The provisions of this subpart are applicable to discharges and to the introduction of pollutants into publicly owned treatment works resulting from oxidizing and reducing salt bath descaling operations.

(a) The term salt bath descaling, oxidizing means the removal of scale from semi-finished steel products by the action of molten salt baths other than those containing sodium hydride.

(b) The term salt bath descaling, reducing means the removal of scale from semi-finished steel products by the action of molten salt baths containing sodium hydride.

(c) The term batch, sheet and plate means those descaling operations that remove surface scale from sheet and plate products in batch processes.

(d) The term batch, rod and wire means those descaling operations that remove surface scale from rod and wire products in batch processes.

(e) The term batch, pipe and tube means those descaling operations that remove surface scale from pipe and tube products in batch processes.

(f) The term continuous means those descaling operations that remove surface scale from the sheet or wire products in continuous processes.

(g) The term batch means those descaling operations in which the products are processed in discrete batches.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

(a) Salt bath descaling, oxidizing—(1) Batch, sheet and plate.

(2) Batch, rod and wire.

(3) Batch, pipe and tube.

(4) Continuous.

(b) Salt bath descaling, reducing—(1) Batch.

(2) Continuous.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

(a) Salt bath descaling, oxidizing—(1) Batch, sheet and plate.

(2) Batch, rod and wire.

(3) Batch, pipe and tube.

(4) Continuous.

(b) Salt bath descaling, reducing—(1) Batch.

(2) Continuous.

The discharge of wastewater pollutants from any new source subject to this subpart shall not exceed the standards set forth below.

(a) Salt bath descaling, oxidizing—(1) Batch, sheet and plate.

(2) Batch, rod and wire.

(3) Batch, pipe and tube.

(4) Continuous.

(b) Salt bath descaling, reducing—(1) Batch.

(2) Continuous.

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources.

(a) Salt bath descaling, oxidizing—(1) Batch, sheet and plate.

(2) Batch, rod and wire.

(3) Batch, pipe and tube.

(4) Continuous.

(b) Salt bath descaling, reducing—(1) Batch.

(2) Continuous.

Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources.

(a) Salt bath descaling, oxidizing—(1) Batch, sheet and plate.

(2) Batch, rod and wire.

(3) Batch, pipe and tube.

(4) Continuous.

(b) Salt bath descaling, reducing—(1) Batch.

(2) Continuous.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology.

(a) Salt bath descaling, oxidizing—(1) Batch, sheet and plate.

(2) Batch, rod and wire.

(3) Batch, pipe and tube.

(4) Continuous.

(b) Salt bath descaling, reducing—(1) Batch.

(2) Continuous.