US3855015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work roll for hot rolling
Assignee: Hitachi Ltd
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Filing: 1972-05-04
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Granted: 1974-12-17
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Expires: 1992-05-04
Abstract
Abstract A work roll for hot rolling comprising a body portion composed of a steel having a ferrite structure and having a yield strength at least 40 kg/mm2, improvement wherein substantially the whole surface of said body portion in the axial direction is provided with a weld metal having a high smoothed surface and having a thickness of 7 to 50 mm, said weld metal consisting essentially of 0.2 to 0.8 wt% of C, 4 to 10 wt% of Cr, 1 to 4 wt% of Mo, 0.5 to 5 wt% of V, 0.1 to 1.5 wt% of Si, 0.1 to 3 wt% of Mn, up to 0.5 wt% of Ni, up to 0.015 wt% of P, up to 0.015 wt% of S, at least one of 0.01 to 0.5 wt% of Ti and 0.05 to 1 wt% of Al, and the balance of substantially Fe, said components other than Ti and Al showing a hot crack sensitivity value of 2.7 or less when calculated according to the formula,
Inventors
- 👤 T Nemoto
- 👤 K Watanabe
- 👤 K Ono
- 👤 K Sonomoto
- 👤 T Kobayashi
- 👤 J Ishihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:21
CPC Classifications
B; B21; B21B; B21B27/00; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; B23K35/308; B32; B32B; B32B15/00; B32B15/01; B32B15/011; C; C21; C21D; C21D9/00; C21D9/50; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
145 words
A WORK ROLL FOR USE IN HOT ROLLING OF A STEEL COMPRISING A BODY PORTION COMPOSED OF STEEL HAVING A FERRITE STRUCTURE AND HAVING A YIELD STRENGTH OF AT LEAST ABOUT 40KG/MM2, AND A WORKING LAYER OF WELD METAL WELDED BY SUBMERGED ARC WELDING ON THE SURFACE OF SAID BODY PORTION, SAID WORKING LAYER HAVING A SMOOTH SURFACE AND HAVING A THICKNESS OF 7 TO 50 MM, SAID WORKING LAYER CONSISTING ESSENTIALLY OF 0.2 TO 0.8 WT% OF C, 4 TO 10WT% OF CR, 1 TO 4 WT% OF MO, 0.5 TO 5 WT% OF V, 0.1 TO 1.5 WT% OS SI, 0.1 TO 3 WT% OF MN, UP TO 0.5 WT% ON NI, UP TO 0.015WT% OF P, UP TO 0.015WT% OF S, AT LEAST ONE OF 0.01 TO 0.5 WT% OF TI AND 0.05 TO 1 WT% OF AL, AND THE BALANCE OF
Claim 2
Dependent Claim
145 words
A WORK ROLL FOR USE IN HOT ROLLING OF A STEEL COMPRISING A BODY PORTION COMPOSED OF STEEL HAVING A FERRITE STRUCTURE AND HAVING A YIELD STRENGTH OF AT LEAST ABOUT 40KG/MM2, AND A WORKING LAYER OF WELD METAL WELDED BY SUBMERGED ARC WELDING ON THE SURFACE OF SAID BODY PORTION, SAID WORKING LAYER HAVING A SMOOTH SURFACE AND HAVING A THICKNESS OF 7 TO 50 MM, SAID WORKING LAYER CONSISTING ESSENTIALLY OF 0.2 TO 0.8 WT% OF C, 4 TO 10WT% OF CR, 1 TO 4 WT% OF MO, 0.5 TO 5 WT% OF V, 0.1 TO 1.5 WT% OS SI, 0.1 TO 3 WT% OF MN, UP TO 0.5 WT% ON NI, UP TO 0.015WT% OF P, UP TO 0.015WT% OF S, AT LEAST ONE OF 0.01 TO 0.5 WT% OF TI AND 0.05 TO 1 WT% OF AL, AND THE BALANCE OF
Claim 3
Dependent Claim
216 words
A work roll for use in hot rolling of a steel comprising a body portion composed of a steel having a ferrite structure and having a yield strength of at least 40Kg/mm2, and a working layer of weld metal welded by submerged arc welding on the surface of said body portion, said working layer having a smooth surface and having a thickness of 7 to 50 mm, said weld metal consisting essentially of 0.2 to 0.6 wt% of C, 6 to 9 wt% of Cr, 3 to 4 wt% of Mo, 0.8 to 1.3 wt% of V, 0.1 to 1.5 wt% of Si, 1 to 2 wt% of Mn, at least one of 0.01 to 0.3 wt% of Ti and 0.2 to 0.5 wt% of Al, up to 0.5 wt% of Ni, up to 0.015 wt% of P, up to 0.015 wt% of S and the balance of substantially Fe, said components other than Ti and Al showing a hot crack sensitivity value of 2.7 or less when calculated according to the formula, C(P+S+Si/25+Ni/30)/3Mn+ Cr+Mo+V X 103 said working layer having a structure comprising carbide particles distributed in a martensite matrix produced by maintaining said working layer at a temperature at which it is capable of forming an austenite structure and thereafter cooling said working layer.
