DAIKOWT Mo.B

GTAW
  • CREEP RESISTING STEELS
0.5Mo

Description

Copper-coated rod for 0.5% Mo creep-resistant steels
Rod developed to ensure continuous service at high temperatures up to approximately 450°C, ideal for welding low-alloy and creep-resistant steels. Main applications include boilers, pressure vessels, tanks, piping, crane structures, and heavy metal structural work.
Specifications
EN ISO 21952-A
W MoSi
AWS A5.28
ER70S-A1
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)
2
Chem. Comp. %
DEFAULT
C
0.09
Mn
1.2
Ni
0.15
Cr
0.15
P
0.01
S
0.01
Mo
0.5
Si
0.6
Cu
0.25
Mechanical Properties
min
variant
Tensile strength Rm MPa
515
640
Yield strength Rp0.2 MPa
400
530
Elongation A (L0=5d0) %
19
26
Impact Charpy ISO-V
-
90J @ -20°C
Impact Charpy ISO-V
-
-
Welding Parameters
1.6 mm
2.4 mm
Ampere
95A - 135A
145A - 205A
Voltage
-
-
Packaging
Ø 1,2÷3,2mm
Ø 1,2÷3,2mm
Packaging Type
5kg carton tube
5kg carton tube
Description

Application

The alloy with a nominal 0.5% molybdenum offers a significant improvement in high-temperature performance compared to carbon-manganese steels (C-Mn). It is widely used in the
fabrication of vessels and
pipelines requiring resistance to creep rupture and ductility at temperatures up to about 450 °C. The molybdenum content also enhances resistance to hydrogen attack, making it ideal for use in chemical processing plants. The mechanical properties of the weld metal, both in the as-welded and stress-relieved conditions, are excellent for welding technical structural and general structural steels intended for ambient or sub-zero temperature service. Therefore, these consumables are closely related to high-strength manganese-molybdenum alloy steels. Preheat and interpass temperatures generally range from 100 °C to 250 °C, depending on the thickness of the material being welded and the degree of restraint. Post-weld heat treatment (PWHT) for tempering can vary depending on the applied code; extremes range from 550 °C to 720 °C, with the most common range being from 630 °C to 670 °C. For materials up to 20 mm thick, some codes allow omitting the PWHT.

Alloy Type

Ferritic creep resisting 0.5%Mo steels for elevated temperature service.

Microstructure

In the stress-relieved condition the microstructure consists of acicular ferrite with some tempered bainite.

Materials

  • EN W.Nr.: 10028-2 gr. 16Mo3 (1.5415), 16Mo5 (1.5423), 10MnMo 4 5 (1.5424), 11MnMo 4 5 (1.5425), GS-22Mo 4 (1.5419)
  • ASTM: A335 gr. P1, A209 & A 250 gr. T1, A336 gr. F1, A204 gr. A, B, C, A217 gr. WC1, A352 gr. LC1

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