Ni-Hard castings are abrasion-resistant white cast irons containing nickel and chromium alloying elements. These materials are developed to provide excellent wear resistance through hard carbide phases supported by an alloyed metallic matrix.
Ni-Hard cast iron is widely used for components exposed to abrasive particles, grinding operations and continuous material movement. Its properties make it suitable for applications where wear resistance is more important than ductility or resistance to severe impact.
Ni-Hard cast iron derives its abrasion resistance from a combination of hard carbides and a nickel-chromium alloyed metallic matrix. These microstructural features help withstand the abrasive action of minerals, coal, aggregates and other hard materials.
The microstructure helps resist abrasive wear from minerals, coal, aggregates and other hard materials.
Hard carbide phases help resist scratching, cutting and abrasive surface deterioration.
Nickel improves hardenability and supports the formation of hard matrix structures under appropriate processing conditions.
Chromium contributes to carbide formation and influences the alloy’s wear-resistant microstructure.
Where applicable, controlled heat treatment helps achieve the required matrix structure, hardness and wear characteristics.
Work Hardening & Service Performance
Ni-Hard is a family of nickel-chromium white cast irons whose abrasion resistance comes primarily from hard carbides supported by an alloyed metallic matrix. The matrix structure depends on the grade, casting section and heat treatment.
Work hardening means an increase in hardness caused by plastic deformation. In suitable Ni-Hard structures, retained austenite may strengthen during abrasion and can transform locally under appropriate conditions. This response varies with the alloy and service loading; it is not a guaranteed property of every Ni-Hard casting.
Ni-Hard components are selected for carbide-based abrasion resistance in their specified delivery condition. Required hardness and microstructure should be established before service rather than relying on an initial impact period.
Retained austenite can contribute to local surface strengthening under suitable abrasive deformation. Its amount and stability matter: more retained austenite does not automatically mean better hardness, wear life or resistance to fracture.
Ni-Hard grade, alloy balance, cooling rate and any specified heat treatment determine the carbide structure and matrix. Thermal treatment develops the delivery condition; service-induced work hardening is a separate mechanism.
Ni-Hard combines hard carbide phases with a nickel-chromium alloyed metallic matrix. This structure supports abrasion resistance, material hardness and reliable service life in suitable grinding and material-handling applications.
Hard carbide phases help resist abrasive particles, cutting and continuous surface wear.
01An alloyed matrix supports hard carbides to limit scratching and gradual material removal.
02Suitable grade selection helps extend component life and reduce wear-related replacements.
03A practical material option for selected grinding, abrasion and material-handling duties.
04Ni-Hard is a nickel-chromium white cast iron family for abrasion-resistant service. Specify the material using an applicable cast-iron standard, the exact grade, required hardness and delivery condition.
ASTM, EN and Indian designations describe their own grade systems. Similar Ni-Hard families are not automatically interchangeable: chemistry, section thickness, heat treatment and testing requirements must match the component specification.
| No. | Country / Region | Applicable Standard / Route | Ni-Hard Grades / Coverage |
|---|---|---|---|
| 01 |  India | IS 4771:1985 — Types 1a / 1b | NiLCr 30/500, NiLCr 34/550; NiHCr 27/500, NiHCr 30/550, NiHCr 34/600. |
| 02 |  USA | ASTM A532/A532M | Class I Type A (Ni-Hard 1), Type B (Ni-Hard 2), Type D (Ni-Hard 4). |
