---
title: "Barrel"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:BARREL"
  data_integrity_hash: "e137cca9cb9c61cf2a3745bb78027250"
  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:BARREL"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/barrel.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/barrel"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-550 MPa internal pressure, 15-1200°C temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 620
    unit: "MPa"
    consequence: "Lüders band propagation from cyclic plastic deformation at stress concentrations exceeding 0.2% proof stress"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Carbon migration at 900°C barrel-wall interface during sustained fire"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Chromium nitride coating (≥15μm) with 0.3% nitrogen diffusion barrier"
  - node_2:
      trigger: "Erosive wear from copper jacket ablation at 850 m/s projectile velocity"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Electrolytic bore plating with 92% tungsten carbide matrix"
bom_nodes:
  chamber:
    type: "component"
    urn: "URN:CNFX:ME:CHAMBER"
    interface_type: "physical-logic-coupled"
  bore:
    type: "component"
    urn: "URN:CNFX:ME:BORE"
    interface_type: "physical-logic-coupled"
  rifling-grooves-lands:
    type: "component"
    urn: "URN:CNFX:ME:RIFLING_GROOVES_LANDS"
    interface_type: "physical-logic-coupled"
  muzzle-crown:
    type: "component"
    urn: "URN:CNFX:ME:MUZZLE_CROWN"
    interface_type: "physical-logic-coupled"
  barrel-extension-lugs:
    type: "component"
    urn: "URN:CNFX:ME:BARREL_EXTENSION_LUGS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "CE MARKING - CONFORMITY WITH EU DIRECTIVES FOR PRESSURE EQUIPMENT (PED 2014/68/EU)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/barrel.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "e9036dd712ba44662ab6babcaf0e8619f33f0d4ef86a51006d384443cb917448"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Barrel

## 1. Technical Definition
The cylindrical component of a firearm through which the projectile travels when fired.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-550 MPa internal pressure, 15-1200°C temperature**. Failure boundary: **Yield strength exceedance at 620 MPa or 1300°C thermal softening threshold**, Mechanism: **Lüders band propagation from cyclic plastic deformation at stress concentrations exceeding 0.2% proof stress**.

### 2.1 Analytical Physics Model
Governed by the **Thin-Wall Pressure Vessel Stress Analysis**:

> **Primary Equation**: $\sigma_h = \frac{P \cdot D}{2t}$  
> **Engineering Impact**: Determines the hoop stress boundary to prevent rupture.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| P | Internal Pressure | Engineering Constant |
| D | Diameter | Engineering Constant |
| t | Wall Thickness | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Carbon migration at 900°C barrel-wall interface during sustained fire | 8 | Embrittlement-induced radial fracture at chamber-throat transition | Chromium nitride coating (≥15μm) with 0.3% nitrogen diffusion barrier |
| Erosive wear from copper jacket ablation at 850 m/s projectile velocity | 8 | Bore diameter expansion beyond +0.15mm tolerance at forcing cone | Electrolytic bore plating with 92% tungsten carbide matrix |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **CNC Lathe**, **Deep Hole Drilling Machine**, **Barrel Rifling Machine**  
**Downstream Applications**: Rifles, Pistols, Shotguns  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What are the advantages of chrome-molybdenum steel barrels?
**A**: Chrome-molybdenum steel barrels (like 4140/4150 grades) offer excellent strength-to-weight ratio, heat resistance, and durability, making them ideal for high-pressure firearm applications in machinery manufacturing.

### Q: How does rifling affect barrel performance?
**A**: Rifling (grooves and lands) imparts spin to projectiles, stabilizing their flight for improved accuracy. The specific rifling pattern and twist rate are critical specifications in barrel manufacturing for consistent performance.

### Q: What maintenance do stainless steel barrels require?
**A**: Stainless steel barrels (such as 416R) offer superior corrosion resistance but still require regular cleaning to prevent fouling buildup in the bore and chamber, ensuring long-term accuracy and reliability.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS
- CE MARKING - CONFORMITY WITH EU DIRECTIVES FOR PRESSURE EQUIPMENT (PED 2014/68/EU)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Barrel](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/barrel)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **5** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: BARREL | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 4133c51c
