{"id":3503,"date":"2026-02-03T02:18:50","date_gmt":"2026-02-03T02:18:50","guid":{"rendered":"https:\/\/www.leierwocasting.com\/?p=3503"},"modified":"2026-02-03T02:20:36","modified_gmt":"2026-02-03T02:20:36","slug":"5-key-factors-impacting-duplex-stainless-steel-investment-casting-quality","status":"publish","type":"post","link":"https:\/\/www.leierwocasting.com\/ar\/5-key-factors-impacting-duplex-stainless-steel-investment-casting-quality\/","title":{"rendered":"5 \u0639\u0648\u0627\u0645\u0644 \u0631\u0626\u064a\u0633\u064a\u0629 \u062a\u0624\u062b\u0631 \u0639\u0644\u0649 \u062c\u0648\u062f\u0629 \u0635\u0628 \u0627\u0644\u0627\u0633\u062a\u062b\u0645\u0627\u0631 \u0641\u064a \u0627\u0644\u0641\u0648\u0644\u0627\u0630 \u0627\u0644\u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0635\u062f\u0623 \u0627\u0644\u0645\u0632\u062f\u0648\u062c"},"content":{"rendered":"<p class=\"has-small-font-size\"><strong>\u0645\u0631\u062d\u0628\u0627\u064b \u0628\u0643\u0645 \u0641\u064a \u0645\u062f\u0648\u0646\u062a\u064a!<\/strong><\/p>\n\n\n\n<p class=\"has-small-font-size\">\u064a\u0633\u0639\u062f\u0646\u064a \u0648\u062c\u0648\u062f\u0643 \u0647\u0646\u0627! \u0642\u0628\u0644 \u0623\u0646 \u0646\u062a\u0639\u0645\u0642 \u0641\u064a \u0627\u0644\u0645\u062d\u062a\u0648\u0649\u060c \u0623\u0648\u062f \u0623\u0646 \u062a\u0646\u0636\u0645\u0648\u0627 \u0625\u0644\u064a\u0651 \u0639\u0644\u0649 \u0645\u0646\u0635\u0627\u062a \u0627\u0644\u062a\u0648\u0627\u0635\u0644 \u0627\u0644\u0627\u062c\u062a\u0645\u0627\u0639\u064a. \u0647\u0646\u0627\u0643 \u0623\u0634\u0627\u0631\u0643\u0643\u0645 \u0623\u0641\u0643\u0627\u0631\u064b\u0627 \u0625\u0636\u0627\u0641\u064a\u0629\u060c \u0648\u0623\u062a\u0648\u0627\u0635\u0644 \u0645\u0639 \u0645\u062c\u062a\u0645\u0639\u0646\u0627 \u0627\u0644\u0631\u0627\u0626\u0639\u060c \u0648\u0623\u064f\u0637\u0644\u0639\u0643\u0645 \u0639\u0644\u0649 \u0622\u062e\u0631 \u0627\u0644\u0623\u062e\u0628\u0627\u0631. \u0625\u0644\u064a\u0643\u0645 \u0643\u064a\u0641\u064a\u0629 \u0627\u0644\u0628\u0642\u0627\u0621 \u0639\u0644\u0649 \u062a\u0648\u0627\u0635\u0644:<\/p>\n\n\n\n<p class=\"has-small-font-size\">\ud83d\udcd8 <strong>\u0641\u064a\u0633\u0628\u0648\u0643:<\/strong> <a href=\"https:\/\/www.facebook.com\/people\/Shanghai-Leierwo-Industry-Trade-Co-Ltd\/61574022590718\/\" target=\"_blank\" rel=\"noopener\">\u0634\u0631\u0643\u0629 \u0634\u0646\u063a\u0647\u0627\u064a \u0644\u064a\u064a\u0631\u0648\u0648 \u0627\u0644\u0635\u0646\u0627\u0639\u064a\u0629 \u0627\u0644\u062a\u062c\u0627\u0631\u064a\u0629 \u0627\u0644\u0645\u062d\u062f\u0648\u062f\u0629<\/a><\/p>\n\n\n\n<p class=\"has-small-font-size\">\u0627\u0644\u0622\u0646\u060c \u0644\u0646\u0646\u0637\u0644\u0642 \u0641\u064a \u0647\u0630\u0647 \u0627\u0644\u0631\u062d\u0644\u0629 \u0645\u0639\u064b\u0627! \u0622\u0645\u0644 \u0623\u0646 \u062a\u062c\u062f\u0648\u0627 \u0647\u0630\u0627 \u0627\u0644\u0645\u062d\u062a\u0648\u0649 \u0645\u0641\u064a\u062f\u064b\u0627 \u0648\u0645\u064f\u0644\u0647\u0645\u064b\u0627 \u0648\u0642\u064a\u0651\u0645\u064b\u0627. \u0647\u064a\u0627 \u0628\u0646\u0627!<\/p>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>\u062c\u062f\u0648\u0644 \u0627\u0644\u0645\u062d\u062a\u0648\u064a\u0627\u062a<\/h2><nav><ul><li><a href=\"#introduction\">\u0645\u0642\u062f\u0645\u0629<\/a><\/li><li><a href=\"#undefined-1\">Material Selection: The Foundation of High-Quality Castings<\/a><ul><li><a href=\"#undefined-2\">Chemical Composition and Alloy Grade<\/a><\/li><li><a href=\"#undefined-3\">Supplier Quality and Traceability<\/a><\/li><li><a href=\"#undefined-4\">Microstructural Considerations<\/a><\/li><\/ul><\/li><li><a href=\"#undefined-5\">Casting