US3649370A - Process for improving the wear resistance of steel shot - Google Patents

Process for improving the wear resistance of steel shot Download PDF

Info

Publication number
US3649370A
US3649370A US842876A US3649370DA US3649370A US 3649370 A US3649370 A US 3649370A US 842876 A US842876 A US 842876A US 3649370D A US3649370D A US 3649370DA US 3649370 A US3649370 A US 3649370A
Authority
US
United States
Prior art keywords
weight percent
steel
wear resistance
steel shot
shot
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.)
Expired - Lifetime
Application number
US842876A
Other languages
English (en)
Inventor
Dr Friedrich W Dorn
Dr Klaus Frank
Dr Dietrich Gleisberg
Dr Joachim Kandler
Hans D Thiel
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.)
Knapsack AG
Original Assignee
Knapsack AG
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 Knapsack AG filed Critical Knapsack AG
Application granted granted Critical
Publication of US3649370A publication Critical patent/US3649370A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B22F1/142—Thermal or thermo-mechanical treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts

Definitions

  • the improved steel shot is produced by heating it for a period of between about 1 and 5 hours to temperatures between 200 and 500 C.
  • German published specification 1,254,366 describes silicon-containing steel alloys formed of shot particles, which are characterized by solidity, freedom from strains, smoothness, roundness and freedom from superficial cracks, contain between 0.05 and 1.7% carbon, between 1.1 and 8% silicon, optionally between 0.1 and 2.0% manganese, between 0 and 5% chromium, between 0 and 5% nickel, between 0 and 5% copper and between 0 and 5% aluminum, the balance being iron, and are used as blasting agents in the treatment of metal, stone or glass surfaces.
  • the present process for improving the wear resistance of steel shot which is (a) suitable for use as a blasting agent in the treatment of metal, stone, ceramic or glass surfaces, (b) formed of particles characterized by inner solidity, freedom from strains, smoothness, roundness and freedom from superficial cracks, and a size between 0.01 and 3.0 mm., and (c) contain between 1.1 and 3.3 weight percent silicon, between 0.05 and 0.4 weight percent carbon, between 0.1 and 0.8 weight percent maganese, between 0 and 1.0 weight percent of one or more customary steel-accompanying metals, such as chromium, nickel, copper, titanium, aluminum, molybdenum or tungsten, the balance being iron, comprises more especially heating the steel shot for a period of between about 1 and 5 hours, preferably between about 1.5 and 2.5 hours, to temperatures between 200 and 500 C., preferably between 250 and 400 C.
  • the steel shot particles of which the wear resistance shall be improved are produced as usual, preferably however by subjecting a steel melt having a temperature between 1500 and 1800" C. and prepared, for example, by electrothermal means, to atomization or nozzle-spraying using water, steam, air or nitrogen under a pressure of between 1 and 13 atmospheres gauge, or by causing a stream of the steel melt having a temperature of between 1500 and 1800 C. to arrive on a granulating plate, cone or groove, and forthwith quenching the molten particles with an excess of water.
  • the steel melt can be prepared in an electric furnace, an arc furnace or induction furnace using, for example, scrap and the desirable alloy addends as the starting material.
  • the steel melt should conveniently contain between 1.1 and 3.3% silicon, between 0.05 and 0.4% carbon, between 0.1 and 0.8% manganese, and optionally up to 1% of one or more customary steel-accompanying metals, such as chromium, nickel, copper, titanium, aluminum, molybdenum or tungsten, which may also derive from the scrap.
  • a steel me-lt so composed has a melting point higher than 1493 C. To ensure uniform distribution of all of the components, it is necessary for the melt to be heated to a temperature at least C. higher than its respective melting point.
