Injection Molding
Tooling and molding for your repeat plastic parts.
410 · 440C · 321 · 904L · 2507
Other Stainless Grades for Your Custom Parts
Bring the requirement that your usual grade does not resolve.
For specialty stainless steel machining, connect your specified alloy, material condition and actual service environment to the drawing. Feasibility and the manufacturing route are reviewed for your component.
3 Routes Into Your Material Review
For custom stainless steel alloy parts, start with the feature and environment that control acceptance. Stainless steel grade selection services here support your manufacturing inquiry; the final specified material remains a controlled design decision.
Hardness & wear
410 / 440C: discuss final hardness, distortion and finishing allowance. Review hardenable grades ↓
Heat & fabrication
321: relate stabilization, temperature, joining and dimensional acceptance. Review stabilized austenitic material ↓
Demanding exposure
904L / 2507: provide the medium, temperature, crevices and fabrication route. Review exposure inputs ↓
5 Grade Names for Your International Drawing Package
| Grade | UNS identifier | Common European correspondence | Family / purchase check |
|---|---|---|---|
| 410 | UNS S41000 | EN 1.4006 · X12Cr13 | Martensitic; state supplied and final condition. |
| 440C | UNS S44004 | EN 1.4125 · X105CrMo17 | High-carbon martensitic; keep final hardness and finish explicit. |
| 321 | UNS S32100 | EN 1.4541 · X6CrNiTi18-10 | Titanium-stabilized austenitic; distinguish 321 from 321H. |
| 904L | UNS N08904 | EN 1.4539 | High-alloy austenitic; retain N08904, not an assumed S-prefix. |
| 2507 duplex stainless steel | UNS S32750 | EN 1.4410 · X2CrNiMoN25-7-4 | Super duplex; do not infer interchangeability with other duplex grades. |
These names assist global lookup, not automatic contractual substitution. Keep standard revision, product form, condition and the actual material record. 410 source → · 440C source → · 321 source → · 904L source → · 2507 source →
410 & 440C: Release the Final Condition With Your Geometry
For 410 stainless steel machining and custom 410 stainless steel parts, define the supplied condition, final properties and sequence around 410 stainless steel heat treatment.
For 410 stainless steel shafts, connect bearing lands, keyways and runout requirements to the final inspection state.
For 440C stainless steel machining and custom 440C stainless steel parts, review the condition before and after 440C stainless steel heat treatment. Plan 440C stainless steel grinding or other final finishing where the drawing requires it.
For custom components used in 440C stainless steel bearings, provide the component drawing, wear surfaces and acceptance. A material name does not qualify an assembled bearing.
For 410 stainless steel passivation, agree cleaning, compatibility and evidence with the final condition.
Turning Review → · Surface Review →
Read the Composition Basis Before Comparing Percentages
321 / 904L / 2507: Typical Chromium
Outokumpu supplier typical chemistry · mass % · axis 0–30%
321 / 1.454117.3%
904L / 1.453919.8%
2507 / 1.441025.0%
410 / 440C: Chromium Reference Ranges
Atlas bar-product references · mass % · axis 0–20%
410 · 2021 reference11.5–13.5%
440C · 2008 reference16–18%
Carbon reference ranges: 410 0.08–0.15%; 440C 0.95–1.20%.
| Selected typical chemistry · mass % | C | Cr | Ni | Mo | Other selected value |
|---|---|---|---|---|---|
| Core 321 / 4541 | 0.04 | 17.3 | 9.1 | Not tabulated | Titanium stabilized |
| Ultra 904L | 0.01 | 19.8 | 24.2 | 4.3 | Cu 1.4 |
| Forta SDX 2507 | 0.02 | 25.0 | 7.0 | 4.0 | N 0.27 |
The two graphics use different stated datasets: supplier typical chemistry and Atlas reference ranges. They are intentionally separated. Omitted elements remain subject to your complete material specification.
321: Connect Your Thermal Duty to the Joined Component
For 321 stainless steel machining, state product form, condition and the feature that controls assembly. 321 stainless steel machinability depends on the actual material, setup and cut.
For 321 stainless steel exhaust components, provide operating temperature, cycling, mounting and joining requirements. An exhaust label alone does not validate the design.
For 321 stainless steel welding, review joint access, filler and procedure requirements, distortion and final cleaning. Keep 321 and 321H distinct in the material callout.
Welding & Fabrication →
904L: Describe the Chemical Duty Before Comparing Cost
For 904L stainless steel machining, identify bores, seals, threads and machining access together with the specified stock condition.
For 904L stainless steel chemical equipment parts, state medium, concentration, temperature, cleaning and retained-fluid locations. Do not treat the grade as suitable for every chemical environment.
For 904L stainless steel welding, agree the joining procedure, surface treatment and evidence required for the finished assembly.
