Galvalume DC51D DC52D DC53D DC54D: How to Choose the Right Grade for Your Project?

 

DC51D+AZ, DC52D+AZ, DC53D+AZ, and DC54D+AZ are all cold-rolled, hot-dip galvalume steel grades (with 55%Al-43.4%Zn-1.6%Si AZ coating) designed for cold forming. Their core difference lies in deep drawing performance and mechanical properties-ranging from standard forming to extra deep drawing. This guide clarifies their key distinctions, with a detailed comparison table, to help you select the optimal galvalume steel grade for your stamping, drawing, or forming project.

 

Grade (Galvalume Steel)	Forming Grade (Deep Drawing Level)	Yield Strength (Re, MPa)	Tensile Strength (Rm, MPa)	Elongation (A80, %)	n-Value (Strain Hardening Exponent)	r-Value (Plastic Anisotropy Ratio)	Deep Drawing Capability	Galvalume Coating Specifications
DC51D+AZ	Standard Forming (Non-Deep Drawing)	140–220	270–350	≥22	0.18–0.22	1.0–1.2	Suitable for simple bending, shallow stamping; not for deep drawing	55%Al-43.4%Zn-1.6%Si, AZ30–AZ150 g/m² (double-sided), corrosion resistance ≥1000 hours neutral salt spray
DC52D+AZ	Shallow Deep Drawing	140–300	270–420	≥26	0.22–0.26	1.2–1.4	Suitable for shallow deep drawing (depth ≤15mm); low to medium forming stress	55%Al-43.4%Zn-1.6%Si, AZ30–AZ150 g/m² (double-sided), mechanical properties valid for 1 month after production
DC53D+AZ	Deep Drawing	140–260	270–380	≥30	0.26–0.30	1.4–1.85	Suitable for medium deep drawing (depth 15–30mm); ideal for complex stamping parts, with low cracking risk	55%Al-43.4%Zn-1.6%Si, AZ30–AZ150 g/m² (double-sided), IF steel substrate for better forming stability
DC54D+AZ	Extra Deep Drawing	120–220	260–360	≥36	0.30–0.34	1.6–1.8	Suitable for extra deep drawing (depth >30mm); high ductility for severe forming, low scrap rate	55%Al-43.4%Zn-1.6%Si, AZ30–AZ150 g/m² (double-sided), mechanical properties valid for 6 months after production

 

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1. DC51D+AZ: Standard Forming Galvalume Steel with Basic Corrosion Resistance

DC51D+AZ is a cold-rolled galvalume steel grade focusing on basic forming and corrosion resistance rather than deep drawing performance. Its elongation (≥22%) and n-value (0.18–0.22) are the lowest among the four grades, making it unsuitable for deep drawing but ideal for simple forming projects that require long-term corrosion protection from the AZ coating.

 

Applications: Roofing/wall panels, ventilation ducts, shallow bending parts, corrugated sheets, and outdoor components (benefiting from the 55%Al-Zn coating's 1,000+ hours neutral salt spray corrosion resistance, 3–5× longer than conventional galvanized steel).

 

2. DC52D+AZ: Shallow Deep Drawing Galvalume Steel for Basic Complex Parts

DC52D+AZ is a galvalume steel grade designed for shallow deep drawing, with higher elongation (≥26%) and better strain hardening (n-value 0.22–0.26) than DC51D+AZ. It can withstand low to medium forming stress, making it a cost-effective choice for parts that require slight deep drawing without extreme ductility, while retaining the corrosion resistance of galvalume coating. Note that its mechanical properties are valid for 1 month after production due to aging effects.

 

Applications: Simple stamping parts, small household appliance casings (e.g., small fan covers), metal brackets, and shallow hollow components (depth ≤15mm) used in humid or outdoor environments.

 

3. DC53D+AZ: Deep Drawing Galvalume Steel for Medium Complex Stamping

DC53D+AZ is a high-ductility galvalume steel grade optimized for deep drawing, with elongation ≥30% and r-value 1.4–1.85. Its excellent plastic anisotropy, combined with an IF steel substrate, ensures uniform deformation during deep drawing, reducing the risk of cracking or coating peeling-making it the most widely used grade for medium-complex stamping projects requiring both corrosion resistance and forming performance.

 

Applications: Home appliance shells (e.g., refrigerator door panels, washing machine inner barrels), electrical cabinet components, curved roofing panels, and medium-depth hollow parts (depth 15–30mm), especially in coastal or humid areas.

