Technical Guide

Fiber Laser Cutting Speed & Thickness Chart: Real Parameters by Power (2026)

Q: How fast is fiber laser cutting?

On 1-2mm carbon steel, a 3kW fiber laser cutting machine runs at 20-35 meters per minute. On 10mm carbon steel, the same machine drops to about 1.5 m/min. High-power machines of 10-20kW can exceed 120 m/min on thin sheet, according to 2026 market data. Speed depends on power, material, thickness and assist gas, so the useful question is always: speed at which thickness.

Q: What thickness can a fiber laser cut?

A 1.5kW fiber laser cuts carbon steel up to about 16mm, stainless steel up to 6-8mm, and aluminum up to 4mm with nitrogen. A 3kW machine handles 20-25mm carbon steel and 12mm stainless steel. Machines of 8-20kW cut stainless steel up to 50mm, and the highest power units are replacing plasma on thick plate. The 2026 market shows 2.1-6kW machines covering most 6-20mm plate work.

Q: What power fiber laser cutter do I need?

For sheet metal up to 3-4mm, a 1.5-2kW machine is enough and keeps costs low. For mixed fabrication up to 12-16mm plate, a 3kW fiber laser cutting machine is the most common choice, and it is the model most of our customers start with when they move up from a small cutter. For regular cutting of 20mm plus plate, or stainless and aluminum with nitrogen, move to 6kW or higher. Machines in the 2.1-6kW range held about 38% of the market in 2025, which tells you where most shops land.

Q: How can I increase fiber laser cutting speed?

Check four things before touching the machine settings. First, gas purity: nitrogen below 99.9% slows stainless cutting noticeably. Second, focus position: on thick carbon steel with oxygen, cutting with a positive focus of +2 to +4mm gives faster, cleaner results. Third, nozzle size and condition: a worn nozzle changes gas flow and ruins edge quality at speed. Fourth, nesting: grouping parts and using common-cut lines can lift effective throughput by 15-30% without any change in m/min.

Q: Is laser cutting speed measured in m/min or mm/min?

Both appear in data sheets. Thin sheet speeds are usually shown in m/min (meters per minute), like 20-35 m/min on 1-2mm steel. Thick plate speeds are often shown in mm/min, like 300-500 mm/min on 16mm plate. To convert, multiply m/min by 1000 to get mm/min. When comparing quotes from suppliers, make sure both use the same unit.

August 10, 2026

A 3kW fiber laser cutting machine cuts 2mm carbon steel at about 20 m/min and 10mm plate at 1.5 m/min. A 1.5kW machine handles up to 16mm carbon steel with oxygen and 6mm stainless steel with nitrogen. If you cut mostly sheet under 4mm, 1.5-2kW is enough. Mixed plate work up to 16mm needs 3kW. Regular thick plate, stainless or aluminum, means 6kW and up. These numbers come from reference cutting parameter tables published in April 2026 and 2026 market reports, and they match what I see in supplier test data.

Speed questions are the first thing buyers ask me. "How fast is the machine?" is the usual opening. I get it, everyone wants a fast cutter. But speed without thickness means nothing, so let me give you real numbers for both, sorted by power.

Fiber Laser Cutting Speed Chart: Carbon Steel with Oxygen

Carbon steel is cut with oxygen in almost every shop. Oxygen helps the cut, speeds it up, and leaves a slight oxide edge that is fine for most parts. The table below is from a reference parameter sheet published in April 2026, based on a standard 3kW machine. Speeds are in meters per minute.

Steel Thickness	3kW Speed (m/min)	2kW Speed (m/min)	1.5kW Speed (m/min)
1mm	35	25	20
2mm	20	9	5
3mm	4	4.2	3.6
5mm	3.2	2.2	1.8
8mm	2.2	1.3	1.2
10mm	1.5	1.1	1.0
16mm	0.8	0.7	0.5
20mm	0.5	0.4	-

Source: SBMachines fiber laser cutting parameter tables, April 2026. Oxygen assist, standard nozzle and focus settings. Your results vary with material quality, gas purity and optics condition.

Fiber Laser Cutting Speed Chart: Stainless Steel and Aluminum with Nitrogen

Stainless and aluminum are cut with nitrogen so the edge stays bright and oxide-free. That changes the speed picture completely. Nitrogen cutting is slower than oxygen cutting at the same thickness, and it needs more power. This is where a 3kW machine starts to feel small on stainless over 6mm.

Material	1.5kW	2kW	3kW
Stainless 1mm	20 m/min	28 m/min	35 m/min
Stainless 2mm	7 m/min	10 m/min	14 m/min
Stainless 3mm	4.5 m/min	5 m/min	7 m/min
Stainless 5mm	1.5 m/min	2 m/min	3 m/min
Stainless 6mm	0.8 m/min	1.5 m/min	2.2 m/min
Aluminum 1mm	15 m/min	20 m/min	25 m/min
Aluminum 3mm	2.5 m/min	4 m/min	5.5 m/min
Aluminum 5mm	-	0.9 m/min	1.8 m/min

Source: SBMachines fiber laser cutting parameter tables, April 2026. Nitrogen assist at 10-16 bar depending on thickness.

