DAIKOWM 410NiMo

GMAW
  • FERRITIC - MARTENSITIC STAINLESS STEEL
410NiMo

Description

NiMo solid wire for 12% Cr martensitic stainless steels
Wire rod formulated for welding type 410NiMo martensitic stainless steels. 410NiMo is a high strength >760MPa martensitic stainless steel with better resistance to corrosion, hydro-cavitation, sulphide-induced SCC, and good sub-zero toughness compared to standard 410 steels. Weld metal of this type overmatches the strength of equivalent base material. The 410NiMo consumables are also used for overlaying mild and C-Mn steels. Applications include turbines, valve bodies, high pressure piping, offshore, power generation.
Specifications
EN ISO 14343-A
G 13 4
AWS A5.9
ER410NiMo
Shielding
M12, M13
Positions
PA, PB, PC, PD, PE, PF, PG
Current
DC+
Packaging Type
Drums, B300, D200 and D100 spools.
Asme qualifications
F-No (QW432)
6
A-No (QW442)
-

Pren

13.85

Hardness

300HV
Chem. Comp. %
DEFAULT
C
0.02
Mn
0.45
Ni
4.5
Cr
12.2
P
0.02
S
0.02
Mo
0.5
Si
0.35
Cu
0.01
Mechanical Properties
min
variant
Tensile strength Rm MPa
750
880
Yield strength Rp0.2 MPa
500
740
Elongation A (L0=5d0) %
15
20
Impact Charpy ISO-V
-
50J
Impact Charpy ISO-V
-
-
Welding Parameters
1 mm
1.2 mm
Ampere
160A - 220A
200A - 270A
Voltage
25V - 29V
26V - 30V
Packaging
Ø 0,8÷1,6mm
Ø 0,8÷1,6mm
Packaging Type
product.packaging_types.product.packaging_types.product.packaging_types.Fässer, B300-, D200- und D100-Spulen.
product.packaging_types.product.packaging_types.product.packaging_types.Fässer, B300-, D200- und D100-Spulen.
Anti-wear Characteristics
Adhesive wear
Abrasive wear
Impact
Corrosion
Heat
Description

Application

Martensitic stainless steel 410NiMo is known for its high strength (>760 MPa) and excellent corrosion resistance. It is distinguished by its resistance to hydro-cavitation, sulfide stress corrosion cracking, and remarkable toughness at low temperatures compared to unalloyed steels with 12% Cr, such as type 410/CA15. The filler metal of this type not only matches but exceeds the strength of the equivalent base material, offering extraordinary protection against failure during PWHT. These characteristics make 410NiMo ideal for welding precipitation-hardening martensitic alloys, provided that the corrosion resistance requirements are compatible with the use of filler metals with lower alloys, and allow for a single PWHT at 450-620 °C for tempering. 410NiMo consumables are also commonly used for cladding mild steels and C-Mn steels. The 13% Cr and 4% Ni alloys are used in cast or forged components, such as hydraulic turbines, valve bodies, pump casings, compressor cones, impellers, and high-pressure pipes used in power generation, as well as in offshore oil, chemical, and petrochemical industries.

Alloy Type

12%Cr-4.5%Ni-0.5%Mo (410NiMo) soft martensitic alloy.

Microstructure

In the PWHT condition the microstructure consists of tempered martensite with some retained austenite.

Materials

  • EN W.Nr.: 1.4313 (X3CrNiMo13-4)
  • ASTM: F6NM, CA6NM
  • ANFOR: Z6 CND 1304-M
  • UNS: S41500

Welding & PWHT

To optimize performance during welding, a preheat-interpass temperature range between 100 °C and 200 °C is recommended, promoting martensite transformation. It is advisable to cool to room temperature before PWHT. In sour oil conditions, for maximum resistance to sulfide stress corrosion SCC, NACE MR0175 specifies a hardness below 23 HRC. However, achieving this hardness is often challenging since the weld metal and HAZ are highly resistant to softening with PWHT. A double tempering for 5-10 hours is required. Common practices suggest treatment at 675 °C for 10 hours followed by 605 °C for another 10 hours, allowing intermediate air cooling to room temperature. Recent studies indicate that heat treatment at 650 °C followed by 620 °C is optimal and that intermediate air cooling to room temperature or lower is essential. Another entity recommends increasing the first PWHT cycle, including complete austenitization annealing at 770 °C for 2 hours before final tempering. In this situation, controlling distortion becomes more critical. In the case of Supercore 410NiMo Flux cored wire, reducing hardness to 23 HRC was impossible, regardless of the PWHT employed. When 410NiMo consumables are used for welding unalloyed martensitic stainless steels such as type 410 or CA15, the PWHT should not exceed 650 °C, except for a second tempering at 590-620 °C.

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