DAIKOWT 420C

GTAW
  • FERRITIC - MARTENSITIC STAINLESS STEEL
420

Description

Martensitic hardfacing rod for 13% Cr stainless steels
Rod capable of depositing a weld metal similar to 420B, with higher carbon content for increased hardness at the expense of toughness. Designed for overlays that require resistance to both corrosion and wear on corresponding base materials and C-Mn steels. Ideal for overlays and coverings of continuous casting rollers. Its properties remain effective even at high operating temperatures.
Specifications
EN ISO 14343-B
SS420
AWS A5.9
ER420
Shielding
I1
Positions
PA, PB, PC, PD, PE, PF
Current
DC-
Packaging Type
5kg carton tube
Asme qualifications
F-No (QW432)
6
A-No (QW442)
6

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
450
750
Yield strength Rp0.2 MPa
250
500
Elongation A (L0=5d0) %
15
30
Impact Charpy ISO-V
-
50J @ 20°C
Impact Charpy ISO-V
-
-
Welding Parameters
1.6 mm
2.4 mm
Ampere
80A - 100A
110A - 160A
Voltage
-
-
Packaging
Ø 1,0÷4,0mm
Ø 1,0÷4,0mm
Packaging Type
5kg carton tube
5kg carton tube
Anti-wear Characteristics
Adhesive wear
Abrasive wear
Impact
Corrosion
Heat
420
Description

Application

This alloy is similar to ER410 but possesses a slightly higher chromium and carbon content. It is particularly used in overlay operations requiring corrosion resistance, due to the 12% chromium content, and offers increased hardness which enhances wear resistance. It is mainly employed in the creation of sealing surfaces for valves in pipeline systems used for gas, water, and steam, under service conditions up to +450 °C. Applications include the welding of similar base metals, overlays through welding and thermal spraying. It is also suitable for the coating of continuous casting rollers. If the parts are intended to remain in the as-welded condition, a ductile joint can be achieved by using austenitic consumables such as 22 12 L/309, 18 8 Mn/307 or 25 20/310.

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

Preheating and interpass temperature control during welding, followed by very slow cooling and post-weld heat treatment (PWHT), are crucial measures to prevent cracking. It is recommended to preheat the joints to a temperature between +200 and +300 °C, depending on the specific alloy and strength requirements. The interpass temperature should adhere to the same range. Heat input must be carefully controlled between 0.5 and 1.5 kJ/mm. The hardness of the deposit is influenced by the degree of dilution with the base metal and its chemical composition; in general, greater dilution and higher carbon content in the base metal result in a harder deposit. Post-weld heat treatment is essential for restoring ductility in the weld area, with tempering at +700 – 750 °C to improve toughness.

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