How to Prepare an RFQ Drawing Package for Custom Mining Wear Castings
How to Prepare an RFQ Drawing Package for Custom Mining Wear Castings
When a chute liner, crusher wear component, mill part or other mining wear casting fails before a planned shutdown, the purchasing task is often described as “get a quote quickly.” A useful quote, however, starts before price comparison. The buyer needs to give every qualified supplier the same engineering basis: the correct drawing revision, the real operating duty, the interfaces that must fit, and the inspection evidence required at delivery.
This guide explains how to prepare an RFQ drawing package for custom mining wear castings. It is written for maintenance engineers, project engineers and procurement teams in mining, aggregates and cement operations. It is not a substitute for equipment design review, site risk assessment, installation instructions or a purchaser-approved drawing. Final material, geometry, thickness, fastening, heat treatment, manufacturing route and acceptance criteria must be confirmed against the approved drawing and actual duty.
Why incomplete RFQs create avoidable technical risk
Wear castings are not interchangeable simply because they have a similar outline or a familiar material name. The parts work inside a system: they protect a chute, guide material flow, support a crushing or conveying interface, or transfer load through bolts, wedges, backing material or other restraints. A quotation based only on an old photograph or a nominal alloy label can omit the revision, mounting detail, local section thickness, mating datum or service condition that controls the result.
Incomplete information also makes supplier quotations difficult to compare. One supplier may assume a cast surface, another machining allowance; one may include a dimensional report and another may not; one may quote a material grade with a particular heat-treatment condition while another assumes a different condition. The apparent lowest price can therefore represent a different scope. A concise, controlled RFQ reduces ambiguity without forcing the purchaser to over-specify a design that has not been reviewed.
Start with the controlled drawing and revision
The primary RFQ document should be the latest released drawing, preferably PDF plus the native 2D or 3D file when the purchaser is permitted to share it. Put the drawing number, revision, issue date and the name of the controlling document in the RFQ cover note. If an old part is being copied because the original drawing is unavailable, say so plainly. Measurements, photographs and a marked-up sketch can then support an engineering review, but they are not equivalent to a released drawing.
| Drawing item | What to provide | Why it matters |
|---|---|---|
| Revision control | Drawing number, revision, date and change note | Prevents a supplier quoting an obsolete hole pattern, thickness or interface. |
| Views and sections | Plan, elevation, critical sections and detail views | Shows wall transitions, wear faces, recesses, ribs and hidden geometry. |
| Datums and critical dimensions | Functional datums, hole locations, mating faces and inspection dimensions | Lets the supplier plan measurement and the buyer define fit. |
| Machining and surfaces | Machined areas, finish requirement and allowance if specified | Separates casting requirements from final-machined requirements. |
| Notes and standards | Material, heat treatment, marking, inspection and acceptance notes | Creates one auditable basis for quotation and manufacture. |
Do not rely on overall length and width alone. For a liner plate, for example, bolt-seat geometry, countersinks, locating features, joint faces and the relationship between the wear face and mounting face can be more important than the outside envelope. A related example is the AS2074 L2A chute liner plate page, where the customer-approved drawing remains the basis for final dimensions and installation details.
Specify tolerances where function requires them
Not every dimension needs an individual tight tolerance. Identify what controls assembly, seal, clearance, bolt alignment, material flow or wear replacement. If the drawing uses general casting tolerances, identify the standard and class actually required. ISO 8062-4:2023 provides rules for geometrical tolerancing of moulded and machined-out cast parts and addresses machining allowances and draft angles. It is a communication framework, not a substitute for deciding the functional tolerance of a particular interface.
