How Thick Can Steel Plate Be Cut? Laser vs Flame Explained
Published cutting ranges extend to 200mm for flame cutting. Current reference ranges are 0.5–55mm for laser and 30–200mm for flame; final feasibility depends on the actual material and geometry.
Quick Reference
| Method | Thickness Range | Tolerance | Max Panel Size |
|---|---|---|---|
| Laser cutting | 0.5–55mm | ±0.1 ~ ±0.3 mm | 3500×26000mm |
| Flame cutting | 30–200mm | ±0.5–1mm | 5500×30000mm |
Both methods overlap between 30–55mm. The decision in that zone comes down to tolerance requirement and edge condition.
Laser Cutting: 0.5–55mm
Laser cutting can provide a cleaner cut edge on suitable material and geometry. The published tolerance reference is ±0.1 ~ ±0.3 mm; process selection still depends on thickness, features, critical dimensions, and downstream work.
Within the laser/flame overlap range (30–55mm), either route may be considered. Quotation review should compare material, geometry, critical dimensions, quantity, edge condition, and follow-on work.
The edge condition matters here. Laser-cut parts at 40mm typically need deburring only. Flame-cut parts at 40mm need slag removal and often grinding if the next step is welding or tight assembly.
Flame Cutting: 30–200mm
Flame cutting handles everything from 30mm to YUNCUT's maximum of 200mm. Tolerance is ±0.5–1mm. Maximum panel size is 5500×30000mm — significantly larger than laser.
Above the published laser maximum, flame cutting is the applicable thermal-cutting route currently stated by YUNCUT. Surface quality is controlled according to material, thickness and project requirements. Any slag removal, grinding, or weld-preparation requirement should be included in the delivered-state scope.
Thicker plate is not always slower to ship. A simple 80mm structural bracket can cut and ship faster than a 10mm laser part with many small holes. Part complexity can affect lead time more than thickness alone — both are confirmed at quotation.
The 30–55mm Overlap Zone
Both methods work here. Three factors determine which to use:
- Tolerance: Laser gives ±0.1 ~ ±0.3 mm; flame gives ±0.5–1mm
- Hole geometry: For smaller holes, laser generally produces more consistent results — laser minimum hole rule is ≥0.4 × Material Thickness, flame ≥0.7 × Material Thickness. A 30mm plate with 12mm holes is a laser job.
- Edge condition: Laser edges need deburring. Flame edges need slag removal at minimum. If Surface quality is controlled according to material, thickness and project requirements. is required for downstream welding, grinding must be added either way.
A buyer ordering 40mm carbon steel for a structural frame typically asks whether to use laser or flame. We quote both when a part falls in this range, so buyers can compare cost and make the call based on their tolerance requirement.
Edge Quality After Cutting
| Condition | Surface Quality | Typical Use |
|---|---|---|
| Laser cut | Surface quality is controlled according to material, thickness and project requirements. | Clean, deburring only |
| Flame cut | Surface quality is controlled according to material, thickness and project requirements. | Slag removal needed |
| After grinding | Surface quality is controlled according to material, thickness and project requirements. | Weld-ready |
| After shot blasting | Sa2.5 | Coating-ready |
Shot blasting or other surface preparation can be reviewed when coating preparation is required. If a cleanliness standard such as Sa 2½ is required, state it explicitly in the project specification and quotation scope.
What Changes at 100mm, 150mm, and 200mm
100mm: Flame cutting, ±0.5–1mm tolerance. Thermal distortion is manageable with correct nesting sequences. Parts with a high length-to-width ratio — long, narrow profiles — need to be flagged before cutting starts.
150mm and 200mm: Same process. Setup time increases. Pre-production review is recommended to confirm hole sizes and part geometry are feasible at these thicknesses.
200mm: YUNCUT's upper limit. Edge condition and slag specification must be agreed before production. Not all shapes are achievable — discuss before sending drawings.
Frequently Asked Questions
What's the thickest steel plate YUNCUT can cut?
200mm using CNC flame cutting. At this thickness, edge condition requirements and part geometry need to be discussed before the order starts. Send your drawing first.
Can laser cut 50mm steel plate?
Yes. Laser cutting handles up to 55mm. At 50mm, tolerance is ±0.1 ~ ±0.3 mm depending on geometry. Edge quality is typically better than flame at this thickness, and slag removal is generally not needed.
At what thickness should I switch from laser to flame cutting?
Above 55mm, flame cutting is the applicable option at YUNCUT. Between 30–55mm, it depends on your tolerance requirement. If ±1mm is acceptable, flame is typically lower cost. If you need ±0.3mm, stay with laser.