| 03 |  Germany | DIN EN 12513 | Ni-Cr families: approx. 4% Ni / 2% Cr and 5% Ni / 9% Cr; specify the exact hardness grade. |
| 04 |  Europe / CEN | EN 12513 | Ni-Cr families: approx. 4% Ni / 2% Cr and 5% Ni / 9% Cr; specify the exact hardness grade. |
| 05 |  China | ASTM A532/A532M — contract-selected route | Class I Type A (Ni-Hard 1), Type B (Ni-Hard 2), Type D (Ni-Hard 4). |
| 06 |  Japan | ISO 21988 — contract-selected route | Nickel-chromium abrasion-resistant white iron families; agree chemistry and hardness. |
| 07 |  United Kingdom | BS EN 12513 | Ni-Cr families: approx. 4% Ni / 2% Cr and 5% Ni / 9% Cr; specify the exact hardness grade. |
| 08 |  France | NF EN 12513 | Ni-Cr families: approx. 4% Ni / 2% Cr and 5% Ni / 9% Cr; specify the exact hardness grade. |
| 09 |  Italy | UNI EN 12513 | Ni-Cr families: approx. 4% Ni / 2% Cr and 5% Ni / 9% Cr; specify the exact hardness grade. |
| 10 |  Australia | ISO 21988 — contract-selected route | Nickel-chromium white iron families; specify delivery condition and hardness. |
| 11 |  South Korea | ASTM A532/A532M — contract-selected route | Class I Type A (Ni-Hard 1), Type B (Ni-Hard 2), Type D (Ni-Hard 4). |
| 12 |  Spain | UNE-EN 12513 | Ni-Cr families: approx. 4% Ni / 2% Cr and 5% Ni / 9% Cr; specify the exact hardness grade. |
| 13 |  Sweden | SS-EN 12513 | Ni-Cr families: approx. 4% Ni / 2% Cr and 5% Ni / 9% Cr; specify the exact hardness grade. |
| 14 |  Norway | NS-EN 12513 | Ni-Cr families: approx. 4% Ni / 2% Cr and 5% Ni / 9% Cr; specify the exact hardness grade. |
| 15 |  South Africa | ASTM A532/A532M — contract-selected route | Class I Type A (Ni-Hard 1), Type B (Ni-Hard 2), Type D (Ni-Hard 4). |
| 16 |  Brazil | ISO 21988 — contract-selected route | Nickel-chromium white iron families; exact grade agreed in the purchase specification. |
Contract-selected routes are international options, not claims of national adoption or exact equivalence. Confirm the applicable edition, full grade, chemistry, hardness, heat treatment and inspection requirements before ordering. Ni-Hard names alone do not establish compliance.
Technical references: ASTM A532/A532M · EN 12513 · ISO 21988 · IS 4771
Select a standard to explore nickel-chromium abrasion-resistant white iron grades and composition values in mass %. Grade systems and delivery requirements differ between standards.
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| NiLCr 30/500 · Type 1a | 2.7–3.3 | 0.3–0.6 | 0.3–0.6 | ≤0.30 | ≤0.15 | 1.5–2.5 | 3.0–5.5 | ≤0.5 | — |
| NiLCr 34/550 · Type 1a | 3.2–3.6 | 0.3–0.6 | 0.3–0.6 | ≤0.30 | ≤0.15 | 1.5–2.5 | 3.0–5.5 | ≤0.5 | — |
| NiHCr 27/500 · Type 1b | 2.5–2.9 | 1.5–2.2 | 0.3–0.6 | ≤0.30 | ≤0.15 | 8.0–10.0 | 4.0–6.0 | ≤0.5 | — |
| NiHCr 30/550 · Type 1b | 2.8–3.3 | 1.5–2.2 | 0.3–0.6 | ≤0.30 | ≤0.15 | 8.0–10.0 | 4.0–6.0 | ≤0.5 | — |
| NiHCr 34/600 · Type 1b | 3.2–3.6 | 1.5–2.2 | 0.3–0.6 | ≤0.30 | ≤0.15 | 7.5–9.5 | 4.0–6.0 | ≤0.5 | — |
IS grade designations are independent of ASTM Ni-Hard type names; compare the full specification before substitution. Mass %. ≤ denotes a maximum; — means no value is provided in this summary, not zero. Iron is the balance. Confirm the ordered grade and edition before manufacture.
Reference: IS 4771:1985 · Table 1
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| Class I Type A · Ni-Hard 1 | 2.8–3.6 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.4–4.0 | 3.3–5.0 | ≤1.0 | — |
| Class I Type B · Ni-Hard 2 | 2.4–3.0 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.4–4.0 | 3.3–5.0 | ≤1.0 | — |
| Class I Type C · Ni-Cr-GB | 2.5–3.7 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.0–2.5 | ≤4.0 | ≤1.0 | — |
| Class I Type D · Ni-Hard 4 | 2.5–3.6 | ≤2.0 | ≤2.0 | ≤0.10 | ≤0.15 | 7.0–11.0 | 4.5–7.0 | ≤1.5 | — |
Values transcribed from ASTM A532/A532M-10 (2014), Table 1. Confirm the edition specified by the purchase order. Mass %. ≤ denotes a maximum; — means no value is provided in this summary, not zero. Iron is the balance. Confirm the ordered grade and edition before manufacture.
