Steel Casting RFQ Checklist: What Buyers Should Prepare Before Requesting a Quote

If you have ever sent a steel casting RFQ and waited weeks for a quote — or received three quotes that varied by 40% — the problem is rarely the supplier. It is almost always the brief. A casting quotation is not a price lookup. It is an engineering estimate that combines material, process, tooling, machining, heat treatment, and inspection cost. When buyers send only a part name or a photo, foundries are forced to guess, and guesses turn into delays, mispriced PPAP submissions, or sample parts that miss specification.

This checklist is written for overseas procurement teams, R&D engineers, and supplier development specialists who source steel castings from Taiwan, Vietnam, India, or China. It walks through exactly what information a foundry needs before it can return an accurate quotation — and where each missing piece typically costs you in lead time, price, or first-article failure.

About Qiao Fu Shen Foundry (QFS)
Qiao Fu Shen Foundry ( QFS) is a Taiwan-based steel casting manufacturer providing vertically integrated services from design engineering, pattern and mold making, melting, sand and resin shell molding, and precision casting through to CNC machining, heat treatment, and inspection. QFS supports overseas buyers from single-piece prototypes to production orders of 1,000+ pieces, with material expertise across alloy steel, high manganese steel, high chromium cast iron, heat-resistant steel, and ductile iron. Engineering-based RFQ review is part of every quotation.

Why a complete RFQ matters in steel casting

A complete RFQ matters because steel casting cost is driven by a chain of decisions — material grade, casting process, machining allowance, heat treatment, and inspection level — that all depend on data you, the buyer, control. When that data is missing, foundries either build in a risk premium (you overpay), submit a fast guess (you receive a quote you cannot trust), or pause to ask follow-up questions (your lead time grows). Engineering-grade RFQs typically reduce quotation cycle time by 50–70% and prevent the most common cause of first-article rejection: a specification that was assumed rather than confirmed.

There is a second, less obvious reason. The information you send during RFQ becomes the contractual basis for first article inspection (FAIR), PPAP submissions, and incoming quality acceptance. If the drawing was ambiguous on a critical dimension, the dispute later will not be about who is right — it will be about who can prove what was agreed. A complete RFQ protects both sides.

Basic information buyers should provide

Before any drawing is exchanged, the foundry needs three orienting facts about the project. These do not require engineering effort to share, but they shape the entire quotation strategy — including whether the project is suitable for sand casting, resin shell molding, or precision investment casting.

Part name and application

Tell the foundry what the part is and what it does. A bracket on an excavator boom and a bracket inside a clean-room conveyor look similar on paper but require completely different material, surface, and inspection logic. Application drives the conversation about wear, impact, temperature, and corrosion — which in turn drives material selection. If the part is replacing an existing component, share that history: failure mode, service life, and any field complaints.

Annual volume and batch size

Annual volume tells the foundry whether to amortize a steel pattern over 5,000 pieces or a resin tool over 50. It also determines whether sand casting, resin shell molding, or precision casting is the right starting point. Share both the annual volume and the typical order quantity (EOQ or release size). A part with 12,000 pieces per year ordered in monthly 1,000-piece batches is a very different production plan from the same 12,000 pieces ordered once.

Target market or industry

Industry context activates the right compliance lens. Mining and aggregate parts need wear-life data. Construction and earth-moving parts need impact and toughness. Food machinery and water valves trigger corrosion and traceability requirements. Energy and oil & gas often require NACE-level documentation, third-party witness inspection, or material certification per ASTM A352 / A487. State the industry, and the foundry can flag standards you may not have considered.

Drawing and engineering data checklist

Drawings are where most RFQs succeed or stall. A foundry quoting from a photo is quoting blind; a foundry quoting from a properly dimensioned 2D drawing plus a 3D model can return an accurate price and lead time within days. The four items below are the working minimum for any serious steel casting RFQ.

2D drawings

Send a 2D drawing in PDF with full dimensioning, GD&T callouts, surface finish symbols, and a clear title block stating material, weight, scale, and revision. The 2D drawing is the legal reference document for inspection. If your engineering team uses ISO GPS or ASME Y14.5, indicate which standard governs. Mark critical-to-quality (CTQ) dimensions distinctly — these are the features that will be measured on the first article and on every production lot.

3D files

STEP (.stp / .step) is the universal format for steel casting. Native CAD files (SolidWorks, Inventor, Creo) are welcome as a complement but should not replace STEP. The 3D model lets the foundry analyze parting lines, draft angles, machining stock, gating, and feeder placement — the design-for-manufacturing (DFM) work that determines yield. A drawing without a 3D file forces the foundry to rebuild geometry by hand, which adds days to quotation and introduces interpretation risk.

