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Analysis of Cost Composition and Quotation for Industrial Sheet Metal Fabrication

Release time:

2026-07-13

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Abstract

In the industrial sheet metal fabrication industry, the accuracy of quotations directly determines the success or failure of orders and the manufacturer’s profitability. Sheet metal fabrication is a typical… Non-standard customization Production costs are relatively complex, typically comprising six major components: materials, process machining, auxiliary materials, surface treatment, packaging and transportation, and the enterprise’s profit.

Below is an in-depth analysis of the cost structure and standard pricing calculation logic for industrial-grade sheet metal fabrication:

I. The Six Major Cost Components of Sheet Metal Fabrication

1. Material Cost

This is the most basic fixed cost. When calculating it, you must account not only for the net weight but also for the edge‑trimming scrap generated during material layout and cutting (i.e., the waste rate).

Calculation formula ： $\text{材料成本} = \text{零件展开面积} \times \text{板材厚度} \times \text{材料密度} \times (1 + \text{材料损耗率}) \times \text{材料吨价}$

Industry practice : The loss rate for standard rectangular components is approximately 5%–10% ; The scrap rate for irregularly shaped or circular parts may be as high as 20%–30% 。

2. Processing Fee

This is the core output value of the sheet metal fabrication plant, typically calculated based on… Equipment man-hours or Machining operation Billing:

Laser cutting/CNC punching : Usually expressed as the total length of the slits (in meters) or Cutting time (in minutes) is billed. The thicker the sheet metal and the more holes it contains, the higher the rate.

CNC bending : The industry commonly adopts “ Charge by the knife (For standard bends, the rate is 1–2 yuan per tool; for special reverse bends or multi‑step dead edges, the rate is doubled.)

Welding and Grinding : It is a labor-intensive process, typically performed according to Number of solder joints 、 Weld length (cm) or workers’ Labor cost Let’s do the calculation.

3. Surface Treatment Fee

The costs associated with corrosion protection and surface finishing of the enclosure are typically accounted for by the contracted external vendor or by the in-house painting line.

Electrostatic powder coating : Pricing is typically based on surface area (in square meters). Note that sheet metal parts usually require double-sided coating, so the calculated area should be multiplied by 2.

Galvanizing / Anodizing / Electrophoresis : Heavy industrial components (such as hot-dip galvanized parts) are typically priced according to Weight (tons/kilograms) Billing; precision small parts are billed according to Number of pendants Or area-based billing.

4. Hardware & Accessories

Fastener : Commonly used in cabinets are rivet nuts, rivet studs, expansion rivets, and blind rivets, among others.

Consumable Allocation : Auxiliary gases required for laser cutting (high-purity nitrogen/oxygen), welding wire, grinding wheels, bending protection films, and more.

5. Packaging & Logistics

Packaging fee : To prevent transport‑induced scratches, high‑end power cabinets must be packaged in custom wooden crates, pallets, bubble wrap, or pearl cotton; these packaging materials are billed and settled based on actual usage.

Shipping fee : Allocated based on delivery distance, long-haul logistics costs, or dedicated-vehicle delivery fees.

6. Management Fees and Corporate Profit (Margin)

It is used to cover the factory’s day-to-day operating expenses—such as rent for the premises, utilities, management salaries, and equipment depreciation—and to ensure a reasonable net profit for the enterprise, typically calculated on top of the total production cost. An additional 15%–25% charge applies. 。

II. Sheet Metal Quotation Calculation Formula (Industry Standard Template)

In real-world business negotiations, budget analysts at sheet-metal fabrication shops typically use the following closed-loop formula for quick cost verification:

\text{单件税前报价} = (\text{材料费} + \text{各工序加工费} + \text{表面处理费} + \text{五金耗材}) \times (1 + \text{管理费率}) + \text{包装运输费}

💡 Case Study Breakdown: Taking a Standard “Power Distribution Box” as an Example

Assume the use of 1.5 mm cold-rolled steel sheet, with a developed area of 2. $m^2$ , weighing approximately 24 kg, requires laser punching, 12 bends, spot welding, and double-sided painting.

Material costs : 24 kg × 1.1 (10% loss) × 6 yuan/kg = 158.4 yuan

Laser cutting fee : Calculated based on the time for slitting and punching = 30 yuan

Bending fee : 12 knives × 1.5 yuan/knife = 18 yuan

Welding and grinding fees : Approximately 20 minutes of man-hours = 25 yuan

Surface coating fee :4 $m^2$ (Double-sided) × 20 yuan/ $m^2$ = 80 yuan

Hardware rivet fasteners : 20 rivet nuts 10 yuan

Subtotal Production Cost : 158.4 + 30 + 18 + 25 + 80 + 10 = 321.4 yuan

Gross Profit and Administrative Expenses (At 20%): 321.4 × 20% = 64.28 yuan

Packaging and Shipping (City-wide cost sharing): 15 yuan

Final Estimated Quote per Unit (Pre-Tax) : 321.4 + 64.28 + 15 = 400.68 yuan

III. Key “Hidden Variables” That Influence Sheet Metal Pricing

Why do quotes from different manufacturers for the same set of drawings vary so significantly? Buyers should pay attention to the following points:

Minimum order quantity (volume discount) Sheet metal fabrication entails very high “first‑article costs” (prototype production, programming, machine tool setup, and trial bending all consume significant man-hours). When volumes are large—such as 1,000 parts—the programming and machine‑setup expenses can be spread across many units; by contrast, for a single prototype, the processing cost may double or even increase severalfold.

Normativity of Technical Drawings If the customer provides a vague PDF or a rough sketch, the factory will need to spend time re‑creating the 3D model and converting it, for which an additional fee will be charged. Design service fee ; If standard SolidWorks, Pro/E, or CAD drawings are provided, the product can be directly integrated into the production line, resulting in lower costs.

Tolerance and Process Rigor : If one blindly pursues high precision (e.g., demanding tolerances $\pm0.1\text{mm}$ Within, whereas the standard for ordinary sheet metal is $\pm0.3\text{mm}$ ), the factory would have to slow down its machinery, add additional full-inspection steps, and even raise its expected scrap rate, all of which would cause quotation prices to surge significantly.

A mature industrial sheet metal solution is one that… Design Optimization (Reducing the Number of Bends and Weld Joints) 、 Material utilization rate and Processing batch size Finding the optimal balance among these factors. A clear understanding of cost structure gives electrical‑equipment companies greater bargaining power and strategic leverage in non‑standard procurement.

Key words:

One-stop sheet metal fabrication manufacturer: from design to finished product delivery.

How does sheet metal fabrication affect the service life of electrical equipment?

Hunan Chengyuan Electrical CO.,LTD