Antioxidant agent and process for producing metallic material
There is provided an antioxidant agent capable of preventing scale from being produced on the surface of a heated metallic starting material more effectively than the conventional antioxidant agent. The antioxidant agent according to the present invention contains a plurality of glass frits having different softening points and an inorganic compound having a melting point not higher than 600° C. The inorganic compound mainly softens in the low-temperature range of about 600° C. The plurality of glass frits mainly soften in the low-temperature range of about 600 to 1300° C. Therefore, the antioxidant agent covers the surface of metallic starting material in a broad temperature range, oxidizes the surface of metallic starting material, and prevents the production of scale.
1. An antioxidant agent to be applied to the surface of a metallic starting material, containing:
first glass frits having a viscosity of 2×10 2 to 10 6 dPa·s at 1200° C.; and
second glass frits having a viscosity of 2×10 2 to 10 6 dPa·s at 700° C.; and
an inorganic compound having a melting point not higher than 600° C.
2. The antioxidant agent according to claim 1 , wherein
the inorganic compound is at least one of an inorganic salt and an oxide, each having a melting point of 400 to 600° C.
3. The antioxidant agent according to claim 1 , wherein
the inorganic compound is at least one of boric acid and boron oxide.
4. The antioxidant agent according to claim 2 , wherein
the inorganic compound is at least one of boric acid and boron oxide.
5. The antioxidant agent according to claim 1 , wherein
the antioxidant agent contains 4 to 20 weight parts of the second glass frits and 4 to 20 weight parts of the inorganic compound with respect to 100 weight parts of the first glass frits.
6. The antioxidant agent according to claim 2 , wherein
the antioxidant agent contains 4 to 20 weight parts of the second glass frits and 4 to 20 weight parts of the inorganic compound with respect to 100 weight parts of the first glass frits.
7. The antioxidant agent according to claim 3 , wherein
the antioxidant agent contains 4 to 20 weight parts of the second glass frits and 4 to 20 weight parts of the inorganic compound with respect to 100 weight parts of the first glass frits.
8. The antioxidant agent according to claim 4 , wherein
the antioxidant agent contains 4 to 20 weight parts of the second glass frits and 4 to 20 weight parts of the inorganic compound with respect to 100 weight parts of the first glass frits.
9. The antioxidant agent according to claim 1 , wherein
the antioxidant agent further contains an alkali metal salt.
10. The antioxidant agent according to claim 1 , wherein
the antioxidant agent further contains an insoluble group 2 metal salt.
11. The antioxidant agent according to claim 10 , wherein
the insoluble group 2 metal salt is at least one of magnesium carbonate and calcium carbonate.
12. The antioxidant agent according to claim 1 , wherein
the antioxidant agent further contains a suspending agent.
13. A process for producing a metallic material, comprising the steps of:
applying the antioxidant agent according to claim 1 to the surface of a metallic starting material; and
heating the metallic starting material to which the antioxidant agent has been applied.