Describe the duty, not just the industry
“Mining service” is not a material specification. Abrasion, impact, sliding distance, particle size, moisture, corrosion, temperature, flow velocity and bridging behavior can all change the wear mechanism. The equipment location also matters: a feed chute, transfer point, crusher cavity, discharge skirt and mill feed path can impose very different impact and maintenance constraints.
| Duty input | Useful RFQ detail | How it affects review |
|---|---|---|
| Material handled | Ore, clinker, aggregate or other material; representative particle size and abrasiveness if known | Supports a discussion of abrasion, impact and corrosion mechanisms. |
| Flow and impact | Drop height, direction, flow rate, velocity estimate and known impact zones | Helps distinguish impact loading from sliding wear and identify local reinforcement needs. |
| Environment | Wet/dry condition, temperature, chemicals, dust and corrosion exposure | Identifies environmental limits that may affect material or coating decisions. |
| Operating cycle | Hours, starts/stops, shutdown windows and target replacement interval | Allows maintenance access and replacement planning to be considered. |
| Failure history | Photos, wear maps, cracks, breakage, loose fasteners or deformation | Provides evidence for engineering review instead of guessing from a material name. |
Describe facts and observations, not predicted life. For example: “The outer corner wears through first after approximately X operating hours” is more useful than requesting a supplier guarantee of a particular service life. Actual life depends on equipment geometry, feed characteristics, operating practice, installation, materials and variables outside a casting supplier’s control. Any proposed change should be reviewed by the purchaser’s responsible engineer before installation.
Define the material requirement responsibly
Specify the required grade, recognized standard or purchaser-approved chemistry and mechanical-property requirement when one exists. If the material is still under review, state the service problem and ask the supplier to propose options with their stated limitations. Do not treat a marketing alloy name, a single producer’s data sheet, or a hardness number alone as a universal guarantee of abrasion performance.
For applications where abrasion-resistant white iron is technically appropriate, ASTM A532/A532M covers abrasion-resistant cast irons used in mining, milling, earth-handling and manufacturing applications. Whether that specification, a manganese steel grade, a low-alloy steel or another material system is suitable must be determined from the approved part design and duty. High impact, difficult section transitions, field welding, machining needs, temperature and corrosion can change the decision.
Put material questions in the RFQ
- Is a material grade mandatory, or may equivalent options be proposed?
- What condition is required at delivery: as-cast, heat-treated, machined, painted or otherwise protected?
- Are hardness, chemistry, microstructure, tensile properties or impact values required? State the test method and acceptance limit where known.
- Are repair welding, surface build-up or local machining permitted? If so, who approves the procedure and acceptance criteria?
- Which surfaces must remain machinable or must not be machined?
Hardness is useful only when its test location, preparation, method and acceptance range are clear. ASTM E10 describes the Brinell hardness test method and notes that a result at one location may not represent the entire part. It should therefore be requested as one controlled inspection input, not as a stand-alone prediction of wear life.
Make mounting and equipment boundaries explicit
A component may be correctly cast and still fail at installation if its restraint system is poorly defined. Provide the mating drawing or at least the installation envelope: bolt type and size, bolt-head clearance, threaded or through holes, counterbore/countersink details, wedge or clamp arrangement, backing materials, allowable interference and access direction for tools. State whether fasteners are part of the supply scope. If the existing part has distorted, include measurements of the equipment interface rather than assuming the old component is dimensionally correct.
For chute work, identify flow direction and the intended leading/trailing edge orientation. For crusher or mill components, identify the compatible machine model only if it is confirmed by the buyer; an equipment name alone is not permission to copy proprietary geometry. The chute liner castings page can help frame the component category, but the RFQ must still define the customer-specific interface and approved design.
Request inspection and documentation that match the risk
Inspection should be discussed before a quote is issued, especially where the part has safety, production or fit-up consequences. A realistic scope may include visual examination, dimensional inspection, material traceability, heat number or batch identification, hardness tests, NDT where justified, and packing/marking requirements. The buyer should state the applicable standard, acceptance criteria, sampling plan and report format; otherwise a generic certificate may not demonstrate the requirement that mattered.
