Menu
Search
Filters
Close
Menu

03491 PREMATURE FAILURE OF A 9 CHROMIUM VANADIUM-MODIFIED SUPERHEATER TUBE

Picture for 03491 PREMATURE FAILURE OF A 9 CHROMIUM
Available for download
Product Number: 51300-03491-SG
ISBN: 03491 2003 CP
Author: Gordon P. Kallenberg
$0.00
$20.00
$20.00
The failure of a 9 Chromium Vanadium-Modified superheater tube in a Heat Recovery Steam Generation (HRSG) boiler at a Co-Generation (Co-Gen) plant took place only 20 hours after the plant was brought on-line. Final failure of the tubing occurred due to tensile overload in the presence of preexisting cracks that were concluded to have been introduced during hydro-testing and a total of 3 startup cycles that took place within the first 20 hours of operation. The cracks were a consequence of brittle crack initiation that occurred in a low-toughness, high hardness region in a heat-affected zone (HAZ) at the tube-to-stub end weld at the discharge header. The high hardness was attributed to a line of arc strikes and weld spatter along the HAZ on the tube side of the weld joint. The weld spatter was found to have a composition of 73 percent nickel and 12 percent chromium. HAZ hardness under the line of arc strikes/weld spatter reached a maximum of 303 Brinell, while the hardness of the HAZ away from the failure, and the tube base metal, were 210-220 Brinell and 150-170 Brinell, respectively. The HAZ hardness within the failure region supported the conclusion that the weld spatter most likely originated from an event external to the fabrication of the superheater coil that took place after welding and Post Weld Heat Treatment (PWHT) of the tube/discharge header had been completed. Keywords: brittle fracture, weld spatter, arc strikes, superheater tubing, 9 Chromium Vanadium- Modified alloy steel, hydro-test, tensile overload, HRSG, Co-Gen plant.
The failure of a 9 Chromium Vanadium-Modified superheater tube in a Heat Recovery Steam Generation (HRSG) boiler at a Co-Generation (Co-Gen) plant took place only 20 hours after the plant was brought on-line. Final failure of the tubing occurred due to tensile overload in the presence of preexisting cracks that were concluded to have been introduced during hydro-testing and a total of 3 startup cycles that took place within the first 20 hours of operation. The cracks were a consequence of brittle crack initiation that occurred in a low-toughness, high hardness region in a heat-affected zone (HAZ) at the tube-to-stub end weld at the discharge header. The high hardness was attributed to a line of arc strikes and weld spatter along the HAZ on the tube side of the weld joint. The weld spatter was found to have a composition of 73 percent nickel and 12 percent chromium. HAZ hardness under the line of arc strikes/weld spatter reached a maximum of 303 Brinell, while the hardness of the HAZ away from the failure, and the tube base metal, were 210-220 Brinell and 150-170 Brinell, respectively. The HAZ hardness within the failure region supported the conclusion that the weld spatter most likely originated from an event external to the fabrication of the superheater coil that took place after welding and Post Weld Heat Treatment (PWHT) of the tube/discharge header had been completed. Keywords: brittle fracture, weld spatter, arc strikes, superheater tubing, 9 Chromium Vanadium- Modified alloy steel, hydro-test, tensile overload, HRSG, Co-Gen plant.
PRICE BREAKS - The more you buy, the more you save
Quantity
1+
5+
Price
$20.00
$20.00
Product tags
Also Purchased
Picture for 03492 CHEMICAL TREATMENT OF GAS TURBINE
Available for download

03492

Product Number: 51300-03492-SG
ISBN: 03492 2003 CP
Author: James Robinson, GE Betz
$20.00
Picture for 03495 HRSG TUBE FAILURES: PREDICTION, DIAGNOSIS
Available for download

03495 HRSG TUBE FAILURES: PREDICTION, DIAGNOSIS AND CORRECTIVE ACTIONS

Product Number: 51300-03495-SG
ISBN: 03495 2003 CP
Author: Frederick C. Anderson, Peter S. Jackson, David S. Moelling, Frank M. Glasgow
$20.00
Picture for 03499 THE EFFECT OF ALLOY COMPOSITION ON THE
Available for download

03499 THE EFFECT OF ALLOY COMPOSITION ON THE PERFORMANCE OF STAINLESS STEELS IN EXHAUST GAS ENVIRONMENTS

Product Number: 51300-03499-SG
ISBN: 03499 2003 CP
Author: B. A. Pint, R. Peraldi, P. E Tortorelli
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support