Reference: ASTM A532/A532M · Table 1
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| EN-GJN-HB480 · 5.5602 | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB500 · 5.5603 | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| EN-GJN-HB510 · 5.5604 | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB555 · 5.5605 | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.08 | ≤0.08 | 8.0–10.0 | 4.5–6.5 | — | — |
| EN-GJN-HB630 · 5.5606 | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
Composition in mass % from EN 12513:2011, Table 2. ≤ indicates a maximum. Dashes indicate values omitted from this summary.
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| EN-GJN-HB480 · 5.5602 | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB500 · 5.5603 | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| EN-GJN-HB510 · 5.5604 | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB555 · 5.5605 | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.08 | ≤0.08 | 8.0–10.0 | 4.5–6.5 | — | — |
| EN-GJN-HB630 · 5.5606 | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
Composition in mass % from EN 12513:2011, Table 2. ≤ indicates a maximum. Dashes indicate values omitted from this summary.
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| Class I Type A · Ni-Hard 1 | 2.8–3.6 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.4–4.0 | 3.3–5.0 | ≤1.0 | — |
| Class I Type B · Ni-Hard 2 | 2.4–3.0 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.4–4.0 | 3.3–5.0 | ≤1.0 | — |
| Class I Type C · Ni-Cr-GB | 2.5–3.7 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.0–2.5 | ≤4.0 | ≤1.0 | — |
| Class I Type D · Ni-Hard 4 | 2.5–3.6 | ≤2.0 | ≤2.0 | ≤0.10 | ≤0.15 | 7.0–11.0 | 4.5–7.0 | ≤1.5 | — |
ASTM applies when specified in the purchase contract. Values transcribed from ASTM A532/A532M-10 (2014), Table 1. Confirm the edition specified by the purchase order. Mass %. ≤ denotes a maximum; — means no value is provided in this summary, not zero. Iron is the balance. Confirm the ordered grade and edition before manufacture.
Reference: ASTM A532/A532M · Table 1
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| BTMNi4Cr2-DT | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| BTMNi4Cr2-GT | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| BTMCr9Ni5-DT | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| BTMCr9Ni5-ZT | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.5–6.5 | — | — |
| BTMCr9Ni5-GT | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
DT, ZT and GT distinguish carbon levels within the Chinese grade system. These are not automatic ASTM equivalents. Mass %. ≤ denotes a maximum; — means no value is provided in this summary, not zero. Iron is the balance. Confirm the ordered grade and edition before manufacture.
Reference: GB/T 8263-2025 · Table 1
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| ISO 21988/JN/HBW480Cr2 | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| ISO 21988/JN/HBW510Cr2 | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| ISO 21988/JN/HBW500Cr9 | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| ISO 21988/JN/HBW555Cr9 | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.08 | ≤0.08 | 8.0–10.0 | 4.5–6.5 | — | — |
| ISO 21988/JN/HBW630Cr9 | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
Contract-selected ISO route. Composition in mass % from a published foundry reference. Confirm acceptance limits against ISO 21988:2006 Table 2. ≤ indicates a maximum. Dashes indicate values omitted from this summary.
Reference: ISO 21988:2006 · Grade chemistry reference
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| EN-GJN-HB480 · 5.5602 | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB500 · 5.5603 | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| EN-GJN-HB510 · 5.5604 | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB555 · 5.5605 | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.08 | ≤0.08 | 8.0–10.0 | 4.5–6.5 | — | — |
| EN-GJN-HB630 · 5.5606 | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
Composition in mass % from EN 12513:2011, Table 2. ≤ indicates a maximum. Dashes indicate values omitted from this summary.
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| EN-GJN-HB480 · 5.5602 | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB500 · 5.5603 | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| EN-GJN-HB510 · 5.5604 | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB555 · 5.5605 | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.08 | ≤0.08 | 8.0–10.0 | 4.5–6.5 | — | — |
| EN-GJN-HB630 · 5.5606 | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
Composition in mass % from EN 12513:2011, Table 2. ≤ indicates a maximum. Dashes indicate values omitted from this summary.
