DX51D/ SGCC Galvanized Coil

DX51D (EN 10346) / SGCC (JIS G3302) represents ‌commercial-grade galvanized steel‌ with zinc coating applied via continuous hot-dip process. The substrate consists of low-carbon steel (C≤0.12%) with Al/Mg/Si microalloying for enhanced formability.

DX51D/SGCC Galvanized Steel Coil: Technical Specifications & Industrial Applications‌

‌Material Definition & Standards‌

‌Global Standard Equivalents‌

Region	Standard	Equivalent Grade	Coating Class
EU	EN 10346	DX51D+Z	Z100-Z275
Asia	JIS G3302	SGCC	Z12-Z27
USA	ASTM A653	G90	0.90 oz/ft²

‌Critical Product Parameters‌

Parameter	Specification Range	Test Method
‌Thickness‌	0.12-3.5mm (±0.05mm)	EN 10143
‌Width‌	600-1,500mm (±1mm)	ISO 9444
‌Coil Weight‌	3-20 MT	EN 10259
‌Zinc Coating‌	60-275g/m²	ISO 1460
(Equivalent)	8.6-39.5μm
‌Spangle Size‌	Regular/Minimal	ASTM A924

‌Manufacturing Process‌

‌Continuous Hot-Dip Galvanizing Line (CGL)‌

‌Surface Preparation‌
- Alkaline cleaning (pH 12.5 @ 70°C)
- 15% HCl pickling (Fe²+ <80g/L)
‌Galvanizing‌
- Zn bath composition:
  - 99.995% Zn
  - 0.18-0.25% Al (for spangle control)
- Bath temperature: 450-465°C
‌Post-Treatment‌
- Chromate passivation (Cr³+ 3-5g/m²)
- Oiling (1-3g/m² anti-fingerprint)

‌Mechanical Properties‌

Property	DX51D (EN)	SGCC (JIS)
Yield Strength	140-260 MPa	270 MPa min
Tensile Strength	270-420 MPa	330 MPa min
Elongation (A80mm)	≥22%	≥18%
Bend Radius	0.5×T (0° bend)	1.0×T (180° bend)

‌Industrial Applications‌

‌1. Construction & Architecture‌

‌Roofing Systems‌
- Standing seam roofs (0.4-0.7mm, Z180 coating)
- Composite panels with 50μm PVDF coating
‌HVAC Components‌
- Air ducts (0.6-1.2mm, chromate passivated)

‌2. Appliance Manufacturing‌

Component	Coating Requirement	Surface Treatment
Refrigerator panels	Z120 + smooth spangle	Electrophoretic painting
Washing machine drums	Z100 + chemical film	Powder coating adhesion ≥9.5MPa

‌3. Automotive Engineering‌

Interior structural parts (Z60-Z90 coating)
Truck trailer underbody (Z200 + Zn-Mg alloy)

‌Key Performance Advantages‌

‌Corrosion Resistance‌
- Salt spray resistance:
  - Z120: 480h white rust ≤5% (ISO 9227)
‌Formability‌
- Limit dome height: 7.5-9.0mm (ISO 20482)
- Hemming compatibility (0.5T radius)
‌Welding Compatibility‌
- Resistance welding parameters:
  - 8-12kA @ 2.5kN (1.0mm thickness)

‌Quality Certification‌

CE Marking (CPR 305/2011 for construction)
REACH SVHC compliance (Zn, Cr³+)
RoHS 2.0 (2011/65/EU)

‌Packaging Options‌

Waterproof paper + steel strapping
VCI (Volatile Corrosion Inhibitor) film wrapping
Custom slit widths (±0.3mm tolerance)

Product Parameters

Product Name	DX51D/ SGCC Galvanized Coil
Thickness	0.12mm-3.5mm
Width	600mm-1500mm
Length	508mm/610mm, Support Customization
Standard	AISI, ASTM, DIN, JIS, GB, JIS, SUS, EN, etc.
Zinc Layer	Hot Galvanizing: 60-275g/m²
Zinc Layer	Pre-galvanized: 80-275g/m²

