{"id":7521,"date":"2026-07-23T17:33:01","date_gmt":"2026-07-23T09:33:01","guid":{"rendered":"https:\/\/www.bomissteel.com\/product\/zero-spangle-gi-sheet\/"},"modified":"2026-07-23T17:38:11","modified_gmt":"2026-07-23T09:38:11","slug":"zero-spangle-gi-sheet","status":"publish","type":"product","link":"https:\/\/www.bomissteel.com\/ms\/product\/zero-spangle-gi-sheet\/","title":{"rendered":"Zero Spangle GI Sheet – Smooth Galvanized Steel Sheet"},"content":{"rendered":"

Zero spangle galvanized iron (GI) sheet is a hot-dip galvanized steel product manufactured with a controlled solidification process that suppresses the visible zinc crystal pattern \u2014 known as spangle \u2014 on the coated surface. The result is a uniformly smooth, matte-to-satin finish with a homogeneous zinc layer that provides consistent corrosion protection across the entire sheet area. This surface characteristic makes zero spangle GI sheet the preferred substrate for applications where subsequent painting, powder coating, or lamination is required, as well as for end-use products where a clean, blemish-free appearance is a quality specification. Available in a wide gauge range and slit to custom widths, zero spangle GI sheet serves the automotive, appliance, electronics, and medical equipment industries where surface integrity directly impacts final product quality.<\/p>\n

Key Features & Advantages<\/h2>\n

1. Uniform Smooth Surface:<\/strong> The controlled zinc bath chemistry and cooling process eliminates the dendritic crystal growth that produces visible spangle patterns. The resulting surface is flat and free of the characteristic “snowflake” or “fern-leaf” texture seen on regular spangle galvanized products. This smoothness is critical for downstream coating processes \u2014 a uniform substrate yields a uniform topcoat.<\/p>\n

2. Superior Paint & Coating Adhesion:<\/strong> The absence of spangle-induced surface relief means paint, powder coating, and adhesive films bond to a consistent substrate profile. This reduces the risk of coating defects, orange-peel effects, or localized delamination that can occur when paint is applied over the peaks and valleys of a pronounced spangle pattern.<\/p>\n

3. Consistent Zinc Layer Distribution:<\/strong> Zero spangle production involves tighter process control over bath temperature, withdrawal speed, and air-knife wiping parameters, resulting in a more uniformly distributed zinc coating thickness across the sheet width and length. Uniform zinc distribution translates to predictable corrosion performance in service.<\/p>\n

4. Excellent Formability:<\/strong> The fine-grained zinc microstructure characteristic of zero spangle products supports good drawability and bend performance. The coating remains adherent through press forming, deep drawing, roll forming, and moderate stretch-forming operations without powdering or flaking.<\/p>\n

5. Clean Aesthetic for Visible Parts:<\/strong> For products where the galvanized surface remains exposed in the final assembly \u2014 such as internal structural brackets, chassis components, or equipment enclosures \u2014 zero spangle provides a professional, consistent metallic appearance without the visual distraction of spangle patterning.<\/p>\n

\"Zero<\/p>\n

How Zero Spangle Is Achieved<\/h2>\n

The spangle pattern on conventional galvanized steel forms as the molten zinc coating solidifies on the steel strip surface during withdrawal from the zinc bath. Zinc crystal nucleation and dendritic growth produce the characteristic flower-like or star-shaped grains that become visible at the macro scale.<\/p>\n

Zero spangle production suppresses this crystallization through several process controls:<\/p>\n

    \n
  • Bath Chemistry Control:<\/strong> The zinc bath composition is carefully managed \u2014 typically with lower lead content than conventional galvanizing \u2014 because lead acts as a nucleation site for spangle formation. Aluminum additions are optimized to promote a fine, continuous Fe-Zn intermetallic layer that inhibits large-crystal growth.<\/li>\n
  • Accelerated Cooling:<\/strong> Rapid post-coating cooling reduces the time available for zinc crystal growth, effectively “freezing” the coating before visible spangle grains can develop.<\/li>\n
  • Nucleation Control:<\/strong> Fine zinc dust or steam treatment may be applied to the freshly coated strip surface to induce a high density of microscopic nucleation sites, producing a matte, fine-grained solidification structure rather than a sparse pattern of large visible crystals.<\/li>\n<\/ul>\n