 

4. DC54D+AZ: Extra Deep Drawing Galvalume Steel for Severe Forming

DC54D+AZ is the premium galvalume steel grade for extra deep drawing, with the highest elongation (≥36%), n-value (0.30–0.34), and r-value (1.6–1.8) among the four. It offers superior ductility and strain hardening, enabling it to withstand severe forming processes without material failure or coating peeling, and its mechanical properties remain stable for 6 months after production.

 

Applications: Automotive parts (e.g., fuel tanks, door inner panels, exhaust heat shields), deep-drawn containers, complex curved components, and extra-deep hollow parts (depth >30mm) that require both corrosion resistance and extreme forming capability.

 

When choosing between DC51D+AZ, DC52D+AZ, DC53D+AZ, and DC54D+AZ, focus on three core factors: forming complexity (deep drawing depth), mechanical property requirements, and corrosion resistance needs (all grades have the same AZ coating, so focus on forming performance):

 

If you need corrosion resistance + simple forming: Choose DC51D+AZ (cost-effective, ideal for basic outdoor or humid-environment applications).

If you need shallow deep drawing (depth ≤15mm) + cost-effectiveness: Choose DC52D+AZ (balanced forming performance and price, note its 1-month mechanical property validity period).

 

If you need medium deep drawing (depth 15–30mm) + stable performance: Choose DC53D+AZ (the most versatile grade for general deep drawing projects, with IF steel substrate for better stability).

 

If you need extra deep drawing (depth >30mm) + high ductility: Choose DC54D+AZ (premium grade for severe forming, reducing production scrap rate by 12–15% compared to DC53D+AZ, with 6-month mechanical property validity).

 

Q1: Can DC51D+AZ be used for deep drawing projects?

A1: No. DC51D+AZ is designed for standard forming (simple bending, shallow stamping) rather than deep drawing. Its elongation (≥22%) and n-value (0.18–0.22) are too low to withstand deep drawing stress, which will cause coating peeling or material cracking.

 

Q2: What is the difference between deep drawing (DC53D+AZ) and extra deep drawing (DC54D+AZ) in practical use?

A2: The key difference is forming depth and ductility. DC53D+AZ handles medium deep drawing (15–30mm) with a scrap rate of 5–8%, while DC54D+AZ handles extra deep drawing (>30mm) with a scrap rate of only 2–3%. DC54D+AZ's higher r-value (1.6–1.8) also ensures better surface quality after forming, with fewer wrinkles or scratches, and its mechanical properties are stable for longer (6 months vs. 1 month for DC52D+AZ).

 

Q3: Do all four grades have the same galvalume coating quality?

A3: Yes. All four grades feature the same 55%Al-43.4%Zn-1.6%Si galvalume (AZ) coating, with a coating weight of AZ30–AZ150 g/m² (double-sided). The only difference lies in their substrate performance (mechanical properties and deep drawing capability), not the coating quality or corrosion resistance.

 

Q4: How does the n-value affect deep drawing performance of galvalume steel?

A4: The n-value (strain hardening exponent) reflects a galvalume steel's ability to resist local necking during forming. A higher n-value (e.g., 0.30–0.34 for DC54D+AZ) means the material can distribute stress evenly during deep drawing, reducing the risk of local thinning, cracking, or coating peeling-critical for extra deep drawing projects.

 

Q5: What is the price difference between the four galvalume steel grades?

A5: Prices increase with deep drawing performance: DC51D+AZ is the most cost-effective, followed by DC52D+AZ, DC53D+AZ (5–7% higher than DC52D+AZ), and DC54D+AZ (10–12% higher than DC53D+AZ). The premium for DC54D+AZ is justified by its lower scrap rate, superior forming capability, and longer mechanical property validity period.

 

Q6: Can DC53D+AZ replace DC54D+AZ for extra deep drawing projects?

A6: No. DC53D+AZ's elongation (≥30%) and r-value (1.4–1.85) are insufficient for extra deep drawing (depth >30mm). Using DC53D+AZ instead of DC54D+AZ will increase the scrap rate by 10–15% and may cause material failure or coating peeling during forming.

 

Q7: What is the typical thickness range for these galvalume steel grades?

A7: All four grades are available in thicknesses of 0.2–2.0mm (customizable up to 3.0mm for special projects), with width 1000–1500mm, consistent with standard galvalume steel specifications. Thicker sheets (≥1.5mm) may have slightly lower elongation (by 3–5%), which should be considered for deep drawing projects.

 

Q8: How to verify the deep drawing performance of these galvalume steel grades before use?

A8: Request mill test certificates (MTC) from the supplier, which include key mechanical properties (Re, Rm, elongation, n-value, r-value) and coating specifications. For critical projects, third-party testing (e.g., SGS, BV) can be conducted to confirm deep drawing capability and coating adhesion, ensuring compliance with project requirements.