BS 6744 Grade 1.4162 Stainless Steel Rebar
High-Strength Duplex Solution for Aggressive Chloride Environments
As a leading global manufacturer and exporter, Hunan Fushun Metal Co., Ltd. presents our advanced duplex stainless steel reinforcing bars, manufactured to meet the stringent requirements of BS 6744. Our Grade 1.4162 rebar offers a unique combination of high mechanical strength and outstanding corrosion resistance, making it the optimal choice for reinforced concrete structures in the most demanding chloride-rich environments. Where both structural performance and long-term durability are critical, FUSHUN METAL delivers an engineered solution that outperforms conventional materials.
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 1.4162, 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 1.4162 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 1.4162 rebar is engineered to deliver the exceptional strength and corrosion resistance characteristic of duplex stainless steels. It is classified under the BS EN 10088 system and, according to BS 6744 Table 5, it is an “austenitic-ferritic (Duplex)” alloy listed among those 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) | 0.04 |
| Silicon (Si) | 1.0 |
| Manganese (Mn) | 4.0 – 6.0 |
| Sulphur (S) | 0.015 |
| Chromium (Cr) | 21.0 – 22.0 |
| Nickel (Ni) | 1.35 – 1.70 |
| Molybdenum (Mo) | 0.10 – 0.80 |
| Copper (Cu) | 0.10 – 0.80 |
| Phosphorus (P) | 0.040 |
| Nitrogen (N) | 0.20 – 0.25 |
Note: This composition is in strict adherence to BS 6744, Table 5 for the 1.4162 designation. This low-nickel, nitrogen-enhanced duplex grade offers a cost-stable alternative with a balanced microstructure that provides both high yield strength and excellent chloride resistance.
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 1.4162 duplex grade undergoes additional testing to ensure the absence of detrimental metallurgical phases in the finished condition. The results of these tests are quoted directly on the test certificate, providing full assurance of microstructural integrity.
3. Dimensions, Mass, and Tolerances
We manufacture the Grade 1.4162 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-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 achieve the mechanical properties for Ductility Class B as defined in BS 6744, Table 8.
| Property | Requirement |
|---|---|
| Designation | BS 6744 – 1.4162, 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 |
Note: While the minimum requirements for grade 500 are as stated, the duplex microstructure of 1.4162 typically delivers a significantly higher characteristic yield strength, offering designers an inherent safety margin and the potential for material optimization.
Ready to specify high-strength BS 6744 Grade 1.4162 duplex stainless steel rebar?
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 (1.4162)
- 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 is the key advantage of choosing a duplex grade like 1.4162 over an austenitic grade like 1.4311?
The primary advantage is the combination of higher strength and excellent corrosion resistance within a cost-effective alloy design. The duplex microstructure of 1.4162 delivers significantly higher yield strength than standard austenitic grades, while its chromium, molybdenum, and nitrogen content provides strong resistance to chloride-induced pitting. Additionally, its lower nickel content offers greater price stability.
Why are additional tests like the Charpy impact test and intergranular corrosion test required for 1.4162?
According to BS 6744, Clause 12.12.1, duplex designations such as 1.4162 must undergo these supplementary tests to verify that the manufacturing process has not introduced any detrimental metallurgical phases that could compromise toughness or corrosion resistance in the finished product. These results are mandatory information on the test certificate, giving you full confidence in the material’s long-term performance.
What are the typical applications where 1.4162 would be specified?
Grade 1.4162 is ideally suited for structurally demanding applications in highly aggressive environments. Typical examples include marine quay walls, bridge piers in tidal zones, seawall reinforcements, and foundations for industrial facilities where both high mechanical loads and extreme chloride exposure are design factors.
Is the 1.4162 duplex rebar magnetic?
Yes, unlike fully austenitic grades (e.g., 1.4301 or 1.4311) which have very low magnetic permeability, duplex stainless steels like 1.4162 are ferromagnetic. This is due to their mixed austenitic-ferritic microstructure. The standard provides guidance on magnetic properties in Annex C, and this characteristic can be an advantage in certain construction scenarios, such as when magnetic lifting equipment is used.
Can FUSHUN METAL supply the 1.4162 rebar in bespoke lengths and 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 (“Scheduling, dimensioning, bending and cutting of steel reinforcement for concrete”). Our advanced processing capability allows us to deliver ready-to-install reinforcing cages and complex bent shapes directly to your project, accelerating construction timelines.
Optimize Your Project with Duplex Stainless Steel Reinforcement
Contact FUSHUN METAL today to explore how our BS 6744 Grade 1.4162 duplex stainless steel reinforcement can optimize the performance and life-cycle cost of your next project.
Specify with confidence. Full mill certification, supplementary duplex testing, and global logistics included.
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