{"id":2014,"date":"2025-03-04T00:23:06","date_gmt":"2025-03-03T18:53:06","guid":{"rendered":"https:\/\/metatechx.in\/?p=2014"},"modified":"2025-03-04T00:23:08","modified_gmt":"2025-03-03T18:53:08","slug":"effect-of-increased-sulphur-in-en24-grade-steel","status":"publish","type":"post","link":"https:\/\/metatechx.in\/index\/effect-of-increased-sulphur-in-en24-grade-steel\/","title":{"rendered":"Effect of Increased Sulphur in EN24 grade steel"},"content":{"rendered":"\n<p>EN24 is a high-strength, low-alloy steel (equivalent to 4340) known for its toughness, wear resistance, and good mechanical properties. It typically contains <strong>0.35\u20130.45% Carbon, 1.3\u20131.8% Nickel, 0.45\u20130.7% Chromium, 0.2\u20130.35% Molybdenum<\/strong>, and very low Sulphur (S) and Phosphorus (P) levels (usually below 0.04%).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Effect of Increased Sulphur in EN24:<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Reduced Toughness &amp; Impact Strength:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Sulphur forms manganese sulfide (MnS) inclusions, which act as stress concentration points, leading to brittleness.<\/li>\n\n\n\n<li>This is especially detrimental to impact-loaded applications like shafts and gears.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Improved Machinability (Up to a Limit):<\/strong>\n<ul class=\"wp-block-list\">\n<li>MnS inclusions help break chips during machining, improving surface finish and tool life.<\/li>\n\n\n\n<li>However, excessive Sulphur (>0.06%) can lead to reduced mechanical strength.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Lower Ductility &amp; Fatigue Resistance:<\/strong>\n<ul class=\"wp-block-list\">\n<li>The MnS inclusions create weak points that can initiate cracks under cyclic loading, reducing fatigue strength.<\/li>\n\n\n\n<li>This is problematic for aerospace and automotive applications where fatigue life is critical.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Compromised Weldability:<\/strong>\n<ul class=\"wp-block-list\">\n<li>High Sulphur increases the risk of hot cracking during welding, making EN24 difficult to weld without preheating and post-weld treatments.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Reduced Corrosion Resistance:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Sulphur-rich inclusions can lead to localized corrosion, especially in humid or marine environments.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Recommended Sulphur Content:<\/h3>\n\n\n\n<p>For general applications, Sulphur is kept below <strong>0.04%<\/strong> in EN24. In free-machining variants, Sulphur may be increased to <strong>0.08\u20130.15%<\/strong>, but this compromises strength and toughness.<\/p>\n\n\n\n<p><strong>Comparison of standard EN24 vs. free-machining EN24 (EN24S)<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Comparison: Standard EN24 vs. Free-Machining EN24 (EN24S)<\/strong><\/h3>\n\n\n\n<p>EN24 is a high-strength alloy steel used in aerospace, automotive, and industrial applications. EN24S is a free-machining variant with higher Sulphur content to improve machinability. Below is a detailed comparison:<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Chemical Composition<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Element<\/th><th>Standard EN24<\/th><th>Free-Machining EN24S<\/th><\/tr><\/thead><tbody><tr><td>Carbon (C)<\/td><td>0.35\u20130.45%<\/td><td>0.35\u20130.45%<\/td><\/tr><tr><td>Silicon (Si)<\/td><td>0.10\u20130.35%<\/td><td>0.10\u20130.35%<\/td><\/tr><tr><td>Manganese (Mn)<\/td><td>0.45\u20130.70%<\/td><td>0.45\u20130.70%<\/td><\/tr><tr><td>Chromium (Cr)<\/td><td>1.00\u20131.40%<\/td><td>1.00\u20131.40%<\/td><\/tr><tr><td>Molybdenum (Mo)<\/td><td>0.20\u20130.35%<\/td><td>0.20\u20130.35%<\/td><\/tr><tr><td>Nickel (Ni)<\/td><td>1.30\u20131.80%<\/td><td>1.30\u20131.80%<\/td><\/tr><tr><td>Sulphur (S)<\/td><td><strong>\u22640.04%<\/strong><\/td><td><strong>0.08\u20130.15%<\/strong><\/td><\/tr><tr><td>Phosphorus (P)<\/td><td>\u22640.035%<\/td><td>\u22640.035%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Key Difference:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>EN24S has higher <strong>Sulphur (S) content (0.08\u20130.15%)<\/strong>, leading to better machinability but lower mechanical properties.