SAE 8622 Alloy Steel
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Key Engineering Properties
Representative source rows, qualified by their reported conditions. Inspect the tables below for all values, limits, and source notes.
Engineering Summary
SAE 8622 is a higher carbon Ni-Cr-Mo carburizing steel offering increased core yield and tensile strength for transmission gears, ring gears, and differential pinions.
Recognized Aliases
Source-backed commercial trade name and short designations cataloged in canonical data.
SAE 8622 Alloy Steel Specifications & Designations
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 |
|---|---|---|---|
| SAEPRIMARY | 8622 | Society of Automotive Engineers | —Ref: Practical Data for Metallurgists, 19th edition |
| AISI | 8622 | American Iron and Steel Institute | —Ref: Practical Data for Metallurgists, 19th edition |
| UNS | G86220 | Unified Numbering System | —Ref: Practical Data for Metallurgists, 19th edition |
| Standards Body | Specification Code | Specification Title / Scope | Relationship Type |
|---|---|---|---|
| SAE | SAE 8622 Alloy Steel Engineering Datasheet | Applicable specification reference. | Specification Reference |
SAE 8622 Alloy Steel Chemical Composition
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 |
|---|---|---|---|---|---|---|---|
| Iron | Fe | 26 | BALANCE | Balance | wt% | Ref: Metallus | VERIFIED |
| Carbon | C | 6 | RANGE | 0.20 – 0.25 | wt% | Ref: Metallus | VERIFIED |
| Manganese | Mn | 25 | RANGE | 0.70 – 0.90 | wt% | Ref: Metallus | VERIFIED |
| Phosphorus | P | 15 | MAXIMUM | ≤ 0.03 | wt% | Ref: Metallus | VERIFIED |
| Sulfur | S | 16 | MAXIMUM | ≤ 0.04 | wt% | Ref: Metallus | VERIFIED |
| Silicon | Si | 14 | RANGE | 0.15 – 0.35 | wt% | Ref: Metallus | VERIFIED |
| Chromium | Cr | 24 | RANGE | 0.40 – 0.60 | wt% | Ref: Metallus | VERIFIED |
| Nickel | Ni | 28 | RANGE | 0.40 – 0.70 | wt% | Ref: Metallus | VERIFIED |
| Molybdenum | Mo | 42 | RANGE | 0.15 – 0.25 | wt% | Ref: Metallus | VERIFIED |
SAE 8622 Alloy Steel 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 | 7.85 g/cm³ | TYPICAL | 7.85 g/cm³ | Metallus | VERIFIED | |
| Elastic Modulus | 205 GPa | TYPICAL | 205 GPa | Metallus | VERIFIED | |
| Poisson's Ratio | 0.29 dimensionless | TYPICAL | 0.29 dimensionless | Metallus | VERIFIED |
SAE 8622 Alloy Steel 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 |
|---|---|---|---|---|---|---|
| Specific Heat Capacity | 486 J/(kg·K) | TYPICAL | 486 J/(kg·K) | Metallus | VERIFIED | |
| Thermal Conductivity | 42.6 W/(m·K) | TYPICAL | 42.6 W/(m·K) | Metallus | VERIFIED |
SAE 8622 Alloy Steel Mechanical Properties
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 |
|---|---|---|---|---|---|---|---|---|---|
| Bar | Normalized Bar (25 mm)Source values and qualifiersUltimate Tensile Strength: ≥ 590 MPa (MINIMUM)ASTM A108 / ASTM E8Metallus — p118, Estimated Minimum Properties for Cold Drawn Bars Reduction of Area: ≥ 45 % (MINIMUM)ASTM A108 / ASTM E8Metallus — p118, Estimated Minimum Properties for Cold Drawn Bars | — | ≥ 590 MPa | — | — | — | — | — | VERIFIED |
| Bar | Normalized Bar (25 mm)Source values and qualifiersYield Strength: ≥ 390 MPa (MINIMUM)ASTM A108 / ASTM E8 (0.2% offset)Metallus — p118, Estimated Minimum Properties for Cold Drawn Bars | — | — | ≥ 390 MPa | — | — | — | — | VERIFIED |
| Bar | Normalized Bar (25 mm)Source values and qualifiersElongation at Break: ≥ 19 % (MINIMUM)ASTM A108 / ASTM E8Metallus — p118, Estimated Minimum Properties for Cold Drawn Bars | — · in 50 mm (2 in) | — | — | ≥ 19 % | — | — | — | VERIFIED |
| Bar | Normalized Bar (25 mm)Source values and qualifiersHB Hardness: ≤ 201 HB (TYPICAL)Metallus — p118, Estimated Minimum Properties for Cold Drawn Bars | — | — | — | — | — | — | ≤ 201 HB | VERIFIED |
SAE 8622 Alloy Steel Equivalent & Comparable Grades
Comparable Grades & Cross-References: Carefully classified cross-reference relationships for SAE 8622 Alloy Steel. Comparable does not mean equivalent.
| Related Material | Family | Relationship Classification | Metallurgical Notes & Differences | Status | Action |
|---|---|---|---|---|---|
| SAE 8620 Alloy Steel | Steel | Commonly Compared | Higher carbon companion to 8620 for increased core strength in heavy-duty automotive drive gears and transmission components.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost). | VERIFIED | Side-by-Side Compare → |
Nickel-Chromium-Molybdenum Alloy Steel Cluster (43xx & 86xx Series)
Triple-alloy Ni-Cr-Mo steels engineered for high core toughness and predictable hardenability in heavy-duty transmission components.
Sources
Sources & Provenance Trail: Authoritative reference publications, standards specifications, and data registers cited across this material record.
Reviewed factual transcription from primary producer engineering technical literature.
Reviewed factual transcription from primary producer engineering technical literature.
Reviewed factual transcription from primary producer engineering technical literature.
Reviewed factual transcription from primary producer engineering technical literature.