When sourcing hot dip galvanized steel coil grade DC51D for construction, automotive, or general manufacturing applications, you need a supplier that combines rigorous quality control with competitive pricing. At ChinaCNU Steel, our Qingdao factory produces DC51D+Z coils that meet ISO 9001:2026 standards, backed by 15+ years of export experience to over 50 countries. This guide covers everything from zinc coating specifications and mechanical properties to FOB pricing and MOQ requirements, helping you make an informed procurement decision for your next GI coil order.
Understanding Hot Dip Galvanized Steel Coil Grade DC51D
DC51D is a European standard designation for hot dip galvanized steel coil intended for cold forming. The “D” indicates a drawing quality steel, while “C51D” refers to the specific steel grade suitable for bending, profiling, and light drawing. The “+Z” suffix denotes a zinc coating applied via the hot dip galvanizing process. This grade is widely used for roofing sheets, wall panels, air ducts, and automotive components where corrosion resistance and formability are essential.
Hot Dip Galvanized Steel Coil Grade Dc51D Price Trend (USD/Ton) – Last 12 Months
Data: ChinaCNU Steel Market Research | FOB Tianjin Reference Price
The material is produced by hot dip coating cold-rolled steel strip with a zinc layer, creating a metallurgical bond that protects the base metal. Unlike electro-galvanized products, hot dip galvanized coil offers thicker coatings and superior edge protection. For buyers comparing GI coil options, DC51D is often interchangeable with DX51D under EN 10142/EN 10143 standards, though DC51D specifically designates cold-rolled substrate while DX51D can include hot-rolled substrate. Many suppliers treat them as equivalent, but ChinaCNU Steel exclusively uses cold-rolled substrate for DC51D+Z to ensure consistent surface quality and dimensional accuracy.
Zinc Coating Specifications: Z60, Z120, and Z275
The zinc coating weight is a critical LSI keyword factor that directly impacts corrosion resistance and cost. DC51D+Z coils are available with coating designations Z60, Z120, and Z275, where the number indicates the total coating mass in grams per square meter (both sides combined). Z60 provides a thinner coating (60 g/m² total) suitable for indoor applications with low humidity. Z120 (120 g/m²) is the most common choice for general construction and automotive parts. Z275 (275 g/m²) offers heavy-duty protection for outdoor structures, agricultural buildings, and marine environments.
ChinaCNU Steel can supply any coating weight between Z60 and Z350 upon request. For standard export orders, we recommend Z120 for cost-effective performance in moderate climates. Our testing lab verifies coating thickness using magnetic induction methods per ISO 2178, ensuring every coil meets the specified minimum. The zinc layer also provides cathodic protection, meaning even if the coating is scratched, the surrounding zinc sacrifices itself to protect the exposed steel.
DC51D+Z Mechanical Properties and Dimensional Range
Hot dip galvanized steel coil grade DC51D offers excellent formability with a minimum yield strength of 140 MPa and tensile strength ranging from 270 to 500 MPa, depending on the annealing cycle. Elongation is typically above 22% for thicknesses under 0.5 mm and 20% for thicker gauges. These properties make it suitable for roll forming, bending, and stamping without cracking the zinc coating.
Our standard dimensional range includes thickness from 0.12 mm to 4.0 mm and width from 600 mm to 1500 mm. Coil inner diameter is 508 mm or 610 mm, with maximum coil weight up to 15 tons. For special projects, we can slit coils to custom widths down to 100 mm. Surface treatment options include chromate passivation, oiling, or anti-fingerprint coating for improved handling and storage life.
Comparison Table: DC51D+Z vs. DX51D+Z vs. DX52D+Z
| Property | DC51D+Z | DX51D+Z | DX52D+Z |
|---|---|---|---|
| Substrate | Cold-rolled | Hot-rolled or cold-rolled | Cold-rolled |
| Yield Strength (min) | 140 MPa | 140 MPa | 140-260 MPa |
| Tensile Strength | 270-500 MPa | 270-500 MPa | 270-420 MPa |
| Elongation (min) | 22% | 22% | 24% |
| Formability Grade | Drawing | General forming | Deep drawing |
| Typical Use | Auto parts, ducts | Roofing, cladding | Complex stampings |
| Zinc Coating Options | Z60-Z275 | Z60-Z275 | Z60-Z200 |
| Price Index (1=lowest) | 1.0 (base) | 0.95 | 1.15 |
This comparison helps buyers understand that while DC51D and DX51D share similar mechanical ranges, the cold-rolled substrate of DC51D provides a smoother surface finish and tighter thickness tolerances. For applications requiring deep drawing, DX52D offers higher elongation but at a premium price. ChinaCNU Steel stocks all three grades with full mill certification.
