Chemical Etching Formula
50CrV4 Spring Steel with FeCl₃+HCl

Formula Summary

The table below summarizes every parameter that defines this etching formula. Values listed as ranges scale with sheet thickness across the supported band.

Why FeCl₃+HCl for 50CrV4 Spring Steel?

On 50CrV4 Spring Steel, the ferric chloride system attacks the alloy's oxide layer continuously while ferric ions drive dissolution. It is regenerable, compatible with standard photolithography, and produces clean burr-free edges — which is why nearly every 50CrV4 Spring Steel etch line runs a variant of this formula.

Process Window & Bath Control

Hold the bath at 50°C with concentration 44 °Bé (specific gravity 1.410). Across the 0.1-0.3 mm thickness range, conveyor speed runs from 0.2-1.05 m/min — thinner sheets move faster, thicker sheets slower, in roughly inverse proportion to thickness. A typical mid-range setpoint is 0.37 m/min for 0.20 mm stock. Use redundant PID temperature control to hold the bath within ±1.5°C, and titrate at least once per shift.

Design Rules & Tolerances

Design rules for this recipe: hole diameter 120-360 μm, line width 100-300 μm, single-side undercut 19-56 μm — all as a function of thickness across 0.1-0.3 mm. The higher the etch factor (this formula holds about 2.68), the tighter the achievable tolerance. Below the minimum feature sizes, yield falls off steeply, so treat those numbers as hard floors rather than targets.

Yield & Production Economics

Expect a yield in the 96.2-96.8% range for 50CrV4 Spring Steel with FeCl₃+HCl, with 96.5% typical on a well-controlled line. Most rejects trace back to upstream coating and exposure rather than to the etch bath itself, so tightening photolithography control is usually the fastest path to a higher number.

Typical Applications

50CrV4 Spring Steel etched with this recipe typically ends up in spring elements, blades, shim stock, and stamped-replacement flat parts. Because chemical etching applies no mechanical or thermal load, the finished features are free of work-hardening and heat-affected zones — a decisive advantage over stamping or laser cutting for these uses.

Process Equipment & Material Reference

On the shop floor, this 50CrV4 Spring Steel + FeCl₃+HCl recipe is implemented on a knife-mold etching machine. The 50°C bath setpoint and 0.2-1.05 m/min conveyor range correspond to verified production envelopes on that equipment for through etch (double-sided).

If you need a wider view of steel beyond this single recipe, our Steel chemical etching guide covers grade selection, photoresist compatibility, and typical industries that consume this metal in etched form.

Production Use Cases for This Formula

Typical end-uses for 50CrV4 Spring Steel run on this formula include cold-press juicer filtration mesh, high-speed air-intake mesh for hair dryers, and juicer filtration mesh etching. The 50°C bath and 0.1-0.3 mm supported thickness range cover most of the production work in these segments without re-tuning chemistry.

Adjacent applications usually transfer onto this same formula with no chemistry change, sometimes only a conveyor speed tweak. Drop a drawing and a target volume and we will return a process card built off the parameters on this page.

Other Metals Etched with FeCl₃+HCl

The FeCl₃+HCl chemistry is also documented for these alloys.

More Carbon & Tool Steel Formulas

Other formulas in the same material family.

Frequently Asked Questions