{"id":9632,"date":"2025-11-18T16:41:15","date_gmt":"2025-11-18T08:41:15","guid":{"rendered":"https:\/\/dewintech.com\/?p=9632"},"modified":"2025-11-18T16:41:15","modified_gmt":"2025-11-18T08:41:15","slug":"como-se-evita-la-sustitucion-de-materiales-al-importar-piezas-metalicas-personalizadas-de-vietnam","status":"publish","type":"post","link":"https:\/\/dewintech.com\/es\/blog\/how-do-you-prevent-material-substitution-when-you-import-custom-metal-parts-from-vietnam\/","title":{"rendered":"\u00bfC\u00f3mo se previene la sustituci\u00f3n de materiales al importar piezas met\u00e1licas personalizadas de Vietnam?"},"content":{"rendered":"<p><iframe data-testid=\"embed-iframe\" style=\"border-radius:12px\" src=\"https:\/\/open.spotify.com\/embed\/episode\/6vu6EnX86iIJbXFFozg6vs?utm_source=generator&amp;theme=0\" width=\"100%\" height=\"152\" frameborder=\"0\" allowfullscreen=\"\" allow=\"autoplay; clipboard-write; encrypted-media; fullscreen; picture-in-picture\" loading=\"lazy\"><\/iframe><\/p>\n<p style=\"float: right; margin-left: 15px; margin-bottom: 15px;\">\n\u00a0 <img decoding=\"async\" src=\"https:\/\/dewintech.com\/wp-content\/uploads\/2025\/11\/1scene-from-inside-a-vietnamese-metal-parts-factory.png\" alt=\"Engineer examining blueprints in large metal workshop (ID#1)\" class=\"top-image-square\">\n<\/p>\n<p>I\u2019ve had parts that passed dimensional checks\u2014but failed on material strength. Why? Because the factory used \u201cequivalent\u201d steel, not what I specified.<a href=\"#footnote-1\"><sup>1<\/sup><\/a><\/p>\n<p><strong>To prevent material substitution when importing metal parts from Vietnam, you must enforce strict specification controls, demand traceable Mill Test Certificates, verify material with PMI testing, and lock in contract penalties for non-compliance.<\/strong><\/p>\n<p>What looks like a cost-saving shortcut for the supplier can turn into a costly recall for you. Let\u2019s break down how to stop this before it starts.<\/p>\n<h2>What certificate of material origin or mill test certificate (MTC) should you demand?<\/h2>\n<p>I&#8217;ve seen too many certificates that \u201clook real\u201d but don\u2019t match the drawing. That\u2019s a recipe for hidden risk.<\/p>\n<p>You must demand original <strong>Mill Test Certificates (MTCs)<\/strong> or <strong>Material Test Reports (MTRs)<\/strong> with heat numbers, mechanical\/chemical properties, and standard compliance\u2014issued by the original mill, not typed up by the supplier.<a href=\"#footnote-2\"><sup>2<\/sup><\/a><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/dewintech.com\/wp-content\/uploads\/2025\/11\/2desk-with-mtc-document-next-to-a-raw-stainless-ste.png\" alt=\"Precision measuring tools and metal bar on engineering drawing (ID#2)\" title=\"Engineering measurement\" \/><\/p>\n<h3>What a Proper MTC Should Include<\/h3>\n<table>\n<thead>\n<tr>\n<th>Field\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/th>\n<th>What to Look For\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Material Grade\u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>Exact match to PO (e.g., SS316L, AL6061-T6)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>Standard\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>ASTM, EN, JIS, etc.\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>Heat Number\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>Unique code for traceability to original melt<a href=\"#footnote-3\"><sup>3<\/sup><\/a>\u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>Mechanical Properties<\/td>\n<td>Yield, tensile, elongation, hardness\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>Chemical Composition\u00a0<\/td>\n<td>Breakdown of elements (e.g., Cr, Ni, Mo, Mn, C, Fe)\u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>Certificate Origin\u00a0 \u00a0<\/td>\n<td>Issued by the <strong>producing mill<\/strong>, not just local vendor<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Dive Deeper: How to Cross-Check MTCs<\/h3>\n<ul>\n<li>Verify that the <strong>heat number<\/strong> appears on both the certificate and the actual metal (e.g., stamped or tagged).\u00a0\u00a0<\/li>\n<li>Ask for <strong>PDF scans, not Word docs<\/strong>.\u00a0\u00a0<\/li>\n<li>Require <strong>dual-language reports (Vietnamese + English)<\/strong>.\u00a0\u00a0<\/li>\n<li>Match the chemical range to the spec sheet of your desired material (e.g., <strong>ASTM A276<\/strong> for stainless steels).<a href=\"#footnote-4\"><sup>4<\/sup><\/a>\u00a0\u00a0<\/li>\n<li>If your part must meet international regulatory standards (like for aerospace or medical use), confirm the mill is certified.<\/li>\n<\/ul>\n<h2>How should you structure factory audit and incoming material verification to catch substitution risk?