness or greater. Printing accuracy is very precise as the paste maintains its shape during drying. 

The solvent based BrazeLet F300P-9012 increases productivity wherever drying of the paste is an issue. It has no settlement, and no stirring is needed in the equipment. However, when opening a can from stock it is always recommended to stir the paste. The printed parts can be dried with standard drying process (hot air) at 120 – 170 °C. Here, the drying time needs to be established as it varies depending on thermal mass, parts design and the used furnace. After drying, the paste has excellent adhesion to the metal sheet.

     
 

Nominal composition: Fe – 20Ni – 20Cr – 7P – 6.5Cu – 4Si 
Powder type: Gas atomised
Melting range: 1025 – 1060 °C
Minimum brazing temperature: 1100 °C
Recommended gap clearance: 25 – 150 µm
Applicable specifications: ISO 3677 B-Fe42CrNiPCuSi-1025/1060

Solvent type: Oil
Metal content: 90 wt%
Particle size: <106 µm
Recommended drying temperature: 120 – 170 °C (250 – 340 °F)
Evaporation temperature of binder: 350 – 450 °C (660 – 840 °F)
Typical Brookfield viscosity: (2.5 rpm @ 20 °C): 300 Pas (T-spindle D)
Typical density: 4.0 g/cm3

 
     
Iron-based brazing alloy

Höganäs’ unique and patented iron-chromium based stainless brazing alloy BrazeLet F300-20 offers excellent wetting properties and great corrosion resistance particularly developed for brazing of stainless steel materials in vacuum or protective atmospheres (dry hydrogen or argon). With excellent wetting properties, low brazing temperature and high corrosion and oxidation resistance it is a good choice for automotive and industrial heat exchangers. It is well suited for drinking water applications with strict requirements on metal ion leaching. Compared to nickel-based brazing alloys it offers a more attractive and stable cost. Compared to most of the standard nickel-based brazing alloys, BrazeLet F300-20 is able to fill larger gaps without brittle phase lines or cracks, which leads to a more reliable and safe brazing as well as more flexibility in part tolerances.

The brazing paste BrazeLet F300R-9003 can be used for roller coating fins or structured plates, typically found in flat heat exchanger designs. Depending on type of roller used the paste can be applied with thin layers either on top or on the side of the fin tips. Gap size between the paste roll and the scraper of 0.08 – 0.12 mm is recommended. The amount of paste is controlled by weight and is a function of the fins or structured plate design. BrazeLet F300R-9003 properties allow reliable application in a wide range of coating speeds, tested with good results from 3 m/min up to 20 m/min. The oil-based paste ensures reliable coating over time without drying on the roll. BrazeLet F300R-9003 has higher metal content and lower binder content compared to standard roller coating pastes, which decreases packaging and transportation needs for the same amount of brazing filler metal.

The coated fins can be dried with standard drying process (hot air) at 120 – 170 °C. The drying time depends on thermal mass, parts design and the used furnace and thus needs to be established. When dried, the paste has excellent adhesion to the metal sheet.

     
 

Nominal composition: Fe – 20Ni – 20Cr – 7P – 6.5Cu – 4Si 
Powder type: Gas atomised
Melting range: 1025 – 1060 °C
Minimum brazing temperature: 1100 °C
Recommended gap clearance: 25 – 150 µm
Applicable specifications: ISO 3677 B-Fe42CrNiPCuSi-1025/1060

Solvent type: Oil
Metal content: 90 wt%
Particle size: <63 µm
Recommended drying temperature: 120 – 170 °C (250 – 340 °F)
Evaporation temperature of binder: 350 – 450 °C (660 – 840 °F)
Typical Brookfield viscosity: (2.5 rpm @ 20 °C): 100 Pas (T-spindle C)
Typical density: 4.0 g/cm3

 
     
Iron-based brazing alloy

Höganäs’ unique iron-chromium based stainless brazing alloy BrazeLet F86 provides high strength joints when brazing stainless steel materials in vacuum or protective atmospheres (dry hydrogen or argon). The brazing alloy is particularly well suited for brazing heat exchangers with strict requirements on corrosion resistance and metal ion leaching, for example in drinking water or purified water applications, and it is completely copper free. Compared to nickel-based brazing alloys it offers a more attractive and stable cost. Compared to most of the standard nickel-based brazing alloys, BrazeLet F86 is able to fill larger gaps without brittle phase lines or cracks, which leads to a more reliable and safe brazing as well as more flexibility in part tolerances.

     
 

Nominal composition: Fe – 29Cr – 18Ni – 6.5Si – 6P – 0.5Nb
Powder type: Gas atomised
Melting range: 1050 – 1100 °C
Minimum brazing temperature: 1150 °C
Recommended gap clearance: 25 – 150 µm
Particle size distribution: -106 (F) µm, -63 µm
Applicable specifications: ISO 3677 B-Fe40CrNiSiP(Nb)-1050/1100

 
     

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