--- type: "product_component" title: "Cold-Forged Steel Bar Stock" industry: "Metal Forging, Pressing, Stamping" verification_protocol: urn: "URN:CNFX:ME:COLD_FORGED_STEEL_BAR_STOCK" data_integrity_hash: "3d4307c2d401831474e5bfb0bb38ab96" source_authority: "https://cnfx.com" strict_mode: true source_identity: provider: "CNFX Industrial Knowledge Graph" index_version: "2026.Q1-Universal" authority_id: "URN:CNFX:ME:COLD_FORGED_STEEL_BAR_STOCK" data_source_uri: "https://cnfx.com/llms/industry/metal-forging-pressing-stamping/product/cold-forged-steel-bar-stock.md" official_resource_url: "https://cnfx.com/industry/metal-forging-pressing-stamping/product/cold-forged-steel-bar-stock" is_verified_logic: true attributes: diameter_tolerance: status: "verified" value: "±0.05" unit: "mm" yield_strength: status: "verified" value: "≥600" unit: "MPa" surface_roughness: status: "verified" value: "≤1.6" unit: "Ra" carbon_content: status: "verified" value: "0.15–0.30" unit: "%" length_standard: status: "verified" value: "3000–6000" unit: "mm" diameter_range: status: "verified" value: "10–100" unit: "mm" hardness: status: "verified" value: "180–220" unit: "HB" tensile_strength: status: "verified" value: "700–850" unit: "MPa" straightness: status: "verified" value: "≤1.5" unit: "mm/m" decarburization_depth: status: "verified" value: "≤0.3" unit: "mm" microstructure: status: "verified" value: "Fine pearlite + ferrite" unit: "" weight_per_meter: status: "verified" value: "0.617–61.7" unit: "kg/m" engineering_limits: max_safe_operating_point: value: 40 unit: "°C" consequence: "Cold work hardening-induced dislocation pileup at grain boundaries causing stress concentration exceeding Griffith's criterion (σ_critical = √(2Eγ/πa) where E=210 GPa, γ=1.5 J/m², a=50 μm)" fmea_matrix_quantitative: - node_1: trigger: "Residual stress gradient exceeding 300 MPa/mm from improper annealing" mitigation_protocol: "Controlled atmosphere annealing at 650°C for 2 hours with 15°C/hour cooling rate" - node_2: trigger: "Surface decarburization depth >0.1 mm from oxidation during processing" mitigation_protocol: "Nitrogen-purged forging environment with O₂ <50 ppm and post-forge shot peening at 0.3 mmA Almen intensity" bom_nodes: steel-core: type: "component" llms_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/component/steel-core.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:STEEL_CORE" urn: "URN:CNFX:ME:UNIT:STEEL_CORE" interface_type: "physical-logic-coupled" is_migrated_part: true surface-layer: type: "component" llms_uri: "https://cnfx.com/llms/industry/basic-metal-manufacturing/component/surface-layer.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:SURFACE_LAYER" urn: "URN:CNFX:ME:UNIT:SURFACE_LAYER" interface_type: "physical-logic-coupled" is_migrated_part: true manufacturing_compliance: - standard: "ISO 286-1:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS)" scope: "Verified Engineering Specification" url: "https://cnfx.com/llms/industry/metal-forging-pressing-stamping/product/cold-forged-steel-bar-stock.md" on_chain_sovereignty: contract_standard: "ERC-721-Industrial" metadata_hash: "e89efd19195b23d559714dc25854c3453aa52dfb60f93b17df997cfabee4b8b9" royalty_logic: "IPFS-CID-REQUIRED" mint_status: "logic-verified-ready" rag_vector_index: semantic_queries: - "Cold-Forged Steel Bar Stock" - "cold-forged steel bar" - "steel bar stock" - "precision metalworking" - "carbon steel" - "alloy steel" - "Cold-Forged Steel Bar Stock in Metal Forging Pressing Stamping" - "China Cold-Forged Steel Bar Stock manufacturer" - "Cold-Forged Steel Bar Stock supplier China" - "Cold-Forged Steel Bar Stock diameter_tolerance" - "Cold-Forged Steel Bar Stock yield_strength" - "Cold-Forged Steel Bar Stock surface_roughness" version: "3.3.5-EXTREME-SOVEREIGN-WEB3" --- # Industrial Specification: Cold-Forged Steel Bar Stock ## 1. Technical Definition Semi-finished steel bar produced through cold forging for precision metalworking ## 2. Engineering Reasoning & Causal