---
title: "Structural Hollow Section Steel"
industry: "Manufacture of Structural Metal Products"
verification_protocol:
  urn: "URN:CNFX:ME:STRUCTURAL_HOLLOW_SECTION_STEEL"
  data_integrity_hash: "29a6cc953774ffd287b83e693f1de8c7"
  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:STRUCTURAL_HOLLOW_SECTION_STEEL"
  data_source_uri: "https://cnfx.com/llms/industry/manufacture-structural-metal-products/product/structural-hollow-section-steel.md"
  official_resource_url: "https://cnfx.com/industry/manufacture-structural-metal-products/product/structural-hollow-section-steel"
  is_verified_logic: true
attributes:
  section_size_range:
    status: "config-dependent"
    typical_range: "Yield strength: 235-460 MPa, Temperature: -40°C to 400°C, Wall thickness: 1.6-25.4 mm"
    unit: "mm"
  cross_section_shape:
    status: "config-dependent"
    typical_range: "Yield strength: 235-460 MPa, Temperature: -40°C to 400°C, Wall thickness: 1.6-25.4 mm"
    unit: "shape type"
engineering_limits:
  max_safe_operating_point:
    value: "N/A"
    unit: "N/A"
    consequence: "Plastic hinge formation at yield stress σ_y, Brittle fracture at Charpy V-notch impact energy &lt; 27J at -20°C"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Corrosion rate exceeding 0.1 mm/year in chloride environments"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Hot-dip galvanizing with 85μm zinc coating, Cathodic protection at -0.85V vs Cu/CuSO4"
  - node_2:
      trigger: "Fatigue crack propagation at ΔK_th = 63 MPa√m"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Butt welds with toe radius &gt; 0.5t, Post-weld heat treatment at 650°C for 1 hour/25mm"
bom_nodes:
  steel-base-material:
    type: "component"
    urn: "URN:CNFX:ME:STEEL_BASE_MATERIAL"
    interface_type: "physical-logic-coupled"
  protective-coating:
    type: "component"
    urn: "URN:CNFX:ME:PROTECTIVE_COATING"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 10799:2011 - COLD-FORMED WELDED STRUCTURAL HOLLOW SECTIONS OF NON-ALLOY AND FINE GRAIN STEELS"
    scope: "Verified Engineering Specification"
  - standard: "EN 10210-1:2006 - HOT FINISHED STRUCTURAL HOLLOW SECTIONS OF NON-ALLOY AND FINE GRAIN STEELS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/manufacture-structural-metal-products/product/structural-hollow-section-steel.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "2c9d5517ea878d03dfa74a55b756c31ccd5cb40921cb6d9f37baa329261cbbb6"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Structural Hollow Section Steel

## 1. Technical Definition
Hollow steel sections used as load-bearing structural elements in construction and engineering.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **Yield strength: 235-460 MPa, Temperature: -40°C to 400°C, Wall thickness: 1.6-25.4 mm**. Failure boundary: **Euler buckling at critical load P_cr = (π²EI)/(KL)², Local buckling at wall slenderness ratio b/t &gt; 42√(235/f_y)**, Mechanism: **Plastic hinge formation at yield stress σ_y, Brittle fracture at Charpy V-notch impact energy &lt; 27J at -20°C**.

### 2.1 Analytical Physics Model
Governed by the **Frame Structural Deflection Analysis**:

> **Primary Equation**: $\delta = \frac{5 q L^4}{384 E I}$  
> **Engineering Impact**: Ensures structural stability for multi-stage machines.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| q | Uniform Load | Engineering Constant |
| E | Elastic Modulus | Engineering Constant |
| I | Moment of Inertia | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Corrosion rate exceeding 0.1 mm/year in chloride environments | 8 | Section loss reducing moment capacity M_u = Zσ_y by 15% | Hot-dip galvanizing with 85μm zinc coating, Cathodic protection at -0.85V vs Cu/CuSO4 |
| Fatigue crack propagation at ΔK_th = 63 MPa√m | 8 | Fracture at stress intensity factor K_IC = 100 MPa√m | Butt welds with toe radius &gt; 0.5t, Post-weld heat treatment at 650°C for 1 hour/25mm |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| section_size_range | Config-dependent | mm | Verified |
| cross_section_shape | Config-dependent | shape type | Verified |

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

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **CNC Tube Bending Machine**, **Welding Positioner**, **Shot Blasting Machine**  
**Downstream Applications**: Steel Trusses, Space Frame Structures, Industrial Racking Systems  

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

### Q: What are the typical applications for structural hollow section steel?
**A**: Structural hollow sections are used as load-bearing elements in building frames, bridges, industrial structures, and infrastructure projects where strength-to-weight ratio and torsional resistance are critical.

### Q: How does wall thickness affect the performance of hollow steel sections?
**A**: Wall thickness directly impacts section modulus, load-bearing capacity, and buckling resistance. Thicker walls provide higher strength and stiffness, while thinner walls reduce weight for applications where weight optimization is important.

### Q: What surface treatments are available for corrosion protection?
**A**: Common treatments include hot-dip galvanizing, epoxy coatings, and specialized paint systems. The choice depends on environmental exposure, with galvanizing offering superior protection for outdoor and corrosive environments.

## 6. Manufacturing Compliance
- ISO 10799:2011 - COLD-FORMED WELDED STRUCTURAL HOLLOW SECTIONS OF NON-ALLOY AND FINE GRAIN STEELS
- EN 10210-1:2006 - HOT FINISHED STRUCTURAL HOLLOW SECTIONS OF NON-ALLOY AND FINE GRAIN STEELS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Structural Hollow Section Steel](https://cnfx.com/industry/manufacture-structural-metal-products/product/structural-hollow-section-steel)**

### 🌐 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**: STRUCTURAL_HOLLOW_SECTION_STEEL | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: f739a269