<\/h2>\n<p>I once trusted a \u201ccertified supplier\u201d until an audit revealed they stored certified and uncertified bars in the same rack. That\u2019s how bad batches happen.<\/p>\n<p>You should include <strong>material traceability<\/strong> and inventory segregation in your supplier audits.<a href=\"#footnote-5\"><sup>5<\/sup><\/a> Also, implement an incoming material verification process that checks heat numbers, MTCs, and raw bar markings before production.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/dewintech.com\/wp-content\/uploads\/2025\/11\/3warehouse-in-a-vietnamese-factory-showing-clearly-.png\" alt=\"Organized warehouse with industrial shelves and clean floor (ID#3)\" title=\"Modern warehouse\" \/><\/p>\n<h3>Key Factory Audit Items<\/h3>\n<table>\n<thead>\n<tr>\n<th>Audit Category\u00a0 \u00a0 \u00a0 \u00a0<\/th>\n<th>What to Inspect\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Material Storage\u00a0 \u00a0 \u00a0<\/td>\n<td>Clear separation of different grades; labels visible\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>Heat Number Tracking<\/td>\n<td>Is each raw bar tagged with a heat number?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>MTC Filing System\u00a0 \u00a0<\/td>\n<td>Do they keep copies tied to batches?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>QA Process\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>Incoming material check SOP; record logs; defect response plan<\/td>\n<\/tr>\n<tr>\n<td>Calibration Records\u00a0<\/td>\n<td>For hardness testers, XRF guns, tensile testers, etc.\u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Dive Deeper: Build a Verification Loop<\/h3>\n<ol>\n<li>\n<p><strong>Raw Material Receiving Stage:<\/strong>\u00a0\u00a0<br \/>\n\u00a0 \u00a0<em> Match heat numbers from supplier delivery list to MTC and metal bar\u00a0\u00a0<br \/>\n\u00a0 \u00a0<\/em> Photograph bar markings\u00a0\u00a0<br \/>\n\u00a0 \u00a0* Check if delivery matches drawing and PO\u00a0\u00a0<\/p>\n<\/li>\n<li>\n<p><strong>Pre-Production Lock-in (First Article Inspection):<\/strong>\u00a0\u00a0<br \/>\n\u00a0 \u00a0<em> Have QC team verify again before production starts\u00a0\u00a0<br \/>\n\u00a0 \u00a0<\/em> Match drawing vs. raw stock vs. MTCs\u00a0\u00a0<\/p>\n<\/li>\n<li>\n<p><strong>Documentation Trail:<\/strong>\u00a0\u00a0<br \/>\n\u00a0 \u00a0<em> Create a <strong>heat-batch traceability chart<\/strong> (see next table)\u00a0\u00a0<br \/>\n\u00a0 \u00a0<\/em> Assign internal ID numbers for each bar\/piece to keep history<a href=\"#footnote-6\"><sup>6<\/sup><\/a>\u00a0\u00a0<\/p>\n<\/li>\n<\/ol>\n<h4>Example: Traceability Record Table<\/h4>\n<table>\n<thead>\n<tr>\n<th>Internal ID<\/th>\n<th>Supplier Batch<\/th>\n<th>Heat Number<\/th>\n<th>Material Spec\u00a0<\/th>\n<th>MTC Verified<\/th>\n<th>Used in Part #<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>R-102-01\u00a0 \u00a0<\/td>\n<td>VN-A23\u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>8A32765\u00a0 \u00a0 \u00a0<\/td>\n<td>ASTM A276 316L<\/td>\n<td>\u2705\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>5432-HG\u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>R-102-02\u00a0 \u00a0<\/td>\n<td>VN-A23\u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>8A32765\u00a0 \u00a0 \u00a0<\/td>\n<td>ASTM A276 316L<\/td>\n<td>\u2705\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>5432-HG\u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>This traceability is your safety net. Without it, you\u2019ll never know which customer got the wrong material.<\/p>\n<h2>What role does physical testing (e.g., spectrometer, PMI) play in guarding against substitution?<\/h2>\n<p>Once I was told a bar was SS304. One quick scan from a <strong>PMI gun<\/strong> (Positive Material Identification) showed it was actually SS201. Big difference, big risk.<a href=\"#footnote-7\"><sup>7<\/sup><\/a><\/p>\n<p>Physical material testing like PMI using <strong>XRF<\/strong> or <strong>OES<\/strong> is the most direct and non-destructive way to verify alloy composition on-site and detect any substitution.