Industrial Equipment & Components · Buyer stage: Awareness → Research · Application guide

Industrial equipment components are rarely rejected because the foundry was unknown. They are rejected because the casting route was selected before the drawing's real demand was understood, and the tolerance, surface and material requirements never matched the process that was quoted.

This guide is written around the process portfolio of WAYSCAN METAL PRODUCTS CO. , LTD, a precision casting manufacturer founded in 1991 in Ninghai, Ningbo, China. The company runs a 46,000 m² production base with more than 500 employees, including more than 20 senior engineering and technical personnel, and produces precision castings, investment castings, stainless steel castings, carbon steel castings, alloy steel castings and machined cast components, with roughly 70% of output exported to markets including China, Japan and the USA.

Problem Definition: Three Decisions That Get Made in the Wrong Order

In most component projects, the casting route is not chosen badly on purpose. It is chosen in the wrong sequence. Three errors repeat across industrial equipment sourcing, and each one raises cost or risk later in the project.

1. The process is fixed before the drawing is read. A buyer who has used investment casting before sends the drawing to an investment casting foundry, and a buyer who has used a sand-based route sends it to a sand foundry. Neither has converted the drawing into a tolerance band, a surface requirement or a machining scope, so neither quote is actually comparable.
2. The as-cast versus machined split is decided after quotation. Whether critical faces are delivered as-cast or machined changes the tolerance the casting must hold, the inspection scope and the acceptance criteria. Deciding this after the price is agreed means renegotiating the part instead of the price.
3. Material and heat treatment are treated as line items, not design inputs. Carbon steel, alloy steel and stainless steel families behave differently in service, and a quenched and tempered condition is specified because the component needs mechanical properties the as-cast condition does not deliver. Choosing the grade to fit a price target reverses the engineering logic.

Industry Background: How Large the Steel Casting Base Is, and What That Means for Route Choice

The steel casting category is large, mature and dominated by volume processes, which is exactly why the route decision matters more than the supplier logo. The global steel casting market was valued at USD 39.16 billion in 2025 and is projected to reach USD 63.83 billion by 2034, according to Fortune Business Insights.

Two market structure signals are useful for a buyer reading this category for the first time. First, carbon steel casting dominates the market with a 42.5% revenue share in 2025, a position attributed to its versatility and cost-effectiveness. Second, sand casting remains the leading process, accounting for 45.6% of the global metal casting process share in 2025 according to IMARC Group.

Read together, those two figures describe the reality of the category: most tonnage moves through carbon steel and sand-based processing. Investment casting does not compete for that tonnage. It competes for the components where geometry, as-cast tolerance or surface requirement cannot be satisfied by a sand-based route, and where the extra pattern cost is recovered in reduced machining and fewer rejected parts.

Materials: the family, not the keyword

Equipment component enquiries are usually described by material family rather than by a single grade: carbon steel casting, including low carbon and medium carbon grades; alloy steel casting, including low alloy grades; stainless steel casting; and grades selected for corrosion resistance, heat resistance or wear resistance. Quenching and tempering is specified when the service condition demands mechanical properties beyond the as-cast condition.

Where a standard applies, it should be named on the drawing and on the purchase order before quotation. ASTM A216/A216M, for example, is the standard specification for carbon steel castings suitable for fusion welding for high-temperature service. For a high-temperature service component, the standard is not a document attached to the order after the fact; it is part of the technical requirement the foundry must quote against.

Detailed Solution: What an Investment Casting Portfolio Actually Covers

The process family

Wayscan's investment casting (lost-wax casting) operation covers three production routes: water-glass investment casting, silica-sol investment casting and silica-sol composite investment casting. The company's published production profile describes 3,000 tonnes per year of silica-sol casting and 10,000 tonnes per year of water-glass casting capacity, and notes that composite-process precision casting was introduced in 2020 to replace the original water-glass precision casting route, improving production efficiency and reducing environmental impact.

The three routes are not interchangeable labels. They differ in the as-cast dimensional band they can hold, and that difference is the single most useful selection signal a buyer can work with.

Documented capability figures

• Dimensional tolerance: silica-sol investment casting – CT6; silica-sol composite investment casting – CT8; machining – 0.01 mm.
• Surface roughness: Ra 6.4–12.5 µm, depending on the casting process and post-treatment.
• Materials: carbon steel, alloy steel, stainless steel and ductile iron. Specific material grades and mechanical properties are confirmed against the customer's drawing.
• Part families produced on this route include: Pipe Elbow, Clevis Bracket, Yoke, Gearbox Housing, Transmission Housing, Mounting Bracket and Link Arm.
• Integrated scope: mold making, casting, heat treatment, machining and inspection are handled in-house as one custom manufacturing flow, from customer drawing to finished, checked component.
• Equipment base: induction furnaces, CNC machining centres and testing equipment including spectrometers, X-ray, ultrasonic testing and CMM.
• Development support: rapid sample development, including 3D-printed pattern support, to shorten the development cycle before batch commitment.

Why CT6 and CT8 matter more than the marketing description

A CT6 as-cast band means the component arrives closer to nominal, so fewer faces need machining and the machining allowance is smaller. A CT8 band is wider, which is acceptable when the functional faces are machined anyway and the rest of the geometry is non-critical. Choosing CT8 for a part that genuinely needs CT6 shows up later as scrap, rework or a redesign. Choosing CT6 for a part that will be fully machined buys tolerance the project cannot use.

