How do you calculate refractory lining wear rate?

Divide the thickness lost by the original installed thickness. Losing 8 mm from a 250 mm lining gives 8 ÷ 250 = 3.2% wear so far this campaign.

What is a good lining wear rate?

It depends on installed thickness and heats melted, but the goal is a low, steady percentage per heat. In the example, 3.2% consumed against a 95% retention target leaves a comfortable 91.8-point gap early in the campaign.

What does the gap to target mean here?

It's your retention target minus the current wear percentage — here 95 − 3.2 = 91.8 points of margin. As wear climbs each inspection, that gap shrinks toward zero, which is your signal to plan a reline.

How often should I measure lining wear?

Tie it to inspection windows — after set numbers of heats, at scheduled cold shutdowns, or after any abnormal event like a slopover. Consistent intervals let you fit a wear-per-heat slope and forecast the pull date.

Should I use average or worst-point thickness?

Trend the average for campaign health, but never reline on the average alone. A slag-line groove or tap-hole erosion can be double the average, so track the worst point separately and let it override the percentage.

Wear rate vs remaining lining life — what's the difference?

Wear rate is how much you've consumed so far; remaining life is a forecast built from that rate. Take the wear-per-heat slope from repeated readings and extrapolate to your minimum safe thickness to estimate heats left.

Refractories, Furnace Linings & Foundry Consumables calculator

Lining Wear Rate Calculator

Lining Wear Rate expresses how much of a furnace's refractory has been consumed as a percentage of what was installed, giving foundry and steel-shop maintenance teams a single number to trend across a campaign. Refractory engineers use it to convert raw thickness measurements — from laser profiling, drilled probes, or cold-shell inspection — into a wear percentage they can plot against heats melted and compare between linings or vendors. It matters because the working lining is a wear part with a finite budget: knowing you've consumed 3.2% and how far that sits from your retention target tells you whether the campaign is on plan or eating into safety margin. Get the trend wrong and you either pull a furnace early, wasting good brick, or push it too far and risk a breakout.

What this calculator does

Lining Wear Rate expresses how much of a furnace's refractory has been consumed as a percentage of what was installed, giving foundry and steel-shop maintenance teams a single number to trend across a campaign.
Use it when lining wear rate in refractories, furnace linings and foundry consumables needs a clean rate and gap-to-target you can put on a tier board.
It computes lining wear as thickness lost divided by installed thickness, then the gap between your retention target and the calculated wear.

Formula used

Lining Wear Rate rate = affected amount ÷ total amount
Gap to target = target rate - calculated rate

Inputs explained

Lining thickness lost this campaign:
Original installed lining thickness:
Target thickness-retention rate:

How to use the result

Use it at each inspection interval to trend wear against heats melted and forecast when the lining hits its pull point.
A single wear percentage averages the whole measured zone — it hides the local hot spot or slag-line groove that actually decides when you reline, so always pair it with worst-point readings.

Current U.S. benchmarks

The producer price index for steel mill products stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. Quotes priced off last quarter's material cost miss this move.
Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.
The U.S. has 3,569 primary metal manufacturing establishments employing about 354,911 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate refractory lining wear rate? Divide the thickness lost by the original installed thickness. Losing 8 mm from a 250 mm lining gives 8 ÷ 250 = 3.2% wear so far this campaign.
What is a good lining wear rate? It depends on installed thickness and heats melted, but the goal is a low, steady percentage per heat. In the example, 3.2% consumed against a 95% retention target leaves a comfortable 91.8-point gap early in the campaign.
What does the gap to target mean here? It's your retention target minus the current wear percentage — here 95 − 3.2 = 91.8 points of margin. As wear climbs each inspection, that gap shrinks toward zero, which is your signal to plan a reline.
How often should I measure lining wear? Tie it to inspection windows — after set numbers of heats, at scheduled cold shutdowns, or after any abnormal event like a slopover. Consistent intervals let you fit a wear-per-heat slope and forecast the pull date.
Should I use average or worst-point thickness? Trend the average for campaign health, but never reline on the average alone. A slag-line groove or tap-hole erosion can be double the average, so track the worst point separately and let it override the percentage.

Last reviewed 2026-05-12.