<a href=\"#footnote-8\"><sup>8<\/sup><\/a><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/dewintech.com\/wp-content\/uploads\/2025\/11\/4scene-from-a-certified-lab-e-g-t-v-sgs-in-vie.png\" alt=\"Technician conducting material hardness test in laboratory (ID#4)\" title=\"Lab inspection\" \/><\/p>\n<h3>Two Main Methods<\/h3>\n<table>\n<thead>\n<tr>\n<th>Method\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/th>\n<th>Description\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/th>\n<th>Use Case\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>XRF (X-Ray Fluorescence)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>Identifies elemental composition using X-rays, quick and portable\u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>Non-destructive checks at factory or port<\/td>\n<\/tr>\n<tr>\n<td>OES (Optical Emission Spectrometry)<\/td>\n<td>Burns sample to read emission spectrum; more accurate on light elements<\/td>\n<td>In-lab or factory test room\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Dive Deeper: Implementing PMI in Vietnam<\/h3>\n<ul>\n<li>Bring your own handheld <strong>XRF analyzer<\/strong> or hire labs that do PMI testing (e.g., QCML).<a href=\"#footnote-9\"><sup>9<\/sup><\/a>\u00a0\u00a0<\/li>\n<li>Or require third-party PMI testing from accredited labs.\u00a0\u00a0<\/li>\n<li>Create a <strong>PMI protocol<\/strong>:\u00a0\u00a0<br \/>\n\u00a0 1. 5% random testing for each heat lot\u00a0\u00a0<br \/>\n\u00a0 2. Mandatory scan for each critical-dimension part\u00a0\u00a0<br \/>\n\u00a0 3. Record &amp; photograph device screen for documentation\u00a0\u00a0<\/li>\n<li>For high-risk applications (oil &amp; gas, pressure fittings), consider <strong>100% PMI testing<\/strong>.<\/li>\n<\/ul>\n<p>Tip: Match PMI results against both the drawing spec and the MTC. If they don\u2019t line up \u2014 reject the batch.<\/p>\n<h2>How can you contractually secure traceability and penalty clauses for material substitution?<\/h2>\n<p>Suppliers may say, \u201cDon\u2019t worry, this material is equivalent.\u201d But \u201cequivalent\u201d doesn\u2019t mean compliant.<\/p>\n<p>You must clearly define <strong>traceability<\/strong> in the contract and include <strong>supplier quality clauses<\/strong> that mandate unbroken traceability back to the original mill heat, plus penalties for non-compliance.<a href=\"#footnote-10\"><sup>10<\/sup><\/a><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/dewintech.com\/wp-content\/uploads\/2025\/11\/5video-call-scene-buyer-reviewing-contr.png\" alt=\"Online meeting between engineer and factory staff (ID#5)\" title=\"Remote factory meeting\" \/><\/p>\n<h3>Recommended Contract Clauses<\/h3>\n<table>\n<thead>\n<tr>\n<th>Clause Category\u00a0 \u00a0 \u00a0 \u00a0<\/th>\n<th>Sample Language Example\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Material Specification<\/td>\n<td>\u201cMaterial must be [ASTM A240 Type 316L]; substitutions require written buyer approval.\u201d\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>Certification\u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>\u201cMill Test Certificates with matching heat numbers must be submitted for every lot.\u201d\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>Traceability\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>\u201cSupplier shall tag or mark each part with corresponding heat\/batch number traceable to MTC.\u201d\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>Audit Rights\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>\u201cBuyer reserves right to conduct material traceability audit at any time.\u201d\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>PMI Requirement\u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>\u201cRandom Positive Material Identification (PMI) testing will be conducted at buyer\u2019s discretion.\u201d\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<\/tr>\n<tr>\n<td>Penalties\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/td>\n<td>\u201cFailure to comply results in part rejection, rework at supplier cost, and reimbursement of inspection fees.\u201d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Dive Deeper: Enforceable Contract Logic<\/h3>\n<ul>\n<li>Require <strong>quality clauses<\/strong> that enforce traceability to raw material lot or heat number. Many companies include these in their supplier quality clauses.\u00a0\u00a0<\/li>\n<li>Hold back payment until the MTC and any PMI results are received and approved.\u00a0\u00a0<\/li>\n<li>Attach MTC-format examples as a contract appendix.\u00a0\u00a0<\/li>\n<li>For regulated industries, insist on the MTR being \u201coriginal mill certificate\u201d (not just a distributor copy).<\/li>\n<\/ul>\n<p>If you leave this vague, you invite excuses. Be explicit \u2014 and enforce it.<\/p>\n<h2>Conclusion<\/h2>\n<p>To prevent material substitution, you need more than trust. You need <strong>certified materials<\/strong>, <strong>traceability<\/strong>, <strong>on-site testing<\/strong>, and <strong>enforceable contracts<\/strong> \u2014 built into your Vietnam sourcing process from day one.