Ni-Resist Casting Grades – Chemical Composition & Mechanical Properties
Boro Foundry supplies precision-engineered Ni-Resist castings across a range of spheroidal graphite and austenitic iron grades, including Spheroidal Graphite Ni-Resist to BS 3468:1986. These corrosion- and heat-resistant materials are ideal for applications requiring dimensional stability, wear resistance, and thermal shock tolerance. Produced to exacting specifications and suitable for complex industrial environments, our Ni-Resist castings offer consistent performance and high integrity for components in marine, automotive, and chemical processing sectors.
Chemical Composition Limits for Cast Analysis
The table below presents the chemical composition limits for our Ni-Resist casting grades, based on cast analysis. These specifications are carefully controlled to deliver the required balance of corrosion resistance, thermal stability, and mechanical performance across a variety of demanding applications.
| Grade | Standard | C % | Si % | Mn % | Ni % | Cu % | Cr % | Nb % | P % | Mg % |
|---|---|---|---|---|---|---|---|---|---|---|
| Flake Graphite | ||||||||||
| F1 | BS 3468:1986 | 3 | 1.5-2.8 | 0.5-1.5 | 13.5-17.5 | 5.5-7.5 | 1.0-2.5 | - | 0.2 | - |
| F2 | BS 3468:1986 | 3 | 1.5-2.8 | 0.5-1.5 | 18.0-22.0 | 0.5 max | 1.5-2.5 | - | 0.2 | - |
| F3 | BS 3468:1986 | 2.5 | 1.5-2.8 | 0.5-1.5 | 28.0-32.0 | 0.5 max | 2.5-3.5 | - | 0.2 | - |
| Spheroidal Graphite | ||||||||||
| S2 | BS 3468:1986 | 3 | 1.5-2.8 | 0.5-1.5 | 18.0-22.0 | 0.5 max | 1.5-2.5 | - | 0.08 | - |
| S2B | BS 3468:1986 | 3 | 1.5-2.8 | 0.5-1.5 | 18.0-22.0 | 0.5 max | 2.5-3.5 | - | 0.8 | - |
| S2C | BS 3468:1986 | 3 | 1.5-2.8 | 1.5-2.5 | 21.0-24.0 | 0.5 max | 0.5 max | - | 0.08 | - |
| S2M | BS 3468:1986 | 3 | 1.5-2.5 | 4.0-4.5 | 21.0-24.0 | 0.5 max | 0.2 max | - | 0.08 | - |
| S2W | BS 3468:1986 | 3 | 1.5-2.2 | 0.5-1.5 | 18.0-22.0 | 0.5 max | 1.5-2.2 | 0.12-0.2 | 0.5 | 0.06 max |
| S3 | BS 3468:1986 | 2.5 | 1.5-2.8 | 0.5-1.5 | 28.0-32.0 | 0.5 max | 2.5-3.5 | - | 0.08 | - |
| S5S | BS 3468:1986 | 2.2 | 4.8-5.4 | 1.0 max | 34.0-36.0 | 0.5 max | 1.5-2.5 | - | 0.08 | - |
| S6 | BS 3468:1986 | 3 | 1.5-2.8 | 6.0-7.0 | 12.0-14.0 | 0.5 max | 0.2 max | - | 0.08 | - |
Mechanical Properties
This table outlines the typical mechanical properties of our Ni-Resist grades, including proof stress, tensile strength, elongation, impact resistance, and hardness. These values help designers and engineers assess material suitability for applications involving thermal cycling, abrasive conditions, or corrosive environments.
| Grade | Standard | 0.2% Proof Stress N/mm₂ | Tensile Strength N/mm₂ | Elongation % | Charpy V-Notch Energy – J | Brinell Hardness HB |
|---|---|---|---|---|---|---|
| Flake Graphite | ||||||
| F1 | BS 3468:1986 | - | 170-240 | 1 to 2 | - | 140-220 |
| F2 | BS 3468:1986 | - | 170-240 | 1 to 3 | - | 140-220 |
| F3 | BS 3468:1986 | - | 190-240 | 1 to 3 | - | 120-215 |
| Spheroidal Graphite | ||||||
| S2 | BS 3468:1986 | 210-260 | 370-490 | 7 to 20 | 4 to 20 | 140 – 230 |
| S2B | BS 3468:1986 | 210-260 | 370-490 | 7 to 20 | 4 to 10 | 140 – 230 |
| S2C | BS 3468:1986 | 170-250 | 370-440 | 20 to 40 | 20 to 30 | 130 -170 |
| S2M | BS 3468:1986 | 210-240 | 420-470 | 25 to 45 | 15 to 25 | 150 – 180 |
| S2W | BS 3468:1986 | 210-260 | 370-490 | 7 to 20 | 10 to 20 | 140 – 200 |
| S3 | BS 3468:1986 | 210-260 | 370-470 | 7 to 18 | 4 to 20 | 130 – 200 |
| S5S | BS 3468:1986 | 210-260 | 370-470 | 7 to 20 | - | 130 – 180 |
| S6 | BS 3468:1986 | 200-260 | 390-460 | 15 to 25 | 15 to 25 | 130 – 170 |
FREQUENTLY ASKED QUESTIONS
What Ni-Resist grades do you supply?
We offer a range of spheroidal graphite Ni-Resist casting grades, including those specified in BS 3468:1986. These include both ferritic and austenitic variants designed for high corrosion and thermal resistance.
Can you produce Ni-Resist castings to custom specifications?
Yes. We can manufacture Ni-Resist castings to meet specific chemical and mechanical requirements, including adjustments for thermal expansion, wear resistance, or operating temperature.
What is the maximum casting weight for Ni-Resist components?
We can produce Ni-Resist castings up to 2 tonnes, depending on the alloy grade, design geometry, and intended application.
Are your Ni-Resist castings compliant with recognised standards?
Absolutely. Our Ni-Resist grades are produced in accordance with BS 3468:1986 and other applicable specifications, with full traceability and quality control.
What industries commonly use Ni-Resist castings?
Ni-Resist alloys are widely used in the marine, automotive, pump, and chemical processing sectors — particularly where resistance to heat, corrosion, or thermal shock is critical.