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  • Electrodes for heat & creep resisting steel
  • E7018-A1
  • E8018-B2
  • E9018-B3
  • E8018-B6
  • E8018-B8
  • E9015-B91

Hydrogen controlled iron powder type electrode yielding a ductile and creep resistant weld deposit containing about 0.5% Mo which helps to improve elevated temperature performance over that of C-Mn steels.

APPLICATIONS :

Pressure pipelines operating at high temperatures, boiler tubes, boiler plates of silimar composition & requiring good creep resistance for service temperature upto 500oC.

CHARACTERISTICS :

It represents a unique combination of numerous features which every welder and welding engineer look for on shop floor and at erection site. In particular, the 2.5 mm diameter electrode displays highly satisfactory behavior in welding of pipes.

  •   Ease of operation
  •   Smooth and stable arc which is easy to strike & restrike, combined with low spatter and with due control on molten pool.
  •   Slag detachability with little effort
  •   Finely rippled bead with regular profile
  •   Welds of consistent X-ray quality
  •   Weld metal which possesses excellent mechanical properties and displays resistance to cracking caused by heavy stresses and / or hydrogen
  •   A higher level of metal recover at 100- 110%
  •   Resistance to moisture pick-up

CHEMICAL ANALYSIS OF ALL WELD DEPOSIT (%) :

E7018 welding electrodes represent a unique combination of numerous features which every welder and welding engineer look for on shop floor and at erection site :

C Mn Si S P Mo
0.09 max 0.50-0.90 0.65 max 0.03 max 0.03 max 0.40-0.65

ALL WELD MECHANICAL PROPERTIES: (After SR as per SFA 5.5)
UTS (MPa) 0.2% Proof stress (MPa) Elongation (L = 4d CVN Impact energy (Joules)
510 Min 420 Min 22 Min At +20oC
Typical 550 Typical 460 Typical 26 >80

Hardness (After SR) 200BHN Max. Hydrogen in weld metal 4ml Max/100 gms. (Mercury Method).

WELDING CURRENT RANGES & PACKING DATA FOR SIZES MANUFACTURED :
Dia (mm) 2.5 3.15 4.0 5.0 6.3
Length (mm) 350 450/350 450/350 450 450
Current Range (Amp) DC(+) or AC (70V) 70-90 100-130 140-170 170-240 270-340
Pieces per carton 125 90 60 40 25
NOTES ON USAGES :
  •  Use short arc to the extent possible.
  •  Use of DC(+) is recommended for achieving high standard of weld quality.
  •  Redry electrode for one hour at 300oC – 350oC before use. (for storage conditions & redrying schedule, please refer to our booklet on L.H. electrodes).
  •  Preheat & Interpass temperature : 100oC-150oC for plate thickness upto 10mm & 200oC for higher thickness. These temperature should be maintained during the entire welding operation.
  •  Postweld heat treatment: Stress Reliving, when required, at 600oC – 650oC with minimum soaking period of 30 minutes.
  •  Special batches can be manufactured to meet impact test requirements at subzero temperatures down to -30oC.

Hydrogen controlled iron power type electrode designed for depositing weld metal of 1.25 Cr-0.5 Mo steel with good creep resistance at service temperature upto 550oC. in addition, it displays good resistance to corrosion in heated steam and to corrosion in processing high sulphur crude oil up to 450oC.

Application
  •   Boilers
  •   Pressure vessels.
  •   Headers
  •   High pressure piping
  •   Heat exchangers and condensers in power generation, oil refineries, chemical and petrochemical industries

CHEMICAL ANALYSIS OF ALL WELD DEPOSIT (%)
C Mn Si Cr Mo S P
0.05-0.10 0.05-0.90 0.50 max 1.0-1.50 0.40-0.65 0.025 max 0.025 max

ALL WELD MECHANICAL PROPERTIES
PWHT UTS (Mpa) 0.2% Proof Stress (Mpa) % Elongation (L=4d) CVN Impact Energy (J) (+20oC)
690o/1hr 580-720 500-600 22-27 100-140
690o/1hr 560 min 460 min 24-29

