--- type: "product_component" title: "Pre-Painted Galvanized Steel Coil" industry: "Metal Furniture" verification_protocol: urn: "URN:CNFX:ME:PRE_PAINTED_GALVANIZED_STEEL_COIL" data_integrity_hash: "94d9367bc1cf33af0f8efebe172415db" 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:PRE_PAINTED_GALVANIZED_STEEL_COIL" data_source_uri: "https://cnfx.com/llms/industry/metal-furniture/product/pre-painted-galvanized-steel-coil.md" official_resource_url: "https://cnfx.com/industry/metal-furniture/product/pre-painted-galvanized-steel-coil" is_verified_logic: true attributes: steel_thickness: status: "verified" value: "0.3–2.0" unit: "mm" coil_width: status: "verified" value: "600–1250" unit: "mm" coil_weight: status: "verified" value: "3–10" unit: "kg" surface_hardness: status: "verified" value: "HB 60–80" unit: "Pencil Hardness" color_consistency: status: "verified" value: "ΔE ≤ 1.0" unit: "ΔE" gloss_level: status: "verified" value: "20–80" unit: "GU" coating_thickness: status: "verified" value: "20–40" unit: "μm" tensile_strength: status: "verified" value: "270–500" unit: "MPa" yield_strength: status: "verified" value: "140–350" unit: "MPa" elongation: status: "verified" value: "20–40" unit: "%" bendability: status: "verified" value: "0–2T" unit: "" impact_resistance: status: "verified" value: "≥ 9" unit: "J" salt_spray_resistance: status: "verified" value: "≥ 500" unit: "h" operating_temperature: status: "verified" value: "-20–80" unit: "°C" engineering_limits: max_safe_operating_point: value: 15 unit: "N" consequence: "Electrochemical corrosion at coating defects (anodic dissolution), polymer coating embrittlement via UV degradation (Norrish Type II reactions), zinc sacrificial protection depletion" fmea_matrix_quantitative: - node_1: trigger: "Insufficient surface energy (<38 mN/m) during coil coating application" mitigation_protocol: "Plasma surface treatment pre-coating to achieve >45 mN/m surface energy" - node_2: trigger: "Chromate-free conversion coating thickness <100 nm" mitigation_protocol: "Nano-cerium based conversion coating at 200-300 nm thickness with 0.5% cerium concentration" bom_nodes: steel-substrate: type: "component" llms_uri: "https://cnfx.com/llms/industry/basic-metal-manufacturing/component/steel-substrate.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:STEEL_SUBSTRATE" urn: "URN:CNFX:ME:UNIT:STEEL_SUBSTRATE" interface_type: "physical-logic-coupled" is_migrated_part: true zinc-coating: type: "component" llms_uri: "https://cnfx.com/llms/industry/basic-metal-manufacturing/component/zinc-coating.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:ZINC_COATING" urn: "URN:CNFX:ME:UNIT:ZINC_COATING" interface_type: "physical-logic-coupled" is_migrated_part: true primer-layer: type: "component" llms_uri: "https://cnfx.com/llms/industry/basic-metal-manufacturing/component/primer-layer.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:PRIMER_LAYER" urn: "URN:CNFX:ME:UNIT:PRIMER_LAYER" interface_type: "physical-logic-coupled" is_migrated_part: true top-coat: type: "component" llms_uri: "https://cnfx.com/llms/industry/basic-metal-manufacturing/component/top-coat.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:TOP_COAT" urn: "URN:CNFX:ME:UNIT:TOP_COAT" interface_type: "physical-logic-coupled" is_migrated_part: true manufacturing_compliance: url: "https://cnfx.com/llms/industry/metal-furniture/product/pre-painted-galvanized-steel-coil.md" on_chain_sovereignty: contract_standard: "ERC-721-Industrial" metadata_hash: "d9fbbe1365dfcb437935e9d93a617dbbcc0b7bd989310db38e967fcaccdf7cfa" royalty_logic: "IPFS-CID-REQUIRED" mint_status: "logic-verified-ready" rag_vector_index: semantic_queries: - "Pre-Painted Galvanized Steel Coil" - "pre-painted galvanized steel coil" - "metal furniture material" - "coil specifications" - "GB/T 12754" - "Pre-Painted Galvanized Steel Coil in Metal Furniture" - "China Pre-Painted Galvanized Steel Coil manufacturer" - "Pre-Painted Galvanized Steel Coil supplier China" - "Pre-Painted Galvanized Steel Coil steel_thickness" - "Pre-Painted Galvanized Steel