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ステンレス系ろう付け合金

Höganäs の鉄基ステンレス鋼ろう付け材料は、ニッケル基ろう付け材料に代わる コスト効率の高い合金です 。また、 ニッケル価格の変動に対して敏感ではなく、強度や耐食性などで同様の材料特性を備えています。

ステンレス系ろう付け合金は、特に従来の銅ろう付けをステンレス鋼ろう付けに置き換える用途で有名です。これには、銅の含有量を最終用途で最小レベルに保つ必要がある、オイルクーラーやろう付けプレート熱交換器(BPHE)などの用途が含まれます。高温の腐食性環境では、オイルクーラー内でエンジンオイルに銅イオンが浸出する、またはろう付けプレート熱交換器の液体に銅イオンが浸出するリスクがあります。オイルクーラーの場合、冷却系統の性能と寿命に影響を与えるため、銅イオンの浸出は一般的に望ましくない現象です。

飲料水用のろう付け部品では、水に含まれる銅イオンの最大許容含有量を制限する厳しい規制が設けられており、代替ろう付け材料の必要性が加速しています。ステンレス系ろう付け合金は、飲料水に対する金属イオン浸出に対する技術的利点があるため、従来のニッケルや銅ろう付け材の両方と比較して優れています。

BrazeLet® F300 および BrazeLet F86 は、真空または保護雰囲気におけるステンレス鋼基材に良好な濡れ性を有する、ステンレス系ろう付け合金です。高レベルの合金化クロム(Cr)は、優れた高温ガスおよび耐酸性耐食性をもち、熱交換器、商用車のステンレスオイルクーラー、EGRクーラーなどのろう付け用途に適しています。2つのろう材の主な違いは接合部強度と、推奨ろう付け温度です。BrazeLet F86 は BrazeLet F300 よりも高い接合部強度を提供しますが、ろう付け温度を若干高くする必要があります。

Höganäs は、標準的なステンレス鋼ろう付け合金に加えて、要望に応じて、お客様と協力してカスタマイズした合金を開発する能力と経験があります。既存の製品ポートフォリオとは異なる特性を持つろう付け材料が必要である場合は、お気軽にお問い合わせください。

BrazeLet® ステンレス系ろう付け合金

BrazeLet® F300-20は、極限環境で動作する部品用の独自のステンレス基(鉄クロム合金)ろう付け材料です。 独自の化学組成は、ニッケル基の高性能ろう付け材料と同様の耐食性や接合強度などの特性を提供しますが、 より低コストの金属を使用するため、費用対効果の高い代替手段となります。

BrazeLet F300-20は優れた濡れ性、低いろう付け温度、高強度で耐食性および耐酸化性の高い均一な接合部を形成するため、一般産業用や自動車用の熱交換器用途に適しています。

飲料水やオイルクーラーなどの用途で、銅を含有しないろう付けの需要が増加しています。本製品は、このような用途における第一の選択肢です。

特長

  • 費用対効果が高い
  • 様々な接合幅に対応
  • 耐食性
  • 高い強さ

成分

ISO 3677、B-Fe39CrNiCuPSi-1000/1070
不純物はISO 17672
ANSI/AWS A5.8の規格に準拠

溶融温度範囲

1000~1070°C

最低ろう付け温度

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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