Enamelware and glaze
View Patent ↗The present invention provides enamelware and a glaze improving the bondability between the steel substrate and enamel layer and superior in resistance to dew point corrosion by sulfuric acid and hydrochloric acid, that is, a steel substrate of a composition containing, by mass %, Cu: 0.05 to 0.5%, Si: 0.1 to 2.0%, Mn: 0.05 to 2.0%, P: 0.005 to 0.10%, and S: 0.005 to 0.1%, restricting C to C: 0.20% or less, and comprising a balance of Fe and unavoidable impurities on the surface of which an enamel layer of a thickness of 50 to 700 μm is provided. At that time, the content of Co oxides in the enamel layer is made, converted to Co, 0.01 to 10% and/or the content of Ni oxides is made, converted to Ni, 0.05 to 20% or the total content of Ni in the steel substrate and enamel layer is made 0.005 to 4.5% with respect to the total mass of the enamelware and/or the total content of Co is made 0.008 to 4.0% with respect to the total mass of the enamelware.
1. Enamelware comprised of a steel substrate on the surface of which an enamel layer is provided, wherein said steel substrate contains,
by mass %,
Cu: 0.05 to 0.37%,
Si: 0.1 to 2.0%,
Mn: 1.2 to 2.0%,
Mo: 0.003 to 0.034
P: 0.005 to 0.10%,
S: 0.005 to 0.1%,
C: 0.20% or less,
Sb: 0.080 to 0.8%,
Ni: 0.005 to 4.5%, and
Co: 0.008 to 4.0%;
optionally one or more elements selected from the group consisting of:
Sn: 0.005 to 0.3%,
Cr: 0.005 to 2.0%
Ti: 0.01 to 2.0%,
Nb: 0.01 to 2.0%,
V: 0.01 to 2.0%,
Zr: 0.01 to 2.0%,
B: 0.001 to 1.0%
Ca: 0.005 to 2.0%,
Rem: 0.005 to 2.0%,
Mg: 0.005 to 1.0%,
O: 0.01 to 0.30%,
Al: 0.005 to 0.10% and
a balance of Fe and unavoidable impurities,
wherein said enamel layer has a thickness of 50 to 700 μm, and contains at least one element selected from the group consisting of, in total content per total mass, Ni: 0.005 to 4.5% and Co: 0.008 to 4.0%.
2. Enamelware as set forth in claim 1 , characterized in that said steel substrate and said enamel layer have a plating layer comprised of Ni, an Ni alloy, Co, a Co alloy, Zn, a Zn alloy, Al, an Al alloy, Sn, or a Sn alloy having a thickness of 1 to 500 μm provided between them.
3. Enamelware as set forth in claim 1 , characterized in that said steel substrate contains, by mass %, Ni: 0.30 to 4.5%.
4. A method of producing an enamelware superior in resistance to dew point corrosion by sulfuric acid and hydrochloric acid comprising:
forming a steel substrate as set forth in claim 1 onto a surface of which an enamel layer is provided, wherein said enamel layer has a thickness of 50 to 700 μm, and contains at least one element selected from the group consisting of, in total content per total mass, Ni: 0.005 to 4.5% and Co: 0.008 to 4.0%.