BS 6744 Grade 1.4462 Stainless Steel Rebar
Premium Duplex Performance for the Most Demanding Marine Environments
As a leading global manufacturer and exporter, Hunan Fushun Metal Co., Ltd. presents our premium duplex stainless steel reinforcing bars, manufactured to meet the stringent requirements of BS 6744. Our Grade 1.4462 rebar represents the gold standard in corrosion-resistant concrete reinforcement, delivering exceptional mechanical strength combined with outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. For critical infrastructure in the harshest marine and industrial environments, FUSHUN METAL provides the ultimate solution for a maintenance-free design life.
With deep expertise across specialty steel products, including alloy structural steel, nickel-based alloys, and heat resisting steel, and full compliance with international benchmarks like ASTM, EN, DIN, and JIS, we guarantee that our BS 6744-compliant reinforcement bars offer unparalleled quality and performance. This introduction focuses on our ribbed stainless steel bar, steel designation 1.4462 (commonly known as 2205 duplex), in strength grade 500.
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Technical Specifications & Compliance
Our reinforcement bars are produced and tested strictly in accordance with BS 6744, which specifies the requirements for solid stainless steel bars used for concrete reinforcement. This standard is applicable to ribbed bars in grade 500, where ribs are formed by cold working or hot rolling processes. FUSHUN METAL’s Grade 1.4462 bar is fully traceable with a documented metallurgical history, a critical requirement of the standard.
1. Chemical Composition (Cast Analysis)
The chemical makeup of our 1.4462 rebar is engineered for maximum corrosion resistance, featuring a deliberate addition of Molybdenum (Mo) and Nitrogen (N) to combat chloride-induced deterioration. It is classified under the BS EN 10088 system and, according to BS 6744 Table 5, it is among the alloys used for corrosion resistance to chloride ingress in concrete. The precise cast analysis is tightly controlled within the following limits:
| Element | Requirement (% by mass, max unless range given) |
|---|---|
| Carbon (C) | 0.03 |
| Silicon (Si) | 1.0 |
| Manganese (Mn) | 2.0 |
| Sulphur (S) | 0.015 |
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Phosphorus (P) | 0.035 |
| Nitrogen (N) | 0.10 – 0.22 |
Note: This composition is in strict adherence to BS 6744, Table 5 for the 1.4462 designation. The enhanced molybdenum range of 2.5–3.5% significantly elevates its resistance to pitting corrosion, making it the premier choice for the most aggressive chloride-exposed concrete structures.
2. Heat Treatment Condition
Our ribbed stainless steel bars are supplied in one of the following conditions as per BS 6744, Clause 11, ensuring optimal mechanical properties and surface finish:
- Hot rolled and descaled
- Hot rolled, descaled, and decooled
Per BS 6744, Clause 12.12.1, the 1.4462 duplex grade undergoes additional rigorous testing to verify the absence of detrimental metallurgical phases in the finished condition. The results are quoted directly on the test certificate, providing complete assurance of microstructural integrity.
3. Dimensions, Mass, and Tolerances
We manufacture the Grade 1.4462 rebar in a wide range of standard diameters, from 6 mm to 50 mm, in full compliance with the standard. The dimensional characteristics are precisely controlled to ensure a perfect mechanical bond with concrete.
Standard Diameters
The following nominal diameters are available as standard for the 500 strength grade, as specified in BS 6744, Clause 5 and Table 2:
| Grade | Nominal Diameters (mm) |
|---|---|
| 500 | 6, 7, 8, 10, 12, 14, 16, 20, 25, 32, 40, 50 |
Note: Non-standard diameters may also be available upon request.
- Nominal Length
- Agreed upon at the time of order, with a standard permissible deviation of +100/0 mm or as per BS 8666.
- Nominal Mass per Meter Run
- Calculated according to BS EN ISO 15630, our bars strictly conform to the specified nominal mass per meter for austenitic-ferritic (duplex) steels. For example, a 20 mm bar has a nominal mass of 2.451 kg/m.
- Tolerances on Mass
- Stringent tolerances are applied, ranging from ±9.0% for a 6 mm bar to ±4.5% for bars over 12 mm in diameter.
4. Grade & Mechanical Properties (Strength Level 500, Ductility Class B)
Our reinforcing bars are designated as strength grade 500 and consistently surpass the mechanical properties for Ductility Class B as defined in BS 6744, Table 8.
| Property | Requirement |
|---|---|
| Designation | BS 6744 – 1.4462, B500B |
| Characteristic Yield Strength (fyk) | 500 MPa |
| 0.2% Proof Strength (Rp0.2) | 500 MPa minimum |
| Tensile Strength (Rm) | Meets the minimum value for the stress ratio |
| Stress Ratio (Rm/Rp0.2) | ≥ 1.08 |
| Total Elongation at Max Force (Agt) | ≥ 5.0% |
| Elongation After Fracture (A5) | ≥ 14% |
| Bendability | Passes 180° bend test around a former of max diameter specified (e.g., 4d for d≤16 mm, 7d for d>16 mm) |
| Fatigue Strength | Withstands 5 × 106 cycles of stress at a stress ratio of 0.2 without fracture, ensuring superior dynamic load performance |
The well-balanced duplex microstructure of 1.4462 delivers an excellent combination of high strength and superior ductility, making it ideal for structures in seismic regions or those subject to extreme load conditions.
