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P92 CONSUMABLES
Alloy type
9%Cr steel alloyed with W, Mo, V, Nb, and N for high
temperature creep resistance.
Materials to be welded
ASTM
A 213 T92 (seamless tubes)
A 335 P92 (seamless pipes)
A 387 Gr 92 (plates)
A 182 F92 (forgings)
A 369 FP92 (forged & bored pipe)
EN
X10CrWMoVNb 9-2
Applications
These consumables are designed to weld equivalent 'type 92'
9%Cr steels modified with tungsten, vanadium, niobium,
nitrogen and a small addition boron to give improved long
term creep properties.
They are specifically intended for high integrity structural
service at elevated temperature so the minor alloy additions
responsible for its creep strength are kept above theminimum
considered necessary to ensure satisfactory performance. In
practice, weldments will be weakest in the softened
(intercritical) HAZ region of parentmaterial, as indicated by
so-called 'type IV' failure in transverse weld creep tests.
The rupture strength of P92 is up to 30% greater than P91,
and interest in its use is growing as a candidate for
components such as
headers, main steam piping and
turbine casings
, in fossil fuelled power generating plants.
Microstructure
In the PWHT condition the microstructure consists of
tempered martensite.
PWHT
Minimum preheat temperature 200°C with maximum
interpass temperature of 350°C; in practice a preheatinterpass
range of 200 – 300°C is normal. To ensure full
martensite transformation welds should be cooled to ~100°C
prior to PWHT; up to 50mm wall thickness can be cooled to
room temperature whilst thick wall forgings or castings
should not be cooled below ~80°C prior to PWHT.
ASME base material codes allowPWHT down to 730°C but
for weld metals PWHT is normally carried out in the range
750-770°C. Optimumproperties are obtainedwith PWHT at
760°C for 4 hours.
When compared with directly matching weld metal, the
addition of some nickel and reduction of niobiumprovides a
useful improvement in toughness after PWHT.
Additional information
D Richardot, J C Vaillant, A Arbab, W Bendick: "The
T92/P92 Book" Vallourec & Mannesmann Tubes, 2000.
Products available
Process
Product Specification
MMA
Chromet 92 --
TIG
9CrWV --
SAW
9CrWV (wire) --
LA491 (flux)
BS EN SA FB 255AC
LA492 (flux)
BS EN SA CS 155DC
FCW
Supercore F92 --
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A51
METRODE
WELDING CONSUMABLES
CHROMET 92
MMA all-positional electrode for joining P92 creep resisting s teel
Product description
Basic coated MMA electrode made on matching core wire. Moisture resistant coatings giving very low weld
metal hydrogen levels.
Recovery is approx 120% with respect to core wire, 65% with respect to whole electrode.
Specifications
None applicable.
ASME IX Qualification QW422
P-No 5B group 2, QW432 F-No --, QW442 A-No --
Composition
C Mn Si S P Cr Ni Mo W Nb V N B Al Cu
(weld metal wt %)
min 0.08 0.40 -- -- -- 8.0 -- 0.30 1.5 0.04 0.15 0.03 0.001 -- --
max
0.13 1.00 0.40 0.015 0.020 9.5 0.80 0.60 2.0 0.07 0.25 0.07 0.005 0.03 0.15
typ
0.11 0.6 0.25 0.01 0.01 9 0.6 0.45 1.7 0.05 0.2 0.05 0.003 <0.01 <0.05
All-weld mechanical
PWHT 760°C / 2-4h min typical ----- High Temperature -----
properties
+550°C +600°C +650°C
Tensile strength
MPa 620 740 511 422 340
0.2% Proof stress
MPa 440 630 419 320 229
Elongation on 4d
% 17 22 15 19.5 19.5
Elongation on 5d
% 16 19 14 18 18
Reduction of area
% -- 50 64 73 80
Impact energy
+ 20°C J -- 60 -- -- --
Hardness
HV -- 230-260 -- -- --
Packaging data
ø mm 2.5 3.2 4.0 5.0
length mm
300 350 350 450
kg/carton
12 14.1 13.5 16.5
pieces/carton
762 393 267 150
Operating parameters
DC +ve. AC (OCV 70V min)
ø mm 2.5 3.2 4.0 5.0
min A
70 80 100 140
max A
110 140 180 240
Storage
3 hermetically sealed ring-pull metal tins
per carton, with unlimited shelf life. Direct use from tin will give
hydrogen
<5ml/100g weld metal during 8h working shift.