Process Control: Temperature, Mold, and Pouring Techniques<\/a><ul><li><a href=\"#undefined-6\">Mold Design and Thermal Management<\/a><\/li><li><a href=\"#undefined-7\">Pouring Temperature and Rate<\/a><\/li><li><a href=\"#undefined-8\">Solidification and Cooling Rates<\/a><\/li><\/ul><\/li><li><a href=\"#undefined-9\">Design Considerations: Geometry, Wall Thickness, and Flow<\/a><ul><li><a href=\"#undefined-10\">Wall Thickness Uniformity<\/a><\/li><li><a href=\"#undefined-11\">Radii and Fillets<\/a><\/li><li><a href=\"#undefined-12\">Gating, Runners, and Pouring Channels<\/a><\/li><\/ul><\/li><li><a href=\"#undefined-13\">Heat Treatment and Post-Casting Processing<\/a><ul><li><a href=\"#undefined-14\">Solution Annealing for Duplex Balance<\/a><\/li><li><a href=\"#undefined-15\">Stress Relief and Machining Considerations<\/a><\/li><\/ul><\/li><li><a href=\"#undefined-16\">Surface Quality and Inspection<\/a><ul><li><a href=\"#undefined-17\">\u0627\u0644\u0627\u062e\u062a\u0628\u0627\u0631 \u063a\u064a\u0631 \u0627\u0644\u0645\u062f\u0645\u0631 (NDT)<\/a><\/li><li><a href=\"#undefined-18\">Surface Finish and Passivation<\/a><\/li><\/ul><\/li><li><a href=\"#undefined-19\">Table: Typical Duplex Stainless Steel Investment Casting Specifications<\/a><\/li><li><a href=\"#undefined-20\">Advanced Considerations: Industrial Standards and Expert Opinions<\/a><\/li><li><a href=\"#undefined-21\">\u0627\u0644\u0639\u064a\u0648\u0628 \u0627\u0644\u0634\u0627\u0626\u0639\u0629 \u0648\u0643\u064a\u0641\u064a\u0629 \u0627\u0644\u0648\u0642\u0627\u064a\u0629 \u0645\u0646\u0647\u0627<\/a><\/li><li><a href=\"#undefined-22\">\u062e\u0627\u062a\u0645\u0629<\/a><\/li><li><a href=\"#undefined-23\">\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/a><ul><li><a href=\"#what-are-the-most-critical-duplex-stainless-steel-grades-for-casting\">What are the most critical duplex stainless steel grades for casting?<\/a><\/li><\/ul><\/li><li><a href=\"#why-is-phase-balance-important\">Why is phase balance important?<\/a><ul><li><a href=\"#how-do-wall-thickness-variations-affect-quality\">How do wall thickness variations affect quality?<\/a><\/li><li><a href=\"#what-are-the-typical-defects-in-duplex-stainless-steel-casting\">What are the typical defects in duplex stainless steel casting?<\/a><\/li><li><a href=\"#what-heat-treatment-is-recommended\">What heat treatment is recommended?<\/a><\/li><li><a href=\"#can-cfd-simulations-help-in-casting-design\">Can CFD simulations help in casting design?<\/a><\/li><li><a href=\"#how-often-should-ndt-inspections-be-performed\">How often should NDT inspections be performed?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"introduction\">\u0645\u0642\u062f\u0645\u0629<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"505\" height=\"266\" src=\"https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-12.png\" alt=\"\u0635\u0628 \u0627\u0644\u0627\u0633\u062a\u062b\u0645\u0627\u0631 \u0627\u0644\u0645\u0632\u062f\u0648\u062c \u0645\u0646 \u0627\u0644\u0641\u0648\u0644\u0627\u0630 \u0627\u0644\u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0635\u062f\u0623\" class=\"wp-image-3506\" style=\"width:500px\" srcset=\"https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-12.png 505w, https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-12-300x158.png 300w, https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-12-18x9.png 18w\" sizes=\"auto, (max-width: 505px) 100vw, 505px\" \/><\/figure>\n\n\n\n<p>In modern industrial applications, from chemical processing to offshore oil and gas platforms, the demand for components that combine <strong>exceptional corrosion resistance, high strength, and durability<\/strong> has never been higher. <a href=\"https:\/\/www.leierwocasting.com\/ar\/stainless-steel-castings\/\">Duplex stainless steel investment casting<\/a> meets this demand by providing a unique combination of mechanical and chemical properties that outperform traditional austenitic or ferritic stainless steels.