Wear-Resistant Cast Alloy Chemical Composition Guide: High Chrome, Cr-Mo, Ni-Hard and Manganese Steel
A chemical-composition table is useful only when it identifies the alloy family, material standard, delivery condition and sampling basis. High-chromium white iron, Cr-Mo alloy steel, Ni-Hard and austenitic manganese steel can all appear in wear-liner quotations, but similar element symbols do not make them interchangeable.
This guide compares common wear-resistant cast alloy composition families for chute, hopper, crusher and mill-liner RFQs. The tables are screening tools based on publicly stated EB Castworld manufacturing families and authoritative standard scopes. They are not universal grade limits. The approved drawing, contracted standard and purchase order always control acceptance.
Four alloy families that buyers often confuse
| Alloy family | Composition signature | Primary material strategy | Typical caution |
|---|---|---|---|
| High-chromium white cast iron | High C and Cr; Mo/Cu/Ni may tune the matrix. | Hard chromium-rich carbides supported by a heat-treated matrix. | Impact, edge loading, welding and section sensitivity. |
| Cr-Mo alloy steel casting | Lower C and Cr than high-chrome iron, with controlled Mo. | Alloy-steel matrix strength, hardenability and toughness. | Do not expect the carbide volume of high-chrome white iron. |
| Ni-Hard cast iron | High C with substantial Ni and lower/moderate Cr. | Ni-Cr white-iron system for specified abrasion duties. | Grade identity, section, impact and heat treatment remain critical. |
| Austenitic manganese steel | High Mn with approximately 1% C in common families. | Tough austenitic matrix capable of work hardening under sufficient impact. | Low-impact sliding abrasion may not activate useful work hardening. |
For the metallurgical role of individual elements inside high-chrome iron, read Alloying Elements in High-Chrome Chute Liners. This article instead compares complete material families and quotation tables.
Public EB manufacturing-family composition ranges
The following ranges summarize material-family capabilities publicly listed by the wider EB casting group. They help identify a feasible RFQ direction; they are not one grade and must not be copied as an acceptance specification without technical review.
| Family | C wt.% | Mn wt.% | Cr wt.% | Mo wt.% | Ni wt.% | Important note |
|---|---|---|---|---|---|---|
| High-Cr white iron capability family | 2.40–3.20 | 0.50–1.00 | 12.00–30.00 | 0.10–3.00 | 0–0.30 | Broad capability envelope covering multiple grades and purposes. |
| High-Cr alloy family | 1.10–2.20 | 0.50–1.00 | 11.00–30.00 | 0.10–3.00 | 0–0.30 | Requires exact cast-iron/steel identity and specification in the RFQ. |
| High-Mn steel capability family | 0.90–1.30 | 11.00–18.00 | 1.50–2.50 | ≤1.00 | Not listed | Broad modified-manganese family, not a single ASTM grade. |
| Ni-Hard capability family | 2.40–3.60 | ≤2.00 | 1.50–10.00 | ≤0.10 | 3.30–10.00 | Very broad Ni-Hard envelope; order by exact grade/specification. |
Use rule: these are supplier capability-screening ranges, not guaranteed values for every product. A quotation must narrow them to an approved grade, chemistry range, sampling method and delivery condition.
Cr-Mo alloy steel screening ranges
Cr-Mo alloy steel is often confused with Mo-alloyed high-chrome white iron because both contain Cr and Mo. The carbon/chromium levels and intended microstructure are fundamentally different.
| EB public family label | C wt.% | Cr wt.% | Mo wt.% | Mn wt.% | Interpretation |
|---|---|---|---|---|---|
| Cr-Mo Alloy Steel I | 0.30–0.50 | 1.70–2.50 | ≤0.50 | 0.40–1.20 | Lower-carbon alloy-steel family for drawing-based castings. |
| Cr-Mo Alloy Steel II | 0.65–0.90 | 1.50–2.50 | ≤0.50 | 0.50–1.20 | Higher-carbon alloy-steel family; heat treatment and toughness require review. |
| Cr-Mo Alloy Steel III | 0.40–0.90 | 4.00–7.00 | ≤0.50 | 0.60–1.00 | Higher-chromium steel family, still distinct from high-C white iron. |
Historical AS 2074 grade references are sometimes found in mill-liner drawings, but Standards Australia’s AS 2074-1982 page marks that edition superseded, and later versions may also be withdrawn. Never claim current compliance from an old grade name alone; confirm the customer-required edition and project specification.