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Request a Quote5. Surface Geometry & Bonding
Ensuring a strong mechanical interlock with concrete is paramount. Our bars feature rows of crescent-shaped transverse ribs that meet the geometric criteria of BS 6744, Clause 10:
- Relative Rib Area (fR): Exceeds the minimum relative rib area (fRmin) specified in Table 6, which is the ruling criterion for bond performance.
- Rib Flank Inclination (α): Measured at ≥ 45°, ensuring effective load transfer without splitting the concrete cover.
- Transverse Rib Projection: Extends over at least 80% of the bar’s periphery.
These geometric properties are measured and verified in accordance with BS EN ISO 15630-1.
6. Packaging and Product Identification
Every product from FUSHUN METAL is meticulously packaged and labelled to guarantee complete traceability and compliance.
- Product Marking
- Each bar is identified by rolled-on legible marks on the surface at intervals not greater than 1.5 meters, identifying the manufacturer as specified by the standard.
- Bundle / Coil Labelling
- Each bundle or coil is firmly attached with a durable label containing all the mandatory information per BS 6744, Clause 13.2:
- Standard Reference (BS 6744)
- Steel Designation (1.4462)
- Nominal Diameter
- Strength Grade (500)
- Ductility Class (B)
- Durability Class
- Cast Number and Batch Reference
- Manufacturer’s Name (FUSHUN METAL)
7. Inspection & Test Report
Quality assurance is non-negotiable. Our products are tested at a frequency of one test per ten tonnes from each production batch. Every shipment is accompanied by a detailed test certificate as per Clause 12.3, which includes:
- The complete cast analysis for all specified elements.
- Results of the tensile test (including effective cross-sectional area), confirming 0.2% proof strength, stress ratio, and elongation properties.
- Results of the bend test.
- Charpy impact test results (three tests per batch, for diameters 16 mm and above), in accordance with BS EN ISO 148-1.
- Intergranular corrosion test results (one test per batch), in accordance with BS EN ISO 3651-2, confirming the absence of detrimental metallurgical phases.
- Confirmation of durability class and the manufacturer’s rolled-on mark.
- A statement of conformity to BS 6744.
Frequently Asked Questions
What makes Grade 1.4462 the premium choice for stainless steel rebar?
Grade 1.4462, commonly known as 2205 duplex stainless steel, is considered the premium standard within BS 6744 for chloride resistance due to its high molybdenum content (2.5–3.5%). This, combined with its high chromium (21.0–23.0%) and nitrogen (0.10–0.22%) content, provides exceptionally high resistance to pitting and crevice corrosion. According to BS 6744 Table 5, it is one of the key alloys for which the most academic research on chloride resistance is available, making it a trusted and well-documented material for critical infrastructure.
How does 1.4462 compare to 1.4362 for a marine project?
Both are duplex stainless steels, but the significant difference lies in the molybdenum content. Grade 1.4462 contains 2.5–3.5% molybdenum, whereas Grade 1.4362 contains only 0.10–0.60%. Molybdenum is a key alloying element that dramatically improves resistance to pitting corrosion in chloride-rich environments. Therefore, 1.4462 is specified for the most aggressive marine conditions—such as permanent immersion, heavy splash zones, or environments with warm, high-salinity seawater—while 1.4362 is an excellent value-driven choice for less severe but still corrosive exposures.
Is 1.4462 magnetic, and does this affect its use in construction?
Yes, as a duplex stainless steel, 1.4462 is ferromagnetic due to its mixed austenitic-ferritic microstructure. This is a practical characteristic that differentiates it from non-magnetic austenitic grades. On a construction site, this magnetism can be beneficial, allowing for the use of standard magnetic lifting equipment. However, it should not be specified for applications where a non-magnetic material is a primary design requirement; for those cases, an austenitic grade like 1.4311 would be recommended per guidance in BS 6744 Annex C.
What additional testing is mandatory for this premium duplex grade?
In accordance with BS 6744, Clause 12.12, all duplex grades, including 1.4462, must undergo supplementary type testing beyond standard tensile and bend tests. For every batch, we perform and certify the Charpy V-notch impact test on bars 16 mm and above (per BS EN ISO 148-1) to verify toughness, and the intergranular corrosion test (per BS EN ISO 3651-2) to confirm the product is free from harmful phases like sigma phase that could compromise both corrosion resistance and ductility.
Can FUSHUN METAL supply 1.4462 rebar in complex fabricated shapes?
Yes, absolutely. Per BS 6744, Clause 11, our ribbed stainless steel bars can be supplied straight, in coils, or fabricated in accordance with BS 8666. Our advanced bending and cutting facilities are fully equipped to process high-strength duplex material into complex reinforcing cages and bent shapes. We deliver these ready-to-install components directly to your project site, ensuring strict dimensional accuracy and full material traceability from cast to cage.
Safeguard Your Critical Infrastructure with 2205 Duplex
Contact FUSHUN METAL today to discuss how our BS 6744 Grade 1.4462 premium duplex stainless steel reinforcement can safeguard your most critical infrastructure for its entire design life.
Specify the best. Premium 2205 duplex rebar with full material certification, supplementary testing, and global logistics.
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