<\/p>\n\n\n\n<p>Recent studies by the International Stainless Steel Forum (ISSF) indicate that <strong>duplex stainless steel components reduce maintenance costs by up to 30% in harsh environments<\/strong>, thanks to their enhanced resistance to chloride-induced stress corrosion cracking. Moreover, the alloy&#8217;s <strong>high yield strength, often twice that of standard 304 stainless steel<\/strong>, allows engineers to design lighter components without compromising performance.<\/p>\n\n\n\n<p>Despite these advantages, producing high-quality castings is <strong>highly sensitive to process parameters, material selection, and design choices<\/strong>. A small deviation can lead to porosity, microstructural imbalance, or premature failure. This article explores <strong>five key factors impacting duplex stainless steel investment casting quality<\/strong>, provides practical insights, includes real industrial data, and outlines standards to follow.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"undefined-1\">Material Selection: The Foundation of High-Quality Castings<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-2\">Chemical Composition and Alloy Grade<\/h3>\n\n\n\n<p>Duplex stainless steel combines austenitic and ferritic phases, typically in a <strong>50\/50 balance<\/strong>, which provides both toughness and corrosion resistance. Selecting the correct grade is crucial. Common grades include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SAF 2205:<\/strong> Chromium 22%, Nickel 5\u20136.5%, Molybdenum 3%, ideal for chemical and marine applications.<\/li>\n\n\n\n<li><strong>SAF 2507:<\/strong> Chromium 25%, Nickel 7%, Molybdenum 4%, used in aggressive chloride environments.<\/li>\n<\/ul>\n\n\n\n<p>According to a 2021 study by the Nickel Institute, <strong>components cast with SAF 2507 exhibited a 45% improvement in pitting resistance compared to SAF 2205<\/strong> under identical conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-3\">Supplier Quality and Traceability<\/h3>\n\n\n\n<p>High-quality input materials reduce defects caused by inclusions or contamination. Engineers should always request <strong>certified mill test reports<\/strong> and verify chemical composition. Traceability is particularly important in industries like oil &amp; gas, where failure could lead to safety hazards and costly downtime.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-4\">Microstructural Considerations<\/h3>\n\n\n\n<p>The ferrite-austenite balance directly affects corrosion resistance and toughness. ASTM A923 defines <strong>critical microstructural testing methods<\/strong>, including the Strauss test, to detect harmful intermetallic phases such as sigma phase.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"undefined-5\">Casting Process Control: Temperature, Mold, and Pouring Techniques<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"513\" height=\"469\" src=\"https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-05.png\" alt=\"\u0635\u0628 \u0627\u0644\u0627\u0633\u062a\u062b\u0645\u0627\u0631 \u0627\u0644\u0645\u0632\u062f\u0648\u062c \u0645\u0646 \u0627\u0644\u0641\u0648\u0644\u0627\u0630 \u0627\u0644\u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0635\u062f\u0623\" class=\"wp-image-3507\" style=\"width:500px\" srcset=\"https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-05.png 