Stainless Steel Metal Stamping — 304, 316 & 430 Parts

Stainless Steel Stamping Capabilities

Stainless steel is harder to stamp than carbon steel due to its high work-hardening rate and springback — but when done correctly, it produces parts with outstanding corrosion resistance, strength, and surface quality that last decades without coating.

Our tooling engineers design dies specifically for stainless — with optimized clearances (6–8% per side vs. 4–5% for mild steel), carbide inserts in high-wear zones, and precision blank-holder pressure control to prevent wrinkling without tearing.

Stamping Process Challenges

• より高い成形力 — stainless steel requires 50–70% more tonnage than equivalent carbon steel, demanding heavier presses and more robust tooling
• 加工硬化 — austenitic grades (301, 304, 316) harden rapidly during forming, requiring careful process planning to avoid cracking
• スプリングバック — stainless steel springs back more than carbon steel after bending, requiring over-bend compensation in die design
• かじり — stainless has a tendency to gall (cold weld) against tooling surfaces, requiring specialized die coatings and lubricants
• 表面の敏感性 — scratches and die marks are more visible on stainless steel’s bright surface, demanding polished tooling and careful handling

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Tolerances for Stainless Steel Stamping

• Blanking / punching: ±0.05mm standard; ±0.02mm fine blanking
• Bend angle springback: Compensated by overbending — held to ±0.5°
• Deep draw diameter: ±0.05mm standard; ±0.02mm precision
• Flatness: 0.1mm per 100mm; 0.05mm with coining

Surface Finishes for Stainless Steel Parts

• #2B — mill finish (standard cold-rolled)
• BA (Bright Annealed) — mirror-like, smooth surface
• Brushed / Satin — directional grain, decorative
• Electropolished — ultra-smooth, cleanroom and medical-grade
• Passivated — enhanced corrosion resistance per ASTM A967
• PVDコーティング — colored stainless (black, gold, bronze)

用途

Stainless Stamping Design Notes for OEM Buyers

Stainless steel stampings require more engineering attention than mild steel parts because work hardening, galling, and springback can appear early in tooling trials. We review grain direction, bend radius, hole spacing, burr direction, and surface class before selecting the die route. For decorative or hygiene-sensitive parts, finish protection is planned during stamping rather than treated as an afterthought.

• For 304 and 316 parts: we plan higher forming loads, lubricant control, and passivation or electropolishing where corrosion performance matters.
• For 430 appliance parts: magnetic behavior, cost control, and visible surface consistency are usually the main project drivers.
• For spring or clip parts: temper, forming sequence, and stress relief may determine whether the part holds force over repeated use.

These controls help reduce trial-and-error during sampling and make stainless parts more predictable when they move from first article approval into repeat production.