    Spesifikasi Teknikal<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Nama Produk<\/td>\nZero Spangle Galvanized Iron (GI) Sheet<\/td>\n<\/tr>\n
    Julat ketebalan<\/td>\n0.12 mm \u2013 5.0 mm (standard gauge range; heavier gauges up to 5.0 mm available on request)<\/td>\n<\/tr>\n
    Julat Lebar<\/td>\n30 mm \u2013 1,500 mm (slit strip to full-width sheet; custom widths accommodated)<\/td>\n<\/tr>\n
    Panjang<\/td>\nCustom cut to buyer specification; standard sheet sizes and coil form both available<\/td>\n<\/tr>\n
    Base Metal Grades<\/td>\nDX51D, DX52D, DX53D, DX54D (EN 10346); Q235, Q345 (GB\/T 700); SGCC, SGCD (JIS G 3302); CS Type A\/B\/C (ASTM A653)<\/td>\n<\/tr>\n
    Berat Salutan Zink<\/td>\nZ30 \u2013 Z275 (30 \u2013 275 g\/m\u00b2), single-side or double-side; G30 \u2013 G90 (ASTM A653 equivalent)<\/td>\n<\/tr>\n
    Spangle Classification<\/td>\nZero spangle (S-type per EN 10346 \/ minimized spangle per ASTM A653)<\/td>\n<\/tr>\n
    Rawatan Permukaan<\/td>\nChromate passivation, anti-fingerprint coating, or oiled \u2014 specified per downstream processing requirements<\/td>\n<\/tr>\n
    Applicable Standards<\/td>\nEN 10346, ASTM A653\/A653M, JIS G 3302, GB\/T 2518<\/td>\n<\/tr>\n
    Form Availability<\/td>\nCoil, slit strip, cut-to-length sheet, and corrugated sheet profile<\/td>\n<\/tr>\n
    Perkhidmatan Pemprosesan<\/td>\nSlitting, cut-to-length, press blanking, punching, roll forming, and corrugated profiling<\/td>\n<\/tr>\n
    Minimum Order Quantity<\/td>\n10 metric tons per specification<\/td>\n<\/tr>\n
    Pembungkusan<\/td>\nStandard seaworthy export packaging with VCI moisture barrier, edge protection, and steel strapping on timber pallets; coil packaging with circumferential strapping and bore protection<\/td>\n<\/tr>\n
    Masa Pimpinan<\/td>\n15 \u2013 25 working days from order confirmation and technical approval<\/td>\n<\/tr>\n
    Quotation Basis<\/td>\nEXW, FOB, CIF, or CFR \u2014 negotiable per order volume and destination<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Zero Spangle vs. Regular Spangle: Comparative Summary<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
    Characteristic<\/strong><\/td>\nZero Spangle GI Sheet<\/strong><\/td>\nRegular Spangle GI Sheet<\/strong><\/td>\n<\/tr>\n
    Surface Appearance<\/td>\nSmooth, uniform, matte-to-satin \u2014 no visible crystal pattern<\/td>\nVisible snowflake, star, or fern-leaf crystal pattern; variable grain size<\/td>\n<\/tr>\n
    Surface Roughness (Ra)<\/td>\nTypically 0.5 \u2013 1.2 \u03bcm<\/td>\nTypically 1.5 \u2013 3.5 \u03bcm<\/td>\n<\/tr>\n
    Paint\/Coating Adhesion<\/td>\nExcellent \u2014 uniform substrate yields consistent topcoat finish<\/td>\nGood but may exhibit localized variation over spangle peaks<\/td>\n<\/tr>\n
    Zinc Distribution Uniformity<\/td>\nHighly uniform \u2014 tighter process control<\/td>\nSlightly more variable due to spangle crystal topography<\/td>\n<\/tr>\n