For electrodes that have been exposed:
Redry
250 – 300°C/1-2h to ensure H2 < 10ml/100g, 300 – 350°C/1-2h to ensure H2 < 5ml/100g. Maximum
420°C, 3 cycles, 10h total.
Storage
of redried electrodes at 100 – 200°C in holding oven, or 50 – 150°C in heated quivers: no limit, but
maximum 6 weeks recommended.
Fume data
Fume composition (wt %)
Fe Mn Ni Cr Cu Pb F OES (mg/m
3)
15 5 < 0.1 < 3 < 0.1 < 0.1 18 1.7
NET-LITE
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A52
METRODE
WELDING CONSUMABLES
9CrWV
Solid wire for TIG and SAW
Product description
Solid wire, non-copper coated, for TIG and SAW welding.
Specifications
None applicable.
ASME IX Qualification QW422
P-No 5B group 2, QW432 F-No --, QW442 A-No --
Composition
C Mn Si S P Cr Ni Mo W Nb V N B Al Cu
(wire wt %)
min 0.08 0.40 -- -- -- 8.0 -- 0.30 1.5 0.04 0.15 0.03 0.001 -- --
max
0.13 1.00 0.40 0.015 0.015 9.5 0.80 0.60 2.0 0.07 0.25 0.07 0.005 0.03 0.15
Typ
0.11 0.7 0.30 0.01 0.01 9 0.5 0.45 1.7 0.06 0.2 0.05 0.003 <0.01 <0.05
All-weld mechanical
PWHT 760°C / 2 – 4h min TIG ----- High Temperature TIG -----
properties
typical +550°C +600°C +650°C
Tensile strength
MPa 620 800 455 387 312
0.2% Proof stress
MPa 440 700 374 282 200
Elongation on 4d
% 16 22 24.5 20.5 28
Elongation on 5d
% -- 19 22.5 19 25.5
Reduction of area
% -- 70 82 85 89
Impact energy
+ 20°C J -- 220 -- -- --
Hardness
HV (mid) -- 265 -- -- --
Parameters
TIG SAW MIG
Shielding
Argon LA491/LA492 flux 9CrWV is not recommended
Diameter, mm
2.4 2.4 for MIG welding.
Current
DC- DC+ Supercore F92 should be used.
Typical parameters
100A, 12V 450A, 30V, 450mm/min
Packaging data
ø mm TIG SAW
2.4
5kg tube 25kg coil
3.2
5kg tube 20kg coil
Fume data
Fume composition (wt %); TIG and SAW fume is negligible:
Fe Mn Ni Cr Mo Cu OES (mg/m
3)
50 4 < 0.4 6 0.5 < 0.5 5
LA491 & LA492 Flux
Sub-arc fluxes for use with 9CrWV solid wire
Product description
Agglomerated basic submerged arc welding fluxes
Specifications LA491
BS EN 760 SA FB 255 AC
LA492
BS EN 760 SA CS 155 DC H5
Composition
LA491
: LA492:
(weld metal wt %)
15% SiO2 + Ti O2 20% SiO2
40% CaO + Mg O 40% MgO + CaO
20% AlO
3 + MnO 20% Al2O3 + K2O
25% CaF
2 20% CaF2
Basicity index ~2.7 (Boniszewski) Basicity index ~2.25 (Boniszewski)
Analysis deposit
C Mn Si S P Cr Ni Mo W Nb V N B
(typical)
9CrWVWire 0.11 0.7 0.3 0.01 0.01 9.0 0.5 0.4 1.7 0.06 0.19 0.05 0.003
LA491 dep.
