Vecalloy Readable is the only Fe-based twin wire arc spray which is readable as-sprayed state and after exposure to high tempera-tures. ‘Readability indicates that the thickness of Vecalloy Readable can be read accurately with an Elcometer or similar thickness gauge. In addition to the inherent ‘readability’, Vecalloy Readable coatings form a hard wear resistant layer. The high wear re-sistance coupled with the coating remaining ‘readable’ after exposure to high temperatures make Vecalloy Readable the perfect coating for power generation applications such as the coating of boiler tubes.

DESIGN APPROACH

The design process for Vecalloy Readable involves a proprietary high throughput computational metallurgical process to evaluate millions of candidate alloy compositions. Potential candidates are evaluated using advanced screening processes where both properties and microstructure are measured.

This innovative process allows us to rapidly design the final material with impeccable accuracy—a much more advanced approach than conventional experiment-based methodologies.

Vecalloy R

Technical Datasheet

PRODUCT OVERVIEW

Vecalloy Readable possess several unique properties which make it highly effective in boiler coatings:

1) It is an Fe-based alloy which can be effectively and consistently delivered via the twin wire arc spray process.

2) The material remains readable after exposure to high temperatures.

3) The alloy forms a hard wear resistant coating.

Until now, readable coatings were:

1) Limited to processes which are less effective at spraying large areas such as HVOF

2) Utilizing high cost raw materials such as Ni-based alloys.

Vecalloy Readable enables the twin wire arc spray technology to deliver high quality, high performance readable coatings.

VECALLOY READABLE CHEMISTRY AND PERFORMANCE Material Chemistry (wt%)

Properties

ASTM G65B 0.5 grams lost (dry sand abrasion)

ASTM G77: 0.16 mm3 lost (metal to metal sliding wear)

Vickers Hardness: ~ 500 (= 50 HRC)

Adhesion Strength: 8,000 psi

Maximum Thickness: 50-60 mils

Deposition Efficiency: >70%

Fe Mn Nb W Other Cr

BAL <15 <10 <10 <5 <15

10073 Commerce Park Drive. Cincinnati, OH 45246 / Phone: 513-847-3586 / Fax: 513-847-2880

E-Mail: sales@polymet.us

Vecalloy Reabale At 400X

Vecalloy R

Technical Datasheet

R

0-1 Micrometer Reading

Using Average 18 mils

Min 17.4 mils

Max 19.3 mils

Standard Deviation 0.90 mils

Elcometer Reading

As Sprayed After 700oC Exposure

17.5 mils 19 mils

16.2 17.8

19.5 21.4

1.20 mils 0.97 mils

10073 Commerce Park Drive. Cincinnati, OH 45246 / Phone: 513-847-3586 / Fax: 513-847-2880

E-Mail: sales@polymet.us

DETERMINING READABILITY

Vecalloy Readable has been verified as ‘readable’ in the as-sprayed and heat treated condition. It is always recommended that

the thickness gauge be calibrated to read Vecalloy Readable. The best method to achieve this task is to spray 1/2 of a flat test

coupon so that the elcometer readings can be calibrated to readings with a 0-1 micrometer. Readability testing by us has been

tested in this way using 10 consecutive readings with as-sprayed coatings and coatings exposed to 700oC for 4 hours. This testing

shows that the thickness of Vecalloy Readable coatings can be measured accurately with a elcometer or similar thickness gauge.

VECALLOY READABLE SPRAY PARAMETERS (Using TAFA 8830/8835)*

Parameters available upon request for other TWAS, HVAS, or HVCC systems. * The parameters below are a starting point. Always

observe industry standard safety procedures and equipment with approved eye, ear and respiratory protection in place. Read

and understand MSDS. Do not operate equipment in a manner not approved by manufacturer.

Atomizing Air Pressure 85 psi

Nozzle Cap Green

Nozzle Positioner Short Cross

Arc Load, Voltage 29-32

Current, Amps 175-250

Standoff, Inches 6”

Coating Thickness per Pass 2-3

Spray Rate (lbs/hr) 25

Spray Rate, lbs/hr/100 amps 10

Coverage 0.8 oz/ft2/0.001”

Expected Hardness (Vickers) 500 average

Expected ASTM G65B mass loss 0.5 g