HC340/590DP Dual Phase Steel: Properties, Grade Specifications, and Automotive Applications Guide
HC340/590DP is a cold-rolled dual phase steel grade designed to combine relatively high strength with useful formability. Its grade designation indicates a minimum tensile strength class of approximately 590 MPa, while the “340” identifies a lower yield-strength level used in the grade specification. Automotive buyers commonly evaluate it for structural and reinforcement parts where forming performance and strength must be balanced. Exact mechanical requirements, coating, thickness, and delivery condition should be confirmed against the applicable standard and purchase specification before ordering.
Key Takeaways
- HC340/590DP is a dual phase steel used in automotive applications that need a combination of strength and formability.
- Typical EN 10346 property ranges are a yield strength of 340–420 MPa, tensile strength of 590–700 MPa, and minimum A80 elongation of 17%; confirm the relevant standard edition and product specification.
- Part geometry, forming process, coating, thickness, and testing requirements should all be considered when selecting the grade.
- At Solucky Steel, we can review a buyer’s technical requirements and discuss suitable supply options before quotation.
Who This Guide Is For
This guide is intended for automotive component manufacturers, steel service centers, procurement teams, and engineers assessing cold-rolled high-strength steel. It is especially relevant when a project is considering HC340/590DP for a formed part and needs to compare mechanical properties, production requirements, and sourcing details. The information is for initial material evaluation, not a substitute for a component-level design review or a controlled material specification.
What Is HC340/590DP Dual Phase Steel?
Grade designation and basic structure
HC340/590DP is a high-strength, low-alloy cold-rolled steel grade in the dual phase family. Dual phase steels typically have a ferritic matrix with harder martensitic islands; the specific microstructure and properties depend on the producer’s chemistry and processing route. This structure is associated with a useful balance of strength and forming response, but actual performance must be assessed using the supplied coil data and, where needed, forming trials.
The “HC” designation is used for cold-rolled products in the relevant European steel designation system, while “DP” identifies the dual phase family. In the grade name, 340 and 590 refer to strength classes rather than guaranteed values for every individual coil. The applicable standard, product thickness, delivery condition, and agreed tolerances determine the exact requirements.
Typical Grade Specifications and Properties
For a common EN 10346 specification, HC340/590DP is associated with a yield strength range of 340–420 MPa and a tensile strength range of 590–700 MPa. A minimum A80 elongation value of 17% is also commonly specified for this grade. Treat these figures as a reference for preliminary comparison: buyers should verify the standard edition, testing direction, thickness range, coating, and inspection documents requested for their order.
| Property | Typical reference value | Buyer note |
|---|---|---|
| Yield strength | 340–420 MPa | Confirm the test method and applicable product specification. |
| Tensile strength | 590–700 MPa | Assess together with forming and part-performance requirements. |
| Elongation, A80 | 17% minimum, where specified | Confirm gauge length and thickness-related requirements. |
Mechanical properties alone do not describe the entire material. Buyers should also specify thickness and width tolerances, surface quality, flatness, edge condition, coating type if required, and packaging. Values in this table are not a guarantee for a particular shipment; the governing order specification and supplied inspection documentation take precedence.
Automotive Applications and Material Matching
HC340/590DP may be considered for automotive parts that need more strength than conventional mild steel while retaining capacity for forming. Potential applications include selected structural reinforcements, brackets, seat-related components, and other formed parts, subject to design approval and validation. Suitability depends on the component’s load case, geometry, joining method, corrosion protection needs, and manufacturing process.
Match the grade to the forming operation
Before selecting the grade, review the part’s draw depth, bend radii, flanging features, and risk of localized thinning or cracking. Higher strength does not automatically mean better performance in every forming operation, and different coils may show variation within the permitted specification limits. Where the component has demanding geometry, a trial using representative material and tooling is a prudent step.
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Consider coating and downstream processing
Confirm whether the application requires an uncoated cold-rolled product or a coated variant, and state the coating designation clearly when applicable. Coating can affect friction, welding, corrosion protection, and downstream handling, so the material choice should be coordinated with the component process. Buyers should also check compatibility with their stamping, joining, painting, and storage requirements.
How to Select HC340/590DP for a Project
- Define the part requirements. Identify the component function, design loads, target thickness, geometry, and relevant safety or durability requirements.
- Specify the governing standard. Name the standard and edition, grade, delivery condition, and any customer-specific requirements rather than relying on a grade name alone.
- Confirm product dimensions and finish. State thickness, width, tolerances, surface condition, edge requirements, and coating needs.
- Validate manufacturing performance. Review forming, joining, and surface-treatment needs with engineering and production teams; arrange trials where the risk or geometry warrants them.
- Agree inspection and documentation. Clarify required test documents, traceability, sampling, packaging, and acceptance criteria in the purchase order.
Pricing, Minimum Order Quantity, and Lead Time
Pricing for HC340/590DP depends on order dimensions, quantity, coating or finish, inspection requirements, packaging, and delivery terms. Market conditions and production availability can also affect a quotation, so a single fixed price is not meaningful without a defined specification and delivery location. For a comparable offer, provide the same technical and commercial details to each supplier.
Minimum order quantities and lead times are supplier- and order-dependent; they can vary with mill availability, processing requirements, and requested dimensions. Rather than assuming a standard MOQ or delivery window, ask the supplier to confirm current availability and a shipment schedule against the requested specification. If your project has a fixed launch date, share the required arrival date and allow time for technical clarification and approval.
Supplier Evaluation Checklist
- Can the supplier confirm the grade, governing standard, dimensions, and surface or coating requirements in writing?
- Can the offered mechanical-property documentation be matched to the order and coil identification?
- Are tolerances, packaging, traceability, and inspection requirements clear before purchase?
- Does the supplier explain any differences between the requested grade and the offered material instead of treating grades as automatically interchangeable?
- Can the supplier provide a quotation and availability assessment based on the actual delivery destination and order quantity?
Grade equivalence deserves particular attention in cross-border sourcing. A similar strength designation in another standard does not by itself prove identical chemical composition, mechanical properties, forming performance, or dimensional requirements. Ask for a documented comparison and obtain engineering approval before substituting a material on a production part.
How Solucky Steel Can Support Your Evaluation
At Solucky Steel, we work with B2B buyers to clarify grade, dimensions, coating, documentation, and delivery requirements for steel sourcing. We can review your requested specification, identify details that need confirmation, and discuss available supply options based on your project information. Availability, MOQ, lead time, and final commercial terms are confirmed during quotation rather than assumed in advance.
Conclusion: Is HC340/590DP the Right Grade?
HC340/590DP is a candidate for automotive components that require a combination of strength and forming capability, with typical reference properties including 340–420 MPa yield strength, 590–700 MPa tensile strength, and 17% minimum A80 elongation where the relevant specification applies. The right choice depends on the part design, forming route, coating, and governing customer or industry requirements. Confirm the exact standard and acceptance criteria before committing to production.
As a next step, prepare your grade and standard, thickness and width, coating or finish, quantity, required documentation, and delivery location. Send these details to Solucky Steel for a specification review and quotation discussion. This gives both sides a clear basis to evaluate material suitability, availability, and commercial terms.