What Is JAC270D Low Carbon Cold Rolled Steel?

 

JAC270D low carbon cold rolled steel is a premium extra-deep drawing (EDDQ) cold-rolled steel grade conforming to JIS G 3302/G 3313 standards, designed for complex metal forming applications with exceptional ductility, surface quality, and dimensional precision. As a specialized low-carbon steel variant, JAC270D delivers optimized mechanical properties for severe stamping, deep drawing, and high-precision fabrication, making it a top choice for industries demanding flawless formability and consistent performance.

 

JAC270D stands apart from standard cold-rolled grades through its stringent chemical composition controls and specialized cold-rolling production processes. The "D" designation denotes extra-deep drawing quality, meaning this grade undergoes ultra-low carbon refining, strict impurity control, and continuous annealing to achieve unmatched ductility for complex shaping.

 

 

Element	JAC270D Standard Limit	Functional Purpose
Carbon (C)	≤0.10	Ensures extreme ductility; prevents cracking during deep drawing
Manganese (Mn)	≤1.0	Enhances strength while preserving formability; neutralizes harmful sulfur effects
Phosphorus (P)	≤0.03	Minimized to avoid brittleness; critical for deep drawing performance
Sulfur (S)	≤0.02	Strictly controlled to eliminate inclusions; prevents surface defects and fracture
Silicon (Si)	≤0.03	Maintains smooth surface finish; ideal for painting/coating post-processing
Aluminum (Alt)	≥0.02	Deoxidizes steel; refines grain structure for improved uniformity
Nitrogen (N)	≤0.006	Prevents age-hardening; maintains stable properties during storage

 

Property	JAC270D Value Range	Performance Benefit
Yield Strength	115–225 MPa	Low yield for easy initial deformation; reduces press tonnage requirements
Tensile Strength	≥270 MPa	Balanced strength post-forming; ensures structural integrity
Elongation (A80)	39–54%	Industry-leading ductility; enables complex, multi-stage deep drawing
r-value (Plastic Strain Ratio)	≥1.4	Excellent through-thickness ductility; prevents thinning/wrinkling in deep draws
n-value (Work Hardening Index)	≥0.16	Uniform deformation; avoids localized necking during stamping
Thickness Tolerance	±0.015 mm	Ultra-precise dimensions; perfect for automated high-speed production lines

 

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• Unmatched Deep Drawing Capability

JAC270D's high elongation (up to 54%) and superior r-value enable the production of intricate, deep-reach components that would crack or fail with standard cold-rolled grades. It handles complex geometries, sharp corners, and deep draws without defects, making it indispensable for precision-formed parts.

 

• Flawless Surface Quality

Produced with strict surface control protocols, JAC270D offers a smooth, defect-free finish ideal for visible components, electro-coating, powder coating, or plating. Its consistent surface roughness eliminates prep work and ensures superior adhesion for subsequent finishing processes.

 

• Excellent Formability & Workability

Low yield strength and high ductility simplify bending, flanging, curling, and complex stamping operations. JAC270D maintains dimensional stability post-forming, reducing scrap rates and rework in high-volume manufacturing.

 

• Consistent & Stable Performance

Strict quality control throughout production delivers uniform mechanical properties across every coil. Non-aging characteristics prevent hardening during storage, ensuring consistent formability even after prolonged warehousing.

 

 

JAC270D's specialized properties make it the material of choice for high-precision, complex-geometry components across critical industries:

 

Automotive Manufacturing: Body panels, door frames, hoods, trunk lids, fuel tanks, structural reinforcements, and electric vehicle battery trays

Home Appliances: Refrigerator cabinets, washing machine drums, oven interiors, air conditioning components, and high-end cookware

Electrical Enclosures: Precision cabinets, meter boxes, control panels, and electronic housing requiring smooth finishes

Metal Furniture: Office furniture components, decorative trim, chair bases, and shelving with complex bends

Precision Engineering: Medical device housings, optical equipment parts, and small appliance components

Container & Packaging: Aerosol cans, metal tubes, and specialty packaging requiring deep drawing and seamless forming

 

 

1. What does the "D" in JAC270D stand for?

The "D" designation indicates extra-deep drawing quality (EDDQ), the highest formability classification in the JAC270 series, specifically engineered for the most complex deep-drawing applications.

 

2. How does JAC270D compare to JAC270C?

JAC270D features stricter controls on carbon, phosphorus, and sulfur content, higher elongation (39–54% vs. 32–38% for JAC270C), and superior r-values, making it suitable for more severe forming operations than JAC270C.

 

3. What thicknesses are available for JAC270D?

Standard thickness ranges from 0.4 mm to 3.2 mm, with custom thicknesses available upon request.

 

4. Is JAC270D suitable for galvanizing or coating?

Yes, JAC270D's clean, smooth surface and low carbon content make it an excellent base material for hot-dip galvanizing, electro-galvanizing, galvannealing, and organic coatings.

 

5. What standards does JAC270D conform to?

JAC270D complies with JIS G 3302 and JIS G 3313 standards, the primary Japanese specifications for cold-rolled steel sheets and coils for pressing and forming.

 

6. Can JAC270D be welded easily?

Absolutely. Its low carbon and impurity content provide excellent weldability across all common welding processes without preheating or post-weld treatment.

 

7. What is the typical delivery condition for JAC270D?

JAC270D is supplied cold-rolled and continuously annealed (soft annealed) for maximum ductility, with skin-pass rolling to ensure flatness and surface quality.

 

8. Does JAC270D experience age-hardening?

No. JAC270D is produced with nitrogen control and stabilization treatments to prevent aging, maintaining consistent formability even after extended storage.