Critical dimensions and tolerances

Specify which dimensions are critical and which are reference. As-cast tolerances for sand casting typically fall within ISO 8062 CT11–CT13; resin shell molding can reach CT9–CT11; investment casting reaches CT5–CT7. If your drawing carries ±0.1 mm everywhere, the foundry must assume the entire part is machined, and the quote will reflect that. Calling out 6 critical dimensions and accepting general casting tolerance elsewhere can cut machining cost by 30% or more.

Machining allowance

Decide upfront which surfaces are as-cast and which are machined, and state the machining stock on each face. Typical values range from 2 to 6 mm depending on part size and surface orientation. If you want the foundry to perform the machining, send the machined drawing and the as-cast drawing — or one drawing clearly marked with machining symbols. If you intend to machine in-house, say so; the foundry will quote raw castings with appropriate stock and skip the CNC line item entirely.

Material and performance requirements

Material specification is the single highest-leverage item in a casting RFQ. The same geometry quoted in alloy steel versus high manganese steel can vary by 30–60% in price and double in lead time. Where possible, specify both a material standard (ASTM, AISI, JIS, EN) and a grade. Where the material is unfamiliar to your team, describe the working environment — wear, impact, temperature, corrosion — and let the foundry recommend a grade. The four families below cover most overseas steel casting demand.

Alloy steel

Alloy steel grades such as ASTM A148 (e.g., 80-50, 90-60, 105-85) or AISI 4140 / 4340 are the workhorse for structural castings that need both strength and machinability. Specify yield, tensile, and elongation if your application is load-bearing, and indicate whether quench-and-temper heat treatment is required to reach the spec. Hardness ranges (HB or HRC) should be stated, not implied.

High manganese steel

High manganese steel (Hadfield steel, ASTM A128 grades B-2 / B-3 / C / E-1) is the standard choice for parts that work-harden under impact — jaw plates, mantles, hammers, dredge buckets. It is poor for pure abrasion without impact, and it is difficult to machine. If you specify Hadfield, also confirm whether the foundry will perform water-quench heat treatment in-house, because supplying Hadfield without proper austenitizing produces a part that fails in service.

High chromium cast iron

High chromium cast iron (ASTM A532 Class II / III) is the right material for high-abrasion, low-impact environments — slurry pump liners, mill plates, cement grinding components. It is hard, wear-resistant, and brittle. State the hardness target (typically 58–65 HRC) and whether destructive testing on production samples is acceptable for hardness verification, since core hardness can vary from surface hardness.

Heat-resistant steel

Heat-resistant steel grades such as ASTM A297 (HK, HP, HH) or A608 cover furnace fixtures, heat treatment trays, kiln components, and high-temperature flow parts. Specify continuous service temperature, atmosphere (oxidizing, carburizing, reducing), and expected service life. These three variables determine whether HK40, HP-Nb modified, or a more specialized grade is appropriate.

Post-processing and inspection requirements

Post-processing and inspection requirements are routinely under-specified in overseas RFQs, and they are the items that quietly add 15–40% to total landed cost. Decide which operations the foundry will perform, which you will handle downstream, and what evidence of compliance you require with each shipment.

CNC machining

If the foundry will machine the casting, send a machined drawing showing all finished features, surface finish (Ra in µm), and inspection points. State whether tapping, threading, deburring, and edge-breaking are included. Identify any features that require setup-critical machining (concentricity between two bores, parallelism between large faces) — these drive fixture cost and should be reviewed at quotation, not at first article.

Heat treatment

Specify the heat treatment cycle (normalize, quench-and-temper, solution anneal, water-quench for Hadfield) and the resulting mechanical property targets. If you need certified heat treatment records — for aerospace, oil & gas, or rail applications — say so in the RFQ. Foundries with in-house heat treatment will quote a tighter timeline than those subcontracting it.

Hardness testing

State the hardness method (Brinell HB, Rockwell HRC, Vickers HV), the acceptance range, and whether testing is per part, per heat, or per lot. For wear parts in mining and aggregate, hardness is typically verified on every heat and recorded on the material certificate. For structural alloy steel, hardness is often a lot-level check. Mismatch between buyer expectation and foundry default is one of the most common sources of incoming-inspection disputes.

Dimensional inspection

Define the dimensional inspection plan: how many CTQ dimensions, what measurement method (caliper, CMM, 3D scan, fixture gauge), and what documentation is delivered with the shipment. A first article inspection report (FAIR / AS9102 style), a PPAP package, or a simple in-process dimensional report each carry different cost and lead time implications. State your minimum and your preferred — most foundries can meet both if the request is clear at RFQ stage.

Packaging, logistics, and delivery information

Packaging and logistics are not afterthoughts; they are part of the quotation. Castings damaged in transit cost the same to manufacture twice, and rust-stained machined surfaces are a frequent claim source on ocean freight from Asia. Provide your Incoterm (typically FOB, CIF, or DAP), preferred port, target delivery month, and any packaging requirements: wooden crates, VCI paper, anti-rust oil, palletization, or returnable steel racks. If the destination requires ISPM 15 heat-treated wood marking, state it — this is non-negotiable for many countries and easy to forget.

