{"id":7607,"date":"2026-08-28T09:59:53","date_gmt":"2026-08-28T09:59:53","guid":{"rendered":"https:\/\/chinametalfoundry.com\/blog\/metal-casting-guide\/"},"modified":"2026-09-04T06:24:49","modified_gmt":"2026-09-04T06:24:49","slug":"guia-de-fundicion-de-metales","status":"publish","type":"post","link":"https:\/\/chinametalfoundry.com\/es\/blog\/metal-casting-guide\/","title":{"rendered":"Fundici\u00f3n de metales: la gu\u00eda completa sobre procesos, materiales y fabricaci\u00f3n"},"content":{"rendered":"
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If you are sourcing custom metal parts in volume, you have probably asked the same question every purchasing manager eventually asks: **how do I pick the right casting process and the right alloy without paying for two prototypes and a tooling change?** This **metal casting guide** walks you through…<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Gu\u00eda\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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What Is Metal Casting?<\/h2><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Metal casting<\/a> is a family of manufacturing processes in which molten metal is poured into a reusable or expendable mold, allowed to solidify, and then finished to specification. According to the American Foundry Society (AFS)<\/a>, the metal casting industry supplies roughly 90% of all manufactured goods<\/strong> y all metal goods rely on cast components at some point in their production<\/strong>. For buyers, casting is the most economical way to produce complex near-net-shape parts in alloys that are difficult or impossible to machine economically \u2014 bronze, cast iron, ductile iron, zinc alloys, and high-alloy stainless.<\/p>\n

> Buyer takeaway:<\/strong> If your part has internal cavities, complex 3D geometry, or needs to be made in an alloy that is hard to machine, casting almost always wins on cost-per-part above 200 units.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Metal Casting Guide: Main Processes Compared<\/h2><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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There is no single “best” metal casting process. The four families below cover roughly 95% of industrial B2B casting work. Use this Gu\u00eda de fundici\u00f3n de metales<\/strong> table to align your part with the right process before you brief a foundry.<\/p>\nProcess<\/th>Typical Tolerance<\/th>Min. Wall Thickness<\/th>Surface Finish (Ra)<\/th>Best For<\/th>Typical Lot Size<\/th><\/tr>\n\n
Fundici\u00f3n en arena<\/a><\/td>\u00b1 0.5\u20131.5 mm<\/td>3\u20135 mm<\/td>6.3\u201312.5 \u00b5m<\/td>Large parts, low-to-mid volume, ferrous alloys<\/td>50\u201310,000<\/td><\/tr>\n
Fundici\u00f3n por cera perdida<\/a><\/td>\u00b1 0.1\u20130.4 mm (CT4\u2013CT6)<\/td>1.0\u20131.5 mm<\/td>1.6\u20133.2 \u00b5m<\/td>Complex geometry, stainless & carbon steel, aerospace<\/td>100\u201350,000<\/td><\/tr>\n
[Die Casting[\/die-casting-services\/)<\/td>\u00b1 0.05\u20130.15 mm<\/td>1.0\u20132.0 mm<\/td>0.8\u20131.6 \u00b5m<\/td>High-volume non-ferrous (A356, A380, Zamak)<\/td>5,000\u20131,000,000<\/td><\/tr>\n
Centrifugal Casting<\/td>\u00b1 0.3\u20131.0 mm<\/td>4\u20136 mm<\/td>3.2\u20136.3 \u00b5m<\/td>Cylindrical parts (pipes, sleeves, bushings)<\/td>100\u201320,000<\/td><\/tr>\n<\/table>\n

For a side-by-side methodology and cost-per-part breakdown, see our cluster article on Sand Casting vs Investment Casting: Which to Choose<\/strong> (publishing soon).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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How to Choose the Right Casting Alloy<\/h2><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Material choice drives cost, weight, corrosion resistance, and final machining. Below is the same alloy matrix we use in our own DFM review.<\/p>\n