Coil coil_width" - "Pre-Painted Galvanized Steel Coil coil_weight" version: "3.3.5-EXTREME-SOVEREIGN-WEB3" --- # Industrial Specification: Pre-Painted Galvanized Steel Coil ## 1. Technical Definition Factory-coated steel coil with corrosion protection and decorative finish for metal furniture manufacturing. ## 2. Engineering Reasoning & Causal Matrix > **Operational Intelligence**: Designed for **0.5-2.0 mm thickness, 600-1500 MPa yield strength, -40°C to 120°C temperature range**. Failure boundary: **Coating adhesion failure at >15 N/mm peel strength, substrate corrosion at <5 μm zinc coating thickness, paint cracking at >2% elongation**, Mechanism: **Electrochemical corrosion at coating defects (anodic dissolution), polymer coating embrittlement via UV degradation (Norrish Type II reactions), zinc sacrificial protection depletion**. ### 2.2 FMEA (Failure Mode & Effects Analysis) | Event Trigger | Severity | Failure Mode | Mitigation Strategy | | :--- | :--- | :--- | :--- | | Insufficient surface energy (<38 mN/m) during coil coating application | Not specified | Coating delamination during forming operations (paint peeling) | Plasma surface treatment pre-coating to achieve >45 mN/m surface energy | | Chromate-free conversion coating thickness <100 nm | Not specified | Red rust formation within 500 hours salt spray test (ASTM B117) | Nano-cerium based conversion coating at 200-300 nm thickness with 0.5% cerium concentration | ## 3. Key Technical Parameters | Parameter | Value | Unit | Status | | :--- | :--- | :--- | :--- | | Steel Thickness | 0.3–2.0 | mm | Verified | | Coil Width | 600–1250 | mm | Verified | | Coil Weight | 3–10 | kg | Verified | | Surface Hardness | HB 60–80 | Pencil Hardness | Verified | | Color Consistency | ΔE ≤ 1.0 | ΔE | Verified | | Gloss Level | 20–80 | GU | Verified | | Coating Thickness | 20–40 | μm | Verified | | Tensile Strength | 270–500 | MPa | Verified | | Yield Strength | 140–350 | MPa | Verified | | Elongation | 20–40 | % | Verified | | Bendability | 0–2T | | Verified | | Impact Resistance | ≥ 9 | J | Verified | | Salt Spray Resistance | ≥ 500 | h | Verified | | Operating Temperature | -20–80 | °C | Verified | ## 4. System BOM & Knowledge Routing ### Core Components (Recursive Links) ### Industrial DNA Context (De-duplicated) **Complementary Dependencies**: **Coil Slitting Line**, **Coil Decoiling Machine**, **Press Brake Machine** **Downstream Applications**: Office Chairs, Storage Cabinets, Industrial Workbenches ## 5. Engineering Risks & FAQ - **Caution**: - **Caution**: - **Caution**: ### Q: What are the typical dimensions of pre-painted galvanized steel coil? **A**: Typical dimensions include steel thickness of 0.3–2.0 mm, coil width of 600–1250 mm, and coil weight of 3–10 kg (unit as specified). These are reference ranges; confirm exact values with the supplier. ### Q: What coating properties are available? **A**: Coating thickness per side is 20–40 μm, surface hardness is HB 60–80, gloss level is 20–80 GU, and color consistency is ΔE ≤ 1.0. These are based on standards like GB/T 13448, GB/T 6739, GB/T 9754, and GB/T 11186.2. ### Q: What mechanical properties should I expect? **A**: Tensile strength is 270–500 MPa, yield strength is 140–350 MPa, and elongation is 20–40% (A50). Bendability is 0–2T without cracking, and impact resistance is ≥ 9 J. Verify with the supplier for the specific grade. ### Q: How does corrosion resistance perform? **A**: Salt spray resistance is ≥ 500 hours without blistering or corrosion creep, per GB/T 10125. The galvanized layer provides sacrificial protection, and the coating acts as a barrier. Actual performance depends on the environment and application. ## 6. Manufacturing Compliance --- ### 🛠️ Engineering Resource Access 🔗 **[Full Specification: Pre-Painted Galvanized Steel Coil](https://cnfx.com/industry/metal-furniture/product/pre-painted-galvanized-steel-coil)** ### 🌐 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**: PRE_PAINTED_GALVANIZED_STEEL_COIL | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: e406bbf1