Chemical Composition

Standard	Grade	C	Si	Mn	P	S	Ti
Forcold Forming Chinese Standard	DX51D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX52D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX53D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX54D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX56D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX57D+Z	0.12	0.50	0.60	0.100	0.045	0.30
Forcold Forming Japanese Standard	SGCC	0.15	0.50	0.80	0.050	0.030	0.025
	SGCD1 SGCD2	0.12 0.10	0.50 0.50	0.60 0.45	0.040 0.030	0.030 0.030	0.025 0.025
	SGCD3	0.08	0.50	0.45	0.030	0.030	0.025
	SGCD4	0.06	0.50	0.45	0.030	0.030	0.025
For Structure Japanese Standard	SGC340	0.25	0.50	1.70	0.200	0.035	0.025
	SGC400 SGC440	0.25 0.25	0.50 0.50	1.70 2.00	0.200 0.200	0.035 0.035	0.150 0.150
	SGC490	0.30	0.50	2.00	0.200	0.035	0.025
	SGC510	0.30	0.50	2.50	0.200	0.035	0.025
For Structure AISI Standard	S220GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S250GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S280GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S320GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S350GD+Z	0.20	0.60	0.70	0.100	0.045	0.150
	S550GD+Z	0.20	0.60	0.70	0.100	0.045	0.150

Mechanical Properties

Grade	Yield Strength MPa≥	Tensile Strength MPa≥	Elongation A%≥
DX51D Z/ZM/AZ/AM	240-380	270-500	22
DX52D Z/ZM/AZ/AM	140-300	270-420	26
DX53D Z/ZM/AZ/AM	140-260	270-380	30
DX54D Z/ZM/AZ/AM	120-220	260-350	36
S220GD Z/ZM/AM	220	300	20
S250GD Z/ZM/AZ/AM	250	330	19
S280GD Z/ZM/AM	280	360	18
S300GD A/AM	300	380	18
S320GD Z/ZM/AM	320	390	17
S350GD Z/ZM/AZ/AM	350	420	16
S450GD A/AM	450	480	15
S550GD Z/ZM/AZ/AM	550	550	–

Galvanized Surface Selection

Zero Spangle	Minimized Spangle	Normal Spangle	Large Spangle

Use of The Environment	Recommended Zinc Thickness
Indoor Use	Z10 or Z12 (100g/㎡or 120g/㎡)
Suburbs	Z20 and Painting (200g/㎡)
Urban or Industrial Area	Z27 (270g/㎡) or G90 (US Standard) and painted
Coastal Area	Thicker than Z27 (270g/㎡) or G90 (US Standard) and painted
Punch or Deep Drawing Application	Thicker than Z27 (270grams/㎡) or G90 (US Standard) avoid coating peeling after stamping

Surface Treatment Type	Code	Features
Chromic Acid Treatment	C	Good corrosion resistance, suitable for bare state
Chromic Acid Treatment+Oiling	S	Good corrosion resistance
Phosphoric Acid Treatment (Including Sealing Treatment)	P	Have a certain corrosion resistance, good paint performance
Phosphoric Acid Treatment (Including Sealing Treatment)+Oiling	Q	Has a certain corrosion resistance, good paint performance, prevent rust during transportation and storage
Phosphoric Acid Treatment (Excluding Sealing Treatment)	T	Have a certain corrosion resistance, good paint performance
Phosphoric Acid Treatment (Excluding Sealing Treatment)+Oiling	V	Has a certain corrosion resistance, good paint performance, and prevent rust
Oiling	O	Prevent rust during transportation and storage
No Treatment	M	Suitable for immediate painting

Material Comparison

Chinese Standard	Japan Standard	European Standard
DX51D Z/DC51D Z (CR)	SGCC	DX51D Z
DX52D Z/DC52D Z	SGCD1	DX52D With
DX53D Z/DC53D Z/DX54D Z/DC54D Z	SGCD2/SGCD3	DX53D Z/DX54D Z
S220/250/280/320/350/550GD Z	SGC340/400/440/490/570	S220/250/280/320/350GD Z
DX51D Z/DD51D Z (HR)	SGHC	DX51D Z