POWER December 2021 - S10
INDUSTRY INSIGHT
SPONSORED CONTENT
Avoid valve delamination issues with
chromium carbide hardfacing
Liberation of Alloy 6, or Cobalt Alloy, hardfacing from valves
in steam systems, is a significant industry issue, causing millions
of dollars in repair costs and months of lost production.
More than half of high temperature steam valves had shown
some degree of cobalt alloy delamination in one inspection.
Cracking was observed in valve components at the alloy/steel
interface and in the weld dilution zone formed between the
steel and cladding. Disbonding or delamination of the weld
hardfacing from the valve body occurred, causing collateral
damage to components in the plant and valve failure.
" ValvTechnologies' IsoTech parallel slide gate
valves have been operating on our HRSGs
for seven years. The chromium carbide hardcoating
technology is impervious to the
effects of high-temperature cycling typically
experienced in combined-cycle main-steam
isolation and HRH applications. "
- Steam Turbine Specialist
There is a solution to the industry-wide problem
and preventing issues associated with delamination.
ValvTechnlogies' chromium carbide coating is much harder
than cobalt alloy coating, especially at 1,000°F (538°C). The
hardfacing is so effective that ValvTechnologies guarantees their
IsoTech parallel slide gate valve, provided with recommended
hardcoating for high-pressure and temperature, supercritical
and ultra-supercritical applications, will not delaminate for 10
years or 10,000 cycles - whichever comes first.
ValvTechnologies' parallel slide gate valves for demanding
combined-cycle service rely on the manufacturer's proprietary
coating, which is much harder than Alloy 6, 68.5 Rockwell C
versus 30 for Alloy 6 at 1000°F, a difference that increases with
temperature. The coating is applied to critical parts in highvelocity
oxygen fuel (HVOF)spray booths using a compressive
spray procedure to achieve high bond strength. The HVOF
coating process causes no intermetallic Sigma phase formation
and results in a very strong bond to the base metal.
The hard coating on the guide ensures the discs are kept
parallel through the entire valve stroke. As the valve cycles .under
differential pressure, the hard surfaces burnish and polish each
other, avoiding the scratching and galling cited by some users
not using ValvTechnologies' valves.
Learn More at:
www.valv.com
.
10
Figure 3 Damaged valve seat due to cobalt alloy delamination.
www.powermag.com
POWER | December 2021
Figure 2 ValvTechnologies' HVOF applied coating after 7 years cyclic service.
Figure 1 Cobalt alloy hardfacing, susceptible to cracking.
https://www.valv.com
http://www.powermag.com
POWER December 2021
Table of Contents for the Digital Edition of POWER December 2021
POWER December 2021 - Cover1
POWER December 2021 - Cover2
POWER December 2021 - 1
POWER December 2021 - 2
POWER December 2021 - 3
POWER December 2021 - 4
POWER December 2021 - 5
POWER December 2021 - 6
POWER December 2021 - 7
POWER December 2021 - 8
POWER December 2021 - 9
POWER December 2021 - 10
POWER December 2021 - 11
POWER December 2021 - 12
POWER December 2021 - 13
POWER December 2021 - 14
POWER December 2021 - 15
POWER December 2021 - 16
POWER December 2021 - 17
POWER December 2021 - 18
POWER December 2021 - 19
POWER December 2021 - 20
POWER December 2021 - SCover1
POWER December 2021 - SCover2
POWER December 2021 - S1
POWER December 2021 - S2
POWER December 2021 - S3
POWER December 2021 - S4
POWER December 2021 - S5
POWER December 2021 - S6
POWER December 2021 - S7
POWER December 2021 - S8
POWER December 2021 - S9
POWER December 2021 - S10
POWER December 2021 - S11
POWER December 2021 - S12
POWER December 2021 - S13
POWER December 2021 - S14
POWER December 2021 - S15
POWER December 2021 - S16
POWER December 2021 - SCover3
POWER December 2021 - SCover4
POWER December 2021 - 21
POWER December 2021 - 22
POWER December 2021 - 23
POWER December 2021 - 24
POWER December 2021 - 25
POWER December 2021 - 26
POWER December 2021 - 27
POWER December 2021 - 28
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POWER December 2021 - 30
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POWER December 2021 - 33
POWER December 2021 - 34
POWER December 2021 - 35
POWER December 2021 - 36
POWER December 2021 - 37
POWER December 2021 - 38
POWER December 2021 - 39
POWER December 2021 - 40
POWER December 2021 - Cover3
POWER December 2021 - Cover4
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