Products |

INDULAY is an internal chromium carbide weld overlay process designed to combat abrasion in piping systems used for the conveyance of bulk materials.

INDULAY is cost effective where there is severe pipe abrasion. Actual performance is dependent on the overlay thickness and the systems operating conditions. Field results have shown INDULAY to have a wear-life of 8 to 20 times that obtained from regular carbon steel.

INDULAY is a unique process which gives a smooth continuous overlay on a one piece pipe bend. It eliminates the need for bends of segmented construction. Integral tangents can be overlayed in the same continuous manner.

INDULAY can overlay pipe bends of any angle of any arc length. Minimum
pipe diameter is 3" (76.2mm), maximum 48" (1219mm).

INDULAY can be applied to straight pipe, tees and reducers. Minimum diameter 3" (76.2mm), maximum length 20ft (6m). Pipe bends and fabrications can be fitted with standard ASTM flanges and coupling rings (see sidebar illustrations).

The INDULAY welding process is open arc flux core. Overlay thickness is from 3/16" (5mm) to 9/16" (14mm). The overlay can be placed in areas of high wear to maximize life. Overlay options are shown on the left.

INDULAY has been developed to give maximum abrasion resistance through the chrome carbide layer. This has been achieved by the development of specialized welding techniques which give an even dispersion of carbides across the chrome carbide layer and then minimum of dilution between the steel pipe and the chrome carbide overlay (see below). Hardness across the undiluted carbide overlay is in the range of: 575 BHN (56 HRC) to 720 BHN (64 HRC).

INDULAY spools, if specified, can conform to ASME B31.3 and B31.11.

Figure 2. Enlargement of chrome carbide matrix showing even dispersion of carbides.

Figure 3. Photograph of chrome carbide overlay and steel pipe showing minimal weld dilution at the interface.

INDULAY Bend Repair
Worn Bends of fittings of weldable alloy can be patched when worn through and overlayed to bring them back to their original condition. Contact us to speak to a sales representative.


INDULAY Alloys
Type G – For severe abrasion moderate impact and temperatures up to 900°F (482°C)

Type H – For temperatures up to 1700°F (925°C) which is used in conjunction with a stainless steel backing pipe.

During the overlay welding process the residual stresses from thermal expansion and contraction are relieved by checking of the overlay deposit. This checking is confined to the hard surface deposit and does not extend into the pipe base metal. The check frequency is 2 to 4 per lineal inch.

Alloys for extreme service conditions can be applied to suit customer's requirements.

INDULAY WELD CHEMICAL COMPOSITION
	Type G	Type H
Carbon	6%–7%	1.5%–2.5%
Manganese	.75%–1.1%	1.2%–1.7%
Silicon	.1%–.35%	.75%–1.1%
Chrome	24%–27%	26%–29%
Iron	Balance	3%–5%
CO	–	Balance