| Possible requirement | Define before ordering | Typical evidence |
|---|---|---|
| Dimensional control | Critical dimensions, datums, tolerance and sample quantity | Dimensional report linked to drawing revision. |
| Material traceability | Grade, lot/heat identification and document expectation | Material certificate or agreed test record. |
| Hardness | Method, test areas, preparation and acceptance range | Recorded readings with location identification. |
| NDT | Method, areas, acceptance level and personnel/record needs | Report tied to part and drawing revision. |
| Trial fit | Gauge, mating item, assembly condition and responsibility | Fit-check result or purchaser witness record, if agreed. |
Inspection documents are valuable only when they are traceable to the purchased part and defined acceptance criteria. Review EB Castworld’s quality assurance information as a starting point, then include your project-specific requirements in the RFQ. The purchaser remains responsible for final acceptance and for confirming that inspection scope is appropriate for the equipment duty.
Ask suppliers to separate confirmed scope from alternatives
A technically useful quotation should make assumptions visible. Ask each supplier to distinguish the scope that follows your released drawing from any suggested alternatives. For example, a supplier may propose a different material family, a change to local thickness, a machined rather than cast feature, or a different inspection route. These can be worthwhile subjects for a controlled engineering review, but they must not silently replace the RFQ basis. Keep every alternative on a separate line with its technical reason, drawing impact, inspection impact and any information still needed from the purchaser.
Use a clarification register when more than one party is involved. Record the question, drawing reference, owner, response, decision and revision that closed it. Typical questions include whether a dimension is final-machined or as-cast; whether fasteners are in supply scope; whether hardness is required on a specific wear face; and whether a repair-weld policy applies. A short register is more reliable than informal email assumptions, especially when quotation, design and maintenance teams are in different locations.
Do not award a part merely because its quotation repeats the requested alloy designation. Compare the confirmed drawing revision, material condition, machining scope, inspection records, packing, exclusions and open technical assumptions. This is a scope comparison, not a promise that one supplier or one material will deliver a particular life. The responsible purchaser engineer should approve all changes affecting fit, safety, process duty or equipment warranty.
Give commercial and logistics context without inventing requirements
State quantity for prototype, trial batch and recurring demand separately. Identify the requested delivery location, packing limitations, lifting restrictions, maximum crate dimensions, shipment method if known and the required-on-site date. A requested date is useful planning information; it is not a supplier commitment until confirmed in a quotation or order acknowledgement. If the replacement is for a shutdown, state the shutdown window and the consequence of a late delivery so the supplier can identify items needing early technical release.
RFQ package checklist
Before sending the request, a maintenance or procurement coordinator can use this checklist:
- Latest approved drawing, revision/date and any native model permitted for release.
- Marked critical dimensions, datums, machined areas and mounting features.
- Equipment boundary, mating geometry and installation orientation.
- Material grade or service problem, including any mandatory standards and delivery condition.
- Duty description: handled material, impact/sliding zones, environmental conditions and failure history.
- Quantity split, destination, required-on-site date and packing/handling constraints.
- Inspection, traceability, marking, certificate and NDT requirements with acceptance criteria.
- Named technical and commercial contacts for clarifications.
How EB Castworld can use an RFQ package
EB Castworld can review a customer-provided RFQ package for manufacturability, drawing clarity and quotation scope. The review does not replace the customer’s engineering authority. Final production must follow the purchaser-approved drawing, agreed material and inspection requirements. For an overview of relevant component categories, see wear castings; for manufacturing context, see the factory tour.
When you are ready, use the contact page to send drawings for quotation. Include the revision-controlled drawing and the checklist items above. A complete package gives both sides a better basis to clarify open questions, compare technical scope and prepare a responsible supply proposal.
References and engineering boundary
- ISO 8062-4:2023 — dimensional and geometrical tolerances, machining allowances and draft for castings.
- ASTM A532/A532M — abrasion-resistant cast irons.
- ASTM E10 — Brinell hardness testing of metallic materials.
This article is general procurement and engineering guidance. It does not approve a design, establish a material selection, define safety measures, certify compliance or promise service life. Confirm all critical decisions with the responsible equipment engineer and the approved project documentation.