BS 6744 Grade 1.4311 Stainless Steel Reinforcement Bars
As a leading global manufacturer and exporter, Hunan Fushun Metal Co., Ltd. presents high-quality ribbed stainless steel reinforcing bars, specifically manufactured to meet the stringent requirements of BS 6744. Our Grade 1.4311 rebar is the optimal solution for reinforced concrete structures in aggressive environments where durability, low maintenance, and extended design life are non-negotiable. From marine infrastructure to chemical plants, FUSHUN METAL provides a product that ensures structural integrity for generations.
Our expertise spans a wide range of specialty steel products, including alloy steel, nickel-based alloys, and tool steel, manufactured to international benchmarks like ASTM, EN, DIN, and JIS. This deep metallurgical knowledge guarantees that our BS 6744-compliant reinforcement bars deliver unparalleled quality and performance, with this product focusing on ribbed bar, steel designation 1.4311, in strength grade 500.
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Chemical Composition (Cast Analysis)
The chemical makeup of our 1.4311 rebar provides a balanced combination of corrosion resistance and mechanical strength. It is classified under the BS EN 10088 system and, according to BS 6744 Table 5, is noted for its low magnetic permeability. The precise cast analysis is tightly controlled to fall 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) | 0.030 |
| Chromium (Cr) | 17.5 – 19.5 |
| Nickel (Ni) | 8.5 – 11.5 |
| Phosphorus (P) | 0.045 |
| Nitrogen (N) | 0.12 – 0.22 |
This composition is in strict adherence to BS 6744, Table 5 for the 1.4311 designation — a nitrogen-enhanced austenitic stainless steel. The precisely controlled nitrogen content, combined with chromium and nickel levels comparable to nickel-based alloys, delivers an exceptional balance of strength and corrosion performance without compromising the low magnetic signature.
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
The carefully controlled manufacturing process guarantees that the product is free from detrimental phases and intergranular corrosion, as verified by our rigorous testing protocol.
Dimensions, Mass, and Tolerances
We manufacture Grade 1.4311 rebar in a wide range of standard diameters, from 6 mm to 50 mm, in full compliance with BS 6744. The dimensional characteristics are precisely controlled to ensure perfect bonding with concrete.
| Grade | Nominal Diameters (mm) |
|---|---|
| 500 | 6, 7, 8, 10, 12, 14, 16, 20, 25, 32, 40, 50 |
Nominal length is 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 is calculated according to BS EN ISO 15630, with a 20 mm bar having a nominal mass of 2.482 kg/m. Stringent mass tolerances range from ±9.0% for a 6 mm bar to ±4.5% for bars over 12 mm in diameter. Non-standard diameters may also be available upon request.
Grade & Mechanical Properties (Strength Level 500, Ductility Class B)
Our reinforcing bars are designated as strength grade 500 and achieve the mechanical properties for Ductility Class B as defined in BS 6744, Table 8. The designation BS 6744 - 1.4311, B500B signifies the standard, steel grade, and performance classification.
| Property | Requirement |
|---|---|
| Designation | BS 6744 - 1.4311, B500B |
| Characteristic Yield Strength (fyk) | 500 MPa |
| 0.2% Proof Strength (Rp0.2) | 500 MPa minimum |
| 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 former of max diameter specified (4d for d≤16mm, 7d for d>16mm) |
| Fatigue Strength | Withstands 5 × 10⁶ cycles at stress ratio of 0.2 without fracture |
The strain-hardening behavior, characterized by a high strength-to-yield ratio and exceptional ductility, makes this material ideal for seismic-resistant design and other applications requiring energy absorption capacity.
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.
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 mandatory information per BS 6744, Clause 13.2:
- Standard Reference (BS 6744)
- Steel Designation (1.4311)
- Nominal Diameter
- Strength Grade (500)
- Ductility Class (B)
- Durability Class
- Cast Number and Batch Reference
- Manufacturer's Name (FUSHUN METAL)
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 and intergranular corrosion test results for the applicable designations.
- Confirmation of durability class and the manufacturer's rolled-on mark.
- A statement of conformity to BS 6744.
Frequently Asked Questions
Why choose Grade 1.4311 over other stainless steel rebar options like duplex?
Grade 1.4311 is an austenitic stainless steel selected for its excellent combination of corrosion resistance and very low magnetic permeability. While duplex grades like 1.4362 offer higher mechanical strength, 1.4311 is often the preferred choice for applications near sensitive electronic equipment, such as MRI rooms in hospitals or research facilities, where any magnetic interference must be avoided. According to BS 6744, it is specifically listed as an alloy used for low magnetic permeability.
What does the designation B500B on the product label mean?
This is a standardized code derived from BS 6744. "500" indicates the characteristic yield strength is 500 MPa. The final letter "B" stands for Ductility Class B, which guarantees a minimum stress ratio (Rm/Rp0.2) of 1.08 and a minimum total elongation at maximum force (Agt) of 5.0%, ensuring high ductility for structural safety.
How is the corrosion resistance of this rebar tested and guaranteed?
The chemical composition provides a defined level of alloying elements like chromium and nickel. As an additional verification, when specified or type-tested according to Annex A of BS 6744, 9 out of 10 specimens must not exceed a maximum current density of 80 MA/m² in a chloride-contaminated concrete environment and show no visible corrosion attack. Furthermore, every batch is tested for resistance to intergranular corrosion per BS EN ISO 3651-2.
Can FUSHUN METAL supply cut and bent fabricated reinforcement to BS 8666 schedules?
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 manufacturing capability ensures that we can deliver prefabricated cages and shapes directly to your project site, saving time and reducing on-site labor.
Source BS 6744 Grade 1.4311 Rebar from FUSHUN METAL
Contact FUSHUN METAL today to discuss your project requirements and discover how our certified stainless steel reinforcement solutions can extend the service life of your critical infrastructure. For inquiries and technical support on BS 6744 Grade 1.4311 reinforcement bars, Request a Quote and let our team provide tailored solutions, competitive pricing, and dependable global delivery.