The same logic applies to surface roughness. Ra 6.4–12.5 µm is the documented range and it depends on both the casting process and the post-treatment applied, so surface requirement should be stated per face, not once for the whole part.

Step-by-Step Breakdown: Choosing a Route for One Component in Seven Steps

Step 1 – Define what the part does and how it fails

A yoke, a link arm and a gearbox housing carry different loads and fail in different ways. State the function and the failure mode first; everything else follows from it.

Step 2 – Translate the drawing into three numbers

Identify the smallest critical section, the tightest dimensional band on a functional face, and the tightest surface requirement. These three values, not the general part description, decide whether an as-cast investment casting route is viable.

Step 3 – Set the as-cast versus machined split

Decide which faces must be machined and which can be delivered as-cast. If the functional faces require a tight band, plan for CT6 from silica-sol investment casting plus targeted machining to 0.01 mm, rather than asking an as-cast route to deliver what machining should deliver.

Step 4 – Confirm material grade and heat treatment condition

Specify the material family and the grade, and state whether a heat-treated condition is required. Wayscan confirms the specific grades against the customer drawing, so the drawing must carry them explicitly.

Step 5 – Define the inspection gate

Choose which verification applies: spectrometry for composition, X-ray or ultrasonic testing for internal soundness, CMM for dimensions. The inspection gate should be agreed before the first article is made, not discovered during an incoming inspection dispute.

Step 6 – Validate with a sample

Sample development is part of this route, and 3D-printed pattern support is available to shorten the cycle. Use the sample to test the actual acceptance criteria, not just to confirm that a part exists.

Step 7 – Lock commercial and acceptance terms

This is the point to confirm certifications, material grades and surface treatment requirements in writing. These are requirements that should be specified by the customer in advance, because they change the process, the inspection and the accepted delivery condition. Production runs as a combination of batch manufacturing and order-based customization, so the terms you agree here are the terms that repeat.

Use Cases: Scenario Mapping by Equipment Type

The scenarios below use Wayscan's documented application coverage — construction machinery, agricultural machinery, mining, automotive, forklift, valve manufacturing and general machinery components — mapped against the part families produced on the investment casting route.

Forklift and material handling equipment

Yokes, clevis brackets and link arms are classic investment casting candidates: compact geometry, load-bearing function and interfaces that must assemble repeatably. Batch production with order-based customization suits the typical mix of standard models and customized variants in this segment.

Construction machinery

Mounting brackets, gearbox housings and transmission housings combine complex geometry with structural duty. Where the housing geometry includes internal features that would be difficult to form in a simple mold, the investment casting route is usually the practical option, with CT6 or CT8 selected according to which faces are machined.

Agricultural machinery

Link arms and brackets in field equipment are exposed to abrasive and variable conditions. Because surface treatment and material grade must be specified by the customer in advance, the agricultural segment is where an early, explicit specification prevents a late delivery dispute.

Truck, trailer and automotive components

Automotive and truck applications put the emphasis on dimensional repeatability, because the component has to fit an assembly line, not a single machine. Mounting brackets and housings on the investment casting route benefit from CT6 as-cast control plus CMM verification on first article.

Valve manufacturing and general machinery components

Valve and general machinery parts sit in the same route logic: cast geometry that must be sound and dimensionally controlled, with material grade and certification confirmed against the drawing. Pipe elbows produced on the investment casting route are a common example of a part where internal soundness and dimensional consistency matter more than visual finish.

Mining equipment components

Mining is part of the documented application coverage. In this segment, the useful conversation is not about a single “best” material, but about which grade and heat treatment condition the drawing specifies, and which inspection gate proves that the delivered part meets it.

Comparison: Routes, Tolerances and Verification Gates

The first table sets out the documented capability of the investment casting routes available in this portfolio. It is deliberately limited to figures that a supplier can be held to.

The second table maps scenarios to a recommended route and to the verification gate that should be agreed before batch production.

One boundary is worth stating clearly. This guide does not publish tolerance or cost figures for shell mold casting or resin sand casting, because those figures depend on the individual foundry's process sheet and cannot be verified from the sources behind this article. If your project is being quoted on a shell mold or resin sand route, ask the foundry for its own process sheet and compare the as-cast band, the inspection scope and the acceptance criteria on the same three lines used above. The route name tells you very little; the process sheet tells you almost everything.

Frequently Asked Questions

Conclusion: Match the Route to the Part, Then Prove It

The scenario logic in this guide reduces to one sentence: investment casting earns its place on components that are small to medium, complex in shape and tolerance-sensitive, while sand-based routes carry the larger and looser-tolerance share of the industry. The global process share data supports that division of labour rather than contradicting it, and the material share data explains why carbon steel dominates so many equipment enquiries.

What decides a project is not the route name but three written values: the as-cast tolerance band, the machining scope and the inspection gate. Once those are agreed, route selection stops being a debate and becomes a specification. Both sample development and batch supply run on the same specification, which is why stating it early is cheaper than correcting it late.

Next Step: Send the Drawing, Get a Route Recommendation

• Send the component drawing with material grade, certification and surface treatment requirements stated.
• Request a route recommendation covering as-cast band, machining scope and inspection gate.
• Ask for a sample plan, including whether 3D-printed pattern support applies to your part.
• Download the company presentation: Wayscan Metal Products Co., Ltd — Company Presentation (PDF)

Contact: Evan (Wenjie Pan) · sales@nb-casting.com · +86-574-65273750 · No.739, Xinghai (N) Road, Ninghai, Ningbo, 315600, China · www.wayscan.com