    Ketahanan kakisan<\/td>\nExcellent \u2014 uniform zinc coverage across entire surface<\/td>\nComparable zinc weight provides similar bulk protection; surface uniformity may influence localized initiation<\/td>\n<\/tr>\n
    Kebolehbentukan<\/td>\nGood drawability; coating integrity maintained through forming<\/td>\nComparable mechanical performance; spangle pattern may telegraph through thin topcoats<\/td>\n<\/tr>\n
    Cost<\/td>\nSlightly higher \u2014 reflects tighter process controls<\/td>\nLower \u2014 less demanding production parameters<\/td>\n<\/tr>\n
    Typical Applications<\/td>\nAutomotive panels, appliance shells, electronics enclosures, medical devices, painted\/coated products<\/td>\nGeneral construction, structural members, roofing, framing, industrial shelving, non-appearance parts<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Permohonan<\/h2>\n
      \n
    • Automotive Manufacturing:<\/strong> Zero spangle GI sheet is specified for automotive body panels, outer skins, interior structural components, chassis brackets, and underbody parts. The smooth zinc surface provides an ideal substrate for e-coat and subsequent paint layers, while the uniform zinc distribution ensures consistent corrosion protection across stamped and formed geometries. Grades such as DX53D and DX54D are recommended for deep-drawn body components.<\/li>\n
    • High-End Home Appliances:<\/strong> Refrigerator cabinets, washing machine drums, air conditioner housings, microwave oven cavities, and water heater shells benefit from the combination of corrosion resistance and consistent paintability. The zero spangle surface does not telegraph through thin appliance-grade powder coats or liquid finishes \u2014 a critical quality requirement for visible appliance exteriors.<\/li>\n
    • Electronics & IT Equipment:<\/strong> Server racks, electrical enclosures, power supply chassis, and consumer electronics housings use zero spangle GI sheet for its clean appearance, EMI shielding capability, and compatibility with post-fabrication powder coating. The anti-fingerprint surface treatment option is commonly specified for visible IT equipment panels.<\/li>\n
    • Medical & Laboratory Equipment:<\/strong> Medical device housings, laboratory furniture, hospital bed frames, and cleanroom equipment require the hygienic, smooth surface that zero spangle GI sheet provides. The absence of spangle texturing eliminates micro-crevices where contaminants could accumulate, supporting cleanability and sterilization protocols.<\/li>\n
    • Pre-Painted & Laminated Products:<\/strong> As a substrate for subsequent coil coating (PPGI production), lamination with PVC films, or adhesive bonding in composite panel manufacturing, zero spangle GI sheet offers the flat, consistent surface that maximizes coating uniformity and peel strength.<\/li>\n
    • General Industrial Fabrication:<\/strong> Electrical switchboards, control panels, HVAC ductwork components, metal furniture frames, shelving systems, and storage equipment where a combination of corrosion protection, formability, and acceptable unpainted appearance is required.<\/li>\n<\/ul>\n

