Metrode Consumables Catalog

METRODE PRODUCTS LTD
HANWORTH LANE, CHERTSEY
SURREY, KT16 9LL
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+44(0)1932 569449 Technical DATA SHEET E-68
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Email: info@metrode.com
Internet: http//www.metrode.com MAR 250
Solid TIG wire.
Product description
Specifications
No national specifications.
ASME IX Qualification
QW432 F-No --.
Materials to be welded
Matching base materials.
Surfacing of numerous ferrous base materials and
repair of tool steels.
Applications
As-deposited weld metal hardness allows easy
machining, with a hardness of ~500HV being achieved
following a low temperature PWHT of 450-480°C
(maraging). Dimensional changes during maraging are
minimal, allowing machining to nett size prior to
hardening. Nitriding and maraging can be carried out
simultaneously using gaseous ammonia, enabling
surface hardnesses of ~900HV to be obtained. Typical
repair applications include cutting tools, stamping
dies, die-casting moulds etc.
Microstructure
As-deposited: low carbon partially tempered
martensite. Following PWHT: tempered and agehardened
martensite with traces of austenite.
Welding guidelines
Preheat dependent on base material being welded.
PWHT, normally 450-480°C, required to achieve full
strength and hardness (for some applications maraging
can occur during service eg. moulds).
Composition (wire wt %)
C Mn Si S P Ni Co Mo Ti Al
min -- -- -- -- -- 17.0 7.0 4.0 0.2 --
max 0.03 1.0 0.5 0.02 0.03 20.0 9.0 5.5 0.6 0.2
typ 0.01 0.1 0.1 0.01 0.01 18 8 5 0.4 0.1
All-weld mechanical properties
As welded PWHT
Hardness HV 300-350 500-550
TIG
Shielding Ar
Current DC-
Diameter 2.4mm
Parameters 140A, 12V
ø mm TIG
2.4 2.5kg tube
Typical parameters
Packaging data
Storage
Recommended ambient storage conditions: < 60% RH,
>18°C.
Fume data
Fume composition, wt % typical (TIG fume negligible):
Fe Mn Cr Ni Co Mo OES (mg/m 3 )
30 1