Alloy Group<\/th>Examples<\/th>Tensile Strength<\/th>Corrosion Resistance<\/th>Machinability<\/th>Common Applications<\/th><\/tr>\n\n
Hierro fundido<\/td>ASTM A48 Class 30\/40, EN-GJL-250<\/td>200\u2013400 MPa<\/td>Low (needs coating)<\/td>Excelente<\/td>Pump housings, valve bodies, machine bases<\/td><\/tr>\n
Hierro d\u00factil<\/td>ASTM A536 65-45-12, 80-55-06<\/td>400\u2013600 MPa<\/td>Moderate<\/td>Bien<\/td>Crankshafts, gears, automotive suspension<\/td><\/tr>\n
Carbon \/ Low-alloy Steel<\/td>ASTM A216 WCB, A352 LCC<\/td>415\u2013585 MPa<\/td>Moderate<\/td>Bien<\/td>Pressure vessels, mining equipment<\/td><\/tr>\n
Acero inoxidable<\/td>304, 316, 17-4PH, 2205 duplex<\/td>485\u20131,200 MPa<\/td>Excelente<\/td>Justo<\/td>Marine, food, medical, chemical<\/td><\/tr>\n
Aluminum Alloys<\/td>A356, A380, A383, ADC12<\/td>180\u2013320 MPa<\/td>Good (anodized: excellent)<\/td>Excelente<\/td>Automotive, electronics, lightweighting<\/td><\/tr>\n
Copper \/ Brass \/ Bronze<\/td>C83600, C93200, C95400<\/td>200\u2013500 MPa<\/td>Excellent (esp. marine)<\/td>Bien<\/td>Valves, fittings, marine propellers<\/td><\/tr>\n
Zinc Alloys<\/td>Zamak 3, Zamak 5, ZA-8<\/td>220\u2013370 MPa<\/td>Bien<\/td>Excelente<\/td>Small intricate parts, hardware<\/td><\/tr>\n<\/table>\n

> Buyer takeaway:<\/strong> When two alloys will work, pick the one that is already in your foundry’s production schedule. Switching alloy families mid-project adds setup cost and lead time.<\/p>\n

For a full alloy selection framework, read our cluster article on How to Choose the Right Casting Alloy<\/strong> (publishing soon).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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The 4-Step Decision Tree for Choosing a Casting Method<\/h2><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Use this decision tree the same way our engineering team does during DFM review.<\/p>\n

1. Is the annual volume above 5,000 units and the part weight under 5 kg?<\/strong>
\u2192 Die casting[\/die-casting-services\/) (Al, Zn, Mg)
2. Does the part need complex internal geometry, threads, or \u2265 CT6 tolerance?<\/strong>
\u2192 [Investment casting<\/a> (steel, stainless, copper, Al)
3. Is the part large (>300 mm), heavy, or in iron\/steel with lower tolerance needs?<\/strong>
\u2192 Sand casting<\/a> (green sand or resin-coated)
4. Is the part cylindrical, hollow, or a sleeve\/bushing?<\/strong>
\u2192 Centrifugal casting<\/p>\n

If you are still on the fence between casting and machining a near-net-shape blank, our CNC Machining vs Casting<\/strong> comparison walks through the unit-cost crossover at common lot sizes (publishing soon).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Casting Tolerances and Surface Finish Standards<\/h2><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Tolerance and surface finish are where most RFQs go wrong. The two standards every B2B buyer should reference are:<\/p>\n

– ISO 8062<\/strong> (cast dimensional tolerances) \u2014 defines CT4 to CT13. Most investment castings fall in CT4\u2013CT6; sand castings in CT8\u2013CT11. Tightening from CT8 to CT6 typically increases cost 30\u201380%<\/strong>.
– ISO 1302 \/ ASME Y14.36M<\/strong> (surface texture) \u2014 Ra values from 0.8 \u00b5m (die cast) to 12.5 \u00b5m (as-cast sand). Most functional cast surfaces need a secondary CNC machining<\/a> operation to reach Ra \u2264 0.8 \u00b5m.<\/p>\n