513w, https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-05-300x274.png 300w, https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-05-13x12.png 13w\" sizes=\"auto, (max-width: 513px) 100vw, 513px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-6\">Mold Design and Thermal Management<\/h3>\n\n\n\n<p>Ceramic molds are standard in <a href=\"https:\/\/www.leierwocasting.com\/ar\/stainless-steel-castings\/\">\u0635\u0628 \u0627\u0644\u0627\u0633\u062a\u062b\u0645\u0627\u0631 \u0627\u0644\u0645\u0632\u062f\u0648\u062c \u0645\u0646 \u0627\u0644\u0641\u0648\u0644\u0627\u0630 \u0627\u0644\u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0635\u062f\u0623<\/a>. Uniform wall thickness in molds ensures even heat distribution. Uneven cooling can produce residual stresses, increasing porosity and causing microstructural inconsistencies.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Optimal mold thickness:<\/strong> 10\u201325 mm for medium-sized industrial components<\/li>\n\n\n\n<li><strong>Thermal expansion consideration:<\/strong> Allow 1\u20131.5% expansion to avoid mold cracking<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-7\">Pouring Temperature and Rate<\/h3>\n\n\n\n<p>Proper pouring temperature ensures complete filling while maintaining microstructural integrity:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Recommended temperature range: <strong>1450\u20131520\u00b0C<\/strong><\/li>\n\n\n\n<li>Pouring too hot \u2192 Oxidation, coarse grains<\/li>\n\n\n\n<li>Pouring too cold \u2192 Misruns, cold shuts<\/li>\n<\/ul>\n\n\n\n<p>A report from the ASM International highlights that <strong>variations of \u00b120\u00b0C can alter ferrite content by 5\u201310%, significantly affecting toughness<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-8\">Solidification and Cooling Rates<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rapid cooling \u2192 Increased ferrite content, reducing ductility<\/li>\n\n\n\n<li>Slow cooling \u2192 Formation of intermetallic compounds, lowering corrosion resistance<\/li>\n\n\n\n<li>Industrial best practice \u2192 Controlled cooling rate of <strong>15\u201325\u00b0C per minute for medium-thick sections<\/strong><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"undefined-9\">Design Considerations: Geometry, Wall Thickness, and Flow<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-10\">Wall Thickness Uniformity<\/h3>\n\n\n\n<p>Non-uniform wall thickness leads to differential cooling, resulting in shrinkage defects and warping. For duplex stainless steel:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Recommended maximum variation:<\/strong> \u00b120% for structural integrity<\/li>\n\n\n\n<li>Thicker sections may require risers to prevent shrinkage cavities<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-11\">Radii and Fillets<\/h3>\n\n\n\n<p>Sharp corners concentrate stress and increase the risk of cracks. Recommended fillet radii:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Small components: 2\u20134 mm<\/li>\n\n\n\n<li>Large components: 5\u201310 mm<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-12\">Gating, Runners, and Pouring Channels<\/h3>\n\n\n\n<p>Proper design of gating systems reduces turbulence, minimizes oxide inclusions, and ensures uniform flow. Computational Fluid Dynamics (CFD) simulations are increasingly used to <strong>optimize metal flow in complex geometries<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"undefined-13\">Heat Treatment and Post-Casting Processing<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"519\" height=\"491\" src=\"https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-20.png\" alt=\"\u0635\u0628 \u0627\u0644\u0627\u0633\u062a\u062b\u0645\u0627\u0631 \u0627\u0644\u0645\u0632\u062f\u0648\u062c \u0645\u0646 \u0627\u0644\u0641\u0648\u0644\u0627\u0630 \u0627\u0644\u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0635\u062f\u0623\" class=\"wp-image-3508\" style=\"width:500px\" srcset=\"https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-20.png 519w, https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-20-300x284.png 300w, https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-20-13x12.png 13w\" sizes=\"auto, (max-width: 519px) 100vw, 519px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-14\">Solution Annealing for Duplex Balance<\/h3>\n\n\n\n<p>Solution annealing ensures <strong>ferrite-austenite equilibrium<\/strong> and relieves internal stress:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Temperature: <strong>1020\u20131100\u00b0C<\/strong><\/li>\n\n\n\n<li>Duration: 30\u201360 minutes (depending on section thickness)<\/li>\n\n\n\n<li>Rapid water quenching recommended<\/li>\n<\/ul>\n\n\n\n<p>Post-annealing ensures high toughness, corrosion resistance, and dimensional stability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-15\">Stress Relief and Machining Considerations<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pre-machining stress relief minimizes distortion during cutting<\/li>\n\n\n\n<li>Recommended cutting speeds: 30\u201360 m\/min for SAF 2205<\/li>\n\n\n\n<li>Lubricants containing sulfur or chlorine must be avoided to prevent corrosion initiation<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"undefined-16\">Surface Quality and Inspection<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-17\">\u0627\u0644\u0627\u062e\u062a\u0628\u0627\u0631 \u063a\u064a\u0631 \u0627\u0644\u0645\u062f\u0645\u0631 (NDT)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>X-ray radiography:<\/strong> Detect internal voids or inclusions<\/li>\n\n\n\n<li><strong>Ultrasonic testing:<\/strong> Measure thickness and internal defects<\/li>\n\n\n\n<li><strong>Dye penetrant or magnetic particle testing:<\/strong> Surface crack detection<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"undefined-18\">Surface Finish and Passivation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ra \u2264 0.8 \u00b5m recommended for aggressive environments<\/li>\n\n\n\n<li>Passivation enhances long-term corrosion resistance<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"undefined-19\">Table: Typical <a href=\"https:\/\/www.leierwocasting.com\/ar\/stainless-steel-castings\/\">Duplex Stainless Steel Investment Casting<\/a> Specifications<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u0637\u0644\u0628<\/th><th>\u062f\u0631\u062c\u0629 \u0627\u0644\u0633\u0628\u064a\u0643\u0629<\/th><th>Wall Thickness (mm)<\/th><th>Pouring Temp (\u00b0C)<\/th><th>Annealing Temp (\u00b0C)<\/th><th>Max Size (mm)<\/th><th>\u0645\u0644\u062d\u0648\u0638\u0627\u062a<\/th><\/tr><\/thead><tbody><tr><td>Chemical valve body<\/td><td>SAF 2205<\/td><td>5\u201325<\/td><td>1480<\/td><td>1040<\/td><td>600<\/td><td>\u0645\u0642\u0627\u0648\u0645\u0629 \u0639\u0627\u0644\u064a\u0629 \u0644\u0644\u062a\u0622\u0643\u0644<\/td><\/tr><tr><td>Pump impeller<\/td><td>SAF 2507<\/td><td>3\u201320<\/td><td>1500<\/td><td>1050<\/td><td>400<\/td><td>Balanced microstructure<\/td><\/tr><tr><td>Marine propeller<\/td><td>SAF 2205<\/td><td>4\u201318<\/td><td>1475<\/td><td>1035<\/td><td>500<\/td><td>Smooth surface finish<\/td><\/tr><tr><td>Oil &amp; gas connector<\/td><td>SAF 2507<\/td><td>6\u201330<\/td><td>1510<\/td><td>1060<\/td><td>450<\/td><td>\u0642\u0648\u0629 \u0645\u064a\u0643\u0627\u0646\u064a\u0643\u064a\u0629 \u0639\u0627\u0644\u064a\u0629<\/td><\/tr><tr><td>Industrial valve housing<\/td><td>SAF 2205<\/td><td>5\u201325<\/td><td>1490<\/td><td>1045<\/td><td>700<\/td><td>Uniform wall thickness<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"undefined-20\">Advanced Considerations: Industrial Standards and Expert Opinions<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ASTM A923:<\/strong> Microstructural evaluation methods<\/li>\n\n\n\n<li><strong>ASTM A351\/A743:<\/strong> Casting grade specifications<\/li>\n\n\n\n<li>Dr. Richard Davis, a metallurgist at ISSF, states:<br><em>&#8220;Maintaining precise phase balance and controlling cooling rates are the most critical factors in duplex stainless steel investment casting quality.&#8221;<\/em><\/li>\n\n\n\n<li>European foundries increasingly adopt <strong>computer-aided mold design and real-time temperature monitoring<\/strong>, which reduces defects by up to 40%.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"undefined-21\">\u0627\u0644\u0639\u064a\u0648\u0628 \u0627\u0644\u0634\u0627\u0626\u0639\u0629 \u0648\u0643\u064a\u0641\u064a\u0629 \u0627\u0644\u0648\u0642\u0627\u064a\u0629 \u0645\u0646\u0647\u0627<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"514\" height=\"267\" src=\"https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-56.png\" alt=\"\u0635\u0628 \u0627\u0644\u0627\u0633\u062a\u062b\u0645\u0627\u0631 \u0627\u0644\u0645\u0632\u062f\u0648\u062c \u0645\u0646 \u0627\u0644\u0641\u0648\u0644\u0627\u0630 \u0627\u0644\u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0635\u062f\u0623\" class=\"wp-image-3509\" style=\"width:500px\" srcset=\"https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-56.png 514w, https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-56-300x156.png 300w, https:\/\/www.leierwocasting.com\/wp-content\/uploads\/2026\/02\/screenshot_2026-02-03_10-15-56-18x9.png 18w\" sizes=\"auto, (max-width: 514px) 100vw, 514px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Porosity \u2192 Controlled pouring temperature and degassing<\/li>\n\n\n\n<li>Cracks \u2192 Proper fillet radii, solution annealing<\/li>\n\n\n\n<li>Segregation \u2192 Uniform wall thickness, optimized gating<\/li>\n\n\n\n<li>Intermetallic formation \u2192 Controlled cooling, correct heat treatment<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"undefined-22\">\u062e\u0627\u062a\u0645\u0629<\/h2>\n\n\n\n<p>\u062c\u0648\u062f\u0629 \u0639\u0627\u0644\u064a\u0629 <strong><a href=\"https:\/\/www.leierwocasting.com\/ar\/stainless-steel-castings\/\">\u0635\u0628 \u0627\u0644\u0627\u0633\u062a\u062b\u0645\u0627\u0631 \u0627\u0644\u0645\u0632\u062f\u0648\u062c \u0645\u0646 \u0627\u0644\u0641\u0648\u0644\u0627\u0630 \u0627\u0644\u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0635\u062f\u0623<\/a><\/strong> requires:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Selecting proper alloy grades and certified suppliers<\/li>\n\n\n\n<li>Maintaining precise pouring temperature and mold design<\/li>\n\n\n\n<li>Designing uniform wall thickness and fillets<\/li>\n\n\n\n<li>Performing solution annealing and stress relief<\/li>\n\n\n\n<li>Conducting thorough NDT inspection and surface finishing<\/li>\n<\/ol>\n\n\n\n<p>By addressing these five factors, manufacturers and buyers can <strong>ensure durable, corrosion-resistant, and precise components<\/strong> while reducing maintenance costs and extending service life.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"undefined-23\">\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-are-the-most-critical-duplex-stainless-steel-grades-for-casting\">What are the most critical duplex stainless steel grades for casting?