Grade dossier
305 Stainless Steel for Deep Drawing and Severe Forming
A higher-nickel austenitic grade engineered for lower work-hardening rate and improved deep drawability in demanding forming operations.
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 | 0.12 max |
|---|---|
| Mn | 2.00 max |
| Si | 0.75 max |
| P | 0.045 max |
| S | 0.030 max |
| Cr | 17.00-19.00 |
| Ni | 10.50-13.00 |
Properties with context
Minimums, typical indicators and delivered condition
Specified annealed flat-product values
| Tensile strength | 485 MPa min |
|---|---|
| 0.2% yield strength | 170 MPa min |
| Elongation | 40% min |
| Hardness | 88 HRBW max |
Selection indicators
| Density | about 7.9 g/cm3 |
|---|---|
| Formability | Excellent deep drawability |
| Work hardening | Lower than 304 and 301 |
| Heat treatment | Not hardened by thermal treatment |
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 305 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
Deep-drawn shells and housings
Multi-stage formed components
Sinks and complex stampings
Parts that must remain weakly magnetic after forming
Reasons to stop and review
Paying for 305 when ordinary 304 forming is sufficient
High-chloride service without corrosion review
RFQs that omit draw depth, blank direction and lubricant constraints
Confusing 305 with 308 or EN equivalents by number alone
Fabrication route
Protect properties through cutting, forming and welding
Use forming trials to set blank geometry, lubrication and draw schedule.
Lower work hardening helps multi-stage drawing but does not remove springback.
Protect appearance surfaces through tooling and interstage handling.
Specify final anneal, temper and magnetic-response requirements if relevant.
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.
Hot- and cold-rolled sheet and coil
Precision strip
Deep-drawing blanks
Formed shells, sinks and complex stampings
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.
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Interactive selection check
Test 305 against the controlling question
Procurement FAQ
Questions to close before placing the order
Is 305 stainless steel magnetic?
Low, including after more severe cold work than many 18-8 grades
Can 305 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 every product form?
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 305 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
ATI 305 technical data for UNS S30500
ASTM A240/A240M flat-product requirements
Outokumpu Core 305/4303 product data
Carpenter cold-forming alloy-selection guidance