Hardness: 250 BHN (as welded)
215 BHN max after PWHT at 690o + 10oC for 3 hrs

Hydrogen in weld metal : 5ml / 100g.max
(Mercury method)
Moisture content < 0.20%

WELDING CURRENT RANGES FOR SIZES MANUFACTURED use DC+ or AC (70 V Min)
Dia (mm) 2.5 3.15 4.00 5.00 6.30
Length (mm) 350 450 450 450 450
Current (amp) 70-100 100-140 140-180 180-240 250-320
NOTES ON USAGES :
  •  Redrying cycle:
    (a) 250oC/1-2 hr to control hydrogen below 10ml/100gm;
    (b) 325oC/1-2 hr to control hydrogen below 5ml/100gm
  •  Avoid overdrying so as to prevent damage to coating. Restrict redrying to two cycles by using holding oven & quivers with temperature of 80-100oC.
  •  For detailed information on storage & redrying, please refer to our notes on L.H. Electrodes (copy available on request).
  •  Use short arc & minimize weaving to the extent possible.
  •  Due attention has to be given to preheat & interpass temperature to ensure crack free welds & control on hardness of weld deposit & HAZ.
  •  Preheat-interpass temperature range 150o-300oc depending on thickness for section of < 12.5mm – 100 – 150oC.
  •  In welding thick sections (over 25mm), it is safe practice to maintain temperature of 200oC-250oC for 1 -2 hours after completion of welding. This facilitates reduction in hydrogen level.

Additional Information

PWHT – There are differences in national codes: AWS 690oC/1hr; BS 650oC/1hr, DIN 690oC ½ hr.min

A hydrogen controlled basic coated iron powder type electrode designed for welding creep resisting steels and heat treatable steels. The weld deposit is of 5 Cr-0.5 Mo steel type.

Application

The 5Cr-0.5Mo steel deposit is suitable for elevated temperature service upto 600oC. It displays good corrosion resistance in superheated steam, hot hydrogen gas & high sulphur crude oil. Hence, it is recommended for use in boiler, super-heater, heat exchanger, piping & pressure vessels in oil refineries.

GENERAL CHARACTERISTICS:

It represents a unique combination of numerous features which every welder and welding engineer look for on shop floor and at erection site.

  •  Ease of operation.
  •  Smooth & stable arc which is easy to strike and restrike.
  •  Slag detachability with little effort
  •  Finely rippled bead with regular profile.
  •  Welds of consistent X-ray quality.
  •  A higher level of metal recover at 100- 110%.

CHEMICAL ANALYSIS OF ALL WELD DEPOSIT (%)
C Mn Si S P Cr Mo
0.050-0.10 1.00 Max 0.60 max 0.025 max 0.025 max 4.0-6.0 0.45-0.65

ALL WELD MECHANICAL PROPERTIES: (After PWHT as per SFA 5.5)
Ultimate Tensile Strength (MPa) 0.2% Proof stress (MPa) Elongation (L = 4d)%
550 min 460 min 20-28

WELDING CURRENT RANGES & PACKING DATA FOR SIZES MANUFACTURED :
Use DC+ or AC (70V Min)
Dia (mm) 2.50 3.15 4.00 5.00
Length (mm) 350 450 450 450
Current (Amp) 70-100 100-140 140-180 180-240
NOTES ON USAGES :
  •  Redrying cycle:
    (a)250oC/1-2 hr to control hydrogen below 10ml/100gm; (b)325oC/1-2 hr to control hydrogen below 5ml/100gm
  •  Avoid overdrying so as to prevent damage to coating. Restrict redrying to two cycles by using holding oven & quivers with temperature of 80-100oC.
  •  For detailed information on storage & redrying, please refer to our notes on L.H. Electrodes (copy available on request)..
  •  Use short arc & minimize weaving to the extent possible.
  •  Due attention has to be given to preheat & interpass temperature to ensure crack free welds & control on hardness of weld deposit & HAZ.
  •  Preheat-interpass temperature range 150o-300oc depending on thickness for section of < 12.5mm – 100 – 150oC.
  •  In welding thick sections (over 25mm), it is safe practice to maintain temperature of 200oC-250oC for 1 -2 hours after completion of welding. This facilitates reduction in hydrogen level to prevent hydrogen cracking, especially in highly restrained joints.
  • 8.As per SFA 5.5 – 2015
    Preheat & Interpass : 180o – 230oC
    PWHT : 740oC + 15oC for one hour.

