DAIKOFCW 420

FCAW
  • FERRITIC - MARTENSITIC STAINLESS STEEL
420

Description

Martensitic flux cored wire for hardfacing
The weld metal is similar to 410 with higher chromium and carbon contents and is used for surfacing operation requiring corrosion resistance and wear resistance on matching base materials and also on CMn steels. Suitable for cladding of continuous casting rolls. It requires preheat and inter-pass temperatures of not less than 225ºC, followed by slow cooling. Post weld heat treatment is used to temper the weld deposit. The wire shows good wetting behaviour and a finely rippled surface pattern.
Specifications
ISO 14700
T Fe 8
Shielding
M21
Positions
PA, PB, PC
Current
DC+
Packaging Type
BS300 spool

Pren

13

Hardness

40HRC - 50HRC PWHT
Chem. Comp. %
DEFAULT
C
0.4
Mn
0.6
Ni
0.5
Cr
13
P
0.03
S
0.03
Si
0.5
Cu
0.3
Mechanical Properties
min
variant
Tensile strength Rm MPa
-
280
Yield strength Rp0.2 MPa
-
140
Elongation A (L0=5d0) %
-
20
Impact Charpy ISO-V
-
50J @ 20°C
Impact Charpy ISO-V
-
-
Welding Parameters
1.2 mm
1.6 mm
Ampere
120A - 290A
180A - 350A
Voltage
20V - 30V
30V - 34V
Packaging
Ø 1,2÷1,6mm
Ø 1,2÷1,6mm
Packaging Type
BS300 spool
BS300 spool
Anti-wear Characteristics
Adhesive wear
Abrasive wear
Impact
Corrosion
Heat
420
Description

Application

Sharing similarities with ER410, this alloy distinguishes itself through a slight increase in both chromium and carbon contents. Its utilization extends to a myriad of surfacing operations where a combination of corrosion resistance (attributed to its 12 percent chromium composition) and augmented hardness for heightened wear resistance is paramount. This alloy finds its primary application in surfacing the sealing faces of valves employed in gas, water, and steam piping systems, especially under service temperatures reaching up to +450 °C. Beyond this, its versatility encompasses various applications, including welding similar parental metal, weld overlay, thermal spraying, and the cladding of continuous casting rolls. Remarkably, if the envisaged application demands the use of parts in the "as-welded" condition, achieving a ductile joint is entirely feasible. This is achieved through the application of austenitic fillers, with options such as 22 12 L/309, 18 8 Mn/307, or 25 20/310 proving suitable for this purpose.

Alloy Type

Ferritic martensitic stainless steels.

Microstructure

The microstructure comprises tempered martensite and some carbide.

Materials

Corrosion resistant Cr-steels as well as other similar-alloyed steels with C-contents ≤ 0.30 % (repair welding), heat resistant Cr-steels of similar chemical composition.
EN W.Nr.: 1.4006 (X12Cr13), 1.4021 (X20Cr13), +
ASTM: 410, 420.

Welding & PWHT

Implementing pre-heating and meticulous interpass temperature control during welding, coupled with a deliberate and gradual cooling process followed by Post Weld Heat Treatment (PWHT), serves as effective preventive measures against cracking. For joint welding, a recommended preheating temperature of +200 – 300 °C is advisable, the specific value depending on the alloy type and strength levels. Correspondingly, the interpass temperature should be maintained within the same range. Ensuring an optimal heat input is crucial, avoiding extremes with a recommended range of 0.5 – 1.5 kJ/mm. The hardness of the deposit is contingent upon the degree of dilution with the base metal and its chemical composition. Generally observed is the correlation where higher degrees of dilution and higher C-content in the base metal result in increased deposit hardness. Post-weld heat treatment becomes a requisite to reinstate ductility to the weld zone. This involves tempering at temperatures ranging from +700 – 750 °C, a process aimed at enhancing the toughness of the welded structure. This comprehensive approach guarantees the mechanical integrity and performance of the welded joints.

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