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Metal
Machining

We offer custom-machined metal parts with short lead times and highly competitive pricing. A wide range of metals and surface finishing processes is available to meet your needs for high-quality prototypes and production parts.

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Steel

Table of Contents

Basic Definition

Steel is an iron-carbon alloy containing less than 2.11% carbon by mass, mixed with other alloying elements such as chromium, nickel, manganese and silicon. It is the most widely used structural metal worldwide.

Core Characteristics

  • High tensile strength and hardness, excellent load-bearing capacity for heavy-duty structures.
  • Good machinability, weldability and formability, suitable for casting, forging, stamping and CNC machining.
  • Cost-effective raw material compared with aluminum, titanium and copper alloys.
  • Ordinary carbon steel easily oxidizes and rusts in humid or salty air; alloy steels like stainless steel gain strong anti-corrosion performance.
  • Wide adjustable properties: carbon content and alloy composition can be modified to make soft ductile steel or ultra-hard wear-resistant steel.

Main Classifications

  1. Carbon Steel Low/medium/high carbon grades. Cheap, strong, easy to process, used for machinery frames, molds, construction steel, fasteners. Poor rust resistance without coating.
  2. Stainless Steel (Alloy Steel) With chromium and nickel additives (304, 316, 430 etc.). A protective chromium oxide passive film forms automatically on surface, resisting rust, acid and seawater. Common for medical parts, food equipment, pipelines and decorative hardware.
  3. Alloy Structural Steel / Tool Steel Added molybdenum, vanadium etc. High hardness and wear resistance, applied to cutting tools, gears, bearings and hydraulic parts.

Common Surface Treatments

Sandblasting, painting, powder coating, electroplating, hot-dip galvanizing, electropolishing (for stainless steel only).

Typical Applications

Construction frames, automobile parts, molds, fasteners, mechanical equipment, stainless sanitary fittings, ship components, cutting tools.

Material parameters

Parameter NameParameter value
Price$$$
Delivery time10days
Wall thickness0.75MM
tolerance±0.005 inch（±0.125mm）
Maximum part size200 x 80 x 100 cm
Available Steel Grades:Carbon Steel: 1018, 1020, 1025, 1045, 1215, 4130, 4140, 4340, 5140, A36, ST37
Alloy Steel: 4J36
Die Steel: 718H, P20, S136, S7
Chisel Tool Steel: D2/SKD11, SKD61
High Speed Steel: SKH51 Spring Steel: 1566, 9260 Tool Steel: A2 Bearing Steel: E51100/SUJ1, E52100/SUJ2
Galvanized Steel: SGCC / SECC SPCC

Frequently Asked Questions

  To shorten the delivery cycle of CNC workpieces, we start with the documents submitted by customers. Please provide complete and clear 2D drawings, 3D models, dimensional tolerances, surface requirements, and processing specifications, and specify special materials, surface treatments, and assembly standards. Avoid incomplete drawings, ambiguous markings, and version confusion.
Complete documents enable direct programming, order splitting, and production scheduling, cutting down repeated confirmation and supplementary work. Customers are also advised to finalize order quantity, delivery schedule, and special requirements in advance. Eliminating repeated communication and rework risks at the source accelerates the whole process and effectively shortens the overall lead time.

  With 12 years of expertise in CNC machining, YUEYI stands out from other manufacturers and middlemen. Our factory covers an area of 4,000 mu and is equipped with over 100 processing machines. We achieve a machining precision up to 0.001 mm, capable of producing high-precision components. Backed by standardized production management, our on-time delivery rate reaches 98%. As a direct manufacturer with full in-house production capacity, we control every production link without outsourcing. We deliver consistent quality, outstanding precision and reliable lead time, making us your trustworthy partner for CNC precision machining.

  Fast delivery is one of our key strengths. For 3D printing orders, we support delivery within 3 days, ideal for rapid prototyping and urgent sample requests. For regular CNC machining projects, the standard lead time is around 3 weeks.
We manage the whole process in-house, from drawing review and process planning to production, quality inspection, and shipment, with no intermediate links. Equipped with complete facilities and an experienced team, we reliably fulfill both urgent sample orders and mass production. We guarantee stable lead time and consistent quality to keep your projects on track.

  We offer a full range of surface treatments with rich color options. Our services include anodizing, powder coating, spray painting, electroplating, wire drawing, sandblasting, and polishing. Anodizing features various colors and strong anti-corrosion performance for aluminum parts. Powder coating and spray painting come with extensive color selections and durable coatings. Electroplating enhances luster and rust resistance. Wire drawing creates fine linear textures, while sandblasting delivers a matte finish. Polishing achieves a bright and smooth surface. All finishes can be customized in colors and styles to match your application needs.

  Yes, we fully provide complete material certificates and relevant test reports for all CNC-machined parts. All raw materials are sourced from qualified suppliers with authentic documentation. We can offer material certifications, dimension inspection reports, and quality test records upon request. Every product is strictly inspected before delivery. These official documents fully guarantee material compliance and product quality, supporting your quality audit and project requirements.

  We take strict quality control measures in advance to prevent non-conforming products. Every workpiece is fully inspected dimensionally and visually during and after production to ensure full compliance with design drawings and specifications.
In the rare case of non-compliant items, we will take immediate responsibility. We will promptly confirm the issues with you, then arrange free rework or remanufacturing as required. All related costs will be borne by us. We will also analyze the root cause to optimize our processes and avoid similar problems recurring. Our goal is to deliver qualified products steadily and safeguard your project progress.

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