DAIKOWT 316MnNF

GTAW
  • AUSTENITIC STAINLESS STEELS
316NF

Description

Nil-ferrite modified 316L Solid rod for non-magnetic, cryogenic and nitric acid applications
Wire with a typical ferrite content of 0.5 FN maximum that provides a fully austenitic and non-magnetic weld deposit. The high level of Mn content ensures freedom from micro cracking and helps to stabilize the austenitic microstructure and aids in hot cracking resistance. Suitable for low temperature applications down to –269°C (e.g. LPG and LNG storage vessels) and where non-magnetic property is required. This filler metal also exhibits good corrosion resistance in acids and seawater, and is particularly suited for corrosion conditions found in urea synthesis plants.
Specifications
ISO 14343-A
W 20 16 3 M
AWS A5.9
ER316LMn
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)
-

Ferrite

<0,5 FN

Pren

32.3

Hardness

200HV - 220HV
Chem. Comp. %
DEFAULT
C
0.02
Mn
7
Ni
16
Cr
20
N
0.15
P
0.015
S
0.01
Mo
3
Si
0.5
Cu
0.15
Mechanical Properties
min
variant
Tensile strength Rm MPa
510
710
Yield strength Rp0.2 MPa
320
510
Elongation A (L0=5d0) %
25
30
Impact Charpy ISO-V
-
60J @ -196°C
Impact Charpy ISO-V
-
-
Welding Parameters
1.6 mm
2.4 mm
Ampere
80A - 100A
110A - 160A
Voltage
-
-
Packaging
Ø 1,0÷4,0 mm
Ø 1,0÷4,0 mm
Packaging Type
5kg carton tube
5kg carton tube
Description

Application

The elevated nickel and nitrogen levels yield a fully austenitic, non-magnetic weld deposit with a maximum magnetic permeability of 1.01 H/m. Controlled nitrogen levels contribute to achieving a typical tensile strength above 600MPa. The high manganese content ensures freedom from microfissuring in the ferrite-free weld metal. Applications that benefit from non-magnetic properties include welding 316L fittings for minesweepers and offshore downhole instrumentation collars. The fully austenitic microstructure provides excellent strength and toughness at cryogenic temperatures, suitable for joining 304L and 316L LPG and LNG storage vessels. Useful toughness is maintained down to liquid helium temperatures (-269°C) for superconducting applications. In contrast to conventional 316L weld metal containing ferrite, which is susceptible to preferential attack in concentrated nitric acid, the nil-ferrite alloy exhibits excellent resistance and is suitable for direct deposition onto CMn steel to provide corrosion-resistant overlays. No preheat is required, and the maximum interpass temperature is 150°C.

Alloy Type

Nil-ferrite, modified 316L alloy for non-magnetic, cryogenic and nitric acid applications.

Microstructure

Fully austenitic.

Materials

For type 316L and similar parent materials where ferrite-free and non-magnetic weld metal is required, also suitable for 304/304L and 316/316L for cryogenic service. May be suitable for welding 200 series stainless steels, and nitrogen strengthened stainless steels.
ASTM: XM-19.
UNS: S20910.
PROPRIETARY: Nitronic® 50 (AK Steel), Fermonic ® 50 (Langley Alloys).

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