QuotedPartCost guides · Updated 2026-10-30
17-4 PH versus 316: which stainless is cheaper to machine?
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On the milled block, 17-4 PH is cheaper than 316 by $30.29 at one, $7.25 at 10, and $4.26 at 100 pieces ($566.98 versus $597.27 at one). The gap comes from the two grades’ stock prices and cutting rates; corrosion and strength requirements decide whether either grade is acceptable.
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The 17-4 PH stainless versus 316 example part
The reference block has a pocket, four through holes and two tapped side holes. 17-4 may be supplied in a condition that needs aging, while 316 may need passivation. Neither outside process is silently assumed in the machining comparison.
How the quantity break works
17-4’s lower machinability factor stretches the cut, while 316’s stock line is higher in the catalog. The fixed setup is the same, so the alloy effect becomes clearer as quantity rises. A tight tolerance, thin wall or deep pocket can overshadow the material difference.
| Qty | Setup min (lot) | Cycle min (part) | Cost / part | Quoted / part | Lot price | Lead days |
|---|---|---|---|---|---|---|
| 1 | 191.0 | 26.7 | $459.44 | $597.27 | $597.27 | 11 |
| 10 | 191.0 | 26.7 | $111.45 | $144.89 | $1448.90 | 12 |
| 100 | 191.0 | 26.7 | $74.05 | $96.27 | $9627.00 | 17 |
What the material or process changes
Check corrosion environment, hardness, weldability, magnetic behavior and customer specification before approving a substitution. A lower quote that fails the requirement is not a saving. If heat treatment or passivation is needed, add it with the vendor’s minimum and lead time.
How to turn this into a firm quote
Show the buyer both engine outputs and identify the assumption that changed. That keeps the decision reviewable when the selected grade, condition or finish changes later.
Questions to settle before release
Ask for corrosion exposure, hardness, weld procedure, magnetic requirement and post-machining finish before substituting these stainless grades. Confirm whether aging or passivation needs a vendor certificate. Those operations can outweigh the raw machining delta. The two engine tables are a cost conversation starter; the customer’s specification decides which line is a valid quote.
For this 17 4 vs 316 machining cost estimate, for a firm release, have the programmer and machinist read the assumptions together. They can spot an inaccessible feature, an extra load, a tool change or an inspection step before the number reaches the buyer. Treat the computed table as a shared starting point: the shop’s measured method and the customer’s print decide which edits belong in the final route.
For this 17-4 and 316 decision, have engineering sign off on corrosion and hardness before purchasing stock. The final release should preserve the drawing revision, stock source and inspection decision with the computed table.
Pricing engine output for the stated Stainless 17-4 PH CNC milling example part
- • Material: Stainless 17-4 PH; the US catalog stores its small-lot price and machinability factor.
- • Process: CNC milling; setup, machine time, deburring and inspection are generated from the example-part geometry.
- • Markup: 30% default US catalog markup; quantities are 1, 10, 100.
- • Fictional 4 × 3 × 1 in milled block; no finish or outside process.
- • No outside finish, tax, freight, or customer-specific rate is included.
- • These are computed examples, not supplier quotes or market averages.
| Qty | Setup min (lot) | Cycle min (part) | Cost / part | Quoted / part | Lot price | Lead days |
|---|---|---|---|---|---|---|
| 1 | 191.0 | 28.6 | $436.14 | $566.98 | $566.98 | 11 |
| 10 | 191.0 | 28.6 | $105.88 | $137.64 | $1376.40 | 12 |
| 100 | 191.0 | 28.6 | $70.78 | $92.01 | $9201.00 | 18 |
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 figures are computed from the stated example part and US catalog assumptions.
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