0.09 0.7 0.3 0.01 0.01 8.5 0.5 0.4 1.7 0.04 0.16 0.04 0.001
LA492 dep.
0.08 0.7 0.3 0.01 0.01 8.4 0.4 0.4 1.6 0.04 0.14 0.04 0.001
NET-LITE
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A53
METRODE
WELDING CONSUMABLES
LA491 & LA492 Flux (continued)
Sub-arc fluxes for use with 9CrWV solid wire
All-weld mechanical
SAW & LA491 SAW & LA492
properties
PWHT 760°C / 2 – 4h min typical typical
Tensile strength
MPa 620 740 700
0.2% Proof stress
MPa 440 630 580
Elongation on 4d
% 16 20 25
Reduction of area
% -- 60 65
Impact energy
+ 20°C J -- 35 45
Hardness
HV (mid) -- 250 225
Parameters
AC or DC+ 800A maximum
Packaging data
LA491:
25kg sealed drums LA492: 22.5kg sealed drums
Preferred storage <60%RH, > 18°C.
If flux becomes damp, rebake at 300 – 350°C / 1 – 2hours to restore to as-packed condition. For criticalwork, it
is recommended to redry to ensure <5ml H
2/100g.
SUPERCORE F92
All-positional flux cored wire
Product description
All-positional flux cored wire designed to weld equivalent P92 steels. Rutile flux system with an alloyed strip
producing weld metal recovery of about 90%.
Specifications AWS A5.29
No current national standards.
ASME IX Qualification QW432
F-No -, QW442 A-No -
Composition
C Mn Si S P Cr Ni Mo W Nb V N B Al Cu
(wire wt %)
min 0.08 0.40 -- -- -- 8.5 0.30 0.30 1.5 0.03 0.15 0.03 0.001 -- --
max
0.13 1.20 0.40 0.015 0.020 9.5 0.80 0.60 2.0 0.07 0.25 0.07 0.005 0.03 0.15
Typ
0.11 0.8 0.30 0.01 0.017 9 0.5 0.45 1.7 0.04 0.2 0.04 0.003 <0.01 <0.05
All-weld mechanical
PWHT 760°C / 4-6h typical --------------- High Temperature ------------
properties
+550°C +600°C +650°C +700°C
Tensile strength
775 471 400 308 215
0.2% Proof stress
650 385 294 194 125
Elongation on 4d
21 18.5 25 26.5 25.5
Elongation on 5d
18 17 22.5 24.5 23.5
Reduction of area
50 68 77 81 86
Impact energy
+ 20°C 25 -- -- -- --
Hardness
260 -- -- -- --
Operating parameters
Shielding gas:
80%Ar-20%CO2 (or 15 – 25%CO2) or 100% CO2 at 20-25l/min.
Current:
DC+ve ranges as below:
ø welding position amp-volt range
* typical stickout
1.2mm
(0.045in) Positional 140-170A, 24-26V
160A, 25V 15-25mm
*
Using 100%CO2 the voltage should be increased by 1-2V
Packaging data
Spools vacuum-sealed in barrier foil with cardboard carton: 15kg (33 lbs)
The as-packed shelf life is virtually indefinite.
Resistance to moisture absorption is high, but to maintain the high integrity of the wire surface and prevent any
possibility of porosity, it is advised that part-used spools are returned to polythene wrappers.
Where possible, preferred storage conditions are 60% RH max, 18°C min.
Fume data
Fume composition (wt %), shielding gas 80%Ar-20%CO2:
Fe Mn Ni Cr
3 Cr6 Cu F OES (mg/m3)
18 8 < 0.5 3 3 < 1 8 1.7