CNC Milling → · Surface Finishing Review →
2507: Carry Your Super Duplex Requirement Through Fabrication
For 2507 stainless steel machining, define the exact stock form, UNS designation and final inspection state. The super duplex family name alone does not release a component.
For 2507 stainless steel welding, review the procedure, thermal route and required final material-condition evidence before manufacture.
Keep the service exposure, loaded interfaces and any application-specific qualification explicit.
2205 Duplex Material Guide → · Material Traceability →
Turn Your Grade Request Into a Reviewable Machining Scope
Identify the functional faces, datum relationships, thread engagement and inspection access for your component. Include supplied condition and any later heat treatment or joining.
For an unlisted grade, send the full designation and specification rather than a visually similar stock sample. Feasibility, procurement and the proposed process are confirmed against the actual drawing.
Material first
Grade, standard, product form and condition.
Final geometry
Fits, runout, thin sections and finishing allowance.
4 Checks for Your Unusual Material Requirement
01 · Final hardness
Specify final hardness with the exact grade
State hardness, test location and dimensional acceptance after the complete thermal route.
Identify the thermal route, test method and location. Keep dimensional acceptance after the complete route with the drawing.
0.95–1.20%440C carbon · mass % · historical supplier range
Atlas May 2008 440C reference; not a current purchased specification or a universal hardness guarantee.
Read the source and conditions →
02 · Joint & heat path
Treat the joint and heat route as one decision
Define the joint, thermal duty, cleaning and final inspection state.
Show weld access, distortion-sensitive dimensions and the required final condition. Identify whether a stabilized austenitic grade is required.
1.4541321 European correspondence · UNS S32100
321 is titanium stabilized; do not infer the 321H variant or a qualified high-temperature joint from the name.
Read the source and conditions →
03 · Fluid & crevices
Show the medium, crevice and drainage condition
Identify the medium, temperature, sealing surfaces and trapped-fluid locations.
Identify the actual fluid, concentration, temperature and cleaning access. Review high-alloy alternatives against the full service requirement.
4.3%904L molybdenum · supplier typical mass %
Outokumpu Ultra 904L selected chemistry; not a universal acid-resistance guarantee or a test of the illustrated block.
Read the source and conditions →
04 · Finishing allowance
Connect final finishing to the chosen alloy
Relate grinding, polishing or surface treatment to final fits and datums.
Identify which bore, seal land or mating face needs final finishing. Agree stock and inspection after the complete manufacturing route.
25 / 4%2507 chromium / molybdenum · typical mass %
Outokumpu Forta 2507 selected chemistry; not a machining allowance or interchangeable approval for 2205.
Read the source and conditions →Make Your Evidence Requirements Part of the Order
Identity
Grade, standard, condition and material record.
Geometry
Datums, fits and final measurement state.
Special processing
Required thermal, joining or surface evidence.
Release
Revision, exceptions, traceability and protection.
Find Your Existing Grade Guide Without Repeating the Search
Use the detailed guide for a listed grade. This page supports additional material requests and does not imply stock availability or approval of every manufacturing route.
5 Inputs for a Comparable Specialty-Material Quote
Material
Exact designation, specification and form.
Condition
Supplied state and required final properties.
Geometry
Machining, joints and final finishing.
Service
Load, medium, temperature and cleaning.
Release
Quantity, inspection, records and packing.
Your Questions Before Releasing an Additional Grade
410 vs 304 stainless steel: what should you compare?
Compare final material condition, hardness needs, joining and actual exposure. They belong to different families; do not substitute from appearance alone.
440C vs 316 stainless steel: which fits your part?
Define wear surfaces, final hardness and corrosion duty. The heat-treated martensitic and austenitic routes serve different requirements.
321 vs 304 stainless steel: what changes the choice?
Review stabilization needs, thermal duty, product form and joining requirements. Keep the exact grade and condition in the drawing.
904L vs 316 stainless steel: is more alloy always better?
Compare the actual medium, temperature, cleaning, fabrication and total finished scope. A composition percentage alone does not qualify service.
2507 vs 316 stainless steel: can you substitute?
Review environment, strength, fabrication controls and application-specific acceptance. Neither name is automatic approval for the other.
Is 440C stainless steel magnetic?
Yes. It is a martensitic grade with a magnetic response. A magnet alone does not verify the full grade, condition or certification.
Can 321 stainless steel be heat treated?
Its thermal processing includes solution or stabilization treatments as applicable. Do not specify a martensitic hardening route merely to obtain an assumed hardness; agree the required properties and procedure.
What if your stainless grade is not listed?
Send the complete grade name, standard, form, condition and drawing. The material supply and manufacturing feasibility must be reviewed before commitment.
6 Inputs for Your Specialty Stainless Steel Review
Drawing
Controlled revision and CAD.
Material
Grade, standard and product form.
Condition
Supplied state, final hardness or properties.
Environment
Medium, temperature, cycling and load.
Manufacturing
Fits, threads, welds and surface restrictions.
Release
Quantities, records, acceptance and packing.
