Materials Selection Matrix for Winter Wear Parts

The material that lasts longest is not always the material that costs least per hour, and the material that costs least per hour is not always the one the workshop can fit. Winter wear parts are chosen against the combination, not against wear rate alone.

That is why a matrix is more useful than a ranking. What follows is the criteria set, the material families that answer it, and the way the two are combined into a decision.

What the selection actually turns on

The selection is made against the conditions the part will meet, and three of those conditions dominate.

The first is the surface: what the edge runs on decides whether the dominant mechanism is abrasion, gouging or impact. The second is speed, because contact pressure and local heating rise with it. The third is duty, meaning how many hours the machine runs and how often the part is changed.

Those three settle most of the decision, and the rest is constraint: what the workshop can fit, what the carrier can carry, and what the supply route can deliver inside the season. A material that wins on wear and loses on any of the constraints is not the answer.

Wear parts material selection: the criteria that decide

Selection follows the wear mechanism.

Surface, speed and duty decide whether the edge sees sliding abrasion, gouging or impact, and each of those points at a different material family with a different cost structure.

Working through the criteria in a fixed order keeps the decision auditable, which matters when the same fleet is specifying parts for a dozen machines of different ages and duties.

1. The surface and the dominant wear mechanism, taken from the worn parts rather than from a description.
2. The speed and the down pressure the machine runs at, which set the contact severity.
3. The duty cycle: hours per season, and how the part is changed out.
4. The fabrication constraint, whether the workshop cuts and welds or replaces parts.
5. The supply constraint, including lead time inside the season and available sizes.

The fourth and fifth items are constraints rather than preferences, and they belong in the same list because they can rule out the material that wins on the first three.

Carbon and alloy steels

Plain carbon and alloy steels are the baseline for wear parts, and they remain the right answer in more positions than the harder materials are.

They are available in the sizes and shapes a workshop needs, they weld and machine with ordinary equipment, and they can be bought as material rather than as finished parts. Their wear resistance is modest unless they are hardened, and they deform rather than fracture when they meet something solid, which is often the property that keeps a machine working.

Their place in the matrix is the general-purpose position: straight edges on moderate routes, structural parts of a wear assembly, and any location where the fleet needs to be able to rebuild the part locally.

Through-hardened and abrasion-resistant grades

Hardened and abrasion-resistant grades occupy the middle of the matrix, and they are where most of the cost-versus-life decisions actually happen.

A medium-carbon steel that has been hardened and tempered offers a substantial improvement in wear resistance over the baseline while remaining a steel that can be cut, drilled and welded with a procedure. Abrasion-resistant plate goes further, with a higher hardness across a broad surface, and is usually supplied as liner material rather than as a structural part.

The distinction that matters for selection is depth. A through-hardened section is hard all the way through and tolerates wear without losing its property; a surface-hardened one is hard only at the face and behaves like untreated steel once that layer is consumed. Which is appropriate depends on how much of the section the wear is expected to remove.

Cemented carbide inserts

Carbide is the hardest option in the matrix and the one with the narrowest good application.

It resists abrasion by a large margin over any steel, and it does so in a thin, concentrated layer that is attached to a steel body. That makes it efficient where the wear is concentrated along a contact line and uneconomic where it is spread over a large surface. Its impact tolerance is lower than steel’s, so the mounting and the grade together decide whether it survives the route.

Its place in the matrix is the high-abrasion, low-impact position: mainline plow edges on consistent surfaces, underbody blades, and any location where the changeout interval is long enough that the extra cost is repaid by the labour and downtime it saves.

Rubber-flex and composite options

Rubber-flex and composite edges answer a different problem, and they belong in the matrix as a separate row rather than as a variant of the steel options.

Their value is in conforming to an uneven surface, reducing noise and protecting the surface itself, which makes them suitable for applications where marking or damaging the pavement matters as much as clearing it. Their wear behaviour differs from a metal edge because the material flexes and returns rather than deforming permanently, and the bond between rubber and metal is the element that decides their life.

Their place in the matrix is where surface protection, noise or the risk of damage to the pavement outweighs the wear rate of a metal edge.

Matrix by surface, speed and duty

The matrix below places the families against the conditions they suit, and it is meant to be read from the left.

The first column is the condition, and it is taken from the machine rather than from a fleet average. Two trucks on the same contract can sit in different rows if one runs the mainline and the other clears shoulders.

The second row and the fourth row are the two that produce the most disappointed purchases, because they look similar on a parts list and are opposite in the matrix.

Cost implications of each choice

Each family carries its cost in a different place, and the comparison is only valid when all of them are counted.

Plain and hardened steels cost little per part and carry the cost of frequent changeouts. Carbide costs more per part and carries less changeout cost where it suits the application. Plate costs little per square metre and carries the cost of fabrication. Rubber-flex carries its cost in the bonding process and in the shorter intervals that some applications impose.

The practical way to compare them is per operating hour of the machine, including the labour and the downtime of a change. That figure makes the trade explicit and it usually separates the options clearly, because the changeout cost is the same regardless of which material caused it.

How to run the selection

The selection can be run in a workshop meeting, provided the inputs come from the machines rather than from the catalogue.

The sequence below produces a decision per position rather than per machine, which is the level at which winter equipment actually differs.

1. List the wear positions on the machine, one line each.
2. Record the surface each position works on and how often the part is changed.
3. Inspect a worn part and identify the mechanism from the surface pattern.
4. Place the position in the matrix and take the family it points to.
5. Check the constraints: fabrication, carrier load, lead time and available sizes.
6. Price the choice per operating hour, and record the decision for the next season.

The sixth step is what turns a one-off decision into a standard. Test and material standards that the specification can reference are published by ASTM International and the American Society of Mechanical Engineers, and the measurement practice behind a delivered part is published by the National Institute of Standards and Technology.

Fitment conventions that any of these choices still has to meet come from the American Association of State Highway and Transportation Officials and SAE International, and fleet practice in winter maintenance, including how programmes standardise across machines, is documented by the Snow and Ice Management Association. The blade and insert range SENTHAI supplies across these families is described on the carbide blade page.