Expansion Alloys

4J50 Strips: 590–700 MPa Tensile and Excellent Formability and Thermal Stability Product Overview Expansion Alloy 4J50 Strips (UNS K94610) are wrought Fe–Ni–Co alloys formulated to match the CTE of soft sealing glasses and ceramics. Their optimized chemistry—Ni 50.5 %, Mn 0.60 %, Si 0.30 %, C 0.05 %, Cr 0.25 %, P 0.025 %, S 0.025 %, Al 0.10 %, Co 1.0 %, balance Fe—yields a stable CTE of 9.8 × 10⁻⁶ /°C from 20 → 100 °C rising gently to 10.6 × 10⁻⁶ /°C at 600 °C, ensuring

4J33 Strips: Low-Expansion Ceramic Seal and Excellent Formability Product Overview Expansion Alloy 4J33 Strips (UNS K94610) are wrought iron-nickel-cobalt alloys tailor-made for glass-to-metal and ceramic-to-metal sealing. Their precise chemistry—32.1–33.6 % Ni and 14.0–15.2 % Co, with C, P, S ≤ 0.05 %—creates a CTE of 6.3 × 10⁻⁶ /°C (20–400 °C) to 8.5 × 10⁻⁶ /°C (20–600 °C), closely matching 95 % Al₂O₃ ceramics and minimizing thermal mismatch stresses. In the annealed “soft”

4J29 Strips: Precision Expansion Control and Vacuum-Seal Performance Product Overview Expansion Alloy 4J29 Strips (UNS K94610) are wrought iron-nickel-cobalt alloys designed for high-integrity glass-to-metal sealing applications. Their precise 29 % Ni and 17 % Co matrix balances thermal expansion to match hard glass and ceramic (5.0 × 10⁻⁶/°C at 20–300 °C; 5.2 × 10⁻⁶/°C at 20–450 °C), minimizing thermal stress during cycling. Trace controls of carbon, phosphorus, and sulfur

Expansion Alloy 4J28 Strips: Glass-Seal Expansion Matching and Corrosion Resistance Product Overview Expansion Alloy 4J28 Strips (Alloy 27) are precision-rolled iron-chromium strips formulated to closely match the coefficient of thermal expansion of typical soft sealing glasses, ensuring hermetic, stress-free bonds between metal and ceramic or glass. Between – 50 °C and 400 °C, 4J28 exhibits a mean linear expansion coefficient of approximately 4–8 × 10⁻⁶ /°C, minimizing

Expansion 4J50 Pipes Controlled Expansion Alloy Expansion 4J50 Pipes are precision iron-nickel alloy pipes engineered for applications requiring controlled thermal expansion and reliable dimensional stability across varying temperature conditions. Containing approximately 50% nickel, these pipes provide a coefficient of thermal expansion that closely matches specific hard glasses and ceramic materials, making them highly suitable for glass-to-metal sealing assemblies and

Expansion K93603 / 4J28 Pipes Ultra Low Expansion Alloy Expansion K93603 / 4J28 Pipes are precision iron-nickel-cobalt alloy pipes engineered for applications where extremely low thermal expansion is critical. Known internationally as Super Invar Alloy, this material was developed to achieve significantly lower dimensional change than conventional Invar alloys during temperature fluctuations. The addition of cobalt optimizes the crystal structure and reduces thermal expansion