high-performance agglomerated calcium-silicate flux-SJ-301

SJ301 Submerged Arc Welding Flux Overview

SJ301 is an agglomerated flux with a granular structure (10-40 mesh) that excels in submerged arc welding processes. Its calcium-silicate composition provides balanced activity, ensuring minimal spatter and excellent weld pool protection against atmospheric contamination. Unlike more aggressive fluxes, SJ301 prioritizes versatility, allowing for shallow penetration at higher voltages while maintaining arc stability—key for operators handling diverse steel thicknesses.

Key Features and Benefits

• Arc Stability and Weld Quality: Offers consistent arc ignition on AC or DC power, reducing defects like pock marks and ensuring smooth, uniform beads with good edge wetting.

• Slag Removal Efficiency: The flux forms a easily detachable slag layer, speeding up post-weld cleanup and boosting overall workflow in high-volume production.

• Resistance to Contaminants: High tolerance to rust, grease, and moisture on base metals, making it suitable for real-world fabrication environments without extensive pre-cleaning.

• Compatibility: Works seamlessly with welding wires like EL8, EM12K, and EH14, delivering reliable performance in single or multi-pass welds.

• Environmental and Safety Aspects: Low hydrogen content (H5 rating per EN760) minimizes cracking risks in critical structures, and its neutral pH reduces fume emissions for safer operations.

Technical Specifications

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Mechanical Properties (with EM12K Wire)

When combined with standard wires, SJ301 achieves robust weld integrity:

• Tensile Strength: 490-670 MPa

• Yield Strength: ≥400 MPa

• Elongation: ≥22%

• Impact Toughness: ≥34J at -20°C

These properties make it outperform basic fluxes in fatigue-resistant applications.

Applications

SJ301 shines in demanding sectors where precision and reliability matter:

• Pipeline and Spiral Welded Pipes: Ideal for oil and gas infrastructure, providing clean welds on API-grade steels.

• Structural Steel Fabrication: Used in bridges, buildings, and cranes for its ability to handle low-alloy steels without notch formation.

• Machinery and Vehicles: Supports welding of agricultural equipment, trucks, and heavy machinery frames, ensuring durable joints under load.

• Boilers and Pressure Vessels: Enhances integrity in high-pressure environments, compliant with industry codes.

• Shipbuilding: Facilitates fillet and butt welds on hulls and decks, with excellent performance on marine-grade materials.

For optimal results, re-dry the flux at 300-350°C for 2 hours before use to remove any absorbed moisture.

Why Choose SJ301 for Your Projects?

This flux stands out for its balance of cost, performance, and ease-of-use, helping manufacturers reduce downtime and material waste. As a product from reputable suppliers like those in Shandong, China, it meets global export standards and is available in 25kg moisture-proof bags for easy storage.