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C21D 8/00

Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02)

Introduced: January 1980

Title

Titles differ between systems:

IPC: Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment

CPC: Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02)

Full Title

Full titles differ between systems:

IPC:

Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment

CPC:

Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02)

Additional Content IPC

Glossary

deep-drawing metal forming process to create a three-dimensional, hollow or contoured shape with no thickness reduction intended and wherein depth of the drawn part is greater than the diameter of the part (usually for cylindrical shapes) drawing metal forming process to create a three-dimensional, hollow or contoured shape with no thickness reduction intended and covering any depth in relation to the other dimension of a component hot rolling rolling in the recrystallisation temperature range with no strain hardening (above approximately 800ºC) warm rolling rolling in the austenitic-ferritic temperature range, or also below with little recrystallisation and reduced strain hardening rate (approximately 200ºC to 800ºC) cold rolling rolling in the non-recrystallisation temperature range, close to room temperature with full strain hardening (below approximately 200°C)

Limiting references

Hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

Child Classifications

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  • C21D 8/10 during manufacturing of tubular bodies since 1980 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class C21,2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL JP 7,470
  2. POSCO (POHANG IRON AND STEEL COMPANY) KR 4,615
  3. JFE STEEL 4,538
  4. NIPPON STEEL CORPORATION JP 4,536
  5. ARCELORMITTAL LU 2,597
  6. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,241
  7. ANGANG STEEL COMPANY 2,126
  8. NSSMC (NIPPON STEEL & SUMITOMO METAL) 1,783
  9. BAOSHAN IRON & STEEL COMPANY 1,620
  10. HYUNDAI STEEL COMPANY KR 1,545

Top Applicants (CPC)

Class C21,2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL JP 8,270
  2. NIPPON STEEL CORPORATION JP 5,222
  3. POSCO (POHANG IRON AND STEEL COMPANY) KR 4,824
  4. JFE STEEL 3,311
  5. ARCELORMITTAL LU 3,239
  6. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,659
  7. HYUNDAI STEEL COMPANY KR 1,492
  8. ANGANG STEEL COMPANY 1,318
  9. BAOSHAN IRON & STEEL COMPANY 1,233
  10. KOBE STEEL JP 1,228