WEAR PIPE

TWP71

TWP71 is a patented iron based steel overlay wear solution with a near nanoscale (submicron) microstructure. TWP71 is well suited for the toughest jobs in the most extreme service environments.

TWP71w is a multicomponent steel alloy with a unique uniform glass-forming melt chemistry that allows high undercooling to be achieved during welding.

This results in considerable refinement of the crystalline microstructure down to a near nanosize (submicron) range. Unlike conventional weld overlay materials which are macrocomposites containing hard particles and general carbides in a distinct hard particles in a binder and is a uniformly hard matrix when welded.

This allows TWP71 to provide vastly improved hardness macrocomposites. Additionally, TWP71 is an iron-based alloy without tungsten carbide particulates.

KEY PERFORMANCE

CHARACTERISTICS

Applications

TWP71 can be applied to carbon steel, manganese base materials and mild or alloys steels including casing pipe.

High Hardness

TWP71 maintains maximum hardness performance of 68-71 HRc from the weld interface throughout the entire overlay in single pass applications.

This allows the overlay to be fully protective throughout the volume. The micrograph shows how 68-71 HRc maximum hardness is achieved within several microns of the weld overlay interface.

HRc hardness values in the micrograph were measured from a single pass TWP71 overlay applied to 44W/300W mild steel pipe and casing.

High Wear Resistance

TWP71 provides exceptional resistance to severe sliding abrasion in extreme service environments.

TWP71 can be built up to 1/4” overlay thickness in two passes as necessary with all layers providing maximum wear resistance of 0.08 – 0.10 g (+/- 0.03) mass loss in ASTM G65-04 abrasion test.

Damage Tolerance

The superior toughness of TWP71 results from the in-weld formation of a large quantity of refined complex borocarbide phases which are surrounded by ductile ferrite phases.

The borocarbide phases are completely wetted by the matrix and prevent premature pull-out, delamination and crack nucleation. Their refined nature allows the reduction of stress concentration sites and the ductile matrix supplies effective crack blunting and bridging, resulting in improved impact resistance.

Application Process

Open Arc Welding

Weld Deposit Properties

Density (g/cm³) 7.36

Impact Resistance

Drop Impact Passed multiple
Testing impacts at 165 ft-lbs

Rockwell C (HRc) Hardness

HRc 68- 71

Wear Resistance

ASTM G65-04 Procedure A 6,000 cycles mass loss 0.08g (+/- 0.02)

Packaging - Wire

.045” (1.1 mm) 15kg spools
1/16” (1.6 mm) 25kg spools
3/32” (2.4 mm) 25kg spools
7/64” (2.8 mm) 25kg spools