What About 6kW and 12kW Machines?

High-power machines exist for one reason: thick plate with nitrogen. A 6kW fiber laser cuts stainless steel at roughly double the speed of a 3kW unit on 6-10mm material, and it makes clean nitrogen cuts on stainless up to 25-30mm. A 12kW machine pushes that to 40-50mm stainless, which is where it starts replacing plasma in heavy fabrication.

Market numbers back this up. According to a January 2026 Mordor Intelligence report, the laser cutting machine market was about USD 7.82 billion in 2026 and is forecast to reach USD 12.34 billion by 2031, a 9.55% CAGR. Fiber lasers held 51.72% of the market in 2025. Machines in the 2.1-6kW range took 37.85% share, while platforms above 12kW are expected to grow at a 14.3% CAGR through 2031. Another 2026 report on fiber laser cutters put machines over 10kW at about 21% of heavy industrial cutting installations, and noted that 10-20kW machines exceed 120 m/min on thin sheet.

How to Read a Speed Claim Without Getting Burned

Suppliers love quoting their best-case speed. Here is how to check a claim in sixty seconds.

Ask for the speed at the thickness you actually cut, not the maximum. A machine that does 35 m/min on 1mm steel might do 1.5 m/min on 10mm. Ask which gas was used: oxygen cutting of carbon steel is faster than nitrogen, so a nitrogen number on stainless and an oxygen number on carbon steel are not comparable. Ask for the test material grade and surface condition: mill scale on hot-rolled plate slows the cut. Then check the edge quality at that speed. Speed means nothing if the edge has dross you have to grind off.

One more thing I tell buyers: do not buy power you will not use. A 3kW fiber laser cutting machine covers most sheet and light plate work and costs a lot less to run than a 6kW unit. The extra power only pays for itself if the plate is regularly over 12-16mm or you do a lot of stainless and aluminum.

Practical Speed Tips from the Shop Floor

These are the four things that actually move cutting speed in production, in the order I would check them.

Gas purity. Nitrogen under 99.9% slows stainless cutting and leaves a yellow edge. Check the tank certificate, not the label on the regulator. Focus position. On thick carbon steel with oxygen, a positive focus of +2 to +4mm gives noticeably faster and cleaner cuts. On thin sheet, zero or slightly negative focus. Nozzle condition. A worn or damaged nozzle changes the gas flow and forces you to slow down to keep edge quality. Swap it early. Nesting. Grouping parts and using common-cut lines lifts real throughput 15-30% without touching the m/min at all. Most operators leave 10-15% of speed on the table from poor nesting alone.

Which Power Should You Buy?

Here is the honest version, based on what customers actually cut.

1.5-2kW: sheet metal up to 3-4mm carbon steel, light stainless, signage and small fabrication. Lowest buy-in and running cost.
3kW: the sweet spot for mixed work up to 16mm carbon steel, 6-8mm stainless, 4-5mm aluminum. Most new buyers land here.
6kW: regular 12-25mm plate, stainless and aluminum with nitrogen at good speed. This is the fastest-growing segment for good reason.
12kW and up: thick plate over 30mm, heavy fabrication, shipyards, structural steel. Replacing plasma in many shops.

If you are still unsure, send me your material list and typical thicknesses. I can point you to the right machine and share test cut data from our laser cutting machines. That is a lot more useful than guessing from a chart.

Frequently Asked Questions

How fast is fiber laser cutting?

On 1-2mm carbon steel, a 3kW machine runs at 20-35 m/min. On 10mm carbon steel, it drops to about 1.5 m/min. High-power machines of 10-20kW can exceed 120 m/min on thin sheet. Speed always depends on thickness and material, so compare numbers at the thickness you actually cut.

What thickness can a fiber laser cut?

A 1.5kW machine cuts carbon steel to about 16mm, stainless to 6-8mm, aluminum to 4mm. A 3kW machine handles 20-25mm carbon steel and 12mm stainless. Machines of 8-20kW cut stainless up to 50mm. Fiber lasers in the 2.1-6kW range cover most of the 6-20mm plate work in the market today.

What power fiber laser cutter do I need?

Sheet metal up to 3-4mm: 1.5-2kW. Mixed fabrication up to 16mm plate: 3kW. Regular 20mm plus plate, or stainless and aluminum with nitrogen: 6kW and up. If you want a recommendation for your exact material list, check the specs on our fiber laser cutting machine pages and send us your typical thicknesses. The 2.1-6kW range held about 38% of the 2025 market, which matches where most shops land.

How can I increase fiber laser cutting speed?

Check gas purity first, then focus position, then nozzle condition. On thick carbon steel with oxygen, a positive focus of +2 to +4mm cuts faster and cleaner. Better nesting with common-cut lines can lift real throughput 15-30% without changing the m/min at all.

Is laser cutting speed measured in m/min or mm/min?

Thin sheet speeds use m/min, like 20-35 m/min on 1-2mm steel. Thick plate speeds use mm/min, like 300-500 mm/min on 16mm plate. Multiply m/min by 1000 to convert. Make sure both quotes use the same unit before comparing.

Written by David Chen, Sales Engineer at FANY LASER. Connect on LinkedIn