Three facts that decide this page
- Cold reduced close annealed sheet behaves consistently in the press because thickness and yield are tightly controlled, which is why IS 513 and EN 10130 grades are the default for repeat stamping.
- A 12 kW fibre laser on a 40 ft by 16 ft bed cuts long panels and coach sections in one piece, which removes the split, joggle and weld that a smaller bed forces.
- Mild steel cuts quickly with oxygen on thicker sections and with nitrogen where a clean, paintable edge matters. The oxide left by oxygen cutting is the usual reason a coating fails at the cut edge, so the assist gas is a finishing decision, not only a speed decision. CRCA also flashes rust quickly after cutting, so cut-to-coat time is part of the route.
What changes when you laser cut CRCA
Mild steel cuts quickly with oxygen on thicker sections and with nitrogen where a clean, paintable edge matters. The oxide left by oxygen cutting is the usual reason a coating fails at the cut edge, so the assist gas is a finishing decision, not only a speed decision. CRCA also flashes rust quickly after cutting, so cut-to-coat time is part of the route.
The commercial consequence is that CRCA is priced on its own material line, not blended into a steel rate. Material grade, thickness, tolerance and finish are quoted separately from conversion, so a change of specification is visible in the price.
Tolerance, edge and finish
Ganesh quotes to the drawing first and to ISO 2768 general tolerances where the drawing is silent. For CRCA laser cutting, the practical starting points are in the table below. They are starting points, not a guarantee: the part geometry, thickness and fixturing decide what can actually be held, and the quotation states the tolerance offered.
How Ganesh runs this route
Cut quality depends on assist gas, focus position and nozzle condition more than on the headline power; nitrogen gives an oxide-free edge on stainless and aluminium. Hot-rolled IS 2062 E250 plate above 6 mm is cut and formed, not pressed, on Ganesh's route: the 12 kW fibre laser cuts to 20 mm and the 200 T brake forms to 10 mm. The route is quoted as one sequence so the customer does not have to coordinate a cutter, a former, a welder and a coater.
When laser cutting is the wrong route for CRCA
Laser cutting stops making commercial sense when a simple flat part runs in high volume and the geometry is stable; at that point a blanking die wins on piece price. It is also the wrong tool for a part that needs coining or a sharp formed lip that only a press can produce.
A manufacturability review before quotation is the cheapest place to find this out. Send the drawing, material, finish and annual quantity and the review comes back in writing.
Typical parts
- Rack rails and panels
- Canopy and louvre panels
- Elevator brackets
- Gussets and mounting plates
Decision rule: when to choose laser cutting
Use laser cutting when the design is still moving, when the volume does not justify a tool, or when the part is large enough that a press tool would be uneconomic. It is also the right first operation for a part that will be formed and welded, because a nest can carry several different parts at once. It stops being the cheapest route when a flat part with stable geometry runs in high volume, at which point a blanking die wins on piece price and generally on edge quality too. For CRCA the practical constraint is rust: cut, formed and coated parts should not sit unprotected in a humid shop, and the route is sequenced so pretreatment follows fabrication within the same production window. CRCA is also the easiest material to change late: a grade swap from CR1 to CR4, or a 0.2 mm thickness change, can be made without retooling in many cases, which keeps the decision reversible while volumes are still uncertain.
What to put on the drawing
Send a DXF with the cut contour on its own layer, no duplicate or open entities, and a drawing that states material grade, thickness, tolerance and finish. State which edges are cosmetic and which are weld prep, because the assist gas and the deburring requirement follow from that. If the part is long, say the maximum length: a 4,450 mm panel that fits the 40 ft bed in one piece does not need a joint.
Quality evidence and inspection
Inspection covers the cut contour against the DXF, overall size, hole position, squareness and edge condition. Burr is checked visually and by touch on cosmetic edges. Material is traceable to the mill certificate where the customer requires it. First article parts are inspected before a repeat run.
What drives the cost
Cost splits into material, machine time, handling, deburring and any secondary operation. Material is quoted at the prevailing rate for the grade and thickness, on the nest area consumed rather than the finished part area. Machine time is set by cut length, thickness, pierce count and nesting density. Deburring is a separate operation and is often the line that surprises a buyer. On CRCA / mild steel, material is quoted as its own line at the prevailing rate for the grade and thickness, so a change of specification is visible rather than hidden in a blended rate.
| Specification | CRCA / mild steel laser cutting | Ganesh limit or note |
|---|---|---|
| Grades | IS 513 CR1–CR4 (D, DD, EDD), IS 2062 E250 for hot-rolled plate | Mill certificate on request |
| Thickness | 0.5–6 mm sheet; up to 20 mm plate | 12 kW fibre, 6 kW and 3 kW support machines |
| Tensile / property | 270–410 MPa | 7.85 g/cm³ density |
| Delivery condition | Skin-passed, oiled coil or cut sheet | Check mill certificate for grade and oiling |
| Typical yield strength | 210–350 MPa depending on grade | Higher yield needs more tonnage and more overbend |
| Springback | Low to moderate | Press brake and die both compensate |
| Laser cutting | 12 kW fibre, 6 kW and 3 kW support machines | Mild steel, stainless, aluminium, brass, copper |
| Tolerance basis | ISO 2768-m unless drawing states otherwise | Critical features inspected |
| Finish | Seven-tank pretreatment then powder coat or wet paint | Specified per part |
Sources and review
- IS 513 — Cold reduced carbon steel sheets and strips · reviewed 2026-11-03
- EN 10130 — Cold rolled low carbon steel flat products · reviewed 2026-11-03
- IS 2062 — Hot rolled medium and high tensile structural steel · reviewed 2026-11-03
- IS 513 CRCA sheet grades and cutting · reviewed 2026-11-03
Combines Ganesh machine limits (12 kW fibre, 6 kW and 3 kW support machines) with CRCA / mild steel grade and property data. The "what changes" section is written for this material–process pair and is not reused on another page.
Send the drawing and we will check the route
Material, thickness, tolerance, finish and annual quantity are enough for a manufacturability review. Tooling is quoted separately from the piece price.
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