<\/p>\n<hr \/>\n<h2>Footnotes<\/h2>\n<p><span id=\"footnote-1\">1. Material substitution directly impacts dimensional checks and final product integrity, leading to costly failures. <a href=\"#ref-1\">\u21a9\ufe0e<\/a><\/span><br \/>\n<span id=\"footnote-2\">2. MTCs and MTRs are primary documents for verifying material compliance to specified standards. <a href=\"#ref-2\">\u21a9\ufe0e<\/a><\/span><br \/>\n<span id=\"footnote-3\">3. Heat numbers are essential for linking the finished part back to the original certified material batch. <a href=\"#ref-3\">\u21a9\ufe0e<\/a><\/span><br \/>\n<span id=\"footnote-4\">4. ASTM A276 is a widely used specification standard for stainless steel bars and shapes. <a href=\"#ref-4\">\u21a9\ufe0e<\/a><\/span><br \/>\n<span id=\"footnote-5\">5. Effective supplier audits must verify proper segregation of certified versus uncertified raw material inventory. <a href=\"#ref-5\">\u21a9\ufe0e<\/a><\/span><br \/>\n<span id=\"footnote-6\">6. Maintaining a documentation trail with internal IDs is vital for long-term product liability and recall management. <a href=\"#ref-6\">\u21a9\ufe0e<\/a><\/span><br \/>\n<span id=\"footnote-7\">7. PMI testing, using handheld devices, provides instant, non-destructive verification of alloy grade on-site. <a href=\"#ref-7\">\u21a9\ufe0e<\/a><\/span><br \/>\n<span id=\"footnote-8\">8. XRF and OES are the industry standards for precise elemental analysis of metal components. <a href=\"#ref-8\">\u21a9\ufe0e<\/a><\/span><br \/>\n<span id=\"footnote-9\">9. QCML and similar certified third-party labs offer independent material verification services in Vietnam. <a href=\"#ref-9\">\u21a9\ufe0e<\/a><\/span><br \/>\n<span id=\"footnote-10\">10. Contractual clauses requiring MTC submission and traceability are fundamental to enforcing quality control. <a href=\"#ref-10\">\u21a9\ufe0e<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0 I\u2019ve had parts that passed dimensional checks\u2014but failed on material strength. Why? Because the factory used \u201cequivalent\u201d steel, not what I specified.1 To prevent material substitution when importing metal parts from Vietnam, you must enforce strict specification controls, demand traceable Mill Test Certificates, verify material with PMI testing, and lock in contract penalties for [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":9639,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[217,1],"tags":[],"class_list":["post-9632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-manufacturing","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How do you prevent material substitution when you import custom metal parts from Vietnam? - Dewin - Help You Make Custom Parts &amp; Assembilies in Vietnam &amp; China<\/title>\n<meta name=\"robots\" content=\"noindex, follow\" \/>\n<meta property=\"og:locale\" content=\"es_MX\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How do you prevent material substitution when you import custom metal parts from Vietnam?\" \/>\n<meta property=\"og:description\" content=\"\u00a0 I\u2019ve had parts that passed dimensional checks\u2014but failed on material strength. Why? Because the factory used \u201cequivalent\u201d steel, not what I specified.1 To prevent material substitution when importing metal parts from Vietnam, you must enforce strict specification controls, demand traceable Mill Test Certificates, verify material with PMI testing, and lock in contract penalties for [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/dewintech.com\/es\/blog\/como-se-evita-la-sustitucion-de-materiales-al-importar-piezas-metalicas-personalizadas-de-vietnam\/\" \/>\n<meta property=\"og:site_name\" content=\"Dewin - Help You Make Custom Parts &amp; Assembilies in Vietnam &amp; China\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-18T08:41:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/dewintech.com\/wp-content\/uploads\/2025\/11\/1scene-from-inside-a-vietnamese-metal-parts-factory.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1365\" \/>\n\t<meta property=\"og:image:height\" content=\"1024\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Beryl\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Beryl\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutos\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"How do you prevent material substitution when you import custom metal parts from Vietnam? - Dewin - Help You Make Custom Parts &amp; Assembilies in Vietnam &amp; China","robots":{"index":"noindex","follow":"follow"},"og_locale":"es_MX","og_type":"article","og_title":"How do you prevent material substitution when you import custom metal parts from Vietnam?","og_description":"\u00a0 I\u2019ve had parts that passed dimensional checks\u2014but failed on material strength. 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