G-TECH 35.45Nb

SMAW
  • HIGH TEMPERATURE ALLOYS
35.45

Description

Basic coated electrode
The weld deposit is high carbon 35Cr-45Ni-1Nb to match heat-resisting castings with great oxidation and carburization resistance for applications up to 1150°C. In the as-welded condition the multi-pass weld metal microstructure consists of austenite with primary eutectic and secondary precipitated carbides. For the thicker section materials a preheat may prove beneficial owing to the low ductility of the material. Typical applications include tubes for steam cracking pyrolysis transfer lines, pyrolysis furnace outlet lines and steam reformer headers in the petrochemical industry.
Specifications
EN ISO 3581-A
EZ 35 45 Nb B 32
Shielding
-
Positions
PA, PB, PC, PD, PE, PF
Current
DC+;
Packaging Type
Carton box

Pren

35.165
Chem. Comp. %
DEFAULT
C
0.45
Mn
0.9
Ni
46
Cr
35
Nb
0.9
Mo
0.05
Si
1.2
Ti
0.02
Mechanical Properties
min
variant
Tensile strength Rm MPa
-
760
Yield strength Rp0.2 MPa
-
540
Elongation A (L0=5d0) %
-
6
Impact Charpy ISO-V
-
-
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4 mm
Ampere
60A - 90A
80A - 110A
100A - 150A
Voltage
-
-
-
Packaging
55 pcs/kg
30 pcs/kg
19 pcs/kg
Packaging Type
Carton box
Carton box
Carton box
Description

Application

These alloys offer exceptional resistance to carburization and oxidation, surpassing alloys with a 25% Cr-35% Ni composition when used at temperatures up to 1150 °C. However, there is a slight decrease in creep resistance.
Main applications include use in pyrolysis coils and reformer tubes in the petrochemical industry. For significant thicknesses, preheating is recommended due to the material's low ductility. Generally, no post-weld heat treatment (PWHT) is required.

Alloy Type

High carbon 35Cr-45Ni-1Nb to match heat-resisting castings, which are often micro-alloyed with Ti and Zr.

Microstructure

In the as-welded condition the multi-pass weld metal microstructure consists of austenite with primary eutectic and secondary precipitated carbides.

Materials

  • PROPRIETARY: Paralloy H46M (Doncasters Paralloy), Manaurite® XT, XTM (Manoir Industries), Centralloy® ET45 Micro (Schmidt + Clemens), Lloyds T80, Lloyds T75MA (LBA), E3545Nb-MA (Engemasa)

Welding & PWHT

Queste leghe richiedono un controllo preciso dei parametri di saldatura per garantire cuciture di qualità. L'utilizzo di materiali di apporto appropriati e il mantenimento di un ambiente di lavoro pulito possono influenzare significativamente l'integrità della saldatura. È cruciale monitorare le temperature interpass e l'apporto di calore per mitigare potenziali problemi legati alla fessurazione a caldo e alla stabilità della microstruttura. In casi specifici, l'impiego di velocità di raffreddamento controllate e lente può migliorare le proprietà meccaniche finali delle saldature, proteggendo da distorsioni indesiderate e tensioni residue.

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