News - Factory Audit Guide (Online / On-Site): How to Evaluate the Real Strength of a Foundry?

For global buyers and crusher wear parts distributors serving the mining, aggregate, construction demolition and recycling industries, choosing a foundry with real delivery capability is far more important than comparing unit prices.

The service life and on-site safety of high manganese steel and high chromium cast iron wear parts — including jaw crusher jaw plates, cone crusher concave and mantle liners, and impact crusher blow bars — depend directly on melting composition control, water toughening process, and dimensional accuracy.

From the perspective of international buyer supplier audits, this article systematically outlines key dimensions and checklists for evaluating a foundry’s overall strength during online document pre-screening and on-site or virtual inspections.

Why Wear Parts Casting Buyers Must Conduct Foundry Audits

Crusher wear parts are consumables used under high-impact, high-abrasion conditions.

If a foundry fails to control alloy ratios during melting, fails to meet temperature or cooling rate requirements for water toughening (solution quenching), or skips per-heat spectral analysis, high manganese steel castings will fail to form a work-hardened layer, leading to premature wear — or even breakage during operation that endangers personnel.

Sample parts and brochures alone cannot prove consistent batch quality. Only through structured factory audits — verifying equipment, process records, and quality system implementation — can buyers effectively avoid mass returns and end-user claims.

Online Pre-Audit: Document & Qualification Screening

Before arranging on-site visits or third-party inspections (SGS, BV, TÜV, etc.), require the foundry to submit the following documents for preliminary review:

ISO 9001 certificate and latest surveillance audit record, confirming scope covers manufacturing of austenitic manganese steel castings, high chromium cast iron castings, or alloy steel castings.
Material standard declaration, such as ASTM A128/A128M (high manganese steel), ASTM A532/A532M (high chromium wear-resistant cast iron), EN 10349, DIN or equivalent national standards, plus sample Material Test Reports (MTR) from recent batches.
Sample heat treatment process documents and water toughening temperature curve records, with traceable heat batch numbers.
Typical customer references (sensitive data redacted) from the past year, plus export customs records or packing lists to verify international trade experience.
Complete equipment list, including melting furnace model and tonnage, molding line type (resin sand, sodium silicate sand, lost foam, etc.), heat treatment furnace specifications, and main testing instruments.

If a foundry cannot provide these basic documents or refuses third-party audits, proceed with extreme caution.

Four Core Audit Dimensions for On-Site / Virtual Factory Audits

1. Melting & Molding Workshop – The Source of Material Stability

Verify that melting equipment is medium-frequency induction furnaces or higher; check nameplate tonnage and quantity. Confirm a direct reading optical emission spectrometer (OES) is fully operational at the furnace station, and request random access to chemical composition records for every heat over the past three months.

Top foundries conduct rapid on-furnace spectral testing for every ladle and adjust compositions to meet standards before pouring.

For molding, resin sand molding is preferred for large- and medium-sized crusher liners to ensure high dimensional accuracy and surface quality. Check if the sand processing system has sand reclamation capability and regular compactness test records.

Confirm the maximum and minimum single casting weight range (e.g., 50kg to 5000kg) matches your product requirements.

2. Heat Treatment Workshop – Make or Break for High Manganese Steel Castings

Hadfield steel wear parts require standardized water toughening: heating to 1050°C–1100°C followed by rapid water quenching to fully dissolve carbides into austenite.

During audit, confirm:

Heat treatment furnaces are equipped with automatic temperature control recording systems capable of generating Temperature Uniformity Survey (TUS) reports, with effective working zone tolerance within ±5°C.
Quench tanks have sufficient volume with forced circulation or spraying systems to ensure critical cooling rates and prevent intergranular carbide precipitation and brittleness.
Random recent heat treatment curves match process card requirements for holding temperature, holding time, and water-quench time intervals.

For high chromium cast iron parts, verify temperature control of annealing, quenching, and tempering furnaces and filed hardness test records.

3. Quality Control Laboratory & Traceability – Proving Genuine Quality Control

Inspect the physical and chemical laboratory to confirm the following equipment is available and in use:

Direct reading spectrometer (with carbon-sulfur analyzer)
Brinell / Rockwell hardness tester
Universal material testing machine (with tensile test bars poured per heat)
Charpy impact tester (especially for low-temperature toughness requirements)
Magnetic Particle Inspection (MPI) or Ultrasonic Testing (UT) equipment for internal defects in large parts

Request to review:

Raw tensile and impact test data for test bars of the same material over the past 3–6 months.
Rejected material isolation area and disposal records (rework / scrap) to ensure non-conforming parts are not mixed into shipments.
Full-loop heat number traceability: from raw material incoming labels, melting records, heat treatment batch numbers, to final inspection reports, enabling full reverse traceability for every finished part.

4. Site Management & Delivery Capacity

Check whether molds are numbered and organized, finished goods are sorted and stored with rust and collision protection, and production scheduling is visually managed.

Ask about actual monthly capacity, current capacity utilization, and committed lead times during peak seasons (sand-cast wear parts typically require 15–30 days depending on process).

An internal scrap rate of 3%–5% is considered industry-competitive; unrealistically low rates without evidence should be viewed skeptically.

Virtual Factory Audit Best Practices

If an on-site visit is not possible, require the supplier’s engineer to conduct a real-time video tour of the four key areas without pauses or pre-recorded clips. Focus on verifying:

Live spectrometer screen showing recent test data in the melting shop.
Digital heat treatment curve screenshots labeled with corresponding batch numbers.
Valid calibration labels and original recent test reports for laboratory equipment.
Spontaneous questions to frontline operators or QC staff on critical parameters (e.g., maximum allowed interval before water quenching for high manganese steel) to confirm training effectiveness.

Red Flags During Factory Audits

Refusal to provide batch-specific MTRs, offering only “typical values” instead.
Spectrometer covered in dust with no recent usage logs, or test results with unnaturally uniform values.
No independent heat treatment records or inability to explain water toughening parameters.
Claims of full material capability but only small cupolas or low-tonnage furnaces on site.
Unmarked, randomly stacked finished goods and unnumbered molds.

Conclusion

Evaluating the real strength of a foundry producing crusher wear castings — including high manganese jaw plates, cone liners, high chromium blow bars, etc. — depends on verifying four core capabilities:

melting composition control, water toughening / heat treatment execution, physical testing equipment usage, and full-process traceability.

Combining online document pre-screening with on-site or virtual audits effectively filters out low-price, weak-quality foundries, securing supply chain stability and end-customer satisfaction for your business.

Post time: Jul-02-2026