STAINLESS STEEL SUBSTRATE FOR SOLAR CELL HAVING SUPERIOR INSULATING PROPERTIES AND LOW THERMAL EXPANSION COEFFICIENT AND METHOD OF PRODUCING THE SAME

摘要

Provided is a stainless steel substrate for a solar cell, the stainless steel substrate including, by mass %, Cr: 9% to 25%, C: 0.03% or less, Mn: 2% or less, P: 0.05% or less, S: 0.01% or less, N: 0.03% or less, Al: 0.005% to 5.0%, Si: 0.05% to 4.0%, and a remainder including Fe and unavoidable impurities, in which an oxide film containing (i) Al2O3 in an amount of 50% or more or containing (i) Al2O3 and (ii) SiO2 in a total amount of 50% or more is formed on a surface of stainless steel having a composition which contains Al: 0.5% or more and/or Si: 0.4% or more and satisfies the following expression (1).;Cr+10Si+Mn+Al>24.5  (1)

主权项

1. A stainless steel substrate for a solar cell having superior insulating properties and a low thermal expansion coefficient, the stainless steel substrate comprising:
stainless steel which contains, by mass %, Cr: 9% to 25%, C: 0.03% or less, Mn: 2% or less, P: 0.05% or less, S: 0.01% or less, N: 0.03% or less, Al: 0.005% to 5.0%, Si: 0.05% to 4.0%, and a remainder including Fe and unavoidable impurities, satisfies one or both of Al content is 0.5% or more and Si content is 0.4% or more, and satisfies the following expression (1); and an oxide film formed on a surface of the stainless steel, the oxide film containing (i) Al2O3 in an amount of 50% or more or containing (i) Al2O3 and (ii) SiO2 in a total amount of 50% or more,
Cr+10Si+Mn+Al>24.5  (1) where a symbol of each element in the expression (1) represents the amount (mass %) of the element in the steel.