{"id":2892,"date":"2026-07-07T08:17:07","date_gmt":"2026-07-07T06:17:07","guid":{"rendered":"https:\/\/www.fries-gmbh.de\/knowledge\/machining-stainless-steel\/"},"modified":"2026-07-07T13:53:03","modified_gmt":"2026-07-07T11:53:03","slug":"machining-stainless-steel","status":"publish","type":"page","link":"https:\/\/www.fries-gmbh.de\/en\/knowledge\/machining-stainless-steel\/","title":{"rendered":"Machining Stainless Steel: Work Hardening, Heat and the Right Strategy"},"content":{"rendered":"<p class=\"fw-zurueck\"><a href=\"https:\/\/www.fries-gmbh.de\/en\/knowledge\/\">\u2190 Back to the knowledge base<\/a><\/p>\n<article class=\"fw-artikel\">\n<header class=\"fw-kopf\">\n<p class=\"fw-kicker\">Knowledge \u00b7 CNC machining<\/p>\n<aside class=\"fw-kurzantwort\">\n<p><strong>In short:<\/strong> Austenitic stainless steels such as 1.4301 or 1.4571 are tough, conduct heat poorly and harden under the cutting edge. Machined like structural steel, they produce heat build-up, burrs and rapid tool wear. The counter-strategy is always the same: sharp tools, sufficient feed instead of timid cuts, rigid clamping and consistent cooling. Then tight tolerances and clean surfaces are economical on stainless too.<\/p>\n<\/aside>\n<\/header>\n<div class=\"fw-inhalt\">\n<h2>What makes stainless steel demanding to machine?<\/h2>\n<p>Three properties combine. <strong>Work hardening<\/strong>: austenite hardens under plastic deformation; every cut leaves a thin hardened layer, and whoever rubs instead of cutting works permanently in that layer and wears the edge in fast motion. <strong>Poor thermal conductivity<\/strong>: only about a third of structural steel, so heat stays at the cutting zone instead of flowing away. <strong>Toughness<\/strong>: long stringy chips that wrap around tool and part, and stubborn burrs on edges and hole exits.<\/p>\n<h2>What does the right strategy look like?<\/h2>\n<p>It follows one principle: <strong>cut, do not rub<\/strong>. Sharp tools with positive geometry and wear-resistant coating (AlTiN types), moderate cutting speed (orientation: 100 to 180 m\/min when milling 1.4301 with solid carbide, well below structural steel), but consistently sufficient feed so the edge dives below the hardened zone of the previous cut. Add a rigid machine and clamping, because stainless answers vibration with edge chipping, plus generous coolant right at the cutting zone. When drilling: continuous feed without dwelling, or the hole bottom hardens and punishes the next tool.<\/p>\n<h2>How do the stainless grades machine?<\/h2>\n<table>\n<thead>\n<tr>\n<th>Material<\/th>\n<th>Machinability<\/th>\n<th>Practical note<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1.4301 (304)<\/td>\n<td>medium<\/td>\n<td>standard case; mind work hardening<\/td>\n<\/tr>\n<tr>\n<td>1.4404 \/ 1.4571 (316 types)<\/td>\n<td>medium, slightly tougher<\/td>\n<td>more heat, stability matters<\/td>\n<\/tr>\n<tr>\n<td>1.4305 (free machining)<\/td>\n<td>good<\/td>\n<td>sulphur-alloyed for turned parts; limited weldability and corrosion resistance<\/td>\n<\/tr>\n<tr>\n<td>Duplex (1.4462)<\/td>\n<td>difficult<\/td>\n<td>high strength plus toughness; reduced data, best rigidity required<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>A practical tip for designers: if a turned part is neither welded nor exposed to demanding media, consider 1.4305 instead of 1.4301; the free-machining grade cuts machining time noticeably. Conversely, parts that will be welded must not be 1.4305, whose sulphur makes seams crack-prone.<\/p>\n<h2>What about surfaces, burrs and downstream processes?