---
title: "Catalyst Canning / Housing"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:CATALYST_CANNING_HOUSING"
  data_integrity_hash: "43e90c1c7a665d62cb089130f6e38057"
  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:CATALYST_CANNING_HOUSING"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/catalyst-canning-housing.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/catalyst-canning-housing"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-15 bar internal pressure, -40°C to 650°C temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 18
    unit: "bar"
    consequence: "Thermal-mechanical fatigue from cyclic thermal expansion mismatch between 409 stainless steel housing (CTE 10.8 μm/m·K) and ceramic substrate (CTE 5.3 μm/m·K), combined with creep deformation at sustained temperatures above 600°C"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Thermal cycling exceeding 300°C/min rate"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Finite element analysis-optimized weld geometry with 2.5 mm fillet radius and post-weld heat treatment at 850°C for 2 hours"
  - node_2:
      trigger: "Condensate acid accumulation (pH &lt; 3.5) from sulfur in fuel"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "316L stainless steel construction with 3.0% molybdenum content and cathodic protection using zinc sacrificial anodes"
bom_nodes:
  outer-shell:
    type: "component"
    urn: "URN:CNFX:ME:OUTER_SHELL"
    interface_type: "physical-logic-coupled"
  insulation-layer:
    type: "component"
    urn: "URN:CNFX:ME:INSULATION_LAYER"
    interface_type: "physical-logic-coupled"
  mounting-flanges:
    type: "component"
    urn: "URN:CNFX:ME:MOUNTING_FLANGES"
    interface_type: "physical-logic-coupled"
  retention-system:
    type: "component"
    urn: "URN:CNFX:ME:RETENTION_SYSTEM"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "CE MARKING - PRESSURE EQUIPMENT DIRECTIVE (PED) 2014/68/EU"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/catalyst-canning-housing.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "47fbcc9c47d5caa250d5d28f732f6533072020cbd43ffe331c3ed94b75982c98"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Catalyst Canning / Housing

## 1. Technical Definition
The protective metal enclosure that contains and supports the SCR catalyst substrate within the exhaust system.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-15 bar internal pressure, -40°C to 650°C temperature**. Failure boundary: **18 bar internal pressure causing permanent deformation, 700°C causing material yield strength reduction below 150 MPa**, Mechanism: **Thermal-mechanical fatigue from cyclic thermal expansion mismatch between 409 stainless steel housing (CTE 10.8 μm/m·K) and ceramic substrate (CTE 5.3 μm/m·K), combined with creep deformation at sustained temperatures above 600°C**.

### 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 |
| :--- | :--- | :--- | :--- |
| Thermal cycling exceeding 300°C/min rate | 8 | Weld seam fatigue cracking leading to exhaust gas leakage | Finite element analysis-optimized weld geometry with 2.5 mm fillet radius and post-weld heat treatment at 850°C for 2 hours |
| Condensate acid accumulation (pH &lt; 3.5) from sulfur in fuel | 8 | Pitting corrosion at 0.5 mm/year rate causing wall penetration | 316L stainless steel construction with 3.0% molybdenum content and cathodic protection using zinc sacrificial anodes |

## 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**: **Welding Robot System**, **Automated Press Brake**, **Laser Cutting Machine**  
**Downstream Applications**: SCR Catalyst Assembly, Exhaust System Module, Complete Exhaust Aftertreatment System  

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

### Q: What materials are used in catalyst canning for motor vehicle SCR systems?
**A**: Catalyst canning typically uses stainless steel (Grade 409 or 304), aluminized steel for the outer shell, and ceramic fiber insulation mats to protect the SCR catalyst substrate from thermal and mechanical stress.

### Q: How does the insulation layer in catalyst housing improve SCR system performance?
**A**: The ceramic fiber insulation mat maintains optimal operating temperatures for the SCR catalyst, improves conversion efficiency of NOx emissions, and protects surrounding components from excessive heat.

### Q: What are the key components in a catalyst canning BOM for automotive applications?
**A**: The bill of materials includes the outer shell (stainless or aluminized steel), insulation layer (ceramic fiber), mounting flanges for system integration, and a retention system to secure the catalyst substrate.

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

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Catalyst Canning / Housing](https://cnfx.com/industry/motor-vehicle-manufacturing/product/catalyst-canning-housing)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: CATALYST_CANNING_HOUSING | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 2db58b76
