Part 420 - IRON AND STEEL MANUFACTURING POINT SOURCE CATEGORY
- Subpart A - COKEMAKING SUBCATEGORY (§§ 420.10 — 420.18)
- Subpart B - SINTERING SUBCATEGORY (§§ 420.20 — 420.29)
- Subpart C - IRONMAKING SUBCATEGORY (§§ 420.30 — 420.37)
- Subpart D - STEELMAKING SUBCATEGORY (§§ 420.40 — 420.48)
- Subpart E - VACUUM DEGASSING SUBCATEGORY (§§ 420.50 — 420.57)
- Subpart F - CONTINUOUS CASTING SUBCATEGORY (§§ 420.60 — 420.67)
- Subpart G - HOT FORMING SUBCATEGORY (§§ 420.70 — 420.77)
- Subpart H - SALT BATH DESCALING SUBCATEGORY (§§ 420.80 — 420.87)
- Subpart I - ACID PICKLING SUBCATEGORY (§§ 420.90 — 420.97)
- Subpart J - COLD FORMING SUBCATEGORY (§§ 420.100 — 420.107)
- Subpart K - ALKALINE CLEANING SUBCATEGORY (§§ 420.110 — 420.117)
- Subpart L - HOT COATING SUBCATEGORY (§§ 420.120 — 420.127)
- Subpart M - OTHER OPERATIONS SUBCATEGORY (§§ 420.130 — 420.137)
- GENERAL PROVISIONS (§§ 420.01 — 420.08)