QuotedPartCost guides · Updated 2026-10-30
How much does it cost to machine stainless steel?
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Stainless cost changes with both the grade's stock price and how hard it is to cut. This table runs the same milled reference part in 303, 304, 316, 17-4 PH, 410, 416, and duplex 2205 at quantities 10 and 100. The catalog machinability factor is shown beside the dollar result so the reason for a change is inspectable.
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The grades do not share one cycle time
303 has a 0.40 catalog machinability factor, while 316, 17-4, and duplex grades are lower in this model. The same removal, finishing, hole, and setup terms therefore produce different run minutes before material price is added.
The table also keeps the stock input visible. A grade with a higher pound price can still be competitive on a light part, while a slow grade can dominate on a pocket-heavy geometry.
- Confirm condition: annealed, cold drawn, or aged.
- Use the customer's specified grade, not a convenient substitute.
- Review work hardening and chip control with the machinist.
303 versus 304 versus 316
303 is often chosen for machinability, 304 for general corrosion resistance, and 316 for a stronger corrosion requirement. Those are design decisions, not just cost decisions. The estimator should show what the material change does to stock and cycle time while the pricing modeler confirms the part still meets service requirements.
17-4 and duplex add their own heat-treatment and inspection questions. The table does not invent those outside requirements; add them when the drawing or purchase order calls them out.
- Do not promise corrosion performance from a cost table.
- List heat treatment and passivation explicitly.
- Check certification and traceability requirements.
Use the result for a material conversation
At quantity 10, setup and programming remain meaningful. At quantity 100, the per-part comparison reflects more of the grade's material and cycle-time difference. If the geometry changes, rerun all grades rather than carrying over a ratio from this workholding.
No market-wide rate range is claimed here. The only sourced price is the dated catalog input; the rest is a transparent internal model that a shop can replace with its own numbers.
- Show assumptions on the quote.
- Keep quantity and lot total visible.
- Replace catalog inputs with supplier and shop data.
Use the result as an estimator's starting point
For this cost to machine 303, 304, 316, and 17-4 stainless example, an estimator can challenge every cnc milling input. Replace this fictional geometry with the customer's STEP file or drawing, then replace the catalog stock price, work-center rate, setup minutes, and markup with the shop's current 3-axis vmc values.
Keep the lot setup visible when you send this quote for cost to machine 303, 304, 316, and 17-4 stainless. Confirm stock form, material condition, tolerances, inspection, deburr, and outside-process timing before promising a ship date. If one of those inputs changes, rerun the calculation and show the buyer what moved.
- Show both unit and lot totals.
- Label illustrative values clearly.
- Have the estimator review access, tooling, and first-piece risk.
Same reference bracket across stainless grades
- • Material: Stainless 303; the US catalog input is $6.24/lb and machinability 0.40 relative to 6061-T6.
- • Process: CNC milling; the pricing model includes CAM programming, 12 toolpaths, Mill, 3 setups, Handling and tool changes, 5 lb stock, Deburr, Inspect and calculates the quantities shown.
- • Geometry: 4 × 3 × 1 in; Fictional 4 × 3 × 1 in prismatic reference part. Two mill setups are inferred from the top and side features.
- • Markup: 30% catalog default. Taxes, freight, customer-specific rates, and unlisted outside services are excluded.
- • Every dollar and minute in the table is a reproducible example from the stated inputs, not a market average or supplier promise.
| Material | Quantity | Catalog stock | Machinability | Quoted / part | Lead days |
|---|---|---|---|---|---|
| Stainless 303 | 10 | $6.24/lb | 0.40 | $118.16 | 11 |
| Stainless 303 | 100 | $6.24/lb | 0.40 | $74.05 | 16 |
| Stainless 304 | 10 | $6.87/lb | 0.30 | $129.73 | 12 |
| Stainless 304 | 100 | $6.87/lb | 0.30 | $84.32 | 17 |
| Stainless 316 | 10 | $8.99/lb | 0.28 | $144.89 | 12 |
| Stainless 316 | 100 | $8.99/lb | 0.28 | $96.27 | 17 |
| Stainless 17-4 PH | 10 | $7.30/lb | 0.25 | $137.64 | 12 |
| Stainless 17-4 PH | 100 | $7.30/lb | 0.25 | $92.01 | 18 |
| Stainless 410 | 10 | $4.50/lb | 0.42 | $107.25 | 11 |
| Stainless 410 | 100 | $4.50/lb | 0.42 | $72.97 | 16 |
| Stainless 416 | 10 | $4.75/lb | 0.66 | $97.70 | 11 |
| Stainless 416 | 100 | $4.75/lb | 0.66 | $63.40 | 15 |
| Duplex 2205 | 10 | $8.00/lb | 0.21 | $151.65 | 12 |
| Duplex 2205 | 100 | $8.00/lb | 0.21 | $117.36 | 19 |
Sources and limits
Claims are dated where they can change. Product calculations are examples from the stated inputs, not a promise about a customer's quote. Competitor wording is attributed to the source shown.
- The stock price input is taken from the US catalog, which records an Online Metals check on 2026-10-21. — source (checked 2026-10-21)
- Machinability factors in this table are estimating inputs from the US catalog, not cutting-tool recommendations.
Questions
Is this a guaranteed stainless steel family quote?
No. It is a transparent estimating example. Replace the example inputs with the customer's drawing, stock quote, current shop rates, and inspection or finish requirements.
Why does quantity change the unit price?
Setup and programming are lot costs. The pricing calculation spreads those costs across the stated quantity and keeps the per-part run time and material inputs visible.
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