IDENTIFICATION
Griduct B2L, E 7018-B2L
CLASSIFICATION
AWS A5.5: E 7018 B2L IS 1395: E 55B- B2L26Fe
BS 2493 1Cr MoLBH DIN 8575-84 ECrMo1B20+
DESCRIPTION
A heavy coated, basic type, low hydrogen all-position, except vertical down, electrode, which deposits 1.25% Cr/ 0.5% Mo weld metal. The electrode is synthetic type and is intended for welding creep resisting steels of similar composition, used in power generating plant operating at temperatures upto 570°C. The welds are of X-ray quality.
WELD METAL ANALYSIS (RANGE) %
| C | Mn | Si | S | P | Cr | Mo | Sn |
| 0.050 max | 0.5 - 0.9 | 0.2 - 0.6 | 0.015 max | 0.012 max | 1.0 - 1.5 | 0.4 - 0.65 | 0.015 max |
MECHANICAL PROPERTIES (RANGE)
| UTS (MPa) | YS (MPa) | EL (%) (L=4D) | CVN Impact Value | |
| 530 - 650 | 425 - 580 | 19 - 26 | Temp | Joules |
| -20°C | 40 min | |||
TYPICAL APPLICATIONS
• ASTM A 335 grades P11 and P12 ASTM A 155 grades
½ C, 1 Cr, 1 ¼ Cr, A182F11, DIN 13 CrMo44,
GS-17CrMo55, BS 3604 grades 620 and 621.
• Ideal for welding Chromium-Molybdenum alloy steels (0.5 Cr-0.5 Mo, Icr-0.5 Mo, 1.25 Cr-0.5 Mo), boilers, pressure vessels, headers, high pressure piping, heat exchangers and condensers, power generation, oil refineries, petrochemical industries.
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 dry condition
ASME QUALIFICATION : QW–432 F.NO4, QW-442 A NO.4
RECOMMENDED REDRYING : 300°C / 2 hrs, (max 5 times, and total 10 hrs max)
MOISTURE IN THE FLUX COATING : 0.3% by weight, maximum
DIFFUSIBLE HYDROGEN CONTENT IN THE WELD METAL : Max 5 ml / 100g. of weld metal
RECOMMENDED PREHEATING & INTERPASS TEMPRATURE : 165°C-190°C
MICROSTRUCTURE : After PWHT, the microstructure consists of tempered bainite.
WELDING POSITION :
PACKING PARAMETERS
| Size (mm) | Length (mm) | Amps | Packing / Box (kg) | Packing / Box (Pcs) |
| AC (70V) / DC (+) | ||||
| 2.5 | 350 | 60 - 80 | 5 x 4 = 20 | 160 x 4 = 640 |
| 3.15 / 3.20 | 450 | 90 - 130 | 5 x 4 = 20 | 110 x 4 = 440 |
| 4 | 450 | 140 - 190 | 5 x 4 = 20 | 70 x 4 = 280 |
| 5 | 450 | 190 - 250 | 5 x 4 = 20 | 45 x 4 = 180 |