SYMPOSIA PAPER Published: 01 January 1986
STP17386S

A New Wide Plate Arrest Test (SCA Test) on Weld Joints of Steels for Low Temperature Application

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As a realistic and practical criterion for brittle fracture arrest in low temperature storage tanks, the present authors propose the short crack arrest (SCA) concept. This aims at arresting brittle fracture before propagation to a catastrophe. In order to investigate the capability of steel materials from the viewpoint of this concept, two types of wide plate tests, the SCA tests on weld heat-affected zone (HAZ) and base metal, were developed. These two test methods were designed to simulate the run-and-arrest phenomenon of brittle fracture in actual storage tanks.

The two types of tests, together with the compact crack arrest (CCA) test, were applied to base metals and welded joints of a wide range of steels for low temperature application. Efforts were made to clarify the effects of base metal chemical compositions and conditions for welding on the weld HAZ characteristics.

The results revealed that addition of about 3% nickel to the base metal significantly improved the weld HAZ arrest toughness. It was also shown that the SCA capability of steels could be predicted from the Ka values obtained by the CCA test.

Author Information

Tanaka, K
R&D Laboratories II, Nippon Steel Corporation, Sagamihara, Japan
Sato, M
R&D Laboratories II, Nippon Steel Corporation, Sagamihara, Japan
Ishikawa, T
R&D Laboratories II, Nippon Steel Corporation, Sagamihara, Japan
Takashima, H
R&D Laboratories II, Nippon Steel Corporation, Sagamihara, Japan
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Details
Developed by Committee: E08
Pages: 22–40
DOI: 10.1520/STP17386S
ISBN-EB: 978-0-8031-4972-4
ISBN-13: 978-0-8031-0472-3