SAE 4137 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 4137 is a through-hardening Cr-Mo alloy steel bridging 4130 and 4140, offering an excellent combination of strength, ductility, and fracture toughness for structural components.
Recognized Aliases
Source-backed commercial trade name and short designations cataloged in canonical data.
SAE 4137 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 | 4137 | Society of Automotive Engineers | —Ref: Practical Data for Metallurgists, 19th edition |
| AISI | 4137 | American Iron and Steel Institute | —Ref: Practical Data for Metallurgists, 19th edition |
| UNS | G41370 | Unified Numbering System | —Ref: Practical Data for Metallurgists, 19th edition |
| Standards Body | Specification Code | Specification Title / Scope | Relationship Type |
|---|---|---|---|
| SAE | SAE 4137 Alloy Steel Engineering Datasheet | Applicable specification reference. | Specification Reference |
SAE 4137 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 | 0.35 – 0.40 | 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 | 0.80 – 1.10 | wt% | Ref: Metallus | VERIFIED |
| Molybdenum | Mo | 42 | RANGE | 0.15 – 0.25 | wt% | Ref: Metallus | VERIFIED |
SAE 4137 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 4137 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 4137 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: ≥ 680 MPa (MINIMUM)ASTM A108 / ASTM E8Metallus — p118, Estimated Minimum Properties for Cold Drawn Bars Reduction of Area: ≥ 40 % (MINIMUM)ASTM A108 / ASTM E8Metallus — p118, Estimated Minimum Properties for Cold Drawn Bars | — | ≥ 680 MPa | — | — | — | — | — | VERIFIED |
| Bar | Normalized Bar (25 mm)Source values and qualifiersYield Strength: ≥ 440 MPa (MINIMUM)ASTM A108 / ASTM E8 (0.2% offset)Metallus — p118, Estimated Minimum Properties for Cold Drawn Bars | — | — | ≥ 440 MPa | — | — | — | — | VERIFIED |
| Bar | Normalized Bar (25 mm)Source values and qualifiersElongation at Break: ≥ 16 % (MINIMUM)ASTM A108 / ASTM E8Metallus — p118, Estimated Minimum Properties for Cold Drawn Bars | — · in 50 mm (2 in) | — | — | ≥ 16 % | — | — | — | VERIFIED |
| Bar | Normalized Bar (25 mm)Source values and qualifiersHB Hardness: ≤ 229 HB (TYPICAL)Metallus — p118, Estimated Minimum Properties for Cold Drawn Bars | — | — | — | — | — | — | ≤ 229 HB | VERIFIED |
SAE 4137 Alloy Steel Equivalent & Comparable Grades
Comparable Grades & Cross-References: Carefully classified cross-reference relationships for SAE 4137 Alloy Steel. Comparable does not mean equivalent.
| Related Material | Family | Relationship Classification | Metallurgical Notes & Differences | Status | Action |
|---|---|---|---|---|---|
| SAE 4140 Alloy Steel | Steel | Commonly Compared | Direct predecessor to 4140 with slightly lower carbon (0.35-0.40% C) offering higher impact toughness at elevated tensile strength.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost). | VERIFIED | Side-by-Side Compare → |
Chromium-Molybdenum Alloy Steel Cluster (41xx Series)
High-strength Cr-Mo alloys providing deep hardenability, high fatigue strength, and impact toughness across elevated stress applications.
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.