Electrodes for Creep Resisting Steels

CROMOTHERME-92 H4R

AWS: SFA 5.5 E9015-B92

Cromotherme-92 H4R is moisture resistant hydrogen controlled basic coated non synthetic electrode deposits 9Cr - 1Mo and enriched with Niobium, Vanadium, Nitrogen and Tungsten. Tungsten additions provides adequate creep rupture strength at higher steam pressures and temperatures. The controlled addition of alloying elements improves the toughness and weldability. It is designed to weld advanced materials, which are being used to improve thermal efficiency in power plant, refineries etc. Ideal for welding steels of similar composition to achieve adequate creep rupture strength. Some typical materials that are welded with this consumable are A213 T92, A335 P92, A387 Gr92, etc.

Precaution

1. Re-dry the electrodes at 300 C for one hour, if expose to atmosphere.

2. Restrict the heat input, use short arc and stringer bead.

CHEMICAL COMPOSITION OF ALL WELD METAL (%)

Element	C	Mn	Si	S	P	Cr	Ni	Mo	W	V	Nb	B	Al	Cu	N
Percent	0.10	0.70	0.25	0.007	0.012	9.0	0.60	0.50	1.70	0.20	0.06	0.002	0.02	0.10	0.05

MECHANICAL PROPERTIES OF ALL WELD METAL

(PWHT : 760°C FOR 1 HR)

UTS	YS	Elongation	Hardness
(MPa)	(MPa)	(L= 4d)%	(BHW)
690	580	19	225

DIFFUSIBLE HYDROGEN CONTENT: 4 ml / 100 gms of weld metal Max

MOISTURE AS CONDITIONED: 0.15 Max

MOISTURE AS EXPOSED (80% RH, 27 C FOR 9 HRS): 0.40 MAX

ADVANTAGE: Electrodes are Vacuum packed, no need of drying and can be used straight on the job.

CURRENT AND PACKING DATA: DC (+)

Size (mm)	5x350	4x350	3.15x350	2.15x350
Current Range (Amps)	160-220	120-160	90-120	70-100
Qty. (Kgs./Carton)	2	2	2	2