G-TECH 308LCF-B

SMAW
  • AUSTENITIC STAINLESS STEELS
308LCF

Description

Controlled ferrite basic coated electrode for 304L base materials used in cryogenic applications
Its basic coating ensures excellent positional welding characteristics with good gap bridging ability. The weld pool and slag are easy to control and facilitate the achievement of a clean bead surface even in narrow preparations and in root pass. Ease of slag removal reduces post-welding cleaning operations to a minimum. These electrodes are used to weld 18Cr/8Ni stainless steels used in cryogenic applications (down to -196°C)and have a controlled ferrite (3÷8). Mainly applications include pipework and vessel for cryogenic service.
Specifications
EN ISO 3581-A
E 19 9 L B 4 2
AWS A5.4
E308L-15
Shielding
-
Positions
PA, PB, PC, PD, PE, PF
Current
DC+;
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
5
A-No (QW442)
8

Ferrite

3-8 FN

Pren

29.54

Hardness

76HRB
Chem. Comp. %
DEFAULT
C
0.03
Mn
1.2
Ni
10
Cr
18.5
N
0.69
P
0.015
S
0.02
Si
0.3
Mechanical Properties
min
variant
Tensile strength Rm MPa
510
600
Yield strength Rp0.2 MPa
320
460
Elongation A (L0=5d0) %
30
32
Impact Charpy ISO-V
-
43J @ -196°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4 mm
5 mm
Ampere
50A - 75A
80A - 110A
110A - 150A
160A - 210A
Voltage
-
-
-
-
Packaging
56 pcs/kg
28 pcs/kg
19 pcs/kg
12 pcs/kg
Packaging Type
Carton box
Carton box
Carton box
Carton box
Description

Application

The 308LCF product is used for welding austenitic stainless steels 18\/8, with operational service temperatures down to -196 °C. The components, including controlled ferrite electrodes for SMAW (Shielded Metal Arc Welding) and flux-cored wires, are specifically designed for cryogenic applications. Major applications include the welding of pipelines and tanks intended for cryogenic service, as in the case of liquefied natural gas (LNG). Preheating is not necessary, and the maximum allowable interpass temperature is 250 °C, while a temperature of 300 °C may be acceptable for thicker section materials. No post-weld heat treatment (PWHT) is required. To achieve optimal impact properties, it is recommended to operate at the upper extremes of the allowable heat input ranges.

Alloy Type

Controlled ferrite 308L austenitic stainless steels for joining 304L base materials used in cryogenic applications.

Microstructure

Austenite with a controlled level of ferrite, 2-5FN (3-8FN for solid wires).

Materials

  • EN W.Nr.: 1.4306 (X2CrNi19-11), 1.4301 (X5CrNi18-10), 1.4311 (X2CrNiN18-10), 1.4308 (X5CrNi19-10), 1.4307 (X2CrNi18-9 )
  • ASTM: 304L, 304, 304LN, CF3, CF8
  • UNS: S30403, S30400, S30453

Welding & PWHT

A translation for a welding-related description

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