CA2239440A1 - Grinding rod chemistry and method of heat treatment to enhance wearability - Google Patents

Grinding rod chemistry and method of heat treatment to enhance wearability Download PDF

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Publication number
CA2239440A1
CA2239440A1 CA 2239440 CA2239440A CA2239440A1 CA 2239440 A1 CA2239440 A1 CA 2239440A1 CA 2239440 CA2239440 CA 2239440 CA 2239440 A CA2239440 A CA 2239440A CA 2239440 A1 CA2239440 A1 CA 2239440A1
Authority
CA
Canada
Prior art keywords
bar
rockwell
vessel
hardness
grinding rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2239440
Other languages
French (fr)
Other versions
CA2239440C (en
Inventor
Robert William Pugh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ALTASTEEL Ltd
Original Assignee
Stelco Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stelco Inc filed Critical Stelco Inc
Priority to CA 2239440 priority Critical patent/CA2239440C/en
Publication of CA2239440A1 publication Critical patent/CA2239440A1/en
Application granted granted Critical
Publication of CA2239440C publication Critical patent/CA2239440C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/20—Disintegrating members
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/36—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for balls; for rollers
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2221/00—Treating localised areas of an article
    • C21D2221/01—End parts (e.g. leading, trailing end)
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2221/00—Treating localised areas of an article
    • C21D2221/10—Differential treatment of inner with respect to outer regions, e.g. core and periphery, respectively

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

A grinding rod chemistry enhances wearability and durability of a steel rod and comprises levels of carbon to achieve a surface hardness in excess of 55 Rockwell C and levels of chromium which achieve significant depth in the formed outer martensite shell. The grinding rod has a core greater than 99% pearlite with a hardness less than 45 Rockwell C and the end portions of the rod are soft and have a hardness less than 35 Rockwell C. The steel bar of the selected chemistry is treated by reheating to above its austenitising temperature, transferring with minimal cooling to an open tubular quench vessel while securing the bar in the vessel to minimize bar warping, introducing quench water into the inlet end of the vessel and passing the liquid through the vessel to ensure uniform heat removal. The outer martensite shell is tempered by allowing the bar to soak back after quenching. The bar end portions are reheated in a furnace to elevate the end portions above the austenitising temperature and air cooling each end portion to provide the engineered end portion hardness of less than 35 Rockwell C.
CA 2239440 1998-06-02 1998-06-02 Grinding rod chemistry and method of heat treatment to enhance wearability Expired - Lifetime CA2239440C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2239440 CA2239440C (en) 1998-06-02 1998-06-02 Grinding rod chemistry and method of heat treatment to enhance wearability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2239440 CA2239440C (en) 1998-06-02 1998-06-02 Grinding rod chemistry and method of heat treatment to enhance wearability

Publications (2)

Publication Number Publication Date
CA2239440A1 true CA2239440A1 (en) 1999-12-02
CA2239440C CA2239440C (en) 2007-11-13

Family

ID=29275823

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2239440 Expired - Lifetime CA2239440C (en) 1998-06-02 1998-06-02 Grinding rod chemistry and method of heat treatment to enhance wearability

Country Status (1)

Country Link
CA (1) CA2239440C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106423471A (en) * 2016-09-14 2017-02-22 陕西达能新型材料有限公司 Circulating water cooling system for lowering temperature of pulverizing area of refined cotton pulverizer
CN114908238A (en) * 2022-05-31 2022-08-16 中冶华天工程技术有限公司 Intelligent waste heat online heat treatment method for special steel bar
CN115141919A (en) * 2022-05-31 2022-10-04 中冶华天工程技术有限公司 Green excellent rod on-line heat treatment method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106423471A (en) * 2016-09-14 2017-02-22 陕西达能新型材料有限公司 Circulating water cooling system for lowering temperature of pulverizing area of refined cotton pulverizer
CN106423471B (en) * 2016-09-14 2019-06-14 陕西达能新型材料有限公司 A kind of circulating water cooling system reducing purified cotton grinder disintegrating area temperature
CN114908238A (en) * 2022-05-31 2022-08-16 中冶华天工程技术有限公司 Intelligent waste heat online heat treatment method for special steel bar
CN115141919A (en) * 2022-05-31 2022-10-04 中冶华天工程技术有限公司 Green excellent rod on-line heat treatment method
CN115141919B (en) * 2022-05-31 2023-12-15 中冶华天工程技术有限公司 Online heat treatment method for green excellent rod

Also Published As

Publication number Publication date
CA2239440C (en) 2007-11-13

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Effective date: 20180604