      Processing & Fabrication Guidance<\/h2>\n

      Forming & Stamping:<\/strong> Zero spangle GI sheet is suitable for bending, press braking, roll forming, stamping, and moderate deep drawing. The zinc coating is metallurgically bonded and remains adherent through typical forming strains. For deep-draw applications, DX53D or DX54D deep-drawing grades are recommended, and a pre-production trial with the specific tooling set is suggested to validate performance.<\/p>\n

      Welding:<\/strong> Resistance spot welding and seam welding can be performed through the zinc coating using appropriate electrode dressing schedules. The zero spangle surface, being less textured than regular spangle, provides consistent electrical contact resistance at the electrode interface \u2014 an advantage for automated welding lines. For arc welding processes, adequate fume extraction is required for zinc oxide, and weld zones should be reconditioned with zinc-rich paint to restore corrosion protection.<\/p>\n

      Painting & Coating:<\/strong> The smooth surface of zero spangle GI sheet reduces paint consumption compared to textured spangle surfaces, as less material is needed to fill surface relief. For liquid painting, a light surface abrasion or chemical conversion coating (phosphate or chromate) is recommended to maximize topcoat adhesion. Powder coating adhesion is excellent on properly degreased zero spangle surfaces.<\/p>\n

      Storage & Handling:<\/strong> Store sheets and coils in dry, covered conditions. If chromate-passivated or oiled, the surface protection remains effective for approximately 3\u20136 months in normal warehouse environments. For extended storage, re-oiling or re-application of protective film may be required. Handle sheets on edge and use fabric or rubber-contact lifting equipment to preserve the surface finish.<\/p>\n

      Quality Assurance & Testing<\/h2>\n
        \n
      • Substrate Verification:<\/strong> Base metal chemical composition analysis, mechanical property testing (yield strength, tensile strength, elongation per applicable grade standard), and dimensional tolerance checks.<\/li>\n
      • Zinc Coating Testing:<\/strong> Coating weight by gravimetric method (weigh-strip-weigh per ASTM A90\/A90M or EN 10346 Annex A), triple-spot testing for uniformity across the coil width, and coating adherence by bend test (no flaking or cracking at specified mandrel diameter).<\/li>\n
      • Surface Quality Inspection:<\/strong> Visual inspection under controlled lighting for spangle classification confirmation, surface defect detection, and roughness measurement (Ra per ISO 4287). Zero spangle classification is verified against reference standards.<\/li>\n
      • Ketahanan Korosi:<\/strong> Salt spray testing (ASTM B117 neutral salt spray) to verify zinc coating corrosion protection performance; typical endurance of 72\u2013200 hours to white rust depending on coating weight and passivation treatment.<\/li>\n
      • Third-Party Certification:<\/strong> Independent inspection through SGS, Bureau Veritas, T\u00dcV, or equivalent agencies is supported. Mill test certificates (EN 10204 Type 2.2 or 3.1) are supplied with each shipment.<\/li>\n<\/ul>\n

        Soalan Lazim<\/h2>\n

        Q: What does “zero spangle” mean, and how does it affect product performance?<\/h3>\n

        Zero spangle refers to a galvanized surface with no visible zinc crystal pattern. It is achieved through controlled zinc bath chemistry and accelerated post-coating cooling. The performance impact is primarily in surface quality: zero spangle GI sheet offers a smoother surface that is better suited for painting, coating, and applications where surface appearance matters. Corrosion resistance at equivalent zinc coating weights is comparable to regular spangle products.<\/p>\n

        Q: Can zero spangle GI sheet be used without painting or coating?<\/h3>\n

        Yes. The smooth, uniform metallic finish of zero spangle GI sheet is aesthetically acceptable for many unpainted applications \u2014 electrical enclosures, internal brackets, shelving, and general fabrication \u2014 where the surface is visible but a premium painted finish is not required. The zinc coating alone provides the corrosion protection. For exterior or wet-environment exposure, painting or additional surface treatment is recommended.<\/p>\n

        Q: What surface treatments are applied after galvanizing?<\/h3>\n

        Three standard post-treatment options are available: chromate passivation (provides temporary corrosion protection and improves paint adhesion), anti-fingerprint coating (a thin transparent organic film that prevents handling marks and provides mild corrosion protection \u2014 commonly specified for visible appliance and electronics parts), and rust-preventative oil (for uncoated storage and processing). The appropriate treatment depends on the downstream manufacturing process.<\/p>\n

        Q: What is the minimum order quantity and typical lead time?<\/h3>\n

        The standard MOQ is 10 metric tons per specification (grade, thickness, zinc coating weight, and surface treatment combination). The typical production lead time is 15\u201325 working days from order confirmation and receipt of deposit. Shipping transit time is additional and depends on the destination port and logistics mode.<\/p>\n

