Short answer: Gauge, thickness tolerance and surface are bought together, and each changes cost and forming. Thinner gauge costs more per tonne but less per part; a tighter tolerance costs more; and BA costs more than 2B. Springback and press load rise with these choices in predictable ways, so the lowest-cost purchase is the spec that meets the part tolerance without extra margin.
For cold rolled sheet and strip up to 2 mm — cookware, appliances, panels and stamped blanks — this guide helps you read how the three levers interact so you stop over-paying for tolerance or surface you do not need.
Quick Comparison
| Lever | Effect on cost | Effect on forming | Buying rule |
|---|---|---|---|
| Thinner gauge | Higher ¥/t, lower ¥/part | More springback, lighter part | Size for the part, not for per-tonne price |
| Tighter tolerance | Higher ¥/t | Less springback/weight drift | Hold only what the die needs |
| BA vs 2B | BA adds surface premium | Smoother draw, tighter look | Pay only for visible brightness |
The three levers rarely change $/t alone; what matters is cost per good part plus whether the run stays inside your product tolerance.
What Buyers Should Evaluate
- Decide cost on the finished part: a thinner gauge can cut material use even when its per-tonne price is higher.
- Set the tolerance to the die clearance and springback your product needs, not the tightest available.
- Choose the visible side and lock a sample when brightness matters; keep 2B for hidden parts.
Cross-check the thickness tolerance tables and the 2B/BA surface guide for your gauge and end use before finalizing the spec.
Common Purchasing Mistakes
- Comparing quotes on price per tonne while ignoring gauge, tolerance and surface, then missing the real per-part cost.
- Specifying tight tolerance or BA for hidden parts, paying a premium with no visible benefit.
- Ignoring springback when switching gauge, then fighting a dimension that moved with thickness.
Specify gauge, tolerance, surface and acceptance sample together, evaluate on cost per good part, and run a small trial before committing the full coil.
Recommended RFQ Wording
State grade, surface (2B/BA and which side is visible), nominal gauge with tolerance and governing standard, width, length (or coil weight), strip edge/burr limits, quantity, certificate type (EN 10204 3.1), and destination.
Ask for the price at the finished-part level, and request a small trial quantity so gauge, surface and forming are proven before the full shipment.
How Still Steel Supports the Project
Still Steel supplies cold rolled stainless steel sheet and strip from 0.2 to 2 mm in 2B and BA, with cut-to-length (开平), slitting and surface finishing, so gauge, tolerance and surface come balanced from one source. Share your part and target price with vip@still-steel.com, or discuss by WhatsApp.
Frequently Asked Questions
Does a thinner stainless sheet always cost less?
No. Per tonne, thinner gauge is usually more expensive to roll because it is harder to make and hold dimensionally. Per part, a thinner gauge uses less material, so the per-piece saving can more than offset the higher per-tonne price. Evaluate cost on the finished part, not on price per tonne.
When should I pay more for BA instead of 2B?
Pay for BA when a visible surface needs the brightness, like cookware, kitchenware, reflectors or decorative trim. For hidden or fabricated parts, 2B meets most needs without the surface premium. Approve a sample before paying for brightness you may not need.
How does thickness tolerance affect forming and springback?
A loose gauge band shifts press load and springback across a run, so parts can drift in dimension and weight. Tighter gauge reduces that drift but raises cost. Match the tolerance to what your die and product tolerance actually require rather than asking for the tightest available.
Technical References
- EN 10088-2 stainless steels: flat products and tolerances
- BSSA surface finish specification for stainless sheet
Reference documents support general selection principles. The final material and cost decision must follow the applicable contract, standard and engineering review for the specific part.