If your part requires Ra \u2264 0.4 \u00b5m on functional surfaces, you should plan for surface treatment<\/a> (polishing, grinding, or hard anodizing) on top of casting + machining.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Common Casting Defects and How to Prevent Them<\/h2><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The five defects that account for the majority of B2B casting rejections are porosity, shrinkage cavities, cold shuts, sand inclusions, and surface cracks. Each has a known root cause and a known prevention.<\/p>\n

– Porosity (gas)<\/strong> \u2014 caused by trapped air or steam in the mold. Prevent with proper venting, degassing (for aluminum), and controlled pouring temperature.
– Shrinkage cavities<\/strong> \u2014 caused by inadequate risering. Prevent with simulation-backed riser design (we use MAGMA for critical parts).
– Cold shuts<\/strong> \u2014 caused by low pouring temperature or slow pour. Prevent with temperature control and proper sprue design.
– Sand inclusions<\/strong> \u2014 caused by mold erosion. Prevent with proper sand binder, mold hardness, and filtration.
– Surface cracks<\/strong> \u2014 caused by uneven cooling or excessive restraint. Prevent with controlled cooling and shake-out timing.<\/p>\n

A full defect-by-defect playbook with photos and root-cause flowcharts is in our Common Casting Defects and How to Prevent Them<\/strong> guide (publishing soon).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Quality Control and Certifications You Should Verify<\/h2><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Before signing a PO, confirm your foundry can deliver the following \u2014 and ask for a sample of the actual certificate, not just a logo on a website:<\/p>\n

Standard<\/th>What It Covers<\/th>When You Need It<\/th><\/tr>\n\n
ISO 9001:2015<\/td>Quality management system baseline<\/td>Always<\/td><\/tr>\n
IATF 16949<\/td>Automotive QMS<\/td>Automotive casting<\/a> projects<\/td><\/tr>\n
ISO 14001<\/td>Environmental management<\/td>EU-bound shipments<\/td><\/tr>\n
ASTM E192<\/td>Radiographic testing reference<\/td>Pressure-containing parts<\/td><\/tr>\n
ASTM A703<\/td>Steel casting general requirements<\/td>Steel castings<\/td><\/tr>\n
NADCA<\/td>Die casting dimensional standards<\/td>Die castings<\/td><\/tr>\n
EN 10204 3.1 \/ 3.2<\/td>Material certificate<\/td>EU pressure equipment<\/td><\/tr>\n<\/table>\n

Supro MFG is ISO 9001:2015 certified and issues EN 10204 3.1 mill certificates on every heat-treated or pressure-containing shipment. See our services overview<\/a> for the full QC documentation we provide.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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What to Send in Your First RFQ to a Casting Supplier<\/h2><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The fastest way to get a useful quote is to send a tight RFQ. We use this exact 7-item checklist internally for our own suppliers \u2014 share it with any new vendor:<\/p>\n

1. 3D model<\/strong> (STEP \/ IGES) \u2014 not just a drawing
2. 2D drawing with GD&T<\/strong> \u2014 critical tolerances, datums, surface finish callouts
3. Material specification<\/strong> \u2014 alloy grade and standard (e.g. “ASTM A536 65-45-12”)
4. Annual volume<\/strong> \u2014 and tooling amortization expectation
5. Quality requirements<\/strong> \u2014 certificates, NDT scope, PPAP if automotive
6. Surface finish<\/strong> \u2014 as-cast, machined, or finished
7. Target price and lead time<\/strong> \u2014 including whether tooling is one-time or amortized<\/p>\n

