Enameling Steel

Enameling Steel

From household appliances, barbeque grills, cookware, signs/panels and heat exchangers to automotive parts and fireplace components, Mapes & Sprowl Steel stands ready to meet your specific enameling steel needs. Our offerings resist fishscaling and carbon boil during the enameling process, providing the sag resistance needed during the firing process. With this in mind, the results are quality end products run after run. Contact us today for a quote on your project.

ASTM A424 Type I

This product has an extremely low-carbon level achieved through sheet decarburization. The production of this steel aims to be free from carbon boiling and enamel fishscale in a direct-on cover coat porcelain enamel system. The product is also great for ground coat enameling systems and is especially good for dry powder enamels. ASTM A424 Type I Enameling Steel has somewhat inferior sag resistance to Type III but has superior sag resistance to Type II.

ASTM A424 Type II

This product is well suited for ground coat, ground coat + cover coat, and some two coat-one fire porcelain enameling applications. We do not recommend this material for direct-on cover coat applications because it contains carbon. Yield strength retention after strain-and-fire is superior to Type-I products and, in some cases, superior to Type III products. Of the specialty enameling steel products, this product offers the least sag resistance of the three. Porcelain enamel fishscale is not a problem with this product.

ASTM A424 Type III

This is an interstitial-free steel suitable for applications partaking in ground and cover coat enameling operations.  When switching to a T-III, we recommend informing your frit supplier as minor porcelain enamel formulation changes are essential depending on your particular enamel system. Type III enameling steel has superior formability to Type I and to Type II products because of its inherently high R-value. Yield strength after firing is, typically, superior to Type I, but not as good as Type II. Sag resistance for this product is superior to both Type I and Type II.

GRADE YS (ksi.) YS (MPa) UTS (ksi) UTS (MPa) ELONG. % N Rm
TYPE I 25 165 43 165 44 0.22 < 1.3
TYPE II 26 180 44 300 42 0.22 < 1.3
TYPE III 20 140 44 300 46 0.24 1.7
GRADE C Mn P S Si Cu Al Ti
TYPE I 0.003 0.21 0.01 0.01 0.01 0.02 0.05
TYPE II 0.04 0.21 0.01 0.01 0.01 0.02 0.05
TYPE III 0.005 0.20 0.01
0.01 0.01 0.02 0.05 0.13
Young’s Modulus of Elasticity
200 x 10E3 MPa at 20 °C
7.87 g/cm3 at 20 °C
Coefficient of Thermal Expansion TYPE I: 11.9 μm/m/°C in 20 – 100 °C range
TYPE II: 12.4 μm/m/°C in 20 – 100 °C range
TYPE III: 12.9 μm/m/°C in 20 – 100 °C range
Thermal Conductivity TYPE I: 90 W/m°C at 20 °C
TYPE II: 89 W/m°C at 20 °C
TYPE III: 93 W/m°C at 20 °C
Specific Heat 481 J/kg/°C in 50 – 100 °C range
Electrical Resistivity 0.142 μΩ•m at 20 °C