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1. WO1991000371 - STEEL COMPOSITION FOR A COMPOSITE ROLL AND HEAT TREATMENT THEREOF

Publication Number WO/1991/000371
Publication Date 10.01.1991
International Application No. PCT/AU1990/000282
International Filing Date 02.07.1990
Chapter 2 Demand Filed 29.01.1991
IPC
B21B 27/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
BROLLING OF METAL
27Rolls; Lubricating, cooling or heating rolls while in use
B32B 15/01 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
32LAYERED PRODUCTS
BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
15Layered products essentially comprising metal
01all layers being exclusively metallic
C22C 38/38 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
38with more than 1.5% by weight of manganese
CPC
B21B 27/00
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
BROLLING OF METAL
27Rolls, ; roll alloys or roll fabrication
B32B 15/011
BPERFORMING OPERATIONS; TRANSPORTING
32LAYERED PRODUCTS
BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
15Layered products comprising ; a layer of; metal
01all layers being exclusively metallic
011all layers being formed of iron alloys or steels
C22C 38/38
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
38with more than 1.5% by weight of manganese
Y10T 428/12965
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
428Stock material or miscellaneous articles
12All metal or with adjacent metals
12493Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
12771Transition metal-base component
12861Group VIII or IB metal-base component
12951Fe-base component
12958Next to Fe-base component
12965Both containing 0.01-1.7% carbon [i.e., steel]
Y10T 428/12979
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
428Stock material or miscellaneous articles
12All metal or with adjacent metals
12493Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
12771Transition metal-base component
12861Group VIII or IB metal-base component
12951Fe-base component
12972Containing 0.01-1.7% carbon [i.e., steel]
12979Containing more than 10% nonferrous elements [e.g., high alloy, stainless]
Applicants
  • THE BROKEN HILL PROPRIETARY COMPANY LIMITED [AU/AU]; 140 William Street Melbourne, VIC 3000, AU (AllExceptUS)
  • SAXBY, Peter, Robert [AU/AU]; AU (UsOnly)
Inventors
  • SAXBY, Peter, Robert; AU
Agents
  • MUNT, Gregory, Richard; Griffith Hack & Co. 601 St. Kilda Road Melbourne, VIC 3004, AU
Priority Data
PJ 502430.06.1989AU
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) STEEL COMPOSITION FOR A COMPOSITE ROLL AND HEAT TREATMENT THEREOF
(FR) COMPOSITION A BASE D'ACIER POUR LA FABRICATION D'UN CYLINDRE COMPOSITE ET TRAITEMENT THERMIQUE D'UN TEL CYLINDRE
Abstract
(EN)
A steel composition comprising in wt% C: 0.35 to 1.2, Mn: 0.3 to 3.0, Si: 0.3 to 2.0, Cr: 5.0 to 11.5, Mo: 0.3 to 5.0, Nb: 0.4 to 5.0, V: 0.3 to 3.0, balance iron and incidental impurities. Composite roll formed by welding the steel composition onto a metal core to form a hardface. Optionally heat treating the composite roll (a) stress relieving stage (i) heating the composite roll at a rate of 40°C to 100°C/hour from the welding temperature to within a range of temperatures at which the microstructure of the hardface can stress relieve; (ii) holding the composite roll within the range of temperatures for a sufficient time to allow the microstructure to partially stress relieve; and (iii) air cooling the composite roll to room temperature to partially transform the austenite phase to the martensite phase; (b) first tempering stage (i) heating the composite roll at a rate of 40°C to 100°C/hour to within a range of temperatures to allow the microstructure to temper; (ii) holding the composite roll within the range of temperatures for a sufficient time to allow partial tempering; and (iii) air cooling the composite roll to room temperature; (c) second tempering stage, repeating the first tempering stage.
(FR)
La composition à base d'acier décrite comprend: 0,5 à 1,2 % en poids de C; 0,3 à 3,0 % en poids de Mn; 0,3 à 2,0 % en poids de Si; 5,0 à 11,5 % en poids de Cr; 0,3 à 5,0 % en poids de Mo; 0,4 à 5,0 % en poids de Nb; et 0,3 à 3,0 % en poids de V; le reste étant constitué par du fer et des impuretés accidentelles. Le cylindre composite décrit est formé par soudage de la composition à base d'acier sur un noyau métallique pour produire une couche de rechargement dur. Le cylindre composite peut être soumis à un traitement thermique optionnel, qui comporte: (a) une étape de relaxation des contraintes consistant: (i) à chauffer le cylindre composite à une cadence de 40°C à 100°C/heure en partant de la température de soudage jusqu'à atteindre des températures comprises dans une plage de températures auxquelles la microstructure de la couche de rechargement dur peut subir une relaxation des contraintes; (ii) à maintenir le cylindre composite dans cette plage de températures pendant une période suffisante pour permettre à la microstructure de subir une relaxation partielle des contraintes; et (iii) à refroidir par air le cylindre composite à température ambiante pour transformer partiellement la phase austénitique en phase martensitique; (b) une première étape de trempe consistant: (i) à chauffer le cylindre composite à une cadence de 40°C à 100°C/heure jusqu'à atteindre des températures comprises dans une plage de températures auxquelles la microstructure subit la trempe; (ii) à maintenir le cylindre composite dans cette plage de températures pendant une période suffisante pour permettre sa trempe partielle; et (iii) à refroidir par air le cylindre composite à température ambiante; (c) ainsi qu'une seconde étape de trempe consistant à répéter la première étape de trempe.
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