{"id":3114,"date":"2026-10-30T15:20:20","date_gmt":"2026-10-30T09:50:20","guid":{"rendered":"https:\/\/www.ambicasteels.com\/blog\/?p=3114"},"modified":"2026-10-30T15:38:23","modified_gmt":"2026-10-30T10:08:23","slug":"300-and-400-series-stainless-steel-grades-how-to-choose-the-right-one","status":"publish","type":"post","link":"https:\/\/www.ambicasteels.com\/blog\/300-and-400-series-stainless-steel-grades-how-to-choose-the-right-one\/","title":{"rendered":"300 and 400 Series Stainless Steel Grades: How to Choose the Right One"},"content":{"rendered":"<p><strong>Quick answer:<\/strong> The 300 series is austenitic chromium-nickel stainless steel (grades such as 304, 316 and 310). It offers the best corrosion resistance, excellent formability and weldability, and is non-magnetic when annealed. The 400 series is ferritic or martensitic chromium stainless steel (grades such as 430, 410 and 420) with little or no nickel. It is magnetic, costs less, and the martensitic grades can be heat treated for high hardness and wear resistance.<\/p>\n<h2>Key Takeaways<\/h2>\n<ul>\n<li>Pick the <strong>300 series<\/strong> when corrosion resistance, hygiene, formability or welding come first.<\/li>\n<li>Pick the <strong>400 series<\/strong> when hardness, wear resistance, magnetic response or lower cost come first.<\/li>\n<li>Pick <strong>316<\/strong> over 304 for chlorides, marine exposure and chemical processing.<\/li>\n<li>Pick <strong>410, 416 or 420<\/strong> for shafts, valve parts and cutting edges that must be heat treated.<\/li>\n<li>Do not identify a grade with a magnet. Cold-worked 300 series grades can attract one.<\/li>\n<\/ul>\n<h2>What Is the 300 Series of Stainless Steel?<\/h2>\n<p>The 300 series is the <a href=\"https:\/\/ambicasteels.com\/stainless-steel-grades\/austenitic-stainless-steels\/\">austenitic stainless steel<\/a> family. Its face-centred cubic structure comes from nickel (and, in some grades, nitrogen), which keeps the steel tough and ductile at both low and high temperatures. Typical compositions run from about 16% to 26% chromium and 6% to 22% nickel. Grade 316 adds roughly 2-3% molybdenum for pitting resistance.<\/p>\n<p>These grades are not hardenable by heat treatment. They gain strength only through cold working. The most common grades are:<\/p>\n<ul>\n<li><strong>304 \/ 304L:<\/strong> the general-purpose grade for food, beverage, architectural and chemical equipment. See our <a href=\"https:\/\/ambicasteels.com\/304-304l-stainless-steel-stock\/\">304\/304L stainless steel<\/a> and <a href=\"https:\/\/www.ambicasteels.com\/sae-304-stainless-steel\">SAE 304<\/a> pages.<\/li>\n<li><strong>316 \/ 316L:<\/strong> molybdenum-bearing grade for marine, pharmaceutical and chloride-rich service.<\/li>\n<li><strong>321 and 347:<\/strong> stabilised grades for welded parts exposed to 425-850\u00b0C.<\/li>\n<li><strong>310 \/ 309:<\/strong> high-chromium, high-nickel grades for furnace parts and oxidation resistance.<\/li>\n<\/ul>\n<h2>What Is the 400 Series of Stainless Steel?<\/h2>\n<p>The 400 series covers two families. <strong>Ferritic<\/strong> grades (409, 430, 439) hold a body-centred cubic structure and cannot be hardened by heat treatment. <a href=\"https:\/\/ambicasteels.com\/martensitic-stainless-steels\/\">Martensitic stainless steels<\/a> (410, 416, 420, 440C) contain more carbon and can be hardened by quenching and tempering. Chromium typically ranges from about 11% to 18%, with minimal nickel.<\/p>\n<ul>\n<li><strong>410:<\/strong> general-purpose martensitic grade for pump shafts, fasteners and valve trim. See our <a href=\"https:\/\/ambicasteels.com\/stainless-steel-410\/\">stainless steel 410<\/a> page.<\/li>\n<li><strong>403:<\/strong> a refined 410 variant used for turbine blades and highly stressed parts. See <a href=\"https:\/\/ambicasteels.com\/stainless-steel-403\">stainless steel 403<\/a>.<\/li>\n<li><strong>416:<\/strong> free-machining martensitic grade for screw-machine parts.<\/li>\n<li><strong>420:<\/strong> higher-carbon grade for cutlery, surgical instruments and moulds.<\/li>\n<li><strong>430:<\/strong> ferritic grade for appliance panels, decorative trim and kitchen equipment.