EFFECTS OF ALUMINUM ADDITIONS AND VARIATIONS IN FINISHING TEMPERATURE ON PROPERTIES OF HOT-ROLLED EXPERIMENTAL OPEN-HEARTH STEELS
The results obtained in this investigation on experimental open-hearth steels of ship plate composition justify the following conclusions: 1. The Charpy and tear test transition temperatures of hot-rolled plates were not changed significantly by aluminum contents in the range up to 0.04 per cent. 2. Variations in the temperature of the final hot-rolling pass in the range from 1650 F to 2050 F influenced the transition temperature of the laboratory rolled steel. Each increase of 100 F in finishing temperature raised the transition temperature 6 F in Charpy keyhole tests and 8 F in tear tests. 3. The ferrite grain size of hot-rolled steels of ship plate composition was independent of variations in aluminum content up to 0.04 per cent. Higher finishing temperatures produced coarser ferrite grain sizes. 4. Steels containing more than 0.01 percent acid-soluble aluminum had higher austenite grain-coarsening temperatures than semikilled steels. Therefore, normalizing aluminum killed steels from 1650 F produced finer ferrite grains than normalizing semikilled steels from the same temperature. 5. Normalizing from 1650 F lowered the Charpy transition temperatures of the ship plate steels investigated. The beneficial effects of normalizing were more pronounced for aluminum killed steels than for semikilled steels.
Battelle Memorial Institute505 King Avenue
Columbus, OH United States 43201
Ship Structure CommitteeNational Academy of Science, 2101 Constitution Avenue, NW
Washington, DC United States 20418
- Frazier, R H
- Boulger, F W
- Lorig, C H
- Publication Date: 1955-7-15
- Features: References;
- Pagination: 33 p.
- TRT Terms: Alloy steel; Hulls; Plate bearing test; Plating (Ships); Shipbuilding steel; Tear strength; Transition point
- Identifier Terms: Ship Structure Committee
- Uncontrolled Terms: Hull plating
- Old TRIS Terms: Deoxidizers; Ship steels; Tear tests
- Subject Areas: Design; Environment; Highways; Marine Transportation; Materials;
- Accession Number: 00331292
- Record Type: Publication
- Source Agency: Ship Structure Committee
- Report/Paper Numbers: SSC- 90 Prog Rpt.
- Contract Numbers: NObs-53239
- Files: TRIS
- Created Date: May 21 1981 12:00AM