Roles of microalloying elements in hydrogen induced cracking resistant property of HSLA steels
- China Steel Corp., Kaohsiung (Taiwan, Province of China)
The effects of alloying elements such as niobium, copper, chromium, molybdenum, and titanium in high-strength, low-alloy (HSLA) steels on hydrogen induced cracking (HIC) were investigated. The HIC test was performed to NACE TM-02-84 in BP (saturated H[sub 2]S synthetic sea water) and NACE solutions. The test data were analyzed with an optical microscope, scanning electron microscope, electron probe microanalyzer, Auger electron spectrometer, transmission electron microscope, and an image analyzer. Results showed the addition of Nb increased the aspect ratio of inclusions and decreased HIC resistance. In BP solution, Cu-bearing steel formed a protective film of [gamma]-Fe[sub 2]O[sub 3] enriched with Cu on the outside and FeS on the inside. Cr and Mo showed a synergistic effect on the formation of low-temperature transformation products and the increase of HIC sensitivity. The suitable parameter for these two elements on HIC sensitivity was Cr/15 + Mo/5, and the critical value of this parameter was 0.1%. Additionally, coarse TiN precipitates, as well as elongated MnS inclusions, were the initiation sites of HIC. Both cooperated to result in HIC.
- OSTI ID:
- 6463670
- Journal Information:
- Corrosion (Houston); (United States), Vol. 49:5; ISSN 0010-9312
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of combined silicon and molybdenum alloying on the size and evolution of microalloy precipitates in HSLA steels containing niobium and titanium
Evaluation of high steel grade linepipes for sour service with special corrosion testing
Related Subjects
CHROMIUM
METALLURGICAL EFFECTS
COPPER
LOW ALLOY STEELS
HYDROGEN EMBRITTLEMENT
MOLYBDENUM
NIOBIUM
TITANIUM
AUGER ELECTRON SPECTROSCOPY
CORROSION
ELECTRON MICROPROBE ANALYSIS
IMAGE PROCESSING
INCLUSIONS
IRON OXIDES
IRON SULFIDES
MANGANESE SULFIDES
MATERIALS TESTING
NATURAL GAS INDUSTRY
OPTICAL MICROSCOPY
PETROLEUM INDUSTRY
PROTECTIVE COATINGS
SCANNING ELECTRON MICROSCOPY
SEAWATER
TITANIUM NITRIDES
TRANSMISSION ELECTRON MICROSCOPY
ALLOYS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COATINGS
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ELEMENTS
EMBRITTLEMENT
HYDROGEN COMPOUNDS
INDUSTRY
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
MANGANESE COMPOUNDS
METALS
MICROANALYSIS
MICROSCOPY
NITRIDES
NITROGEN COMPOUNDS
NONDESTRUCTIVE ANALYSIS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
PROCESSING
SPECTROSCOPY
STEELS
SULFIDES
SULFUR COMPOUNDS
TESTING
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WATER
360105* - Metals & Alloys- Corrosion & Erosion