Claim 4
Dependent Claim
216 words
A work roll for use in hot rolling of a steel comprising a body portion composed of a steel having a ferrite structure and having a yield strength of at least 40Kg/mm2, and a working layer of weld metal welded by submerged arc welding on the surface of said body portion, said working layer having a smooth surface and having a thickness of 7 to 50 mm, said weld metal consisting essentially of 0.2 to 0.6 wt% of C, 6 to 9 wt% of Cr, 3 to 4 wt% of Mo, 0.8 to 1.3 wt% of V, 0.1 to 1.5 wt% of Si, 1 to 2 wt% of Mn, at least one of 0.01 to 0.3 wt% of Ti and 0.2 to 0.5 wt% of Al, up to 0.5 wt% of Ni, up to 0.015 wt% of P, up to 0.015 wt% of S and the balance of substantially Fe, said components other than Ti and Al showing a hot crack sensitivity value of 2.7 or less when calculated according to the formula, C(P+S+Si/25+Ni/30)/3Mn+ Cr+Mo+V X 103 said working layer having a structure comprising carbide particles distributed in a martensite matrix produced by maintaining said working layer at a temperature at which it is capable of forming an austenite structure and thereafter cooling said working layer.
Claim 5
Dependent Claim
211 words
A work roll for use in hot rolling of a steel comprising a body portion composed of a steel having a ferrite structure and having a yield strength of at least 40 Kg/mm2, and a working layer of weld metal welded by submerged arc welding on the surface of said body portion, said working layer having a smooth surface and having a thickness of 7 to 50 mm, said weld metal consisting essentially of 0.2 to 0.6 wt% of C, 6 to 9 wt% of Cr, 3 to 4 wt% of Mo, 0.8 to 1.3 wt% of V, 0.1 to 1.5 wt% of Si, 1 to 2 wt% of Mn, at least one of 0.01 to 0.3 wt% of Ti and 0.2 to 0.5 wt% of Al, up to 0.015 wt% of P, up to 0.015 wt% of S and the balance of substantially Fe, said components other than Ti and Al showing a hot crack sensitivity value of 2.7 or less when calculated according to the formula C(P+S+Si/25)/3Mn+Cr+Mo+V X 103 and said working layer having a structure comprising carbide particles distributed in a martensite matrix produced by maintaining said working layer at a temperature at which it is capable of forming an austenite structure and thereafter cooling said working layer.
Claim 6
Dependent Claim
211 words
A work roll for use in hot rolling of a steel comprising a body portion composed of a steel having a ferrite structure and having a yield strength of at least 40 Kg/mm2, and a working layer of weld metal welded by submerged arc welding on the surface of said body portion, said working layer having a smooth surface and having a thickness of 7 to 50 mm, said weld metal consisting essentially of 0.2 to 0.6 wt% of C, 6 to 9 wt% of Cr, 3 to 4 wt% of Mo, 0.8 to 1.3 wt% of V, 0.1 to 1.5 wt% of Si, 1 to 2 wt% of Mn, at least one of 0.01 to 0.3 wt% of Ti and 0.2 to 0.5 wt% of Al, up to 0.015 wt% of P, up to 0.015 wt% of S and the balance of substantially Fe, said components other than Ti and Al showing a hot crack sensitivity value of 2.7 or less when calculated according to the formula C(P+S+Si/25)/3Mn+Cr+Mo+V X 103 and said working layer having a structure comprising carbide particles distributed in a martensite matrix produced by maintaining said working layer at a temperature at which it is capable of forming an austenite structure and thereafter cooling said working layer.
Claim 7
Dependent Claim
198 words
A work roll for use in hot rolling of a steel comprising a body portion composed of a steel having a ferrite structure and having a yield strength at least 40 Kg/mm2, and a working layer of weld metal welded by submerged arc welding on the surface of said body portion, said working layer having a high smoothed surface and having a thickness of 7 to 50 mm, said weld metal consisting essentially of 0.2 to 0.6 wt% of C, 6 to 9 wt% of Cr, 3 to 4 wt% of Mo, 0.8 to 1.3 wt% of V, 0.1 to 1.5 wt% of Si, 1 to 2 wt% of Mn, 0.01 to 0.3 wt% of Ti, up to 0.015 wt% of P, up to 0.015 wt% of S and the balance of substantially Fe, said components other than Ti showing a hot crack sensitivity value of 2.6 or less when calculated according to the formula, C(P+S+Si/25)/3Mn+Cr+Mo+V X 103 and said working layer having a structure comprising carbide particles distributed in a martensite matrix produced by maintinaing said working layer at a temperature at which it is capable of forming an austenite structure and thereafter cooling said working layer.