  • FIGS. 1 and 2 illustrate the influence of the annealing temperature and period on the wear resistance of the steel shot produced in Examples 1 and 2 hereinafter.
  • EXAMPLE 1 A basic-lined arc furnace was used to melt therein 390 kg. scrap iron (0.2% Si; 0.15% C; 0.4% Mn) and kg. return material (2.2% Si; 0.20% C) under a covering slag with a CaO/SiO -ratio larger than 1.5, which were subsequently alloyed with 46 kg. ferrosilicon 45 (44.8% Si).
  • the resulting melt which had a temperature of 1750 C., was deoxidized using 0.5 kg. aluminum, just prior to atomizing it.
  • the melt was delivered through a pouring gate with an opening 13 mm. wide so as to centrally arrive in a spray nozzle, and disintergrated using steam under a pressure of 1.9 atmospheres gauge.
  • the resulting shot which was formed of particles with a size between 0 and 3.5 mm., had the following chemical composition:
  • the shot particles with a size between 0.2 and 3.0 mm. were sieved out and annealed for 2 hours at 350 C.
  • the particles with a size of up to 0.2 mm. (undersize) and those with a size between 3.0 and 3.5 mm. (oversize) were used as a return material (see above) and melted again.
  • EXAMPLE 2 An acid-lined mains-frequency crucible induction furnace was used to melt therein 1060 kg. scrap iron (0.2% Si; 0.5% Mn; 0.4% C) and 42 kg. ferrosilicon 75 (73.4% Si).
  • the resulting melt was overheated to 1630 C., deoxidized using 0.8 kg. aluminum, and atomized with steam under a pressure of 1.9 atmospheres gauge.
  • the resulting shot was composed of The steel shot produced in the manner set forth in Examples 1 and 2 was tested in a blasting agent-testing machine (type KP 1 of Messrs. Georg Fischer, Schaflhausen) The tests were conducted at a velocity of 8000' r.p.m. of the centrifugal blower. This corresponded to a discharge velocity of about 80 m./ second for a diameter of 120 mm. of the centrifugal blower.
  • the testing machine was provided with seven bafile plates and a wear plate.
  • the particle wear index Z 50/11 is the index of wear resistance.
  • the symbol Z 50/ n represents the number of passages of 1000 grams blasting agent through the testing machine until the weight proportion of particles with a size larger than the nominal diameter 11 of the particles is found to have decreased to a value of 50% of the initial value;
  • a process for improving the wear resistance of steel shot which is (a) suitable for use as a blasting agent in the treatment of metal, stone, ceramic and glass surfaces, (b) formed of particles characterized by inner solidity, freedom from strains, smoothness, roundness and freedom from superficial cracks, and a particle size between 0.01 and 3.0 mm., and (c) contain between 1.1 and 3.3 weight percent silicon, between 0.05 and 0.4 weight percent carbon, between 0.1 and 0.8 weight percent manganese, between 0 and 1.0 weight percent of at least one customary steel-accompanying metals, selected from the group consisting of chromium, nickel, copper, titanium, aluminum, molybdenum and tungsten, the balance being iron, which comprises heating the steel shot for a period of between about 1 and 5 hours to temperatures between 200' and 500 C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Coating By Spraying Or Casting (AREA)
US842876A 1968-07-30 1969-07-18 Process for improving the wear resistance of steel shot Expired - Lifetime US3649370A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681758724 DE1758724A1 (de) 1968-07-30 1968-07-30 Verfahren zur Erhoehung der Verschleissfestigkeit von Stahlschrot

Publications (1)

Publication Number Publication Date
US3649370A true US3649370A (en) 1972-03-14

Family

ID=5695191

Family Applications (1)

Application Number Title Priority Date Filing Date
US842876A Expired - Lifetime US3649370A (en) 1968-07-30 1969-07-18 Process for improving the wear resistance of steel shot

Country Status (10)

