HC340/590DP Dual Phase Steel: Properties, Applications, and Specifications
HC340/590DP is a cold-forming dual-phase steel grade used when a component needs a combination of strength and formability. In the grade designation, “340” and “590” indicate strength levels in megapascals (MPa); they are not a complete substitute for the mechanical-property limits in the governing standard or purchase specification. Buyers should confirm the applicable standard, thickness, coating condition, and delivery requirements before comparing offers. This guide explains how to assess the grade, match it to an application, and prepare a practical sourcing inquiry.
Who This Guide Is For
This guide is for automotive and industrial buyers, product engineers, steel service centers, and procurement teams evaluating cold-rolled HC340/590DP. It is useful when you are replacing a lower-strength grade, developing a formed component, or comparing material offers from different suppliers. The information supports initial screening, but it does not replace a drawing review, forming trial, or agreement on a material standard. If your part has critical safety or fatigue requirements, involve your design and quality teams before material approval.
What HC340/590DP Means
HC340/590DP is a high-strength dual-phase steel for cold forming. “HC” identifies a cold-rolled product family in common European-style grade naming, while “DP” refers to a dual-phase microstructure, typically consisting mainly of ferrite and harder martensitic regions. The ferrite supports forming, while the harder phase contributes to strength. The exact composition, microstructure, and guaranteed properties depend on the relevant product standard and the supplier’s agreed specification.
Strength designation and property verification
The numbers 340 MPa and 590 MPa are useful strength-class identifiers, but buyers should not assume they alone define the full acceptance criteria. Depending on the standard and product condition, the specification may state yield strength, tensile strength, elongation, and other requirements as ranges or minimum values. Obtain the applicable standard and the supplier’s inspection documentation for the exact ordered grade. Treat any published typical value as guidance rather than a guarantee unless it is explicitly included in the agreed purchase specification.
Material Overview and Key Specifications
HC340/590DP is generally considered where designers want higher strength than conventional mild forming steel while retaining useful cold-forming capability. Its performance is affected not only by the grade name but also by thickness, width, surface condition, edge quality, and forming direction. A coating, if required, can also influence part processing and surface requirements. For that reason, a complete specification should describe the product form and condition as well as the steel grade.
| Specification item | What to confirm | Why it matters |
|---|---|---|
| Grade and standard | HC340/590DP designation, governing standard, and any customer-specific requirements | Grade names may be used across different commercial documents, while guaranteed limits must come from the agreed standard or order. |
| Mechanical properties | Yield strength, tensile strength, elongation, and test direction where specified | These values help determine whether the material meets design and forming requirements. |
| Dimensions | Nominal thickness, width, dimensional tolerances, and coil or sheet format | Dimensional fit affects tooling, nesting, material utilization, and downstream processing. |
| Surface and finish | Surface quality, oiling, coating status, and packaging requirements | These details affect handling, storage, welding, painting, and appearance expectations. |
| Inspection documents | Required test certificate, traceability, and inspection records | Clear documentation supports incoming inspection and material approval. |
Applications and Material Matching
HC340/590DP may be considered for formed automotive and industrial components where strength-to-weight performance and formability both matter. Potential applications can include structural reinforcements, brackets, and other stamped parts, subject to engineering validation and the applicable design requirements. The grade is not automatically suitable for every component simply because its strength class appears appropriate. Part geometry, loading, joining method, corrosion exposure, and forming severity all influence material selection.
When to consider a dual-phase grade
Consider HC340/590DP when a part needs more strength than a lower-strength forming steel can provide and the manufacturing route relies on cold forming. Compare the material against alternative grades using the actual component requirements rather than strength designation alone. A forming simulation or controlled production trial may be appropriate for complex shapes, tight radii, or demanding dimensional tolerances. Confirm that the selected grade is compatible with the intended welding, coating, and finishing processes.
Buyer Selection Framework
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Define the component and its requirements.
Share the part’s function, drawing revision, expected loads, forming operations, and any critical surface or corrosion requirements. Identify whether the material is for a prototype, trial, or production order. This context helps a supplier assess the request without treating the grade name as the only selection criterion.
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Set the governing specification.
State the required standard and edition, or provide the customer specification that controls acceptance. List the required mechanical properties and any additional testing or documentation. If requirements are not finalized, identify them as open points rather than assuming typical values are contractually guaranteed.
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Confirm dimensions and product condition.
Specify thickness, width, coil or sheet format, tolerance needs, surface condition, coating, and packaging. For example, a request for 1.0 mm material should identify whether 1.0 mm is the nominal thickness and what tolerance applies. Confirm that the requested format is compatible with your slitting, blanking, and forming equipment.
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Validate process performance.
Review the proposed material against tooling, bend radii, draw depth, joining, and surface-treatment requirements. Where performance is uncertain, agree on a sample or trial plan and acceptance criteria before production release. Do not rely on a grade substitution without engineering approval.
Pricing, MOQ, and Lead Time
Price and delivery depend on the ordered dimensions, product condition, quantity, processing needs, packaging, and market conditions at the time of quotation. Minimum order quantities can vary with mill availability, coil size, slitting requirements, and the supplier’s production or stocking plan. Lead time should be confirmed against the actual specification and quantity rather than inferred from a general product description. When requesting an offer, ask the supplier to state the quotation validity, delivery basis, and any assumptions affecting price or schedule.
Supplier Evaluation Checklist
- Can the supplier confirm the exact grade, standard, and property limits offered?
- Can the supplier provide the requested thickness, width, condition, and delivery format?
- Are inspection documents, lot identification, and traceability aligned with your requirements?
- Does the quotation clearly identify coating, surface, tolerances, packaging, and delivery terms?
- Can technical questions be addressed before you release tooling or production material?
Ask for written confirmation of deviations or substitutions. If the offer uses a similar grade name, request a side-by-side comparison of the controlling properties and standards. This is especially important when material is being approved against an established drawing or customer requirement. A clear specification reduces the risk of comparing unlike products on price alone.
Working With Solucky Steel
At Solucky Steel, we support B2B buyers evaluating HC340/590DP by reviewing the requested grade, dimensions, surface condition, quantity, and documentation needs. Availability, order quantity, and delivery timing depend on the specific inquiry and must be confirmed in the quotation. We can also help identify missing specification details so that the offer can be matched more closely to your application. Final material approval remains with the buyer’s engineering and quality teams.
Key Takeaways and Next Steps
HC340/590DP is a cold-forming dual-phase steel identified by the 340 MPa and 590 MPa strength-class figures in its designation, but those figures do not replace a complete standard or purchase specification. Its suitability depends on the part design, forming route, surface requirements, and verified mechanical properties. Before purchasing, define the governing standard, dimensions, product condition, inspection documents, and trial requirements. To request a quotation from Solucky Steel, send your grade and standard, thickness and width, quantity, required condition, delivery location, and any drawing or customer-specific requirements for review.