Plates ASTM A 387 Gr.5 (Pressure Vessels)
Plates ASTM A 155 Gr. 5Cr.&
ASTM A 335 Gr. P5 & P5b (high silicon)
Tubes A199 Gr. T5 (refinery service)
A 213 Gr. T5 & T5b (boiler superheaters)
DIN 12 CrMo 19 5 (1.7362), X-7 CrMo 6 1 – (1.7373) X-11 CrMo 6 1 – (1.7374)
Castings ASTM A 217 C5
DIN GS – 12 CrMo 19 5 (1.7353, 1.7363)
Forgings A 336 Cl, F5.

A hydrogen controlled basic coated iron powder type electrode designed for welding creep resisting steels and heat treatable steels. The weld deposit is of 9 Cr-1 Mo steel type.

APPLICATIONS :

The 9Cr-1Mo steel deposit is suitable for elevated temperature service upto 600oC. It displays good corrosion resistance in superheated steam, hot hydrogen gas & high sulphur crude oil. Hence, it is recommended for use in boiler, super-heater tubing, heat exchanger, piping & pressure vessels in oil refineries & power plants.

GENERAL CHARACTERISTICS:

It represents a unique combination of numerous features which every welder and welding engineer look for on shop floor and at erection site.

  •  Ease of operation in all positions.
  •  Smooth & stable arc which is easy to strike and restrike.
  •  Slag detachability with little effort
  •  Finely rippled bead with regular profile.
  •  Welds of consistent X-ray quality.
  •  A higher level of metal recover at 100- 110%.

CHEMICAL ANALYSIS OF ALL WELD DEPOSIT (%)
C Mn Si S P Cr Mo Ni
0.050-0.10 0.50-1.0 0.80 max 0.025 max 0.025 max 8.0-10.0 0.90-1.20 0.40 max

ALL WELD MECHANICAL PROPERTIES: (After PWHT as per SFA 5.5)
Ultimate Tensile Strength (MPa) 0.2% Proof stress (MPa) Elongation (L = 4d)%
550 min 460 min 20-26

Hydrogen in weld metal : 4 ml/100g.max
(Mercury method)
Moisture content < 0.20%


WELDING CURRENT RANGES & PACKING DATA FOR SIZES MANUFACTURED :Use DC+ or AC (70V Min)
Dia (mm) 2.50 3.15 4.00 5.00
Length (mm) 350 450 450 450
Current (Amp) 70-100 100-140 140-180 180-240
NOTE ON USAGE :
  •   Redrying cycle:
    (a) 250oC/1-2 hr to control hydrogen below 10ml/100gm
    (b) 325oC/1-2 hr to control hydrogen below 5ml / 100gm.
  •   Avoid overdrying so as to prevent damage to coating. Restrict redrying to two cycles by using holding oven & quivers with temperature of 80-100oC.
  •   For detailed information on storage & redrying, please refer to our Notes on L.H. Electrodes (copy available on request).
  •   Use short arc & minimize weaving to the extent possible.
  •   Due attention has to be given to preheat & interpass temperature to ensure crack free welds & control on hardness of weld deposit & HAZ.
  •  Preheat – Interpass temperature range 200o-300oC depending on thickness.
  •  In welding thick sections (over 25mm), it is safe practice to maintain temperature of 200oC – 250oC for 1-2 hours after completion of welding. This facilitates reduction in hydrogen level to prevent hydrogen cracking, especially in highly restrained joints.
  •  As per SFA 5.5 – 2015
    Preheat & Interpass : 180o – 230oC
    PWHT : 740oC + 15oC for one hour.

