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Low Carbon Type LEX

Features

Low thermal expansion over a wide temperature range

Low thermal expansion and improved machine workability.
Low defect and better internal quality can be obtained by forging process.

We have developed a range of practical casting alloys with vastly improved machinability characteristics (a common drawback of low-carbon alloy materials). These are used to make low-carbon low thermal expansion casting products that cause less tool wear than super invar.

Low carbon LEX-series

Property LEX-ZERO LEX-SF1 LEX-IF1 LEX-35E+
Characteristics Zero expansion Super low
expansion
Low expansion High Young's modulus
Thermal expansion coefficient
ppm/K (20∼25°C)
0±0.19 ≦0.8 ≦1.5 3.0~4.0
Minimum exposure temperature °C -30 -30 -196 -50
0.2% proof stress MPa 264 227 212 373
Tensile strength MPa 378 372 357 445
Elongation % 28 30 32 17
Hardness HB 137 133
Young’s modulus GPa (resonance method) 133 128 125 157
Poisson’s ratio 0.29 0.29 0.29
Density Mg/m3 8.1 8.1 8
Specific heat J/(g-K) 0.48 0.47
Thermal conductivity W/(mK) 13.8 13.1 13.5
Magnetic properties Magnetic
properties
70e 0.69 0.72
350e 1.17 1.06
Magnetic flux density 0.27 0.28
Coercive A/m 73.5 53.4
Maximum permeability 1672 2218

Typical products

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