High-chrome white iron composition logic
High-chrome white iron uses carbon and chromium to establish a hard carbide-bearing structure. Mo, Cu, Ni and Mn may modify hardenability and matrix transformation. A composition within a broad range can still produce different results when section size, solidification rate and heat treatment change.
ASTM A532/A532M covers abrasion-resistant cast irons and organizes chemistry and hardness by class/type. The current purchase order must state the edition and exact designation. The Cr-Mo High-Chrome White Iron Chute Liner Plates page describes the drawing-based product boundary.
Ni-Hard chemical composition logic
Ni-Hard is a family of nickel-chromium white cast irons. Nickel supports matrix hardenability and austenite stability while chromium contributes to carbide control. Different Ni-Hard grades and modifications can have substantially different Ni/Cr balance, graphite/carbide condition and service suitability.
Do not purchase “Ni-Hard” without a grade, condition and hardness requirement. A wide supplier capability range is useful for feasibility but too broad for inspection. Compare the intended grade against the contracted standard or OEM drawing.
Austenitic manganese steel composition logic
Hadfield-type manganese steel uses a high-Mn austenitic matrix and appropriate carbon, followed by suitable heat treatment to develop toughness and ductility. ASTM A128/A128M covers Hadfield austenitic manganese steel castings and alloy modifications. It is a steel-casting specification, not a white-iron specification.
High manganese content does not guarantee wear life in a chute. The surface generally needs sufficient impact or deformation to work harden. For quiet sliding abrasion, a high-chrome or other wear family may be more suitable, subject to support and impact review.
Element-by-element comparison across families
| Element | High-Cr white iron | Cr-Mo steel | Ni-Hard | High-Mn steel |
|---|---|---|---|---|
| C | Major carbide-volume and matrix-balance control. | Strength/hardness and heat-treatment response. | White-iron carbide system. | Austenite stability and work-hardening response. |
| Cr | Chromium-rich carbide formation and hardenability. | Hardenability and alloy-steel matrix properties. | Carbide control with nickel-bearing matrix. | Often a modification, not the principal element. |
| Mo | Hardenability/matrix control and possible additional carbides. | Hardenability and tempering response. | May be limited or grade-specific. | Optional modification in some grades. |
| Ni | Optional matrix/austenite stabilization. | Optional alloying addition. | Defining matrix-alloying element. | Not normally the defining element. |
| Mn | Supporting melt/matrix role at modest levels. | Deoxidation and hardenability support. | Supporting role. | Defining high-level alloy element. |
Why the same element has different effects
An element partitions differently depending on the rest of the composition and phases present. Chromium may reside partly in M7C3-type carbides in high-chrome iron, while lower Cr in alloy steel mainly supports matrix hardenability and tempering behaviour. Nickel is a defining matrix element in Ni-Hard but a minor optional addition in some high-chrome grades.
That is why a spectrometer result should first be matched to the correct alloy family. Comparing only one column—such as Cr percentage—can make a sound alloy look wrong or an incorrect substitution look acceptable.
Composition is not microstructure
| Data item | What it tells you | Missing information |
|---|---|---|
| Chemical analysis | Elements present in the represented sample. | Carbide size, matrix phases, defects and residual stress. |
| Bulk hardness | Indentation response at stated locations. | Exact chemistry, toughness and wear mechanism fit. |
| Heat-treatment record | Recorded thermal processing for a production lot. | Local structure unless sampling supports it. |
| Metallography | Prepared microstructure at a particular sample/location. | Whole-casting uniformity without a representative plan. |
| Field wear map | Actual loss pattern under site duty. | Cause unless trajectory, fixing and operating data are included. |
How heat treatment changes the meaning of a composition
High-chrome white iron may be supplied in as-cast, hardened, stress-relieved or other specified conditions. Cr-Mo steel relies on a suitable normalize/quench/temper route for the chosen grade and section. Austenitic manganese steel requires solution treatment appropriate to the grade. Ni-Hard requirements vary by type and application.
A chemistry table without delivery condition is incomplete. Require lot-linked heat-treatment records and define hardness or mechanical-property sampling where appropriate. Never infer heat treatment from the material name alone.
