Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels

Kim Wallin

Research output: Book/ReportReport

Abstract

A methodology for selecting the minimum usage temperature for ferritic steels has previously been developed. The methodology is based on the statistical correlation between fracture toughness and Charpy-V, and has been verified for modern extra high strength steels. Here, the methodology is verified experimentally with different test geometries for old (post Second World War quality) thin low strength steels. Based upon the investigations the following can be concluded: 1. The validation of the methodology as a whole appears successful. 2. The methodology seems capable of producing reliable "best" and "safe" estimates with equal accuracy. 3. Compared to extra high strength steels, the methodology shows a tendency to treat low strength steel somewhat more conservatively, but not unrealistically. 4. The methodology appears superior to all previous similar methodologies. 5. The results show that a single transition temperature toughness requirement of 28/27 J can well be applied for these types of old steels. 6. For the first time it is possible to develop rules that treat low and high strength steels impartially and are capable of giving accurately defined safety levels for different situations.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages56
ISBN (Print)951-38-4654-7
Publication statusPublished - 1995
MoE publication typeNot Eligible

Publication series

SeriesVTT Publications
Number216
ISSN1235-0621

Fingerprint

High strength steel
Toughness
Steel
Ferritic steel
Superconducting transition temperature
Fracture toughness
Geometry
Temperature

Keywords

  • steels
  • mechanical properties
  • strength
  • testing
  • validation
  • toughness
  • stress
  • plasticity
  • fracture strength
  • Charpy impact tests

Cite this

Wallin, K. (1995). Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 216
Wallin, Kim. / Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels. Espoo : VTT Technical Research Centre of Finland, 1995. 56 p. (VTT Publications; No. 216).
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Wallin, K 1995, Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels. VTT Publications, no. 216, VTT Technical Research Centre of Finland, Espoo.

Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels. / Wallin, Kim.

Espoo : VTT Technical Research Centre of Finland, 1995. 56 p. (VTT Publications; No. 216).

Research output: Book/ReportReport

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AB - A methodology for selecting the minimum usage temperature for ferritic steels has previously been developed. The methodology is based on the statistical correlation between fracture toughness and Charpy-V, and has been verified for modern extra high strength steels. Here, the methodology is verified experimentally with different test geometries for old (post Second World War quality) thin low strength steels. Based upon the investigations the following can be concluded: 1. The validation of the methodology as a whole appears successful. 2. The methodology seems capable of producing reliable "best" and "safe" estimates with equal accuracy. 3. Compared to extra high strength steels, the methodology shows a tendency to treat low strength steel somewhat more conservatively, but not unrealistically. 4. The methodology appears superior to all previous similar methodologies. 5. The results show that a single transition temperature toughness requirement of 28/27 J can well be applied for these types of old steels. 6. For the first time it is possible to develop rules that treat low and high strength steels impartially and are capable of giving accurately defined safety levels for different situations.

KW - steels

KW - mechanical properties

KW - strength

KW - testing

KW - validation

KW - toughness

KW - stress

KW - plasticity

KW - fracture strength

KW - Charpy impact tests

M3 - Report

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Wallin K. Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels. Espoo: VTT Technical Research Centre of Finland, 1995. 56 p. (VTT Publications; No. 216).