Claim 8
Dependent Claim
198 words
A work roll for use in hot rolling of a steel comprising a body portion composed of a steel having a ferrite structure and having a yield strength at least 40 Kg/mm2, and a working layer of weld metal welded by submerged arc welding on the surface of said body portion, said working layer having a high smoothed surface and having a thickness of 7 to 50 mm, said weld metal consisting essentially of 0.2 to 0.6 wt% of C, 6 to 9 wt% of Cr, 3 to 4 wt% of Mo, 0.8 to 1.3 wt% of V, 0.1 to 1.5 wt% of Si, 1 to 2 wt% of Mn, 0.01 to 0.3 wt% of Ti, up to 0.015 wt% of P, up to 0.015 wt% of S and the balance of substantially Fe, said components other than Ti showing a hot crack sensitivity value of 2.6 or less when calculated according to the formula, C(P+S+Si/25)/3Mn+Cr+Mo+V X 103 and said working layer having a structure comprising carbide particles distributed in a martensite matrix produced by maintinaing said working layer at a temperature at which it is capable of forming an austenite structure and thereafter cooling said working layer.
Claim 9
Dependent Claim
283 words
A work roll for hot rolling a cast structure of a metal or alloy in which the cast structure is heated to above its recrystallization temperature to increase its plasticity and the cast structure is passed between said work roll and a back-up roll in order to shape said cast structure into plates, rods or other structural shapes, said work roll comprising: a body portion composed of a mild steel or a steel having about 0.24 wt% C, the steel of said body portion having a ferritic structure and having a yield strength of at least 40 Kg/mm2; and a working layer of a weld metal welded by submerged arc welding on the surface of said body portion, said working layer havinG a smooth surface and having a thickness of 7 to 50 mm, said working layer consisting essentially of 0.2 to 0.8 wt% of C, 4 to 10 wt% of Cr, 1 to 4 wt% of Mo, 0.8 to 1.3 wt% of V, 0.1 to 1.5 wt% of Si, 1 to 2 wt% of Mn, at least one of 0.01 to 1.3 wt% of Ti and 0.2 to 0.5 wt% of Al, up to 0.5 wt% of Ni, up to 0.015 wt% of P, up to 0.015 wt% of S and the balance of substantially Fe, said components other than Ti and Al showing a hot crack sensitivity value of 2.7 or less when calculated according to the formula, C(P+S+Si/25+Ni/30)/3Mn+Cr+Mo+V X 103 and said working layer having a structure comprising carbide particles distributed in a martensite matrix produced by maintaining said working layer at a temperature at which it is capable of forming an austenite structure and thereafter cooling said working layer.
Claim 10
Dependent Claim
283 words
A work roll for hot rolling a cast structure of a metal or alloy in which the cast structure is heated to above its recrystallization temperature to increase its plasticity and the cast structure is passed between said work roll and a back-up roll in order to shape said cast structure into plates, rods or other structural shapes, said work roll comprising: a body portion composed of a mild steel or a steel having about 0.24 wt% C, the steel of said body portion having a ferritic structure and having a yield strength of at least 40 Kg/mm2; and a working layer of a weld metal welded by submerged arc welding on the surface of said body portion, said working layer havinG a smooth surface and having a thickness of 7 to 50 mm, said working layer consisting essentially of 0.2 to 0.8 wt% of C, 4 to 10 wt% of Cr, 1 to 4 wt% of Mo, 0.8 to 1.3 wt% of V, 0.1 to 1.5 wt% of Si, 1 to 2 wt% of Mn, at least one of 0.01 to 1.3 wt% of Ti and 0.2 to 0.5 wt% of Al, up to 0.5 wt% of Ni, up to 0.015 wt% of P, up to 0.015 wt% of S and the balance of substantially Fe, said components other than Ti and Al showing a hot crack sensitivity value of 2.7 or less when calculated according to the formula, C(P+S+Si/25+Ni/30)/3Mn+Cr+Mo+V X 103 and said working layer having a structure comprising carbide particles distributed in a martensite matrix produced by maintaining said working layer at a temperature at which it is capable of forming an austenite structure and thereafter cooling said working layer.
Claim 11
Dependent Claim
17 words
A work roll according to claim 5, wherein said body portion is composed of a mild steel.
Claim 12
Dependent Claim
43 words
A work roll according to claim 5, wherein said body portion is composed of a steel consisting essentially of about 0.24 wt% C, about 0.32 wt% Si, about 0.78 wt% Mn, about 0.024 wt% P, about 0.02 wt% S and the balance Fe.
Claim 13
Dependent Claim
31 words
A work roll according to claim 5, wherein the structure of said working layer is produced by heating said weld metal to a temperature of about 720* C and thereafter cooling.
Claim 14
Dependent Claim
26 words
The work roll of claim 8, wherein said weld metal is maintained at a temperature of about 720* C for about 2 hours before being cooled.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |