A NONDESTRUCTIVE METHOD TO DETECT PIPES AND CAVITIES IN HOT STEEL BLOOMS DURING THE ROLLING-PROCESS BY MEANS OF BETATRON, X-RAY-IMAGE-INTENSIFIER AND TELEVISION-SETUP
A method is described permitting immediate detectability of pipes in hot 4 to 12 inches square blooms under continuous rolling-mill conditions. A 31-Mev- betatron is used as radiation source. The radiation image is viewed by an x-ray image intensifier having an effective primary screen diameter of 8.7 inches and of a highly sensitive image orthicon television equipment. In the range of 4 to 8 inches steel, the German Industrial Norm-wirepenetrameter sensitivity is 2.3%. Pipes with a width of 0.125 inch in the direction of the x-ray beam, corresponding to a pipe sensitivity of 1.5%, related to the steel thickness penetrated by the x rays, are made visible in travelling blooms. It is impossible to distinguish between slag-containing and slag-free shrinkage cavities. The maximum bloom speed allowable for viewing the radiation image is 40 feet/min. More than 1000 blooms 8.4 and 9.5 inches square can be tested under mill operating conditions. The possibilities which the radiation equipment offers for the study of pipe formation in relation to the casting and freezing conditions for various steel types are reviewed. (auth)
- Research Organization:
- Phoenix-Rheirohr AG, Dusseldorf, Ger.
- NSA Number:
- NSA-14-007751
- OSTI ID:
- 4185567
- Journal Information:
- Nondestructive Testing, Vol. Vol: 18; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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