No yield extension, no room-temperature aging, low yield/tensile strength ratio, high strain hardening exponent and high bake hardening value.
What’s DP (Dual Phase) Steel?
No yield extension, no room-temperature aging, low yield/tensile strength ratio, high strain hardening exponent and high bake hardening value.
The microstructure is mainly composed of ferrite and martensite. Martensite islands disperse in the ferrite matrix. The soft ferrite makes the material have better formability, and the hard martensite makes the material have high strength. The coordination of strength and plasticity is realized through dual phase, so as to improve the comprehensive properties of dual phase steel.
DP steel is preferred to manufacture structural parts. The product of low yield ratio is widely applied to A-pillar reinforcement, B-pillar reinforcement. and other parts, while the product of high yield ratio is mainly used for underbody cross member, threshold, door anti-collision beam, seat frame, battery pack frame structure and other parts.
Product Overview
HC340/590DP is a 590 MPa class cold rolled dual phase steel designed for automotive structural components that require a combination of strength, formability and energy absorption. Its ferrite-martensite microstructure provides a relatively low yield-to-tensile strength ratio and high work-hardening capability, making it suitable for stamped parts with demanding structural requirements.
Compared with conventional high-strength low-alloy steels at similar yield strength levels, HC340/590DP offers higher tensile strength and favorable deformation characteristics for appropriately designed automotive components.
Typical applications include automotive seat structures, body reinforcements, chassis brackets and selected crash-energy management components.
Solucky Steel supplies HC340/590DP steel coils and sheets for automotive stamping and component manufacturing, with slitting and cut-to-length processing available according to order requirements.
Our cold rolled DP dual phase steel series covers three mainstream automotive grades:HC340/590DP, HC420/780DP, HC700/980DP. With low yield ratio, stable stamping performance and outstanding crash resistance, this graded DP steel lineup fully meets lightweight and high-strength requirements for passenger cars, commercial vehicles and new energy vehicles. All grades have clean cold-rolled surface, excellent weldability and batch stability for mass automotive production.
Mechanical Property
|
Grades |
Yield Strength(MPa) |
Tensile Strength(MPa) |
Elongation after Fracture A50 (%) |
Core Advantage |
Application |
|
HC340/590DP |
340~440 |
≥590 |
≥22 |
Superior formability and zero stamping cracks |
Automotive seat components, inner body parts and common chassis brackets. |
|
HC420/780DP |
420~550 |
≥780 |
≥15 |
Balanced performance and stable mass production |
Door impact beams, B-pillar inner reinforcements and EV battery supporting structures. |
|
HC700/980DP |
700~920 |
≥980 |
≥8 |
Ultra-high rigidity and excellent crash protection |
Automotive bumpers, A/B pillar outer panels and high-strength crash-resistant structural parts. |
Automotive Applications of HC340/590DP Dual Phase Steel
HC340/590DP is used in automotive structural and reinforcement components where high tensile strength must be combined with controlled forming performance.
Automotive Seat Frames and Supports
HC340/590DP can be selected for seat frame brackets, supporting structures and stamped reinforcement parts. Its strength and work-hardening characteristics support the production of formed components that must withstand mechanical loads.
Body Reinforcement Components
The combination of ferrite and martensite enables HC340/590DP to provide useful strength and ductility for body-in-white reinforcements, including selected pillar and sill reinforcement components.
Chassis Brackets and Cross Members
HC340/590DP offers a suitable material option for formed chassis brackets and structural supports where strength, geometry and manufacturing requirements must be balanced.
Crash-Energy Management Components
The work-hardening behavior of dual phase steel makes HC340/590DP relevant to selected automotive components designed to undergo controlled deformation during impact. Final material selection depends on component geometry, crash simulation and validation testing.
HC340/590DP vs HC340LA: Which Steel Grade Should You Choose?
HC340/590DP and HC340LA are both cold rolled high-strength automotive steels, but they use different strengthening mechanisms and are designed for different performance requirements.
| Comparison | HC340/590DP | HC340LA |
|---|---|---|
| Steel Type | Dual Phase Steel (DP) | High Strength Low Alloy Steel (HSLA) |
| Microstructure | Ferrite and martensite | Predominantly ferritic with microalloy strengthening |
| Strength Characteristics | Higher tensile strength at a comparable yield strength | Strength developed through microalloying and grain refinement |
| Work Hardening | High initial work-hardening capability | Generally lower than DP steel |
| Typical Applications | Body reinforcements, structural supports, energy-absorbing parts | Chassis brackets, structural supports, formed automotive parts |
When to Select HC340/590DP
Choose HC340/590DP when automotive components require a combination of high tensile strength, work-hardening performance and formability.
HC340LA remains an option for structural components where its mechanical properties meet the design requirements and cost efficiency is a priority.
Material substitution should be confirmed against the applicable specification, forming process and component validation requirements.
General Product Features
Low Yield Ratio
Effectively reduces stamping springback, ensuring precise dimensional accuracy after forming.
Graded Strength Coverage
Full strength portfolio covering formability-focused to crash-safety-focused grades, meeting diverse automotive structural demands.
Excellent Weldability
Adapts to spot welding, laser welding for auto production lines
Smooth CR Surface
No oxide scale, ready for direct stamping & coating
Lightweight Solution
Reduce steel thickness while improving structural safety
Size & Supply Range
- Form: Cold rolled coil, slit strip, cut-to-length sheet
- Thickness: 0.5mm – 2.5mm
- Width: 800mm – 1500mm
- Surface: Bare oiled, D+Z / ZF galvanized available
- Custom processing: Slitting, leveling, cutting available
Contact Us
Shipment & Package
Cold Rolled Steel Coils/Plates－ Buyer’s FAQs
Q:
What’s the minimum order quantity for Cold rolled coils/sheets?
A:
We accept 200-500KG quantity.
Q:
Can you provide custom size cutting and slitting?
A:
Yes, we supply cut-to-length sheets, slit strips and customized flat sizes according to drawings.
3. Is HC420/780DP equivalent to CR440Y780T?
A: Yes. HC420/780DP (GB standard) is fully equivalent to CR440Y780T (VDA/EU standard), completely interchangeable for automotive projects.
Q:
How to choose between 590DP, 780DP and 980DP?
A:
Choose HC340/590DP if you need better forming and low-cost lightweight parts. Select HC420/780DP for most standard automotive safety structures. PickHC700/980DP for ultra-high crash resistance and heavy-load reinforcement components.
Q:
Are these DP steels easy to stamp and weld?
A:
All grades feature low yield ratio, low springback and excellent weldability, suitable for mass automotive stamping and welding production.
Q:
What certificates can you provide before shipment?
A:
We can supply official Mill Test Certificate (MTC) with full mechanical & chemical data.Third-party inspection reports are available upon your request before shipment.
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