Standards map for procurement
| Standard/reference | Material scope | Use in an RFQ | Caution |
|---|---|---|---|
| ASTM A532/A532M | Abrasion-resistant alloyed white cast irons. | State edition, class/type, condition and ordered tests. | Does not cover every proprietary cast wear alloy. |
| ASTM A128/A128M | Hadfield austenitic manganese steel and modifications. | State active edition/grade and heat-treatment requirements. | Not interchangeable with high-chrome white iron. |
| ASTM A834 | Common requirements used with listed iron-casting specifications. | Invoke only where applicable and specify supplementary requirements. | Individual product specification takes precedence. |
| ASTM A781/A781M | Common requirements for steel/alloy castings used with listed product standards. | Coordinate with the applicable steel-casting specification. | It is not a standalone wear grade. |
| AS 2074 legacy references | Carbon, low- and high-alloy steel castings in historical drawings. | Confirm exact edition and customer acceptance. | Do not present superseded/withdrawn editions as current. |
Chemical analysis methods and sample identity
ASTM E351 provides referee chemical-analysis methods for cast irons across defined composition ranges. Production laboratories may use optical emission spectroscopy or other validated methods according to their quality system and contract. The method, calibration and sample condition affect reported results.
| Sampling question | Why it matters | RFQ wording |
|---|---|---|
| Heat or product sample? | Represents melt chemistry or a location in the finished casting. | State required sample basis and frequency. |
| Which part/lot? | Prevents certificates being detached from supplied castings. | Require heat/batch link in marking and documents. |
| Which elements? | Different grades control different majors, minors and residuals. | List all reportable/acceptance elements. |
| Which method? | Composition range and method capability must match. | State applicable test standard or approved laboratory method. |
| Rounding and uncertainty? | Borderline results need a defined decision rule. | Agree specification interpretation and referee procedure. |
Major, minor and residual elements
Major elements define the family: Cr/C in high-chrome iron, Ni/Cr in Ni-Hard, or Mn/C in Hadfield steel. Minor additions such as Mo, Cu, Ni, V, Nb, Ti or B can tune hardenability, carbides or refinement. Residuals and impurities such as P and S are controlled to protect casting quality.
The distinction is functional, not merely percentage-based. A small boron addition can matter greatly, while several percent of a major element may be normal. Require the elements relevant to the grade rather than a generic “full chemistry” with no acceptance logic.
Material-family selection by wear duty
| Dominant duty | Family to evaluate | Evidence required before selection |
|---|---|---|
| Stable severe sliding abrasion | High-Cr white iron or Ni-Hard grade. | Abrasive, impact, support, section, heat treatment and previous wear. |
| Impact plus deformation | Austenitic manganese steel or tough alloy steel. | Impact energy, work-hardening evidence, geometry and support. |
| Heavy section requiring steel toughness | Cr-Mo alloy steel. | Strength/toughness target, section, heat treatment and NDT. |
| Abrasion with position-specific steel support | Bimetallic high-chrome/steel construction. | Interface route, load path and qualification evidence. |
| Fabricated field-fit liner | NM wear plate or other wrought material. | Forming, welding, hardness, impact and installation. |
See the Chute Liner Material Grades Selection Guide and Bimetallic High-Chrome Cast Chute Liner Plates for adjacent decisions.
How to compare two supplier composition tables
- Confirm both quotations describe the same alloy family and standard edition.
- Separate nominal values, supplier capability ranges and contractual acceptance limits.
- Compare carbon and principal alloy balance, not only the largest chromium number.
- Check minor additions and limits on phosphorus, sulfur and relevant residuals.
- Compare heat-treatment condition, hardness/mechanical requirements and section.
- Check sample basis, test method, traceability and certificate deliverables.
- Compare casting geometry, fixing, inspection and total installed scope.
Example of a controlled RFQ material clause
A useful clause might state: “Material shall conform to [standard, edition, class/type] or customer-approved equivalent. Supplier shall propose actual chemistry ranges, heat-treatment condition and hardness locations for approval. Each shipment shall include heat/batch-linked chemistry, heat-treatment and dimensional records. No substitution between white iron, Cr-Mo steel, Ni-Hard or manganese steel is permitted without written approval.”
This structure controls the outcome without inventing an unvalidated recipe. Add application-specific metallography, NDT, mechanical testing or first-article requirements only when they have a defined method and acceptance criterion.
Do not confuse a composition range, melt aim and test tolerance
A material specification normally provides contractual minimum and maximum values. The foundry’s internal melt aim is usually narrower and may be shifted within that window to account for furnace practice, alloy recovery, section and the intended heat-treatment response. The melt aim is a production-control value; it does not silently replace the purchase specification.