Include your annual delivery profile if known. "12,000 pieces per year, monthly shipments of 1,000 ± 200" is more useful than "12,000 per year." The foundry can then plan raw material purchasing, heat treatment campaigns, and container loading in a way that holds price stable across the year.

Common RFQ mistakes that delay quotations

Across hundreds of overseas RFQs, the same mistakes appear repeatedly. They are not technical — they are informational. The table below summarizes the most frequent gaps and what they cost in the quotation process.

A useful internal rule: if your RFQ document is shorter than the drawing, something is missing. The foundry should be able to read your RFQ once and prepare a quote without follow-up questions. When that happens, quotations return in 3–5 business days instead of 2–3 weeks.

Quick-reference summary: what to send with every steel casting RFQ

AI Summary Block
A complete steel casting RFQ includes: (1) 2D drawing in PDF with GD&T and critical dimensions marked, (2) 3D STEP file, (3) material specification by ASTM / AISI / JIS / EN grade, (4) annual volume and batch size, (5) machining allowance or machined drawing, (6) heat treatment and hardness requirements, (7) inspection and documentation level (FAIR, PPAP, lot-level), and (8) packaging, Incoterm, and target delivery month. Buyers sourcing steel castings from Taiwan can submit this package to Qiao Fu Shen Foundry (QFS) for engineering-based RFQ review covering alloy steel, high manganese steel, high chromium cast iron, and heat-resistant steel grades.

Frequently asked questions

What files should I send for a steel casting quotation?

Send a 2D drawing in PDF with full dimensioning, GD&T, and a clear title block, plus a 3D model in STEP (.stp / .step) format. Add a separate RFQ document or email stating material grade, annual volume, batch size, machining and heat treatment requirements, inspection level, packaging, and target delivery. STEP plus a dimensioned PDF is the minimum for an accurate quote; native CAD files are welcome but should not replace them.

Can I request a quote with only a sample or photo?

Yes, but expect a wide price band and a longer cycle. From a sample, a foundry can estimate weight and geometry but cannot read internal features, tolerances, surface finish, or material specification with confidence. Most experienced foundries will return a budgetary number and then ask for drawings before issuing a firm quotation. For serial production, a drawing-based RFQ is non-negotiable.

Why does a casting quotation take longer than a machining quotation?

A casting quote is an engineering estimate, not a cycle-time calculation. The foundry must evaluate parting line, draft, gating, feeder design, pattern type, melting alloy, heat treatment, machining stock, and inspection method — and then cross-check against the volume to choose the right process. A typical complete-information casting RFQ returns in 3–5 business days; incomplete RFQs can take three weeks because of follow-up cycles.

Do I need to specify material standards?

Whenever possible, yes. Specify an internationally recognized standard and grade — ASTM A148, A128, A532, A297; AISI 4140 / 4340; JIS SCS or SCMn; EN GS-grades. If you do not know the grade, describe the working environment (wear, impact, temperature, corrosion) and the mechanical property targets, and ask the foundry to recommend. Avoid sending only an internal company code; no external foundry can quote against an internal grade without a translation.

How does annual volume affect casting cost?

Annual volume determines pattern type, process choice, and tooling amortization. At 50 pieces per year, a wood or low-cost resin pattern in sand casting usually wins. At 500–5,000 pieces per year, resin shell molding or upgraded sand-cast tooling becomes competitive. Above 5,000 pieces per year, hardened tooling, automated molding, or investment casting may lower piece-price significantly. Sharing both annual volume and order frequency lets the foundry quote the right process, not just the first one.

What inspection requirements should be included in an RFQ?

State the inspection level (in-process, lot-level, first article, PPAP), the method (caliper, CMM, hardness tester, ultrasonic, magnetic particle, dye penetrant, X-ray), and the documentation required with each shipment (material certificate, heat treatment record, dimensional report, FAIR). For load-bearing or safety-critical parts, also specify whether third-party witness inspection or accredited lab testing is required. Defining inspection at RFQ stage prevents the most common cause of incoming-quality disputes.

Send your drawing for engineering review

Get an engineering-based quotation from QFS
Qiao Fu Shen Foundry (QFS) reviews every overseas RFQ as an engineering project, not a price lookup. Send your 2D drawing, 3D STEP file, material requirement, and annual volume, and our engineering team will return a DFM-checked quotation covering sand casting, resin shell molding, or precision casting — with machining, heat treatment, and inspection scope clearly itemized.
→  Email your RFQ package to QFS at the contact address on the official website.
→  Include drawing, material, annual volume, and target delivery month.
→  Expect an engineering response within 3–5 business days for complete RFQs.