321 Stainless Steel
Mat Grades internal verification confirms source-backed fidelity and data integrity. It does not constitute external certification, ASTM/CDA endorsement, or guaranteed material conformity for procurement.
Key Engineering Properties
Representative source rows, qualified by their reported conditions. Inspect the tables below for all values, limits, and source notes.
Engineering Summary
321 Stainless Steel. Source-scoped engineering data is shown with its reported limits and conditions. Unreported properties are not inferred.
Recognized Aliases
Source-backed commercial trade name and short designations cataloged in canonical data.
Standard Designations & Applicable Specifications
Semantically classified designations distinguishing primary standard identifiers, commercial trade names, and applicable specification references.
| System | Identifier | Standard System Name | Classification Notes & Provenance |
|---|---|---|---|
| TYPEPRIMARY | 321 | Producer-referenced stainless type | —Ref: Practical Data for Metallurgists, 19th edition |
| Standards Body | Specification Code | Specification Title / Scope | Relationship Type |
|---|---|---|---|
| 321 | 321 Stainless Steel Engineering Datasheet | Applicable specification reference. | Specification Reference |
Chemical Composition (Weight %)
Elemental limits and values from the cited source. Preserves exact semantic limits (minimums, maximums, and ranges).
| Element | Symbol | Atomic No. | Semantic Basis | Specified Value | Unit | Metallurgical Notes & Qualification | Data Status |
|---|---|---|---|---|---|---|---|
| Carbon | C | 6 | MAXIMUM | ≤ 0.08 | wt% | Source cell: .08max. Scope: p23, Type 321.Ref: Metallus | VERIFIED |
| Manganese | Mn | 25 | MAXIMUM | ≤ 2.00 | wt% | Source cell: 2.00max. Scope: p23, Type 321.Ref: Metallus | VERIFIED |
| Silicon | Si | 14 | MAXIMUM | ≤ 1.00 | wt% | Source cell: 1.00max. Scope: p23, Type 321.Ref: Metallus | VERIFIED |
| Phosphorus | P | 15 | MAXIMUM | ≤ 0.04 | wt% | Source cell: .045max. Scope: p23, Type 321.Ref: Metallus | VERIFIED |
| Sulfur | S | 16 | MAXIMUM | ≤ 0.03 | wt% | Source cell: .030max. Scope: p23, Type 321.Ref: Metallus | VERIFIED |
| Chromium | Cr | 24 | RANGE | 17.00 – 19.00 | wt% | Source cell: 17.00/19.00. Scope: p23, Type 321.Ref: Metallus | VERIFIED |
| Nickel | Ni | 28 | RANGE | 9.00 – 12.00 | wt% | Source cell: 9.00/12.00. Scope: p23, Type 321.Ref: Metallus | VERIFIED |
| Titanium | Ti | 22 | MAXIMUM | ≥ 5 × (C); ≤ 0.6 | wt% | Source requires Ti at least 5 × C and at most 0.60 wt%; the carbon-dependent minimum is not evaluated at the carbon maximum.Ref: Metallus | VERIFIED |
Physical Properties
Source-specific physical properties. Test temperatures are shown only where reported.
| Property Parameter | Canonical SI Value | Semantic Basis | Test Temperature / Context Range | Source Raw Reference | Source Reference | Status |
|---|---|---|---|---|---|---|
| Density | 7.9 g/cm³ | TYPICAL | 7.90 g/cm3 | ATI (Allegheny Technologies Incorporated) | VERIFIED | |
| Elastic Modulus | 193 GPa | TYPICAL | 193 GPa | ATI (Allegheny Technologies Incorporated) | VERIFIED |
Thermal & Thermodynamic Properties
Phase change temperatures, thermal conductivity, specific heat, mean coefficients of thermal expansion across standardized temperature ranges, and recommended thermal processing windows.
| Property Parameter | Canonical SI Value | Semantic Basis | Test Temperature / Context Range | Source Raw Reference | Source Reference | Status |
|---|---|---|---|---|---|---|
| Coefficient of Thermal Expansion | 16.6 µm/(m·K) | TYPICAL | Test Temp: 100 °C | 16.6 10^-6/K | ATI (Allegheny Technologies Incorporated) | VERIFIED |
| Thermal Conductivity | 16.1 W/(m·K) | TYPICAL | Test Temp: 100 °C | 16.1 W/(m·K) | ATI (Allegheny Technologies Incorporated) | VERIFIED |
Electrical Properties
Electrical conductivity and resistivity in their reported units and conditions.
| Property Parameter | Canonical SI Value | Semantic Basis | Test Temperature / Context Range | Source Raw Reference | Source Reference | Status |
|---|---|---|---|---|---|---|
| Electrical Resistivity | 720 nΩ·m | TYPICAL | 72 µΩ·cm | ATI (Allegheny Technologies Incorporated) | VERIFIED |
Contextual Mechanical Properties & Tempers
Engineering strength, ductility, and hardness values grouped by product form, temper, and section thickness. Mechanical properties are contextual and not isotropic averages.
| Product Form | Temper / Condition | Section Size | Tensile (UTS) | Yield Strength | Elongation | Shear Strength | Fatigue Strength | Hardness (Scales Preserved) | Status |
|---|---|---|---|---|---|---|---|---|---|
| Plate, Sheet and Strip | Annealed · AnnealedSource values and qualifiersUltimate Tensile Strength: ≥ 515 MPa (MINIMUM)ASTM A240ATI (Allegheny Technologies Incorporated) — ATI 321 Datasheet, Mechanical Properties Table | — | ≥ 515 MPa | — | — | — | — | — | VERIFIED |
| Plate, Sheet and Strip | Annealed · AnnealedSource values and qualifiersYield Strength: ≥ 205 MPa (MINIMUM)ASTM A240 (0.2% offset)ATI (Allegheny Technologies Incorporated) — ATI 321 Datasheet, Mechanical Properties Table | — | — | ≥ 205 MPa | — | — | — | — | VERIFIED |
| Plate, Sheet and Strip | Annealed · AnnealedSource values and qualifiersElongation at Break: ≥ 40 % (MINIMUM)ASTM A240ATI (Allegheny Technologies Incorporated) — ATI 321 Datasheet, Mechanical Properties Table | — · in 50 mm (2 in) | — | — | ≥ 40 % | — | — | — | VERIFIED |
| Plate, Sheet and Strip | AnnealedSource values and qualifiersHRB Hardness: ≤ 95 HRB (MAXIMUM)ATI (Allegheny Technologies Incorporated) — ATI 321 Datasheet, Mechanical Properties Table | — | — | — | — | — | — | ≤ 95 HRB | VERIFIED |
Sources & Provenance Trail
Reference publications and standards organization registers cited across this material record.
Reviewed factual transcription; source document SHA-256 is recorded in the capture metadata. No cross-standard equivalence is asserted.
Reviewed factual transcription from primary producer engineering datasheet.
Reviewed factual transcription from primary producer engineering datasheet.
Reviewed factual transcription from primary producer engineering datasheet.
Reviewed factual transcription from primary producer engineering datasheet.
Reviewed factual transcription from primary producer engineering datasheet.