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| EN-GJN-HB480 · 5.5602 | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB500 · 5.5603 | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| EN-GJN-HB510 · 5.5604 | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB555 · 5.5605 | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.08 | ≤0.08 | 8.0–10.0 | 4.5–6.5 | — | — |
| EN-GJN-HB630 · 5.5606 | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
Composition in mass % from EN 12513:2011, Table 2. ≤ indicates a maximum. Dashes indicate values omitted from this summary.
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| ISO 21988/JN/HBW480Cr2 | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| ISO 21988/JN/HBW510Cr2 | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| ISO 21988/JN/HBW500Cr9 | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| ISO 21988/JN/HBW555Cr9 | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.08 | ≤0.08 | 8.0–10.0 | 4.5–6.5 | — | — |
| ISO 21988/JN/HBW630Cr9 | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
Contract-selected ISO route. Composition in mass % from a published foundry reference. Confirm acceptance limits against ISO 21988:2006 Table 2. ≤ indicates a maximum. Dashes indicate values omitted from this summary.
Reference: ISO 21988:2006 · Grade chemistry reference
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| Class I Type A · Ni-Hard 1 | 2.8–3.6 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.4–4.0 | 3.3–5.0 | ≤1.0 | — |
| Class I Type B · Ni-Hard 2 | 2.4–3.0 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.4–4.0 | 3.3–5.0 | ≤1.0 | — |
| Class I Type C · Ni-Cr-GB | 2.5–3.7 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.0–2.5 | ≤4.0 | ≤1.0 | — |
| Class I Type D · Ni-Hard 4 | 2.5–3.6 | ≤2.0 | ≤2.0 | ≤0.10 | ≤0.15 | 7.0–11.0 | 4.5–7.0 | ≤1.5 | — |
ASTM applies when specified in the purchase contract. Values transcribed from ASTM A532/A532M-10 (2014), Table 1. Confirm the edition specified by the purchase order. Mass %. ≤ denotes a maximum; — means no value is provided in this summary, not zero. Iron is the balance. Confirm the ordered grade and edition before manufacture.
Reference: ASTM A532/A532M · Table 1
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| EN-GJN-HB480 · 5.5602 | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB500 · 5.5603 | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| EN-GJN-HB510 · 5.5604 | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB555 · 5.5605 | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.08 | ≤0.08 | 8.0–10.0 | 4.5–6.5 | — | — |
| EN-GJN-HB630 · 5.5606 | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
Composition in mass % from EN 12513:2011, Table 2. ≤ indicates a maximum. Dashes indicate values omitted from this summary.
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| EN-GJN-HB480 · 5.5602 | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB500 · 5.5603 | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| EN-GJN-HB510 · 5.5604 | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB555 · 5.5605 | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.08 | ≤0.08 | 8.0–10.0 | 4.5–6.5 | — | — |
| EN-GJN-HB630 · 5.5606 | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
Composition in mass % from EN 12513:2011, Table 2. ≤ indicates a maximum. Dashes indicate values omitted from this summary.
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| EN-GJN-HB480 · 5.5602 | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB500 · 5.5603 | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| EN-GJN-HB510 · 5.5604 | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| EN-GJN-HB555 · 5.5605 | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.08 | ≤0.08 | 8.0–10.0 | 4.5–6.5 | — | — |
| EN-GJN-HB630 · 5.5606 | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
Composition in mass % from EN 12513:2011, Table 2. ≤ indicates a maximum. Dashes indicate values omitted from this summary.
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| Class I Type A · Ni-Hard 1 | 2.8–3.6 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.4–4.0 | 3.3–5.0 | ≤1.0 | — |
| Class I Type B · Ni-Hard 2 | 2.4–3.0 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.4–4.0 | 3.3–5.0 | ≤1.0 | — |
| Class I Type C · Ni-Cr-GB | 2.5–3.7 | ≤0.8 | ≤2.0 | ≤0.30 | ≤0.15 | 1.0–2.5 | ≤4.0 | ≤1.0 | — |
| Class I Type D · Ni-Hard 4 | 2.5–3.6 | ≤2.0 | ≤2.0 | ≤0.10 | ≤0.15 | 7.0–11.0 | 4.5–7.0 | ≤1.5 | — |
ASTM applies when specified in the purchase contract. Values transcribed from ASTM A532/A532M-10 (2014), Table 1. Confirm the edition specified by the purchase order. Mass %. ≤ denotes a maximum; — means no value is provided in this summary, not zero. Iron is the balance. Confirm the ordered grade and edition before manufacture.