Plates ASTM A 335 Gr. P9
Tubes A199 Gr. T9 A 200 Gr. T9, A 213 Gr. T9
CrMo 9 1, X 7 CrMo 9 1
Castings ASTM A 217 C12
DIN G-X – 12 CrMo 10 1 (1.7389)
Forgings ASTM A 336 Grade F9
  •  Hydrogen controlled basic coated electrode.
  •  Designed for welding 9Cr-1Mo steels modified with small additions of niobium, vanadium & nitrogen to derive better long term creep properties.Controlled addition of nickel is meant to impart better toughness after PWHT.
  •  Increasingly required in power generating plants, for headers, piping, turbine rotors.
  •  Use of 9Cr-1Mo modified steels is being progressively extended to other fields involving high temperature processes.

MATERIALS TO BE WELDED
Astm Din
A 213 T91 1.4903 (X10CrMoVNb91)
A335 P91 1.4903 (X10CrMoVNb91)
A 387 Gr.91 1.4903 (X10CrMoVNb91)
A 182 F91 1.4903 (X10CrMoVNb91)
CHEMICAL ANALYSIS OF ALL WELD DEPOSIT (%)
C Mn Si Cr Mo Ni V Nb Cu N S P
0.08-0.12 0.6-1.20 0.30 max 8.0-10.0 0.90-1.20 0.30 max 0.15-0.30 0.04-0.08 0.15 max 0.03-0.07 0.01 max 0.010 max

(Mn + Ni < 1.20%)


ALL WELD MECHANICAL PROPERTIES: (As PHWT 760oC + 15oC / two hours)
Ultimate Tensile Strength (MPa) 0.2% Proof stress Elongation (L = 4d) CVN Impact Values (Joules)
630 MPa Min 530 MPa min 17% Min (At +20oC) 35-55
(At 0oC) 30-40

Hydrogen in weld metal : 4ml max / 100g. (Mercury method).


HOT TENSILE TEST (At 600oC) Typical values.

UTS : 540 MPa

YS : 490 MPa


CREEP RUPTURE TEST:

Tested for 2000 hours at 600oC at stress of 180 MPa without rupture.

WELDING CURRENT RANGES & PACKING DATA FOR SIZES MANUFACTURED :Use DC+ or AC (70V Min)
Dia (mm) 2.50 3.15 4.00 5.00
Length (mm) 350 450 450 450
Current (amp) DC+ or AC 90V 70-100 100-140 140-180 180-240

NOTES ON USAGE:
  •  Ensure due control on hydrogen through adequate redrying for minimum one hour and preferably two hours.
  •  As is known, hydrogen levels will drop as the redrying temperature is raised. Thus, 300oC for hydrogen < 10ml/100g 350oC for hydrogen < 5ml/100g 400oC for hydrogen < 4ml/100g. Thereafter keep the electrodes in holding oven or quivers at 100oC.
  •  Preheat & interpass temperature 200o-350oC depending upon section thickness and restraint.
  •  On completion of welding, maintain temperature of 200oC-250oC for 1-2 hours depending on thickness, for the purpose of dehydrogenation, i.e., to permit hydrogen to escape and thereby to prevent cold cracking or delayed cracking due to hydrogen.
  •  Thereafter cool slowly to 90o or even lower & hold it for two hours, before commencing PWHT. This is necessary to ensure formation of martensite to be completed so as to confer the high creep strength expected of weldment.
  •  In PWHT, ensure uniformity of heat, tight control on temperature in a narrower range of 760oC + 5oC as PWHT is of the utmost importance in achieving the desired combination of strength, ductility, toughness, with controlled hardness of weld metal & HAZ.
  •  Importance of (Mn +Ni):
    In view of its profound effect on lower transformation temperature (AC1), due attention is being given to the total %age of (Mn+Ni). This level was accepted for several years at 1.5% (also included in SFA 5.5 – 2006 and now reduced to 1.4% in SFA 5.5-2014). It is now being lowered, based on practical experience with hardness control and requisite PWHT (Temperature – Time cycle). Many leading manufacturers of high pressure boilers specify the limit at 1.2% . All our batches meet this requirement. And now the foundry industry has started stipulating the limit at 1.0% Max in line with the relevant ASM standard A 217-2011. The temperature range for PWHT stipulated in ASTM A 217 – 2011, is 730oC – 800oC. We manufacture and supply batches to meet this revised limit of 1.0% max adopted by numerous foundry units.

