--- type: "product_component" 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: yield_strength: status: "verified" value: "235–355" unit: "MPa" tensile_strength: status: "verified" value: "360–510" unit: "MPa" wall_thickness: status: "verified" value: "2.0–12.5" unit: "mm" section_modulus: status: "verified" value: "3.5–1200" unit: "cm³" surface_treatment: status: "verified" value: "HDG 70–85" unit: "treatment type" length_tolerance: status: "verified" value: "±0.5" unit: "mm" outer_dimension: status: "verified" value: "20–400" unit: "mm" corner_radius: status: "verified" value: "1.5–6.0" unit: "mm" mass_per_meter: status: "verified" value: "1.2–150" unit: "kg/m" torsional_constant: status: "verified" value: "0.5–1500" unit: "cm⁴" straightness_tolerance: status: "verified" value: "0.2–0.3" unit: "%" twist_tolerance: status: "verified" value: "2–4" unit: "mm/m" 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 < 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 > 0.5t, Post-weld heat treatment at 650°C for 1 hour/25mm" bom_nodes: steel-base-material: type: "component" llms_uri: "https://cnfx.com/llms/industry/basic-metal-manufacturing/component/steel-base-material.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:STEEL_BASE_MATERIAL" urn: "URN:CNFX:ME:UNIT:STEEL_BASE_MATERIAL" interface_type: "physical-logic-coupled" is_migrated_part: true protective-coating: type: "component" llms_uri: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/component/protective-coating.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:PROTECTIVE_COATING" urn: "URN:CNFX:ME:UNIT:PROTECTIVE_COATING" interface_type: "physical-logic-coupled" is_migrated_part: true 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: "f83c38a4e809705e73418673168daaf392010d877257e1aa3ade657cefe703a5" royalty_logic: "IPFS-CID-REQUIRED" mint_status: "logic-verified-ready" rag_vector_index: semantic_queries: - "Structural Hollow Section Steel" - "structural hollow section" - "steel tube" - "EN 10210" - "EN 10219" - "carbon steel" - "high-strength low-alloy steel" - "Structural Hollow Section Steel in Manufacture Structural Metal Products" - "China Structural Hollow Section Steel manufacturer" - "Structural Hollow Section Steel supplier China" - "Structural Hollow Section Steel yield_strength" - "Structural Hollow Section Steel tensile_strength" - "Structural Hollow Section Steel wall_thickness" version: "3.3.5-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 > 42√(235/f_y)**, Mechanism: **Plastic hinge formation at yield stress σ_y, Brittle fracture at Charpy V-notch impact energy < 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 > 0.5t, Post-weld heat treatment at 650°C for 1 hour/25mm | ## 3. Key Technical Parameters | Parameter | Value | Unit | Status | | :--- | :--- | :--- | :--- | | Yield Strength | 235–355 | MPa | Verified | | Tensile Strength | 360–510 | MPa | Verified | | Wall Thickness | 2.0–12.5 | mm | Verified | | Section Modulus | 3.5–1200 | cm³ | Verified | | Surface Treatment | HDG 70–85 | treatment type | Verified | | Length Tolerance | ±0.5 | mm | Verified | | Outer Dimension | 20–400 | mm | Verified | | Corner Radius | 1.5–6.0 | mm | Verified | | Mass per Meter | 1.2–150 | kg/m | Verified | | Torsional Constant | 0.5–1500 | cm⁴ | Verified | | Straightness Tolerance | 0.2–0.3 | % | Verified | | Twist Tolerance | 2–4 | mm/m | 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 materials used for structural hollow section steel? **A**: According to the directory, the materials on file are carbon steel and high-strength low-alloy steel. These are common for structural applications, but the exact grade should be confirmed with the supplier. ### Q: What standards apply to structural hollow section steel? **A**: The directory lists EN 10025 for material properties, EN 10210 for hot-finished sections, EN 10219 for cold-formed sections, and ISO 1461 for hot-dip galvanized coating. These are reference standards; compliance must be verified with the manufacturer. ### Q: What are the key parameters to consider when selecting structural hollow sections? **A**: Key parameters include yield strength, tensile strength, wall thickness, section modulus, outer dimension, mass per meter, and torsional constant. The directory provides reference ranges, but exact values depend on the specific product and application. ### Q: How should I verify the suitability of a structural hollow section for my project? **A**: You should confirm the required load-bearing capacity, dimensions, and tolerances with the legal manufacturer or supplier. Always check the relevant standards and request test certificates or documentation to ensure compliance. ## 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