If you are unsure how to structure a foundry-ready RFQ, our engineering team can review your package at no charge. Send us your 3D model and drawing<\/a> and we will come back with a DFM note within one business day.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Frequently Asked Questions<\/h2><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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What is the difference between casting and forging?<\/strong>
Casting pours liquid metal into a mold; forging presses or hammers a solid billet into shape. Forged parts are stronger along the grain direction; cast parts can be more complex and cheaper in volume. For most B2B applications under 500 MPa, casting wins on geometry freedom and cost.<\/p>\n

Which casting process is the cheapest?<\/strong>
Sand casting is almost always the cheapest per part for low volumes and large parts. Die casting wins on unit cost above 5,000 pieces, but the upfront tooling ($5,000\u2013$50,000) only amortizes at higher volumes.<\/p>\n

What tolerances can I expect from investment casting?<\/strong>
Standard investment casting is CT5\u2013CT7 (ISO 8062). For tighter work, tooling can be adjusted to CT4. Going below CT4 is usually not cost-effective \u2014 switch to machined-from-billet.<\/p>\n

Can I cast stainless steel?<\/strong>
Yes. 304, 316, 17-4PH, 2205 duplex, and most other stainless grades are routinely investment cast. We cover the full process in our investment casting service page<\/a>.<\/p>\n

What is the typical lead time for a casting order?<\/strong>
Sampling: 3\u20135 weeks for investment cast, 2\u20133 weeks for sand cast, 4\u20136 weeks for die cast tooling. Production runs add 4\u20138 weeks depending on lot size and post-machining.<\/p>\n

Do you ship internationally?<\/strong>
Yes. Supro MFG ships to North America, the EU, Southeast Asia, and Australia with full export documentation, heat certificates, and FOB \/ CIF \/ DDP terms. Solicitar una cotizaci\u00f3n<\/a> to discuss your shipment.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Conclusion<\/h2><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A good Gu\u00eda de fundici\u00f3n de metales<\/strong> does not end at “pick a process.” The real buying decisions \u2014 alloy, tolerance, finish, certification, RFQ structure \u2014 are where projects succeed or fail. Use the decision tree, alloy matrix, and defect playbook above as your first-pass filter, then bring your shortlisted foundries into the conversation early. The earlier a casting supplier is in your DFM loop, the lower your tooling cost and the faster your time-to-market.<\/p>\n

Supro MFG runs sand, investment, and die casting under one roof in China, with in-house CNC machining<\/a>, mold making<\/a>, tratamiento t\u00e9rmico<\/a>, and surface treatment<\/a>. We support customers in automotive<\/a>, marine<\/a>, agricultural<\/a>, valve and pump<\/a>, and aluminum \/ copper alloy<\/a> applications.<\/p>\n

Send us your 3D model and we will get back to you with a DFM note and a target price within one business day.<\/a><\/p>\n

—<\/p>\n

Published by Supro MFG Engineering Team \u00b7 Reviewed against ISO 8062, AFS, NADCA, and EN 10204 standards.<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Need a DFM Review on Your Part?<\/h2>

Send us your 3D model and drawing. We come back with a DFM note and a target price within one business day.<\/p>

Request a Quote →<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

If you are sourcing custom metal parts in volume, you have probably asked the same question every purchasing manager eventually […]<\/p>\n","protected":false},"author":5,"featured_media":7605,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[15],"tags":[46,47,45,44,42,43],"class_list":["post-7607","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs","tag-casting-materials","tag-casting-process","tag-die-casting","tag-investment-casting","tag-metal-casting","tag-sand-casting"],"_links":{"self":[{"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/posts\/7607","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/comments?post=7607"}],"version-history":[{"count":9,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/posts\/7607\/revisions"}],"predecessor-version":[{"id":7641,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/posts\/7607\/revisions\/7641"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/media\/7605"}],"wp:attachment":[{"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/media?parent=7607"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/categories?post=7607"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chinametalfoundry.com\/es\/wp-json\/wp\/v2\/tags?post=7607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}