<\/h3>\n\n\n\n<p>SAF 2205 and SAF 2507 are commonly used due to their balance of corrosion resistance and mechanical strength.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"why-is-phase-balance-important\">Why is phase balance important?<\/h2>\n\n\n\n<p>Incorrect ferrite\/austenite ratio can reduce toughness and corrosion resistance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-wall-thickness-variations-affect-quality\">How do wall thickness variations affect quality?<\/h3>\n\n\n\n<p>Non-uniform walls can cause shrinkage, porosity, or warping.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-are-the-typical-defects-in-duplex-stainless-steel-casting\">What are the typical defects in <a href=\"https:\/\/www.leierwocasting.com\/ar\/stainless-steel-castings\/\">duplex stainless steel casting<\/a>?<\/h3>\n\n\n\n<p>Porosity, cracks, segregation, and intermetallic phases.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-heat-treatment-is-recommended\">What heat treatment is recommended?<\/h3>\n\n\n\n<p>Solution annealing at 1020\u20131100\u00b0C with water quenching is standard.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"can-cfd-simulations-help-in-casting-design\">Can CFD simulations help in casting design?<\/h3>\n\n\n\n<p>Yes, they optimize metal flow and reduce turbulence-induced defects.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-often-should-ndt-inspections-be-performed\">How often should NDT inspections be performed?<\/h3>\n\n\n\n<p>Every critical component should undergo at least one full inspection before machining and surface finishing.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>\u0627\u0643\u062a\u0634\u0641 5 \u0639\u0648\u0627\u0645\u0644 \u0631\u0626\u064a\u0633\u064a\u0629 \u062a\u0636\u0645\u0646 \u0635\u0628 \u0627\u0633\u062a\u062b\u0645\u0627\u0631 \u0627\u0644\u0641\u0648\u0644\u0627\u0630 \u0627\u0644\u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0635\u062f\u0623 \u0627\u0644\u0645\u0632\u062f\u0648\u062c \u0639\u0627\u0644\u064a \u0627\u0644\u062c\u0648\u062f\u0629 \u0644\u0644\u062d\u0635\u0648\u0644 \u0639\u0644\u0649 \u0645\u0643\u0648\u0646\u0627\u062a \u0635\u0646\u0627\u0639\u064a\u0629 \u0645\u062a\u064a\u0646\u0629 \u0648\u0645\u0642\u0627\u0648\u0645\u0629 \u0644\u0644\u062a\u0622\u0643\u0644.<\/p>","protected":false},"author":1,"featured_media":3508,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[32],"tags":[],"class_list":["post-3503","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/www.leierwocasting.com\/ar\/wp-json\/wp\/v2\/posts\/3503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.leierwocasting.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.leierwocasting.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.leierwocasting.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.leierwocasting.com\/ar\/wp-json\/wp\/v2\/comments?post=3503"}],"version-history":[{"count":2,"href":"https:\/\/www.leierwocasting.com\/ar\/wp-json\/wp\/v2\/posts\/3503\/revisions"}],"predecessor-version":[{"id":3512,"href":"https:\/\/www.leierwocasting.com\/ar\/wp-json\/wp\/v2\/posts\/3503\/revisions\/3512"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.leierwocasting.com\/ar\/wp-json\/wp\/v2\/media\/3508"}],"wp:attachment":[{"href":"https:\/\/www.leierwocasting.com\/ar\/wp-json\/wp\/v2\/media?parent=3503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.leierwocasting.com\/ar\/wp-json\/wp\/v2\/categories?post=3503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.leierwocasting.com\/ar\/wp-json\/wp\/v2\/tags?post=3503"}],"curies":[{"name":"\u0648\u0648\u0631\u062f\u0628\u0631\u064a\u0633","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}