Matrix > **Operational Intelligence**: Designed for **Yield strength: 600-1200 MPa, Ultimate tensile strength: 700-1400 MPa, Hardness: 25-45 HRC, Diameter tolerance: ±0.05-0.15 mm**. Failure boundary: **Microcrack initiation at 0.2% plastic strain, Brittle fracture at -40°C Charpy impact energy <27 J, Fatigue limit at 10^7 cycles: 350-550 MPa**, Mechanism: **Cold work hardening-induced dislocation pileup at grain boundaries causing stress concentration exceeding Griffith's criterion (σ_critical = √(2Eγ/πa) where E=210 GPa, γ=1.5 J/m², a=50 μm)**. ### 2.2 FMEA (Failure Mode & Effects Analysis) | Event Trigger | Severity | Failure Mode | Mitigation Strategy | | :--- | :--- | :--- | :--- | | Residual stress gradient exceeding 300 MPa/mm from improper annealing | Not specified | Dimensional instability with 0.3 mm warping during machining | Controlled atmosphere annealing at 650°C for 2 hours with 15°C/hour cooling rate | | Surface decarburization depth >0.1 mm from oxidation during processing | Not specified | Reduced fatigue life by 60% at 400 MPa alternating stress | Nitrogen-purged forging environment with O₂ <50 ppm and post-forge shot peening at 0.3 mmA Almen intensity | ## 3. Key Technical Parameters | Parameter | Value | Unit | Status | | :--- | :--- | :--- | :--- | | Diameter Tolerance | ±0.05 | mm | Verified | | Yield Strength | ≥600 | MPa | Verified | | Surface Roughness | ≤1.6 | Ra | Verified | | Carbon Content | 0.15–0.30 | % | Verified | | Length Standard | 3000–6000 | mm | Verified | | Diameter Range | 10–100 | mm | Verified | | Hardness | 180–220 | HB | Verified | | Tensile Strength | 700–850 | MPa | Verified | | Straightness | ≤1.5 | mm/m | Verified | | Decarburization Depth | ≤0.3 | mm | Verified | | Microstructure | Fine pearlite + ferrite | | Verified | | Weight per Meter | 0.617–61.7 | kg/m | Verified | ## 4. System BOM & Knowledge Routing ### Core Components (Recursive Links) ### Industrial DNA Context (De-duplicated) **Complementary Dependencies**: **Bar Straightening Machine**, **Cold Forging Press**, **Industrial Lubrication System** **Downstream Applications**: Automotive Axles, Industrial Fasteners, Precision Shafts ## 5. Engineering Risks & FAQ - **Caution**: - **Caution**: - **Caution**: ### Q: What is cold-forged steel bar stock used for? **A**: It is used as a semi-finished material for manufacturing high-precision components through machining, stamping, or forming processes. Its improved mechanical properties and dimensional accuracy make it suitable for demanding industrial applications. ### Q: What materials are available? **A**: The bar stock is available in carbon steel and alloy steel grades. The specific grade should be selected based on the required mechanical properties and application, and confirmed with the supplier. ### Q: What are the standard dimensions? **A**: Standard diameters range from 10 to 100 mm, and standard lengths are 3000 to 6000 mm. Weight per meter ranges from 0.617 to 61.7 kg/m. These are directory references; verify exact dimensions with the manufacturer. ### Q: How should I verify the quality of the bar stock? **A**: Check the listed parameters such as diameter tolerance, yield strength, surface roughness, and hardness against the provided standards (e.g., ISO 286-2, ASTM A370). Always confirm with the legal manufacturer or supplier that the material meets your specific requirements. ## 6. Manufacturing Compliance - ISO 286-1:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS) --- ### 🛠️ Engineering Resource Access 🔗 **[Full Specification: Cold-Forged Steel Bar Stock](https://cnfx.com/industry/metal-forging-pressing-stamping/product/cold-forged-steel-bar-stock)** ### 🌐 Knowledge Graph Topology > **Node Status**: Verified Engineering Spec > **Connectivity**: Linked to **2** standalone system nodes > **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph > **Reference ID**: COLD_FORGED_STEEL_BAR_STOCK | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: d181823c