
Produkte
Edelstahl-Hartlote auf Eisenbasis
Unsere rostfreien Hartlote auf Eisenbasis sind besonders beliebt für Anwendungen, bei denen herkömmliches Kupferlöten durch Edelstahllöten ersetzt wird. Dazu gehören Anwendungen wie Ölkühler und gelötete Plattenwärmetauscher (BPHE), bei denen der Kupfergehalt in der Endanwendung auf einem Minimum gehalten werden muss. In Umgebungen mit hohen Temperaturen und hoher Korrosion kann Kupfer in das Motoröl in einem Ölkühler oder in die Flüssigkeit in einem gelöteten Plattenwärmetauscher ausgelaugt werden. Bei Ölkühlern ist dies im Allgemeinen unerwünscht, da es die Leistung und Lebensdauer des Kühlsystems beeinträchtigt.
Für gelötete Komponenten für Trinkwasseranwendungen gelten strenge Vorschriften zur Begrenzung des maximal zulässigen Kupferionengehalts im Wasser, was die Verwendung anderer Hartlote erforderlich macht. Rostfreie Hartlote auf Eisenbasis besitzen einen besonderen technischen Vorteil, weil aus ihnen nur geringe oder nicht signifikante Mengen an Metallionen in das Trinkwasser ausgelaugt werden. In dieser Hinsicht sind sie den konventionellen Hartloten auf Nickelbasis und dem Kupferlöten überlegen.
BrazeLet® F300 und BrazeLet F86 sind Edelstahl-Hartlote auf Eisenbasis mit guten Benetzungseigenschaften bei Werkstoffen auf Edelstahlbasis im Vakuum oder in Schutzatmosphären. Der hohe Gehalt an legiertem Chrom (Cr) führt zu einer überlegenen Beständigkeit gegen Heißgas- und Säurekorrosion, wodurch sich die Legierungen zum Löten bei Anwendungen wie Wärmetauschern, Edelstahl-Ölkühlern für Nutzfahrzeuge und Abgasrückführungskühlern eignen. Die Hauptunterschiede zwischen den beiden Legierungen liegen in der Festigkeit der Lötverbindung und der empfohlenen Löttemperatur, wobei BrazeLet F86 eine höhere Festigkeit bietet als BrazeLet F300, aber etwas höhere Löttemperaturen erfordert.
Zusätzlich zu unseren standardmäßigen Edelstahl-Hartloten auf Eisenbasis verfügt Höganäs über die volle Kompetenz und Erfahrung, um in Zusammenarbeit mit unseren Kunden spezifische Legierungen zu entwickeln, wenn die Anwendung dies erfordert. Bitte kontaktieren Sie uns, wenn Sie Bedarf an einem Hartlot haben, dessen Eigenschaften von unserem bestehenden Produktportfolio abweicht.
BrazeLet® Hartlote auf Eisenbasis
BrazeLet F300-20
BrazeLet® F300-20 ist ein einzigartiges rostfreies Hartlot auf Eisen-Chrom-Basis für Anwendungen in extremen Umgebungen. Seine einzigartige chemische Zusammensetzung bietet eine ähnliche Korrosionsbeständigkeit und Verbindungsfestigkeit wie hochleistungsfähige Hartlote auf Nickelbasis. Durch die Verwendung von kostengünstigeren Metallen ist es eine kosteneffiziente Alternative.
BrazeLet F300-20 hat hervorragende Benetzungseigenschaften, eine niedrige Löttemperatur und bildet eine gleichmäßige Verbindung mit hoher Festigkeit und hoher Korrosions- und Oxidationsbeständigkeit. Daher eignet sich das Hartlot für Wärmetauscher in der Industrie und im Automobilsektor.
Die erste Wahl für die steigende Nachfrage nach kupferfreiem Löten, z. B. für Trinkwasseranwendungen und Ölkühler.
Vorteile
- Kosteneffizient
- Flexibilität bei großen Spalten
- Korrosionsbeständig
- Hohe Festigkeit
Zusammensetzung
ISO 3677, B-Fe39CrNiCuPSi-1000/1070
Zulässige Verunreinigungen gemäß ISO 17672
Zulässige Verunreinigungen gemäß ANSI/AWS A5.8
Schmelztemperatur
1000-1070°C
Min. Löttemperatur
1100°C
BrazeLet F300DW-9007
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 Solvent type: Water |
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BrazeLet F300DW-9201
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 Solvent type: Water-born |
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BrazeLet F300P-9012
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 Solvent type: Oil |
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BrazeLet F300R-9003
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 Solvent type: Oil |
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BrazeLet F86
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 |
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