Surface finish achievable with 304 Stainless Steel
304 Stainless Steel is the general purpose austenitic stainless steel, with chromium and nickel. It is used for general corrosion resistant parts where the chloride resistance of 316L is not needed. This entry explains what it is, what the numbers on a data sheet mean, and what to put on a drawing.
It is written from the point of view of the buyer and the drawing office: the values that are realistic in production, the ones that cost money, and the way the result is verified. Where an industry sets the requirement, automotive is used as the example: a fixed takt, because a late delivery stops the line.
What finish is achievable
The finish left by 304 Stainless Steel is Ra 1.6 µm as machined. It is measured with a stylus instrument and reported as Ra, and the lay – the direction of the pattern – matters as much as the value on a face that seals or slides.
| Aspect | Value |
|---|---|
| Finish | Ra 1.6 µm as machined |
| Process | 304 Stainless Steel |
| Measurement | stylus instrument or comparison sample |
| Tolerance held | ±0.02 mm |
| Effect of cost | material cost is lower than 316L |
How it is improved
A finer finish is a separate operation, not a setting: a finishing pass, a dressing pass, or a secondary process. Material cost is lower than 316L, so the call out belongs only on the faces that need it.
How it is checked
Standard dimensional inspection. Where the drawing gives a value, the report records where and how it was measured, because the same face can read differently in different directions.
Applications
304 Stainless Steel is used for general corrosion resistant parts where the chloride resistance of 316L is not needed, and in practice it appears most often in fasteners, food preparation surfaces, architectural hardware, general brackets.
How it fits into a machining route
304 Stainless Steel is chosen at the drawing stage, and everything downstream follows from it: the tool geometry, the cutting data, the heat treatment and the certificate. Changing the grade later is a different part, not a different quote.The route is fixed before the first part is cut, and it is the route rather than the individual setting that holds the result: material cost is lower than 316L. Where a drawing calls for something the route cannot hold economically, that is raised at quotation rather than after the parts are made.
Standards, documentation and what is issued
The documentation requirement is EN 10204 3.1 available. Material is supplied against a certificate where the application calls for it, inspection results are recorded with the job, and the records are kept so that a repeat order can be compared with the first instead of being measured from scratch.
Standard dimensional inspection is the verification step. Where a customer format or a standard report is required, it is agreed before the batch starts, because a report written after the event is a report nobody can use.
Frequently asked questions
What tolerance should be specified for 304 Stainless Steel?
±0.02 mm is realistic in production. Tightening it beyond the functional requirement increases cost without improving the part.
Which material is usually used?
304 stainless steel is the usual choice, supplied against EN 10204 3.1 available.
How is the result verified?
Standard dimensional inspection, with the results recorded so a repeat order can be compared with the first.
What is the most common mistake?
Welding a thick section without considering carbide precipitation.
How long does it take and what does it cost?
A realistic cycle is moderate cutting speed, and the cost driver is material cost is lower than 316L.
Related capability
If you are specifying 304 Stainless Steel on a drawing and want a second opinion on the route, send the model and the quantity. The first response is a manufacturability review with the likely risk points and a quotation, so the decision can be made on facts rather than on a price alone.
Machining, inspection and documentation are handled in one place, which is why the dimensional report and the material certificate arrive with the parts rather than after them.
Related entries
These entries sit next to 304 Stainless Steel in the encyclopedia: 4140 Alloy Steel, PEEK, O-Ring Grooves. Reading them together gives a fuller picture of how the process, the material and the measurement affect each other.
