What Is JAC270E Cold Rolled Hot Dip Galvanized Steel?

 

JAC270E cold rolled hot dip galvanized steel is a high-performance deep-drawing automotive grade conforming to JFS (Japan Ferrous Steel Federation) standards, engineered for complex forming processes with exceptional ductility, superior corrosion resistance, and consistent mechanical properties.

 

As a key member of the JAC steel series, JAC270E is specifically optimized for cold rolling and hot dip galvanizing (Zn-Fe alloy coating), making it the preferred choice for automotive interior/exterior components, home appliances, and precision engineering parts that require both deep drawability and long-term durability. GNEE STEEL supplies JAC270E steel in full compliance with JFS A2001 (cold-rolled) and JFS A3011 (galvannealed) standards, ensuring batch-to-batch uniformity for automated production lines.

 

Other steel grades of Hot dip Zinc-Iron (ZF) alloy coating steel for automobile manufacturing:
JAC270C Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC270D Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC270F Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC270G Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC270H Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC340W Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC340H Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC390W Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC440W Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC440R Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC590R Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC340P Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC390P Hot dip Zinc-Iron (ZF) alloy coating steel,
JAC440P Hot dip Zinc-Iron (ZF) alloy coating steel

 

 

JAC270E cold rolled hot dip galvanized steel is a deep-drawing grade designed for automotive and high-precision manufacturing. Its grade designation follows JFS standards, with clear parameter definitions:

• JAC: Abbreviation for Japanese Automotive Cold-rolled steel, indicating its specialization for automotive applications.
• 270: Minimum tensile strength of 270 MPa, the core performance benchmark for the grade.
• E: Deep-drawing quality grade, signifying higher formability than JAC270C/D and lower than JAC270F.

Processing: Cold rolled (CR) base material + hot dip galvanized (HDG) Zn-Fe alloy coating, combining the advantages of cold-rolled precision and galvanized corrosion protection.

 

All JAC270E products from GNEE STEEL meet strict JFS standards, with full mill test certificates (MTC) provided for each batch, ensuring compatibility with global automotive supply chains.

 

 

The low-carbon, low-impurity chemical composition of JAC270E is precisely formulated to maximize deep drawability while maintaining structural integrity and coating adhesion. The table below details the standard composition range:

 

Element	Content Range (%)	Key Function
Carbon (C)	≤ 0.08	Minimizes hardness, enhances ductility and weldability for deep drawing
Manganese (Mn)	0.20 – 0.45	Improves strength and toughness without compromising formability
Phosphorus (P)	≤ 0.025	Strictly controlled to avoid cold brittleness and surface defects
Sulfur (S)	≤ 0.025	Reduced to ensure smooth surface quality and forming performance
Silicon (Si)	≤ 0.05	Acts as a deoxidizer, supporting a fine-grain structure
Aluminum (Al)	≥ 0.020	Grain refiner, significantly improving deep drawability and material uniformity
Iron (Fe)	Balance	Base metal matrix, ensuring structural stability

 

 

JAC270E's mechanical properties are optimized for deep drawing and complex stamping, with consistent performance across its standard thickness range. The following table presents typical values (compliant with JFS standards):

 

Thickness (mm)	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (A80, %)	Plastic Strain Ratio (r-value, min)	Hardness (HRB, max)
0.4 – 1.0	150 – 240	≥ 270	45 – 55	1.4	65
1.0 – 1.6	155 – 245	≥ 270	43 – 53	1.4	68
1.6 – 3.2	160 – 250	≥ 270	42 – 50	1.4	70

Key Advantage: The high elongation (42–55%) and r-value (≥1.4) of JAC270E ensure uniform material flow during deep drawing, preventing wrinkling, cracking, or necking-critical for complex automotive components.

 

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JAC270E is supplied as cold rolled hot dip galvanized steel, with strict controls on surface quality, coating thickness, and dimensional accuracy to meet automotive-grade requirements:

Base Material: Cold rolled steel, with a smooth surface (Ra ≤ 1.0 μm) and precise thickness tolerance (±0.02mm).

Coating Type: Hot dip Zn-Fe alloy (galvannealed/ZF) coating, offering better paint adhesion and weldability than pure zinc coating.