Reference: ASTM A532/A532M · Table 1
| Grade / Family | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|---|
| ISO 21988/JN/HBW480Cr2 | 2.5–3.0 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| ISO 21988/JN/HBW510Cr2 | 3.0–3.6 | ≤0.8 | ≤0.8 | ≤0.10 | ≤0.10 | 1.5–3.0 | 3.0–5.5 | — | — |
| ISO 21988/JN/HBW500Cr9 | 2.4–2.8 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
| ISO 21988/JN/HBW555Cr9 | 2.5–3.5 | 1.5–2.5 | 0.3–0.8 | ≤0.08 | ≤0.08 | 8.0–10.0 | 4.5–6.5 | — | — |
| ISO 21988/JN/HBW630Cr9 | 3.2–3.6 | 1.5–2.2 | 0.2–0.8 | ≤0.06 | ≤0.06 | 8.0–10.0 | 4.0–5.5 | — | — |
Contract-selected ISO route. Composition in mass % from a published foundry reference. Confirm acceptance limits against ISO 21988:2006 Table 2. ≤ indicates a maximum. Dashes indicate values omitted from this summary.
Reference: ISO 21988:2006 · Grade chemistry reference
Bhanu Special Castings offers application-oriented Ni-Hard casting solutions for industrial equipment exposed to continuous abrasive wear.
Wear-resistant castings designed to protect grinding equipment against abrasive materials.
Components developed for selected coal and mineral grinding equipment.
Protective castings for material handling equipment operating in abrasive conditions.
Selected wear-resistant castings for solids-handling and slurry processing equipment.
Wear protection components for selected abrasive processing applications.
Custom-engineered components manufactured according to customer drawings and technical specifications.
Review the component application, abrasive material, impact level and operating environment to select a suitable Ni-Hard grade. Required hardness, casting section and customer specifications guide the alloy and delivery condition.
Develop or verify patterns against the approved component drawing, geometry and dimensional requirements. Include suitable casting allowances, machining allowances and identification features for repeatable mould production.
Prepare moulds, cores and feeding arrangements to suit the component shape and casting section. Check mould condition, core positioning and gating before pouring to support controlled filling and sound solidification.
Melt the selected charge and control nickel, chromium, carbon and other specified elements. Verify melt chemistry against the agreed material grade and make permitted adjustments before releasing the metal for pouring.
Pour molten metal into prepared moulds using suitable temperature and handling controls. Filling, feeding and cooling practices are selected for the casting geometry to limit defects and support the intended carbide and matrix structure.
Remove moulding material after the casting has cooled appropriately. Separate runners and risers, remove unwanted projections and clean the surface for subsequent heat treatment, finishing and inspection.
Apply grade-specific heat treatment where required by the material specification or order. The selected cycle accounts for casting section and delivery requirements to develop the intended matrix, hardness and service characteristics.
Finish specified surfaces, bores and dimensions using processes suited to the hardness and geometry of Ni-Hard. Check drawing requirements and use appropriate tooling to achieve the agreed fit, tolerances and surface condition.
Verify the casting against agreed chemistry, hardness, dimensional, visual and any specified mechanical or additional inspection requirements. Complete identification, documentation and suitable packing before dispatch.
