Red Dog T137X

GENERAL DESCRIPTION

The T137X overlay alloy for steel plate has been developed for applications requiring good resistance against wear by abrasion combined with a higher level of impact resistance than that of T200X and T211X overlaid plates.

TYPICAL PROPERTIES OF UNDILUTED T137X ALLOY

The properties given directly below refer only to the T137X alloy, undiluted by base material (substrate).  These properties differ from the properties of actual overlay deposits on a particular substrate, examples of which are given in the next section.

Type of alloy	Iron based
Group of alloys	High chromium iron with added NbC
Nominal composition (undiluted)	3.8% C, 3.5% Mn, 22% Cr, 9% Nb, 0.5% V
Microstructure	Hypo-Eutectic with uniformly dispersed-fine Nb-carbides
Typical hardness range	47-52 Rc
Cracking	Yes
Abrasion resistance	Good
Impact resistance	Moderate to High
Typical service temperature	Up to 650°C (1,200°F)
Machining	Only grinding
Flame cutting	No

Standard Base Plate Grades

in the USA:	ASTM A-36
in the UK	BSEN 10025:1993 Fe 430A (BS 4260-43A)

Typical chemical compositions and hardnesses of single and double layer overlays:

	Element	C	Mn	Si	Cr	Nb	Fe	Hrc
Single Layer	Wt%	3.2	3.0	0.3	18.5	7.5	Remainder	47-50
Second layer	Wt%	3.4	3.0	0.4	20.0	8.0	Remainder	48-52

AREAS OF INDUSTRIAL USE

The T137X overlaid plates are used in many segments of industry:  Steelworks, Dredging, Mining, Refineries, Cement, Glass, Timber, Power Generation Plants, Earthmoving, Sugar Mills, etc., where a compromise between slightly reduced abrasion resistance but higher impact resistance than for T200X and/or T211X is required.

TYPICAL FIELDS OF APPLICATION

• Shovel bucket wear liners

• Chutes and decks of all types and sizes

• Vibratory feeders

• Crusher liners

• Auger flights, etc.

• Reclaimer buckets

• Ball mill liners

• Conveyer transfer points

• Dozer blades

• Truck bed liners.

MACHINING, CUTTING, WELDING AND REPAIR OF T137X PLATES

Edges and surfaces may be ground with an abrasive disk.

The high chromium content of the alloy is incompatible with the use of oxy-fuel flame cutting processes.

Plasma-arc is the generally preferred method of cutting.  The quality of plasma cutting is excellent, in terms both of precision and cleanliness.

Localized removal of the overlay material is possible using the Carbon-Arc/Air process.

T137X plates can be welded to themselves or to any weldable substrate structural material using mild steel low hydrogen welding consumables.

Structural welding must be carried out on the mild steel side of the plate.

Local repairs, or reconstruction of the overlay at the location of welded joints can be carried out using matching manual electrodes or corresponding tubular wires.

For more information please consult Red Dog's Fabrication Guide.

FURTHER SERVICES AVAILABLE FROM KUBES ALLOYS

Kubes Alloys' access to Red Dog's proprietary technology, technical knowledge and 50 years of experience as a leader in the field, provides the basis from which to select base plate qualities and overlay alloy properties to suit specific, non-standard requirements.  This service is available from Kubes Alloys which will be please to assist.

Kubes Alloys also has the specialized in-house capability of fabricating a wide range of components and structures, notably to ASME Code requirements, from overlaid plates.

TECHNICAL SUPPORT

Technical support and advice on all aspects of the selection and fabrication of Red Dog overlay plates may be obtained by contacting Kubes Alloys directly.