        Q: Is zero spangle available in both coil and sheet form?<\/h3>\n

        Yes. Zero spangle GI is produced in coil form and can be supplied as full-width coils, slit strip (narrow coils down to 30 mm width), or cut-to-length sheets per the buyer’s dimensional specification. Corrugated sheet profiles can also be roll-formed from zero spangle substrate on request.<\/p>\n

        Q: What zinc coating weights are available, and which should I specify?<\/h3>\n

        Zinc coating weights from Z30 to Z275 (30\u2013275 g\/m\u00b2) are available. The selection depends on the service environment: Z100\u2013Z140 is typical for indoor and mild exterior applications; Z180\u2013Z275 is recommended for exterior exposure, high-humidity environments, and coastal or industrial atmospheres. Our technical team can provide specific coating weight guidance against your project’s corrosivity category.<\/p>\n

        Q: What certifications and documentation are provided?<\/h3>\n

        Standard documentation includes: mill test certificate (MTC per EN 10204), commercial invoice, packing list, bill of lading, and certificate of origin. Our manufacturing facility holds ISO 9001:2015 certification. CE marking, third-party inspection reports, and additional compliance documentation can be coordinated on request.<\/p>","protected":false},"excerpt":{"rendered":"

        Zero spangle GI sheet is a hot-dip galvanized steel product with a controlled, uniformly smooth surface free of visible zinc crystal patterns. Engineered for applications requiring superior paint adhesion, consistent coating uniformity, and a clean aesthetic finish.<\/p>\n

        Spesifikasi Utama:<\/strong><\/p>\n

          \n
        • Thickness: 0.12 mm \u2013 5.0 mm<\/li>\n
        • Width: 30 mm \u2013 1,500 mm<\/li>\n
        • Zinc Coating: Z30 \u2013 Z275 (30 \u2013 275 g\/m\u00b2)<\/li>\n
        • Grades: DX51D\u2013DX54D, Q235, Q345, SGCC, SGCD<\/li>\n
        • Surface: Smooth, matte-to-satin, no visible spangle<\/li>\n<\/ul>\n

          Sesuai untuk:<\/strong> Automotive body panels, appliance housings, electronics enclosures, medical equipment, and pre-painted coil coating substrate.<\/p>","protected":false},"featured_media":7525,"template":"","meta":{"rank_math_title":"Zero Spangle GI Sheet - Smooth Galvanized Steel Sheet","rank_math_description":"Premium zero spangle GI sheet with smooth spangle-free surface for automotive, appliance & electronics manufacturing. 0.12-5.0mm thickness, Z30-Z275 coating. Wholesale supplier - MOQ 10 tons.","rank_math_canonical_url":"","rank_math_focus_keyword":"zero spangle gi sheet"},"product_brand":[],"product_cat":[33],"product_tag":[47,58,48],"class_list":["post-7521","product","type-product","status-publish","has-post-thumbnail","product_cat-galvanized-steel-coil","product_tag-astm-a653","product_tag-dx51d","product_tag-en-10346","first","instock","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.bomissteel.com\/ms\/wp-json\/wp\/v2\/product\/7521","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bomissteel.com\/ms\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.bomissteel.com\/ms\/wp-json\/wp\/v2\/types\/product"}],"version-history":[{"count":1,"href":"https:\/\/www.bomissteel.com\/ms\/wp-json\/wp\/v2\/product\/7521\/revisions"}],"predecessor-version":[{"id":7526,"href":"https:\/\/www.bomissteel.com\/ms\/wp-json\/wp\/v2\/product\/7521\/revisions\/7526"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bomissteel.com\/ms\/wp-json\/wp\/v2\/media\/7525"}],"wp:attachment":[{"href":"https:\/\/www.bomissteel.com\/ms\/wp-json\/wp\/v2\/media?parent=7521"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.bomissteel.com\/ms\/wp-json\/wp\/v2\/product_brand?post=7521"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.bomissteel.com\/ms\/wp-json\/wp\/v2\/product_cat?post=7521"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.bomissteel.com\/ms\/wp-json\/wp\/v2\/product_tag?post=7521"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}