Coating Weight: Double-sided: 60–440 g/m²; Single-sided: 30–220 g/m² (customizable per customer requirements).

Surface Finishes:

Oiled (O): Standard finish for corrosion protection during storage and transportation.

Passivated (FD): Enhances corrosion resistance and paint adhesion for exterior components.

BNA (Bright Non-Annealed): Improves surface smoothness for high-gloss painting applications.

Phosphate-Treated (FB): Optimized for subsequent powder coating or electrocoating.

Product Forms: Coils (ID: 508mm/610mm), strips, and cut sheets; width range: 800–1800mm (custom slitting available).

 

 

JAC270E cold rolled hot dip galvanized steel is primarily used in industries requiring deep drawability and corrosion resistance, with the automotive industry as its core market:

Automotive Industry: Deep-drawn interior components (instrument panel substrates, door inner panels, seat frames), exterior parts (fender panels, hood inner linings), and structural brackets.

Home Appliances: Deep-drawn refrigerator inner linings, washing machine drums, air conditioner housings, and oven panels.

Precision Engineering: Electrical control boxes, lighting fixture components, and decorative metal parts requiring complex forming.

General Manufacturing: Metal furniture frames, HVAC ducting, and custom deep-drawn parts.

 

 

JAC270E cold rolled hot dip galvanized steel is the ideal deep-drawing solution for automotive and high-precision manufacturing, offering a perfect balance of formability, corrosion resistance, weldability, and consistency. Its compliance with JFS standards, superior surface quality, and customizable specifications make it a versatile choice for manufacturers seeking to reduce scrap rates, improve production efficiency, and enhance end-product durability. Whether you're producing complex automotive components or high-quality appliances, JAC270E delivers reliable performance that meets the most demanding industry requirements.

 

 

1. What is the difference between JAC270E and other JAC 270-series grades (C/D/F)?

The key difference lies in formability: JAC270C (commercial forming) < JAC270D (drawing quality) < JAC270E (deep drawing) < JAC270F (extra deep drawing). JAC270E has lower carbon content (≤0.08%) and higher elongation/r-value than C/D, making it suitable for more complex deep-drawing applications.

 

2. Can JAC270E be used for extreme deep drawing?

JAC270E is designed for deep drawing (elongation 42–55%, r-value ≥1.4), but for extreme deep drawing (e.g., very complex shell parts), JAC270F (extra deep drawing grade) is recommended. JAC270E is ideal for most deep-drawing needs in automotive and appliance manufacturing.

 

3. What coating options are available for JAC270E?

JAC270E is primarily supplied with hot dip Zn-Fe alloy (ZF) coating, with coating weights from 60–440g/m² (double-sided). Surface finishes include oiled, passivated, BNA, and phosphate-treated, customizable to your painting or processing requirements.

 

4. What is the minimum order quantity (MOQ) for JAC270E?

The standard MOQ for JAC270E coils is 20–25 tons, while cut sheet orders start at 5 tons. GNEE STEEL offers flexible order quantities and mixed container loads to accommodate both small-scale and large-volume production needs.

 

5. Is JAC270E compatible with welding processes?

Yes. JAC270E's low carbon content (≤0.08%) and optimized composition ensure excellent weldability, compatible with resistance spot welding (common in automotive production), MIG, TIG, and laser welding. Proper welding parameters maintain material ductility and coating integrity.

 

6. What are the dimensional tolerances for JAC270E?

JAC270E has strict dimensional tolerances: thickness tolerance ±0.02mm, width tolerance ±1.0mm, and length tolerance ±2.0mm (for cut sheets). The cold rolled base ensures high flatness, suitable for automated stamping lines.

 

7. Does JAC270E meet automotive industry standards?

Yes. JAC270E fully complies with JFS A2001 (cold-rolled automotive steel) and JFS A3011 (galvannealed automotive steel) standards, making it compatible with global automotive supply chains (e.g., Toyota, Honda, Nissan).

 

8. How does JAC270E compare to DC04 steel?

JAC270E and DC04 (EN 10130 standard) are both deep-drawing grades, but JAC270E offers higher elongation (42–55% vs. DC04's 38–48%) and better galvanized coating adhesion, making it more suitable for automotive components requiring both deep drawability and corrosion resistance.