<\/li>\n<\/ul>\n<h2>300 Series vs 400 Series: Side-by-Side Comparison<\/h2>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr>\n<th>Property<\/th>\n<th>300 Series (Austenitic)<\/th>\n<th>400 Series (Ferritic \/ Martensitic)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Main alloying elements<\/td>\n<td>Chromium, nickel, sometimes molybdenum<\/td>\n<td>Chromium, carbon; little or no nickel<\/td>\n<\/tr>\n<tr>\n<td>Corrosion resistance<\/td>\n<td>High to excellent<\/td>\n<td>Moderate (ferritic) to limited (martensitic)<\/td>\n<\/tr>\n<tr>\n<td>Magnetic<\/td>\n<td>No when annealed; slight when cold worked<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Heat-treat hardenable<\/td>\n<td>No<\/td>\n<td>Martensitic: yes. Ferritic: no<\/td>\n<\/tr>\n<tr>\n<td>Formability<\/td>\n<td>Excellent, very ductile<\/td>\n<td>Fair to good (ferritic); limited (martensitic)<\/td>\n<\/tr>\n<tr>\n<td>Weldability<\/td>\n<td>Excellent<\/td>\n<td>Limited; martensitic grades need preheat and post-weld heat treatment<\/td>\n<\/tr>\n<tr>\n<td>Hardness and wear resistance<\/td>\n<td>Lower<\/td>\n<td>Higher in martensitic grades<\/td>\n<\/tr>\n<tr>\n<td>Chloride stress corrosion cracking<\/td>\n<td>Susceptible at elevated temperature under tensile stress<\/td>\n<td>Ferritic grades are highly resistant<\/td>\n<\/tr>\n<tr>\n<td>Thermal expansion<\/td>\n<td>Higher<\/td>\n<td>Lower<\/td>\n<\/tr>\n<tr>\n<td>Cost<\/td>\n<td>Higher (nickel content)<\/td>\n<td>Lower and steadier<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Corrosion Resistance<\/h2>\n<p>Chromium forms the passive oxide layer that makes steel \u201cstainless\u201d, and nickel and molybdenum make that layer more stable. A rough guide is the Pitting Resistance Equivalent Number (PREN): about 19-20 for 304, about 24 for 316, about 16-17 for 430 and about 12 for 410. A higher PREN means better pitting resistance in chloride environments. Martensitic grades can rust in humid or salt-laden air unless the surface is clean, polished and passivated.<\/p>\n<h2>Strength, Hardness and Heat Treatment<\/h2>\n<p>Annealed 300 series grades are tough and ductile but relatively soft. Martensitic 400 series grades can be hardened to much higher levels. Grade 420 reaches roughly 50 HRC, and 440C approaches about 58-60 HRC, which is why these grades suit blades, bearings and wear parts. Ferritic grades such as 430 stay at moderate strength and cannot be hardened by heat treatment.<\/p>\n<h2>Magnetism: A Myth Worth Clearing Up<\/h2>\n<p>All 400 series grades are magnetic. Annealed 300 series grades are not, but cold drawing, bending or machining can introduce a weak magnetic response in 304. A magnet test therefore cannot confirm a grade. Request a mill test certificate or positive material identification (PMI) instead.<\/p>\n<h2>Cost: Why 400 Series Is Cheaper<\/h2>\n<p>Nickel drives the price gap. 300 series grades carry roughly 8-14% nickel, and some carry more, while 400 series grades carry little or none. Nickel prices also swing more than chromium or iron prices, so 400 series quotations tend to be steadier. The cheapest grade is not always the lowest-cost choice, though. A 410 part that corrodes in service costs more than a 304 part that lasts.<\/p>\n<h2>How to Choose: 300 Series or 400 Series?<\/h2>\n<h3>Choose the 300 series if your application needs:<\/h3>\n<ul>\n<li>Corrosion resistance in water, food, chemicals or outdoor exposure<\/li>\n<li>Hygienic, easy-to-clean surfaces (food, dairy, pharma)<\/li>\n<li>Deep drawing, bending or complex forming<\/li>\n<li>Welded assemblies without post-weld heat treatment<\/li>\n<li>Non-magnetic behaviour or toughness at cryogenic temperatures<\/li>\n<\/ul>\n<h3>Choose the 400 series if your application needs:<\/h3>\n<ul>\n<li>High hardness, wear resistance or an edge that holds (410, 420, 440C)<\/li>\n<li>Free machining at volume (416)<\/li>\n<li>Resistance to chloride stress corrosion cracking at low cost (430)<\/li>\n<li>Magnetic response, such as solenoid or sensor parts<\/li>\n<li>A lower-cost grade for mild environments such as appliance trim and exhaust components<\/li>\n<\/ul>\n<h2>Common Mistakes Buyers Make<\/h2>\n<ul>\n<li><strong>Specifying 304 where 316 is needed.<\/strong> Coastal, de-icing salt and chloride cleaning environments often cause pitting in 304.<\/li>\n<li><strong>Using 410 or 420 for outdoor parts without protection.<\/strong> Without passivation or coating, these grades can show surface rust.<\/li>\n<li><strong>Welding martensitic grades like austenitic ones.<\/strong> Without preheat and tempering, hardened weld zones can crack.<\/li>\n<li><strong>Relying on a magnet test.