<\/h2>\n<p>Stainless parts need a planned edge strategy: burrs are tougher than on structural steel and must be removed explicitly at functional edges (specify &#8220;edges burr-free&#8221; with radius or chamfer on the drawing). For visible faces agree the finish: ground with defined grit, brushed or as milled. And when the part joins a welded assembly, the rules from <a href=\"https:\/\/www.fries-gmbh.de\/en\/knowledge\/welding-stainless-steel\/\">welding stainless steel<\/a> apply: separate tool worlds for steel and stainless so no rust film appears, in machining just as in the weld shop.<\/p>\n<\/div>\n<section class=\"fw-faq\">\n<h2>Frequently asked questions<\/h2>\n<details class=\"fw-faq-item\">\n<summary class=\"fw-faq-frage\">Why is stainless steel harder to machine than structural steel?<\/summary>\n<div class=\"fw-faq-antwort\">\n<p>Because of the combination of work hardening, poor heat conduction and toughness. Heat stays at the edge, the surface layer hardens and chips are long and tough. Sharp tools, sufficient feed and good cooling keep it well manageable.<\/p>\n<\/div>\n<\/details>\n<details class=\"fw-faq-item\">\n<summary class=\"fw-faq-frage\">What is work hardening?<\/summary>\n<div class=\"fw-faq-antwort\">\n<p>The hardening of the austenitic structure under plastic deformation. Every cut leaves a hardened layer; too little feed or dwelling tools amplify the effect and ruin tool life.<\/p>\n<\/div>\n<\/details>\n<details class=\"fw-faq-item\">\n<summary class=\"fw-faq-frage\">Which cutting data apply to 1.4301?<\/summary>\n<div class=\"fw-faq-antwort\">\n<p>As orientation, 100 to 180 m\/min for solid-carbide milling with a solid feed per tooth; exact values depend on tool, machine and part. More important than the exact number is the principle: cut, do not rub.<\/p>\n<\/div>\n<\/details>\n<details class=\"fw-faq-item\">\n<summary class=\"fw-faq-frage\">Can the same company machine and weld stainless?<\/summary>\n<div class=\"fw-faq-antwort\">\n<p>Yes, and for assemblies that is the best solution, provided steel and stainless are cleanly separated in the shop. Then machining, welding and seam treatment come from one source without interface losses.<\/p>\n<\/div>\n<\/details>\n<\/section>\n<footer class=\"fw-cta\">\n<p>Fries Maschinen- und Anlagenbau machines stainless parts from one-offs to series and builds complete stainless assemblies including welding and seam treatment. More at <a href=\"https:\/\/www.fries-gmbh.de\/en\/cnc-machining\/\">CNC machining at Fries<\/a>.<\/p>\n<\/footer>\n<\/article>\n<p class=\"fw-zurueck\"><a href=\"https:\/\/www.fries-gmbh.de\/en\/knowledge\/\">\u2190 Back to the knowledge base<\/a><\/p>\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"headline\":\"Machining Stainless Steel: Work Hardening, Heat and the Right Strategy\",\"description\":\"Why stainless steel is demanding to mill and turn: work hardening, heat build-up, tough chips, and the tooling strategy that still makes it economical.\",\"inLanguage\":\"en\",\"author\":{\"@type\":\"Person\",\"name\":\"Mika Fries\",\"url\":\"https:\/\/www.fries-gmbh.de\/en\/company\/\"},\"publisher\":{\"@type\":\"Organization\",\"name\":\"Fries Maschinen- und Anlagenbau GmbH\",\"logo\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/www.fries-gmbh.de\/wp-content\/uploads\/2022\/02\/Fries-Logo-weiss-1-e1648995713371.png\"}},\"datePublished\":\"2026-07-07\",\"dateModified\":\"2026-07-07\",\"mainEntityOfPage\":\"https:\/\/www.fries-gmbh.de\/en\/knowledge\/machining-stainless-steel\/\"},{\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Why is stainless steel harder to machine than structural steel?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Because of the combination of work hardening, poor heat conduction and toughness. 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