Hydrogen controlled iron powder type electrode designed for welding creep resisting steels & cast steels of 2 ¼ Cr-1% Mo class. Weld metal displays resistance to elevated temperatures up to 600oC & resistance to hydrogen attack.


APPLICATIONS:

The 2.25 Cr-1Mo steel weld deposit can withstand prolonged elevated temperature service upto 600oC. Hence it is suitable for steam generating power plant – boiler superheat tubes & steam pipes, turbine castings, valve bodies, steam chests. Good corrosion resistance to sulphur-bearing crude oil upto 450oC, renders it suitable in refinery service. Also used in chemical & petrochemical industries, for hydrocracker, coal liquefaction plant.


GENERAL CHARACTERISTICS:

E9018-B3 welding electrodes represents a unique combination of numerous features which every welder and welding engineer look for on sop floor and at erection site.

  •  Ease of operation in all positions.
  •  Smooth & stable arc which is easy to strike and restrike, combined with low spatter and with due control on molten pool.
  •  Slag detachability with little effort
  •  Finely rippled bead with regular profile.
  •  Welds of consistent X-ray quality.
  •  Low level of diffusible hydrogen

CHEMICAL ANALYSIS OF ALL WELD DEPOSIT (%)
C Mn Si Cr Mo S P
0.05-0.12 0.50-0.90 0.50 max 2.0-2.5 0.90-1.20 0.025 max 0.025 max

ALL WELD MECHANICAL PROPERTIES: (After PWHT as per SFA 5.5)
Ultimate Tensile Strength (MPa) 0.2% Proof stress Elongation (L = 4d) CVN Impact Values (Joules)
630 min 530 min 20-25 >47

Hydrogen in weld metal : 4ml max / 100g.
(Mercury method)
Moisture content < 0.20%.


WELDING CURRENT RANGES & PACKING DATA FOR SIZES MANUFACTURED :Use DC+ or AC (70V Min)
Dia (mm) 2.50 3.15 4.00 5.00
Length (mm) 350 450 450 450
Current (amp) 70-100 100-140 140-180 180-240

Additional Information:

1) Preheat & Intrapass Temperatures:
There are differences in national codes. Thus,
AWS : 160o – 190oC,
BS : 200o – 300oC
DIN : 200o – 300oC.

2) PWHT as per SFA 5.5 – 2007,
6900 + 15oC for one hour.


NOTES ON USAGE:
  •   Redrying cycle:
    (a) 250oC/1-2 hr to control hydrogen below 10ml/100gm
    (b) 325oC/1-2 hr to control hydrogen below 5ml / 100gm.
  •   Avoid overdrying so as to prevent damage to coating. Restrict redrying to two cycles by using holding oven & quivers with temperature of 80-100oC.
  •   For detailed information on storage & redrying, please refer to our Notes on L.H. Electrodes (copy available on request).
  •   Use short arc & minimize weaving to the extent possible.
  •   Due attention has to be given to preheat & interpass temperature to ensure crack free welds & control on hardness of weld deposit & HAZ.
  •   Preheat – Interpass temperature range 200o-300oC depending on thickness.
  •   In welding thick sections (over 25mm), it is safe practice to maintain temperature of 200oC – 250oC for 1-2 hours after completion of welding. This facilitates reduction in hydrogen level to prevent hydrogen level.