Grade dossier
201 Stainless Steel Properties and Selection
A lower-nickel austenitic grade for moderate environments where strength, formability and cost control matter more than matching 304 corrosion performance.
Identity before substitution
Define the grade, product and condition together
A familiar grade name is not a complete purchase specification. Product form, controlling standard, dimensions, condition, finish, certification and service environment determine whether the delivered material is suitable.
Composition control
ASTM A240/A240M flat-product chemistry
Limits are not heat analysis targets
The table summarizes grade limits commonly used for plate, sheet and strip. Pipe, tube, bar, forgings and cast products can be governed by different specifications. Always place the product standard and edition on the purchase order.
| C | 0.15 max |
|---|---|
| Mn | 5.50-7.50 |
| Si | 1.00 max |
| P | 0.060 max |
| S | 0.030 max |
| Cr | 16.00-18.00 |
| Ni | 3.50-5.50 |
| N | 0.25 max |
Properties with context
Minimums, typical indicators and delivered condition
Specified annealed flat-product values
| Tensile strength | 515 MPa min |
|---|---|
| 0.2% yield strength | 260 MPa min |
| Elongation | 40% min |
| Hardness | 95 HRB max |
Selection indicators
| Density | about 7.9 g/cm3 |
|---|---|
| PRE indicator | about 17; not a service limit |
| Work hardening | High |
| Relative corrosion margin | Below 304 in many environments |
Values depend on product form, thickness, test orientation, condition and governing edition. Use the mill test certificate and the purchase specification for acceptance, not a web table alone.
Selection boundary
Where 201 belongs and where to escalate
Grade selection is an environmental decision, not a popularity contest. Review the complete medium, temperature, geometry, fabrication, cleaning and inspection requirements.
Good reasons to evaluate it
Indoor equipment and trim
Food-service equipment after application review
Formed sheet components
Cost-sensitive moderate exposures
Reasons to stop and review
Unqualified coastal or chloride exposure
Reducing acids without corrosion data
Substitution for 304 based only on appearance
Specifications that require 304 chemistry
Fabrication route
Protect properties through cutting, forming and welding
Rapid work hardening requires rigid tooling and positive feeds.
Springback and forming load can exceed expectations from mild steel.
Standard austenitic welding practices apply, but the procedure and filler must match the service.
Clean fabrication prevents iron contamination from masking the grade performance.
Supply definition
Product form changes the applicable requirements
Do not send an RFQ that names only the grade. State form, governing standard, dimensions, tolerances, finish, edge or end condition, quantity, certification and inspection.
Cold-rolled sheet and coil
Strip
Selected hot-rolled flat products
Fabricated components
Certificate checkpoint
Request heat identity, chemical analysis, mechanical results and compliance to the exact product specification. Add PMI, corrosion testing or supplementary examination only when the application requires it.
Interactive selection check
Test 201 against the controlling question
Procurement FAQ
Questions to close before placing the order
Is 201 stainless steel magnetic?
Normally low in the annealed condition; cold work can increase response
Can 201 replace another grade?
Only after checking the governing standard, composition, mechanical properties, corrosion exposure, fabrication route and certification. A commercial name is not a substitution approval.
Does the table apply to pipe, tube and bar?
Not automatically. The values shown use flat-product requirements as a reference. Other forms can use different product standards, dimensions and tests.
What should a 201 RFQ include?
Product form, standard and edition, UNS or EN designation, dimensions, tolerances, finish, quantity, service, fabrication, certificate and inspection requirements.
Sources, scope and RFQ
Use traceable grade data, then specify the actual product
ASTM A240/A240M flat-rolled composition and mechanical requirements
North American Stainless NAS 601 Type 201 technical datasheet
Outokumpu Core 201/4372 range data
worldstainless categories, grades and product-form guidance