Cost

Thermal Spray and Hardfacing Cost Estimation: Building a Defensible Quote

A cost breakdown of coated part pricing: where feedstock, masking, booth time, and rework dollars actually go, and the estimating mistakes that quietly erase margin.

On a typical HVOF carbide job, feedstock, labor, booth time, and finishing split roughly into four buckets, and the mix surprises people who think powder dominates. For a batch of pump sleeves, feedstock might be 30 to 40 percent of cost, masking and prep labor 20 to 30 percent, booth and robot time 15 to 25 percent, and finish grinding plus inspection and rework the balance. Premium powders like WC-Co at 80 to 120 dollars per kg or MCrAlY near 150 dollars per kg push the feedstock share up, but on multi-feature parts, masking labor frequently rivals it. Quote from the full route, not just the deposition step the spec sheet emphasizes.

Feedstock cost is deposited mass divided by deposit efficiency, times price per kg, so efficiency is the lever that quietly makes or breaks a quote. A part needing 211 grams deposited at 55 percent efficiency consumes 384 grams; at 45 percent it consumes 469 grams, a 22 percent feedstock jump from a ten-point efficiency miss. If you quote at datasheet efficiency and the booth runs ten points below, that gap comes straight out of margin on every part. Run the Powder Consumption or Wire Consumption calculator at your logged efficiency, not the supplier number, and add Bond Coat Usage separately since the tie layer is easy to omit from a quote.

Masking is the most under-estimated line in coating quotes and the one that most often turns a job unprofitable. On precision plasma and HVOF parts with bores, threads, keyways, and sealing faces, masking runs 15 to 40 percent of cell labor. At a loaded rate of 45 dollars per masked part on a 100-part batch with heavy coverage, that is 3,600 dollars of labor plus setup before the gun even fires. The Masking Labor Cost calculator prices this per part and lets you spread a one-time fixture setup, say 250 dollars, across the batch. On a 10-part order that setup adds 25 dollars per part; on 500 parts it adds 50 cents.

Booth and robot time is an hourly burden, not a material cost, and it is where over-promising the schedule burns money. Fully burdened spray cell rates commonly land between 120 and 250 dollars per hour once you load robot, gas, ventilation, and operator. If Spray Time Per Part returns 5.4 minutes per sleeve, that is 0.09 hours, or roughly 11 to 22 dollars of booth time per part before prep and finishing. Quote the adjusted time that includes the non-productive allowance, because scheduling to bare deposition time overloads the booth and forces overtime or missed dates that never appear in the original estimate.

Grind allowance is a hidden double cost: you pay to deposit stock you will grind away, then pay again to remove it. Spraying 0.33 mm to finish at 0.25 mm means 24 percent of that carbide is destined for the grinding wheel, and carbide grinding is slow and consumes diamond wheels. A blanket 0.10 mm allowance on parts that only need 0.05 mm inflates both feedstock and finish labor across the whole batch. Tighten the allowance per feature using Coating Thickness Buildup, and price finish grinding as its own labor line rather than burying it in a vague coating rate.

Scrap and rework carry the full sunk cost of every prior operation, which is what makes coating rejects so expensive. A sleeve that fails adhesion after spraying has already absorbed powder, gas, masking, booth time, and often grinding, so a reject at final inspection can cost two to three times the raw material. At a 4 percent reject rate on a 250-part batch, that is 10 parts carrying full cost plus strip-and-recoat labor. The Rework Cost calculator turns your reject rate into dollars so you can load a realistic scrap allowance into the quote instead of discovering it in the month-end variance.

Overhead and booth utilization decide whether your hourly rate is even real. If the burdened cell rate assumes 75 percent utilization but the booth actually runs 55 percent because of prep bottlenecks and changeovers, your true cost per productive hour is higher than quoted. The Booth Utilization calculator shows whether prep, spraying, or grinding is the constraint, which tells you where idle time is inflating the effective rate. Estimators who quote against nameplate capacity rather than realistic utilization systematically underprice, especially on low-volume mixed work where setup dominates.

Build the quote as a stacked bill: feedstock from consumption calculators at logged efficiency, plus bond coat, plus gas and torch wear consumables, plus masking and prep labor, plus booth time from adjusted spray time, plus finish grinding, plus inspection and a rework allowance, then apply margin. The Coated Part Cost calculator sums these and the Quote Price calculator applies your markup while showing sensitivity to efficiency and lot size. The common failure is quoting deposition alone and treating everything else as overhead, which understates true cost by 40 to 60 percent on feature-heavy precision work.

Lot size drives per-part cost more than any process parameter on short runs. Fixed charges like fixture setup, first-article layout, mask staging, and program proveout are one-time per batch, so a 250-dollar setup that vanishes into noise at 500 parts adds 50 dollars per part at 5 parts. Always quote per-part cost at the actual order quantity, and when a customer asks for a repeat at higher volume, requote rather than reusing the low-volume number. A defensible quote states its lot-size assumption explicitly so both sides know the price moves when the quantity does.

Published 2026-07-01.