GRIDUCT B3L

IDENTIFICATION : GRIDUCT B3L E8018 B3L

CLASSIFICATION : AWS/SFA 5.5: E 8018 B3L, BS 2493:2Cr MoLBH, DIN 8575-84 ECrMo2B26

CHARACTERISTICS :

A basic coated low hydrogen electrode which deposits extra low carbon 2.25Cr%/1.0Mo% weld metal. It is intended for welding creep resisting steels of similar composition, used in power generating plant operating at temperatures upto 600°C.The welds are of X-ray quality.

TYPICAL APPLICATION:

ASTM A 335 grade P22 ASTM A199,A200 T3b,T4,T21, T22,A213 T22,A181 F22, boilers, pressure vessels, headers, high pressure piping, heat exchangers and condensers, power generation, oil refineries, petrochemical industries, valve bodies, superheaters hydrocrackers, coal liquification plant.

WELDING PROCEDURE : Use short arc length.Weaving of electrodes ,if necessary should be done at slow speed and keeping a short arc.The electrodes should be used in perfectly dried condition.

ASMEQUALIFICATION : QW –432 F.NO4, QW-442 A NO.4

RECOMMENDED REDRYING : 300°C/2 hrs, 5 times, total 10 hrs max.

DIFFUSIBLE HYDROGEN CONTENT IN THE WELD METAL : Max 5 ml/100g.of weld metal

MICROSTRUCTURE : After PWHT, the microstructure consists of tempered bainite.

WELD METAL ANALYSIS (RANGE) %:

C Mn Si S P Cr Mo
0.050 max 0.5-0.9 0.2-0.6 0.025 max 0.03 max 2.0-2.50 0.90-1.20

MECHANICAL PROPERTIES OF THE WELD METAL AFTER PWHT 690°C/1 HR :

Ultimate Tensile Strength MPa Yield Stress MPa Elongation (%) (L=4D) Charpy Vnotch Impact Value Joules
550-650 460-580 17-25 Temp Joules.
0°C 30-90

RECOMMENDED CURRENT AND PACKING DATA :

SIZE mm LENGTH mm AMPS AC(70V) DC(+) Packing per box WEIGHT 1000Pcs,kg
2.5 350 60-80 160x4=640 18.9
3.15 450 90-130 110x4=440 41.6
4.0 450 140-190 70x4=280 67.2
5.0 450 190-250 45x4=180 100.0