Country Link
US (1) US3649370A (enrdf_load_stackoverflow)
AT (1) AT317959B (enrdf_load_stackoverflow)
BE (1) BE736815A (enrdf_load_stackoverflow)
CH (1) CH520770A (enrdf_load_stackoverflow)
DE (1) DE1758724A1 (enrdf_load_stackoverflow)
FR (1) FR2013995A1 (enrdf_load_stackoverflow)
GB (1) GB1226909A (enrdf_load_stackoverflow)
LU (1) LU59161A1 (enrdf_load_stackoverflow)
NL (1) NL6911575A (enrdf_load_stackoverflow)
SE (1) SE344078B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023985A (en) * 1975-09-29 1977-05-17 Cleveland Metal Abrasive, Inc. Steel abrasives and method for producing same
US4071381A (en) * 1976-09-07 1978-01-31 Cleveland Metal Abrasive, Inc. Steel abrasive materials
US5865385A (en) * 1997-02-21 1999-02-02 Arnett; Charles R. Comminuting media comprising martensitic/austenitic steel containing retained work-transformable austenite
RU2541262C2 (ru) * 2013-04-15 2015-02-10 Василий Серафимович Колпаков Металлокерамическая дробь

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE447393B (sv) * 1978-09-27 1986-11-10 Sumitomo Electric Industries Forfarande for framstellning av ett varmsmitt material av pulver

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023985A (en) * 1975-09-29 1977-05-17 Cleveland Metal Abrasive, Inc. Steel abrasives and method for producing same
US4071381A (en) * 1976-09-07 1978-01-31 Cleveland Metal Abrasive, Inc. Steel abrasive materials
US5865385A (en) * 1997-02-21 1999-02-02 Arnett; Charles R. Comminuting media comprising martensitic/austenitic steel containing retained work-transformable austenite
US6080247A (en) * 1997-02-21 2000-06-27 Gs Technologies Operating Company Comminuting media comprising martensitic/austenitic steel containing retained work-transformable austenite
RU2541262C2 (ru) * 2013-04-15 2015-02-10 Василий Серафимович Колпаков Металлокерамическая дробь

Also Published As

Publication number Publication date
GB1226909A (enrdf_load_stackoverflow) 1971-03-31
NL6911575A (enrdf_load_stackoverflow) 1970-02-03
AT317959B (de) 1974-09-25
FR2013995A1 (enrdf_load_stackoverflow) 1970-04-10
BE736815A (enrdf_load_stackoverflow) 1970-01-30
LU59161A1 (de) 1970-01-20
DE1758724A1 (de) 1971-02-11
SE344078B (enrdf_load_stackoverflow) 1972-03-27
CH520770A (de) 1972-03-31

Similar Documents

Publication Publication Date Title
CN104087867B (zh) 一种球磨机用高耐磨抗氧化耐磨球
US3649370A (en) Process for improving the wear resistance of steel shot
KR960005599B1 (ko) 제동브레이크 동체 제조용 주철
CN108842041A (zh) 一种可用于研磨强氧化性材料的多层耐磨球及其制备方法
US4194906A (en) Wear resistant low alloy white cast iron
US2376639A (en) Centrifugal throwing wheel
CN106544596B (zh) 一种铝合金化高硼高速钢复合轧辊及其制备方法
JPH02175846A (ja) 粉末高速度工具鋼
US20050066771A1 (en) Products for the protection of continuous cast moulds for cast-iron pipes
CN111778446A (zh) 一种含Mo高铬耐磨合金材料及其制备方法
CA1052599A (en) Wear resistant low alloy white cast iron
US4224064A (en) Method for reducing iron carbide formation in cast nodular iron
JPH0456749A (ja) 溶融金属に対する耐溶損性の優れた鋳造用金型または接溶湯器具
US3299482A (en) Gray iron casting process and composition
US3113861A (en) Austenitic steel alloy
US2633438A (en) Alloy and process
US2462122A (en) Method of casting, forging, and heat-treating cast iron grinding balls
CN109402494B (zh) 一种机车车辆用合金铸铁闸瓦及其制造方法
US3607226A (en) Ferrous melting stock containing a carbon additive and method
US1908740A (en) Car wheel and process of making same
US3392013A (en) Cast iron composition and process for making
US2716604A (en) Process for producing nodular iron
US3929423A (en) Hot work forging die block and method of manufacture thereof
Langford High speed steel made by liquid infiltration
US2646375A (en) Process for hardening alloy gray cast iron