High strength low alloy steels with improved
elevated temperature performance
over that of CMn 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. Fabrication of higher strength steels for use in the
stress relieved condition.
For **offshore oil well-head process pipework and
fittings**, these low nickel consumables satisfy NACE
MR0175 requirements intended to ensure resistance
to sulphide-induced stress corrosion cracking in sour
service, combined with good sub-zero toughness.
Also finds applications for the repair of medium
strength low alloy steel castings where a stress relief
only (rather than N+T) is to be applied. The actual preheat and PWHT requirements
will depend on the base material being welded.
Normally preheat/interpass temperatures will be
in the range 100-250°C. PWHT required.
Low alloy steel consumables with MnMo additions
for welding high strength steels with ultimate tensile strength to 620 MPa (90ksi).
In the stress relieved condition the microstructure
consists of tempered bainite.
Materials to be welded
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.