Ni-Hard grades combine high hardness and abrasion resistance with grade-dependent strength and physical properties. Select the material for the wear mechanism, casting section and specified delivery condition.
| Grade / Casting Route | Typical Hardness (Brinell) | Typical Tensile Strength (MPa) | Elastic Modulus (GPa) |
|---|---|---|---|
| Ni-Hard 1 · Sand cast | 550–690 | 280–350 | 169–183 |
| Ni-Hard 1 · Chill cast | 600–730 | 350–420 | 169–183 |
| Ni-Hard 2 · Sand cast | 530–630 | 320–390 | 169–183 |
| Ni-Hard 2 · Chill cast | 580–680 | 420–530 | 169–183 |
| Ni-Hard 4 | 550–700 | 500–600 | 190–200 |
| Property / Grade | Typical Value |
|---|---|
| Density · Ni-Hard 1 & 2 | 7.6–7.8 g/cm³ |
| Density · Ni-Hard 4 | Approx. 7.75 g/cm³ |
| Thermal conductivity at 20°C · Ni-Hard 1 & 2 | 14–15 W/(m·K) |
| Thermal conductivity · Ni-Hard 4 | 12.6–15 W/(m·K) |
| Specific heat at 20°C · Ni-Hard 4 | Approx. 500 J/(kg·K) |
| Thermal expansion, 10–95°C · Ni-Hard 1 & 2 | 8–9 × 10⁻⁶/K |
| Thermal expansion, 20–100°C · Ni-Hard 4 | 14.8 × 10⁻⁶/K |
Reference: Nickel Institute · Ni-Hard: Material Data and Applications, Tables 5–7.
Ni-Hard castings contain hard alloy carbides within an alloyed metallic matrix. Carbide type, morphology and distribution, together with the matrix condition, influence abrasion resistance, hardness and resistance to cracking.
Hard carbides resist abrasive cutting and protect the metallic matrix. Their type and volume vary with Ni-Hard grade and alloy composition.
A suitably processed martensitic matrix supports the carbides and provides high hardness. Matrix condition depends on alloy chemistry, section size and thermal history.
Retained austenite may coexist with martensite and carbides. Its amount and stability influence dimensional stability and service behaviour.
Carbide size, continuity and spacing affect wear behaviour. Coarse or continuous carbide networks can increase susceptibility to cracking.
AI-generated microstructure illustrations — not laboratory test images or quantitative phase-identification results.
| Parameter | Importance |
|---|---|
| Carbide Type & Morphology | Influences abrasion resistance and fracture behaviour |
| Carbide Volume Fraction | Affects wear resistance and the matrix–carbide balance |
| Carbide Size & Distribution | Helps assess structural uniformity and crack susceptibility |
| Matrix Condition | Influences hardness and support of the carbide phase |
| Retained Austenite | Affects dimensional stability and service response |
| Casting Soundness | Porosity and microcracks may reduce component reliability |
Our inspection approach evaluates chemical composition, hardness, microstructure, dimensions and casting condition against agreed customer requirements.
Inspection scope and acceptance criteria follow the specified grade, drawing and agreed inspection plan.
Additional non-destructive or performance testing is selected where required and technically suitable.
Verification for Consistent Material Quality
| No. | Inspection / Testing Method | Purpose | Key Details |
|---|---|---|---|
| 01 | Chemical Analysis | Verify alloy composition | Carbon, nickel, chromium and other specified elements. |
| 02 | Hardness Testing | Verify specified hardness | Suitable hardness method, agreed locations and acceptance range. |
| 03 | Microstructural Examination | Evaluate carbide and matrix condition | Carbide morphology, distribution and metallic matrix. |
| 04 | Dimensional Inspection | Verify drawing compliance | Dimensions, tolerances and critical features. |
| 05 | Visual Inspection | Identify visible imperfections | Surface cracks, misruns, fins and general casting condition. |
| 06 | Additional Testing (When Specified) | Assess application-specific requirements | NDT or wear tests only where required and suitable. |
| 07 | Documentation Review | Confirm records and traceability | Inspection results, material identification and customer requirements. |
Representative images of inspection methods
Specified alloy chemistry
Specified hardness range
Carbide and matrix evaluation
Dimensions and tolerances
Surface condition review
Results and traceability
From raw material selection to final inspection, BSCPL aims to deliver casting solutions aligned with customer drawings, agreed material grades and application requirements.
Testing scope depends on the Ni-Hard grade, component geometry, customer specification and suitability of each inspection method.
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Bhanu Special Castings Private Limited makes steel and iron castings in Vijayawada. We began in 1998. We serve mines, crushers, cement plants, power plants and other industries across India. Send us your drawing or sample to discuss the part you need.
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