因瓦钢又称低膨胀合金,在我国航空材料牌号中是4J36(Ni—36％)、4J32(Ni—32％)。它们的特点是在-60°～100℃范围内,具有很低的膨胀系数,而塑性良好。常用来制造在温度变化时,尺寸要求近似恒定的元件。按下列规范处理时,它的膨胀系数仅为钢的十分之一: α=0～1.5×10~(-6)(-60～100℃) 这种材料在熔炼和轧制时都比较困 Inva Steel, also known as low-expansion alloy, is 4J36 (Ni-36%) and 4J32 (Ni-32%) in China’s aviation material grades. Their characteristics are in the range of -60 ° ~ 100 ℃, with a low expansion coefficient, and good plasticity. Commonly used to create the temperature changes, the size requirements of approximately constant components. Its coefficient of expansion is only one-tenth that of steel when it is subjected to the following specifications: α = 0 to 1.5 × 10 -6 (- 60 to 100 ° C) This material is relatively difficult to melt and roll