DIN EN 10130 ST14 Cold-Rolled Steel Coils

What are ST14 cold-rolled steel coils?

 

ST14 cold-rolled steel coils are low-carbon, high-plasticity cold-rolled steel products, produced by pickling hot-rolled steel coils to remove scale, followed by cold rolling and annealing at room temperature - a process that enhances surface smoothness, dimensional accuracy, and mechanical properties compared to hot-rolled coils. Specifically designed for intricate forming operations where ordinary steel grades would crack or wrinkle, ST14 coils offer a unique balance of ductility, strength, and surface quality, making them ideal for high-precision manufacturing scenarios.

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The table above highlights various standards and equivalents for St14 steel. While many of these grades are considered equivalent, subtle differences in composition and processing can affect performance. For example, SPCC (JIS) may have slightly different mechanical properties due to variations in manufacturing processes, which could influence the selection for specific applications.

• Chemical Composition

The primary alloying elements in St14 steel play crucial roles in its properties:
- Carbon (C): The low carbon content enhances ductility and reduces hardness, making the steel easier to form and weld.
- Manganese (Mn): Improves strength and toughness, while also aiding in deoxidation during steelmaking.
- Phosphorus (P): In small amounts, it can improve machinability but may also lead to brittleness if present in higher concentrations.

• Mechanical Properties

The mechanical properties of St14 steel make it suitable for applications that require good formability and moderate strength. Its tensile strength and yield strength are adequate for many structural applications, while its elongation indicates excellent ductility, allowing for significant deformation during processing.

• Physical Properties

• Weldability of St14 Steel

St14 steel is highly weldable, making it suitable for various welding processes. The low carbon content reduces the risk of cracking during welding, and preheating may be necessary for thicker sections to avoid thermal stresses. Post-weld heat treatment can further enhance the properties of the weld joint.

1. What is the difference between ST14 cold-rolled steel coils and other cold-rolled grades (ST12, ST13)?

ST14 is a deep-drawing grade with higher plasticity (elongation ≥36%) compared to ST12 (commercial grade, elongation ≥28%) and ST13 (drawing grade, elongation ≥32%). ST14 offers superior formability for the most complex deep drawing applications, while ST12 is suitable for basic forming and ST13 for general drawing needs. ST12 is equivalent to DC01/SPCC, ST13 to DC03/SPCD, and ST14 to DC04/SPCE.

2. Is ST14 cold-rolled steel coil equivalent to other international steel grades?

Yes. ST14 (DIN 1623) is fully equivalent to DC04 (EN 10130), SPCE (JIS G 3141), and 08AL (Chinese GB) grades. These grades share similar chemical composition, mechanical properties, and formability, making them interchangeable in most applications.

3. What thickness and width ranges are available for ST14 cold-rolled steel coils?

We supply ST14 cold-rolled steel coils in thicknesses from 0.3mm to 2.5mm and widths from 800mm to 1830mm. Standard widths are 1000mm, 1250mm, and 1500mm, with custom sizes available upon request. Thicknesses can also be tailored to your specific production needs, from 0.3mm up to 2.5mm.

4. What surface finishes are available for ST14 cold-rolled steel coils?

We offer two standard surface qualities: FC (high-quality finish) for visible components and coating applications, and FB (general finish) for standard forming operations. Additionally, we provide special surface treatments, including oiled (to prevent rust), passivated, and anti-fingerprint, to meet specific post-processing requirements. The oil film used is removable with alkali solution, ensuring compatibility with painting and coating processes.

5. Can ST14 cold-rolled steel coils be welded?

Absolutely. ST14's low carbon content (max 0.08%) and controlled chemical composition provide excellent weldability. It is compatible with all common welding methods, including MIG, TIG, resistance welding, and spot welding, requiring no special electrodes and enabling easy integration into assembly processes.

6. What is the typical delivery time for ST14 cold-rolled steel coil orders?

For in-stock standard ST14 coils, delivery is 7-15 days worldwide. Custom orders or large-volume orders (full container loads) typically require 15-30 days, depending on the specific specifications (thickness, width, surface treatment) and order quantity. We prioritize on-time delivery to ensure your production schedule is not disrupted.

7. What storage conditions are required for ST14 cold-rolled steel coils?

ST14 cold-rolled steel coils should be stored in a dry, ventilated indoor environment to prevent moisture-induced oxidation. We recommend storing them with our standard packaging (anti-rust paper, plastic film) to maintain surface quality. Oiled coils are guaranteed to be rust-free for 6 months under normal storage, transportation, and handling conditions. If non-oiled coils are requested, the supplier is not responsible for rust or scratches caused by lack of oil coating.

8. Can I get free samples of ST14 cold-rolled steel coils for testing?

Yes. We offer free samples (typically 300mm × 300mm) for material testing and forming trials. Customers only need to cover the shipping cost. Our samples are representative of our bulk products, ensuring you can verify the quality, formability, and performance before placing a bulk order. Contact our sales team to request samples today.

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