DAIKOWS MnMo

SAW
  • HIGH YIELD STRENGTH STEELS
80-90ksi

Description

Low alloy solid wire for high yield strength steels
High strength low alloy submerged arc welding wire with improved elevated temperature performance over that of C-Mn steels. Used for the fabrication of vessel and associated pipework demanding creep rupture strength and ductility up to about 450°C. Good toughness at low temperatures.
Specifications
EN ISO 14171-A
S4Mo
AWS A5.23
EA3
Shielding
DAIKOFLUX 490-W, 491-W
Positions
PA, PB, PC
Current
DC/AC
Packaging Type
K415 spool and drums.
Asme qualifications
F-No (QW432)
6
A-No (QW442)
3
Chem. Comp. %
DEFAULT
C
0.07
Mn
1.6
Ni
0.06
Cr
0.08
P
0.01
S
0.01
Mo
0.4
Si
0.6
Cu
0.15
Mechanical Properties
min
variant
Tensile strength Rm MPa
-
640
Yield strength Rp0.2 MPa
-
510
Elongation A (L0=5d0) %
-
22
Impact Charpy ISO-V
-
70J @ -20°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.4 mm
3.2 mm
4 mm
Ampere
350A - 450A
430A - 530A
480A - 580A
Voltage
27V - 31V
27V - 31V
28V - 32V
Packaging
Ø 2,0÷4,0mm
Ø 2,0÷4,0mm
Ø 2,0÷4,0mm
Packaging Type
product.packaging_types.product.packaging_types.product.packaging_types.K415 spool and drums.
product.packaging_types.product.packaging_types.product.packaging_types.K415 spool and drums.
product.packaging_types.product.packaging_types.product.packaging_types.K415 spool and drums.
Description

Application

Low-alloy high-strength steels offer excellent performance at elevated temperatures compared to C-Mn steels, making them ideal for manufacturing pressure vessels and related piping. These materials provide significant resistance to creep rupture and maintain ductility up to about 450 °C, also exhibiting good toughness at low temperatures. They are perfect for the production of high-strength steels intended for use in stress-relief conditions. These consumables, characterized by a low nickel content, are specifically designed for the process piping and fittings of offshore oilwell head, conforming to the requirements of the NACE MR0175 standard. This ensures optimal resistance to sulfide stress cracking in sour environments, combined with good toughness even at subzero temperatures. They are also used for the repair of medium-strength low-alloy steel castings, where only stress-relieving treatment, instead of normalizing and tempering (N+T), needs to be applied. The precise requirements for preheating and post-weld heat treatment (PWHT) depend on the base material to be welded. Typically, preheat/interpass temperatures are between 100 and 250 °C. A PWHT is required.

Alloy Type

Low alloy steel consumables with MnMo additions for welding high strength steels with ultimate tensile strength to 620 MPa (90ksi).

Microstructure

In the stress relieved condition the microstructure consists of tempered bainite.

Materials

  • EN W.Nr.: P295 G H, P355 G H, 16Mo2, 17Mo3, 14Mo6, S275, S355, S420, S275, S355, S420
  • ASTM: A 487 Gr 2A, 2B & 2C

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