Measurement uncertainty and rounding are separate again. A reported result at a limit should be evaluated under the contracted test method and agreed decision rule. Buyers should not add an unofficial “plus tolerance” after receiving a nonconforming result, and suppliers should not reject a compliant value merely because it differs from their internal target.
| Number in the document | Purpose | Who controls it | Correct use |
|---|---|---|---|
| Specification range | Defines contractual chemical acceptance. | Applicable standard and approved purchase order. | Compare reported results using the stated method and rules. |
| Nominal composition | Describes a typical centre or family identity. | Grade description or supplier proposal. | Use for communication, not as an unstated tolerance. |
| Foundry melt aim | Guides charge calculation and process control. | Foundry manufacturing plan. | Keep within the approved grade and manage normal process variation. |
| Laboratory result | Reports the represented sample under a test method. | Qualified laboratory and sampling plan. | Link to heat/batch identity and evaluate against contract limits. |
| Measurement uncertainty | Describes confidence around the analytical result. | Laboratory quality system/referee procedure. | Apply only through an agreed conformity decision rule. |
If tight limits are requested outside a recognized grade, confirm that raw-material variation, analytical capability and recovery make them practical before quotation. Unnecessarily narrow chemistry can increase melt adjustments and rejection risk without improving field performance. Where a performance objective drives the restriction, state that objective and pair chemistry with the appropriate heat-treatment, hardness, microstructure or mechanical evidence.
Common composition-table mistakes
- Comparing chromium percentages across cast iron and cast steel as if they have the same role.
- Treating a supplier capability envelope as one guaranteed alloy grade.
- Calling every nickel-bearing white iron “Ni-Hard” without a grade.
- Calling every Cr-Mo alloy “high-chrome” without checking carbon and microstructure.
- Using an obsolete drawing standard without confirming edition and project acceptance.
- Accepting chemistry without heat-treatment condition and lot traceability.
- Assuming hardness proves composition, toughness or service life.
- Copying laboratory or competitor chemistry without reviewing section and casting route.
RFQ composition and QA checklist
| RFQ section | Required information | Result |
|---|---|---|
| Material identity | Family, standard, edition, grade/class/type and approved equivalents. | Prevents cross-family substitution. |
| Chemistry | Major/minor/residual limits, nominal versus acceptance status. | Creates a measurable composition requirement. |
| Sampling/testing | Heat/product sample, frequency, method and referee procedure. | Defines what the certificate represents. |
| Condition | Heat treatment, hardness or mechanical requirements and locations. | Connects chemistry to delivered properties. |
| Drawing/service | Section, fixing, impact, abrasive, temperature and wear history. | Supports material-family suitability. |
| Documents | Traceability, chemistry, heat-treatment, inspection and packing records. | Supports release and future failure analysis. |
Use the Chute Liner Inspection Checklist Before Shipment to complete dimensional, marking and packing requirements.
Decision summary
High-chrome white iron, Cr-Mo steel, Ni-Hard and manganese steel are different metallurgical systems. Their composition tables should be read as coordinated balances of carbon, principal alloying elements, heat treatment and microstructure—not as rankings based on the largest alloy percentage.
Start with wear duty and material family, then choose an applicable standard or approved supplier grade. Convert broad capability ranges into specific contractual limits, sampling and records before production.
Send a wear-resistant cast alloy RFQ
Send the drawing, service data, previous material certificate and required alloy standard, or email wear@ebcastings.com. EB China will review the material family, casting route and inspection package before quotation.
Engineering boundary: the tables are educational and capability-screening information, not guaranteed grade limits. The approved purchase specification governs chemistry. Final material, geometry, support, fixing, heat treatment and installation require customer and qualified-engineer approval; composition cannot guarantee service life.
Technical and image references
- ASTM A532/A532M-10(2023): Abrasion-Resistant Cast Irons.
- ASTM A128/A128M: Austenitic Manganese Steel Castings; verify the active contracted edition.
- ASTM A834-24: Common Requirements for Iron Castings for General Industrial Use.
- ASTM A781/A781M: Common Requirements for Steel and Alloy Castings; verify the active edition.
- ASTM E351: Chemical Analysis of Cast Iron—All Types.
- Standards Australia: AS 2074-1982 status page — superseded historical reference.
- Doroszuk, Król and Wajs (2021), Energies 14(13), 4008 — featured-image source, Figure 15, CC BY 4.0.