---
type: "product_component"
title: "Cold-Forged Steel Bar Stock"
industry: "Metal Forging, Pressing, Stamping"
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    typical_range: "Yield strength: 600-1200 MPa, Ultimate tensile strength: 700-1400 MPa, Hardness: 25-45 HRC, Diameter tolerance: ±0.05-0.15 mm"
    unit: "mm"
  secondary_spec:
    status: "config-dependent"
    typical_range: "Yield strength: 600-1200 MPa, Ultimate tensile strength: 700-1400 MPa, Hardness: 25-45 HRC, Diameter tolerance: ±0.05-0.15 mm"
    unit: "MPa"
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)"
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      trigger: "Residual stress gradient exceeding 300 MPa/mm from improper annealing"
      severity: 8
      occurrence: 3
      detection: 4
      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"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Nitrogen-purged forging environment with O₂ <50 ppm and post-forge shot peening at 0.3 mmA Almen intensity"
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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"
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    - "cold forged steel bars for industrial pressing applications"
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    - "Cold-Forged Steel Bar Stock secondary_spec"

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---

# 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 &lt;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 | 8 | 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 &gt;0.1 mm from oxidation during processing | 8 | Reduced fatigue life by 60% at 400 MPa alternating stress | Nitrogen-purged forging environment with O₂ &lt;50 ppm and post-forge shot peening at 0.3 mmA Almen intensity |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| primary_spec | Config-dependent | mm | Verified |
| secondary_spec | Config-dependent | MPa | 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 are the advantages of cold-forged steel bar stock over hot-forged alternatives?
**A**: Cold-forged steel bar stock offers superior dimensional accuracy, tighter diameter tolerances, improved surface finish with lower Ra values, and enhanced mechanical properties like higher yield strength due to work hardening during the cold forging process.

### Q: What carbon content ranges are available for cold-forged steel bar stock?
**A**: Our cold-forged steel bar stock is available in various carbon content percentages, typically ranging from low-carbon steels (0.05-0.25%) for formability to medium/high-carbon steels (0.30-0.60%) for strength, with alloy steel options offering additional properties through elements like chromium, nickel, or molybdenum.

### Q: What are the typical diameter tolerance and surface roughness specifications?
**A**: Cold-forged steel bar stock features tight diameter tolerances, typically within ±0.1mm to ±0.5mm depending on size, and excellent surface roughness with Ra values generally between 1.6-6.3μm, making it ideal for precision metalworking without extensive secondary machining.

## 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