<\/strong> Always check the mill certificate against the ASTM, EN or JIS standard.<\/li>\n<li><strong>Ignoring the delivery condition.<\/strong> Annealed, hardened and tempered, cold drawn and bright finishes behave differently in machining and service.<\/li>\n<\/ul>\n<h2>Sourcing 300 and 400 Series Grades from Ambica Steels<\/h2>\n<p>Ambica Steels Limited has manufactured and exported stainless steel since 1970. We operate from our New Delhi headquarters, run a warehouse in Maastricht, the Netherlands, and supply customers in more than 75 countries.\u00a0Our quality systems are certified to ISO 9001:2015, IATF 16949:2016 and EN 9100:2018. Procurement managers, engineers and distributors can request 300 and 400 series grades in bar and billet forms, with mill test certificates and grade-specific guidance.<\/p>\n<p>To compare grades for your application or to request a quotation, email <a href=\"mailto:dm@ambicasteels.com\">dm@ambicasteels.com<\/a> or call +91 (11) 47034400.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<h3>What is the main difference between 300 and 400 series stainless steel?<\/h3>\n<p>The 300 series is austenitic chromium-nickel stainless steel with higher corrosion resistance, excellent formability and good weldability. The 400 series is ferritic or martensitic chromium stainless steel with little or no nickel. It is magnetic, lower in cost and, in martensitic grades, hardenable by heat treatment.<\/p>\n<h3>Is 304 stainless steel a 300 series grade?<\/h3>\n<p>Yes. Grade 304 is the most widely used 300 series (austenitic) stainless steel. It contains about 18-20% chromium and 8-10.5% nickel, and is non-magnetic in the annealed condition.<\/p>\n<h3>Is 400 series stainless steel magnetic?<\/h3>\n<p>Yes. Both ferritic grades (such as 430) and martensitic grades (such as 410 and 420) are magnetic. Annealed 300 series grades are non-magnetic, although cold working can make them slightly magnetic.<\/p>\n<h3>Which is better for corrosion resistance, 300 or 400 series?<\/h3>\n<p>The 300 series performs better in most environments. Grade 316, which contains molybdenum, is the preferred choice for chloride-rich and marine conditions. Ferritic 400 series grades such as 430 give moderate resistance, and martensitic grades such as 410 give the lowest.<\/p>\n<h3>Can 400 series stainless steel be hardened?<\/h3>\n<p>Martensitic 400 series grades (410, 416, 420, 440C) can be hardened by heat treatment. Ferritic grades such as 430 cannot. 300 series grades cannot be hardened by heat treatment and gain strength only through cold working.<\/p>\n<h3>Why is the 300 series more expensive than the 400 series?<\/h3>\n<p>The main reason is nickel. 300 series grades contain roughly 8-14% nickel (more in grades such as 310), while 400 series grades contain little or none. Nickel prices also move more sharply than chromium or iron, so 400 series pricing is usually steadier.<\/p>\n<h3>Which series should I choose for shafts, valves and cutlery?<\/h3>\n<p>Choose martensitic 400 series grades such as 410, 416 or 420 when hardness, wear resistance and strength matter more than maximum corrosion resistance. Choose 304 or 316 when the part will see moisture, chemicals, salt or frequent cleaning.<\/p>\n<h2>Related Reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.ambicasteels.com\/blog\/300-series-vs-400-series-of-stainless-steel\/\">Difference Between 300 Series and 400 Series of Stainless Steel<\/a><\/li>\n<li><a href=\"https:\/\/www.ambicasteels.com\/blog\/200-300-and-400-series-of-stainless-steel-and-grading-system\/\">200, 300, and 400 Series of Stainless Steel and Grading System<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Quick answer: The 300 series is austenitic chromium-nickel stainless steel (grades such as 304, 316 and 310). It offers the best corrosion resistance, excellent formability and weldability, and is non-magnetic when annealed. The 400 series is ferritic or martensitic chromium&#8230; <\/p>\n","protected":false},"author":2,"featured_media":3117,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[140],"tags":[],"class_list":["post-3114","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stainless-steel-bars"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"Compare 300 and 400 series stainless steel grades: composition, corrosion, magnetism, strength, cost and best uses. 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