Why Choose ChinaCNU Steel as Your Galvanized Steel Supplier
As a leading galvanized steel supplier operating from our Qingdao factory, ChinaCNU Steel has served clients in 80+ countries since 2010. We are ISO 9001:2026 certified and hold additional certifications for CE, SGS, and BV. Our production lines can process 200,000 tons of hot dip galvanized coil annually, ensuring stable supply for large projects.
Our FOB pricing structure is transparent: for standard DC51D+Z coils with Z120 coating, FOB Tianjin port prices in 2026 range from $680 to $850 per ton depending on thickness, width, and order quantity. The MOQ is 25 tons per specification, though we can combine multiple sizes into a single container to meet the minimum. We offer free samples for qualified buyers and provide third-party inspection reports with every shipment.
Export experience matters when dealing with international logistics. Our team handles all documentation, including Bill of Lading, Certificate of Origin, and fumigation certificates for wooden packaging. We ship via 20GP or 40HQ containers, with lead times of 15-25 days from deposit. For urgent orders, we maintain a buffer stock of 5,000 tons of popular specifications at our Qingdao warehouse.
Quality Control and Testing Procedures
Every coil of hot dip galvanized steel coil grade DC51D undergoes rigorous testing before shipment. Our QC lab performs tensile testing, bend testing (180° without coating detachment), and zinc coating weight verification using both gravimetric and magnetic methods. We also check surface defects such as spangle size, oil spots, and passivation uniformity per EN 10346:2026 standards.
For customers requiring additional testing, we can arrange salt spray testing (up to 1000 hours for Z275), coating thickness mapping, and mechanical property verification at an accredited third-party lab. All test results are provided with the shipping documents. Our quality guarantee covers material defects for 12 months from delivery, excluding damage from improper storage or handling.
Frequently Asked Questions About DC51D+Z Coils
What is the difference between DC51D and DX51D galvanized steel?
DC51D uses a cold-rolled substrate, while DX51D can be made from either hot-rolled or cold-rolled steel. DC51D offers better surface finish and tighter tolerances, making it preferred for visible applications. DX51D is more economical for structural uses where surface appearance is less critical. Both have similar mechanical properties and are often interchangeable for general forming.
Is DC51D+Z suitable for outdoor use?
Yes, with the correct zinc coating weight. For outdoor applications, we recommend Z275 coating (275 g/m² total) which provides 15-20 years of corrosion protection in moderate climates. For coastal or industrial environments, consider Z350 or additional paint coating. The zinc layer self-heals minor scratches through cathodic protection.
What is the MOQ for DC51D hot dip galvanized coil?
Our standard MOQ is 25 tons per specification. This can be a single coil size or a combination of different thicknesses and widths within the same container. For trial orders, we can sometimes accommodate 10-15 tons at a slight premium. Contact our sales team to discuss your specific requirements.
How does FOB Tianjin pricing compare to other ports?
FOB Tianjin is typically 2-5% lower than FOB Shanghai or Tianjin due to lower terminal handling charges and efficient port operations. In 2026, our FOB price for DC51D+Z Z120 0.5mm x 1250mm is approximately $720/ton. Prices fluctuate with zinc LME rates and steel raw material costs, so we recommend requesting a real-time quote for your specific order.
Can you provide mill test certificates for every coil?
Yes, every shipment includes a mill test certificate (MTC) per EN 10204 Type 3.1, showing chemical composition, mechanical properties, coating weight, and dimensional results. We also provide SGS or BV inspection reports if required. All certificates are issued by our ISO 9001:2026 certified quality management system.
Order Your DC51D+Z Coils Today
ChinaCNU Steel is ready to supply your hot dip galvanized steel coil grade DC51D with competitive FOB pricing, ISO certification, and reliable export logistics. Whether you need Z60 for indoor panels or Z275 for heavy-duty roofing, our Qingdao factory delivers consistent quality with 15+ years of expertise. Contact our sales team for a free quotation, sample request, or technical consultation.
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