BS 6744 Grade 1.4436 Stainless Steel Rebar
Enhanced Chloride Resistance for the Most Aggressive Environments
As a leading global manufacturer and exporter, Hunan Fushun Metal Co., Ltd. presents our premium ribbed stainless steel reinforcing bars, manufactured to meet the stringent requirements of BS 6744. Our Grade 1.4436 rebar is the definitive solution for reinforced concrete structures exposed to the most severe chloride-rich environments, such as marine splash zones, tidal areas, and de-icing salt exposure. Where exceptional durability and maximum service life are critical, FUSHUN METAL delivers a product engineered for permanent resilience.
With deep expertise across specialty steel products, including alloy steel, nickel-based alloys, and tool 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 1.4436, 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 1.4436 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 1.4436 rebar is engineered for superior resistance to pitting and crevice corrosion, thanks to a deliberate addition of Molybdenum (Mo). It is classified under the BS EN 10088 system and, according to BS 6744 Table 5, it is an “austenitic with Mo addition” alloy, recognized for its excellent corrosion resistance to chloride ingress. The precise cast analysis is tightly controlled within the following limits:
| Element | Requirement (% by mass, max unless range given) |
|---|---|
| Carbon (C) | 0.05 |
| Silicon (Si) | 1.0 |
| Manganese (Mn) | 2.0 |
| Sulphur (S) | 0.030 |
| Chromium (Cr) | 16.5 – 18.5 |
| Nickel (Ni) | 10.5 – 13.0 |
| Molybdenum (Mo) | 2.5 – 3.0 |
| Phosphorus (P) | 0.045 |
| Nitrogen (N) | ≤ 0.11 |
Note: This composition is in strict adherence to BS 6744, Table 5 for the 1.4436 designation. The Molybdenum addition significantly enhances resistance to chloride-induced corrosion, making it a step above standard austenitic grades for critical infrastructure.
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
The carefully controlled manufacturing process guarantees that the product is free from detrimental phases and intergranular corrosion, as verified by our rigorous testing protocol.
3. Dimensions, Mass, and Tolerances
We manufacture the Grade 1.4436 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 perfect bonding 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 steels with Molybdenum addition. For example, a 20 mm bar has a nominal mass of 2.514 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 achieve the mechanical properties for Ductility Class B as defined in BS 6744, Table 8.
| Property | Requirement |
|---|---|
| Designation | BS 6744 – 1.4436, 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 long-term dynamic load performance |
The high strength-to-yield ratio and superior elongation properties make this material ideal for complex structural designs, including those in seismic zones.
Ready to specify BS 6744 Grade 1.4436 stainless steel rebar for your project?
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 (1.4436)
- 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 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
What makes the 1.4436 grade superior to standard austenitic grades like 1.4301 or 1.4311 for corrosion resistance?
The key differentiator is the addition of Molybdenum (Mo). In the 1.4436 grade, the 2.5–3.0% Molybdenum content significantly elevates its resistance to pitting and crevice corrosion, particularly in environments rich in chlorides, such as seawater or de-icing salts. According to BS 6744 Table 5, 1.4436 is classified under “Austenitic with Mo addition,” a group for which the most academic research on chloride resistance is available and which has the longest historic use for this application.
How is the durability class of this product determined?
The durability class is a designated value derived from the material’s proven corrosion resistance. For grade 1.4436, this is tied to its performance when tested in accordance with BS 6744 Annex A. In this test, the steel must demonstrate a CCTL under simulated concrete pore solution conditions. The specific durability class designation will be confirmed on the manufacturer’s certification, as required by the standard.
Can the 1.4436 rebar be welded, and is it recommended?
While the chemical composition of 1.4436 is generally weldable with appropriate low-carbon filler metals, BS 6744, Clause 12.11, provides a note of caution, stating that certain major specifications (for example, the UK’s Specification for Highway Works) do not currently permit welding of stainless steel reinforcement. It is imperative to consult the relevant structural design codes and project specifications. FUSHUN METAL provides full material traceability and chemical analysis to support qualified welding procedures if permitted.
What are the typical applications where 1.4436 is the most cost-effective solution?
Although the initial cost is higher than carbon steel, 1.4436 becomes the most cost-effective life-cycle solution in structures where access for future repair or replacement is extremely difficult or impossible. Typical applications include sea wall and bridge pier splash zones, tunnel linings in aggressive ground conditions, and foundations for chemical plants. The elimination of long-term maintenance and repair costs provides a very rapid return on investment.
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 (“Scheduling, dimensioning, bending and cutting of steel reinforcement for concrete”). Our manufacturing capability ensures that we can deliver prefabricated cages and shapes directly to your project site, saving time and reducing on-site labor.
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Contact FUSHUN METAL today to discuss how our BS 6744 Grade 1.4436 stainless steel reinforcement can provide a permanent solution for your most demanding projects.
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