A SUPER DUPLEX STAINLESS STEEL ELECTRODE FOR WELDING ALLOYS OF SIMILAR COMPOSITION
IDENTIFICATION
GRIBINOX 25.9.4 L E 25.9.4-15
CLASSIFICATION
AWS/SFA 5.4: E2594-15 EN 1600 : E2594 NLR
DESCRIPTION
Low hydrogen basic coated electrode manufactured by using Duplex grade of Stainless Steel core wire. Deposited welds are of radiographic quality. The electrode can be used in all position except verticle down, specifically well suited for pipe-joint. Gribinox 25.9.4L electrode is designed to match similar alloys. The electrode gives matching strength and corrosion resistance in the solution treated condition but can also be used in the as-welded condition. Nitrogen and nickel contents are controlled to give a balanced duplex structure to minimize the risk of cracking, particularly in highly restrained welds.
WELD METAL ANALYSIS (RANGE) %
| C | Cr | Ni | Mn | Si | S | P | Mo | Cu | N |
| 0.04 max | 24.0 - 27.0 | 8.0 - 10.5 | 0.5 - 2.0 | 1.0 max | 0.03 max | 0.04 max | 3.5 - 4.5 | 0.75 max | 0.20 - 0.30 |
MECHANICAL PROPERTIES (RANGE)
| UTS (MPa) | EL (%) (L=4D) | CVN Impact Value | |
| Temp | Joules | ||
| 760 min | 15 min | 20oC | 45 - 80 |
TYPICAL APPLICATIONS
Pumps and valves, corrosion / wear resisting parts and process equipment for use in offshore oil and gas industries, pulp, paper and textile industries, and chemical and petrochemical plant.
MATERIALS TO BE WELDED
• SAF 2507, ASTM S-32750, S-32760
• ASTM A351, A744 (cast) - CD4MCu, UNS J93370.
• ASTM A240 (wrought) - UNS S32550
• BS 3146 - ANC 21, BS 3100 332C13
• DIN 1.4515, 1.4517
• Steel EN 1.4410, NF 23CND 25-06AZ, SS2328
MICROSTRUCTURE : In the solution treated condition the microstructure is duplex with about 30-60% ferrite dependent upon dilution
INTERPASS TEMPERATURE : 100°C max
HEAT IN-PUT : 1.0 - 1.5 kJ / mm
SCALING TEMPERATURE : Approx 850°C (air)
CORROSION TEMPERATURE : Very good resistance to pitting and stress corrosion cracking in Chloride containing environments. Pitting resistance in accordance with ASTM G-48A better than 40°C.
WELDING POSITION :
PACKING PARAMETERS
| Size (mm) | Length (mm) | Amps | Packing / Box (kg) | Packing / Box (Pcs) |
| AC (OCV:70V) / DC (+) | ||||
| 2.5 | 350 | 60 – 90 | 2 x 5 = 10 | 94 x 5 = 470 |
| 3.15 / 3.20 | 350 | 70 – 120 | 2 x 5 = 10 | 60 x 5 = 300 |
| 4 | 350 | 100 - 155 | 2 x 5 = 10 | 38 x 5 = 190 |
| 5 | 350 | 130 - 180 | 2 x 5 = 10 | 24 x 5 = 120 |