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Mechanical Properties (After Heat Treatment, Typical Values)<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Property<\/th><th>Standard EN24 (T)<\/th><th>Free-Machining EN24S (T)<\/th><\/tr><\/thead><tbody><tr><td>Tensile Strength (MPa)<\/td><td>850\u20131000<\/td><td>750\u2013900<\/td><\/tr><tr><td>Yield Strength (MPa)<\/td><td>650\u2013800<\/td><td>550\u2013700<\/td><\/tr><tr><td>Elongation (%)<\/td><td>13\u201316<\/td><td>10\u201314<\/td><\/tr><tr><td>Impact Strength (Charpy V)<\/td><td>High<\/td><td>Lower<\/td><\/tr><tr><td>Hardness (HRC)<\/td><td>28\u201336<\/td><td>25\u201332<\/td><\/tr><tr><td>Fatigue Strength<\/td><td>High<\/td><td>Lower<\/td><\/tr><tr><td>Machinability<\/td><td>Moderate<\/td><td><strong>High (due to MnS inclusions)<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Key Differences:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>EN24S has lower strength, hardness, and impact resistance.<\/strong><\/li>\n\n\n\n<li><strong>EN24S has better machinability due to MnS inclusions.<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Applications<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Application<\/th><th>Standard EN24<\/th><th>Free-Machining EN24S<\/th><\/tr><\/thead><tbody><tr><td>High-Strength Shafts &amp; Gears<\/td><td>\u2705 Preferred<\/td><td>\u274c Not Recommended<\/td><\/tr><tr><td>Automotive Crankshafts &amp; Axles<\/td><td>\u2705 Best Choice<\/td><td>\u274c Lower Fatigue Life<\/td><\/tr><tr><td>Aerospace Components<\/td><td>\u2705 Used<\/td><td>\u274c Rarely Used<\/td><\/tr><tr><td>High-Stress Bolts &amp; Fasteners<\/td><td>\u2705 Common<\/td><td>\u274c Weaker<\/td><\/tr><tr><td>Free-Machining Parts (Threads, Fittings)<\/td><td>\u274c Harder to Machine<\/td><td>\u2705 Easier to Machine<\/td><\/tr><tr><td>Welded Structures<\/td><td>\u2705 Possible (with preheat)<\/td><td>\u274c High Sulphur = Hot Cracking<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Key Differences:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>EN24 is used where high strength &amp; fatigue resistance are needed.<\/strong><\/li>\n\n\n\n<li><strong>EN24S is used for applications where machinability is more important than toughness.<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Pros &amp; Cons<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Factor<\/th><th>Standard EN24<\/th><th>Free-Machining EN24S<\/th><\/tr><\/thead><tbody><tr><td><strong>Machinability<\/strong><\/td><td>Moderate<\/td><td><strong>High (Easier to machine)<\/strong><\/td><\/tr><tr><td><strong>Toughness &amp; Impact Strength<\/strong><\/td><td><strong>High<\/strong><\/td><td>Lower<\/td><\/tr><tr><td><strong>Fatigue Resistance<\/strong><\/td><td><strong>High<\/strong><\/td><td>Lower<\/td><\/tr><tr><td><strong>Weldability<\/strong><\/td><td>Moderate (Preheat needed)<\/td><td><strong>Poor (Hot Cracking)<\/strong><\/td><\/tr><tr><td><strong>Strength &amp; Hardness<\/strong><\/td><td><strong>Higher<\/strong><\/td><td>Lower<\/td><\/tr><tr><td><strong>Chip Breaking (During Machining)<\/strong><\/td><td>Long, Continuous<\/td><td><strong>Short, Easy to Remove<\/strong><\/td><\/tr><tr><td><strong>Surface Finish (After Machining)<\/strong><\/td><td>Moderate<\/td><td><strong>Better Finish<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Conclusion: Which One to Choose?<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Choose Standard EN24<\/strong> if you need high strength, impact resistance, and fatigue strength (e.g., aerospace, heavy-duty shafts, automotive axles).<\/li>\n\n\n\n<li><strong>Choose EN24S (Free-Machining EN24)<\/strong> if machinability is a priority and strength is less critical (e.g., fasteners, general machining parts).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Details on heat treatment effects for both grades<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Heat Treatment Effects on EN24 vs. EN24S<\/strong><\/h3>\n\n\n\n<p>Heat treatment significantly affects the mechanical properties of EN24 and EN24S. Below is a detailed breakdown of the heat treatment processes and their effects on both grades.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. Common Heat Treatment Processes<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Heat Treatment Process<\/th><th>Purpose<\/th><\/tr><\/thead><tbody><tr><td><strong>Annealing<\/strong><\/td><td>Softens the material for machining, improves ductility.<\/td><\/tr><tr><td><strong>Normalizing<\/strong><\/td><td>Refines grain structure, improves strength &amp; toughness.<\/td><\/tr><tr><td><strong>Hardening (Quenching)<\/strong><\/td><td>Increases hardness and strength by rapid cooling.<\/td><\/tr><tr><td><strong>Tempering<\/strong><\/td><td>Reduces brittleness, balances strength &amp; toughness.<\/td><\/tr><tr><td><strong>Case Hardening (Nitriding\/Carburizing)<\/strong><\/td><td>Improves surface hardness for wear resistance.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. Heat Treatment Comparison: EN24 vs. EN24S<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Process<\/th><th>Standard EN24<\/th><th>Free-Machining EN24S<\/th><\/tr><\/thead><tbody><tr><td><strong>Annealing (Softening)<\/strong><\/td><td>830\u2013850\u00b0C \u2192 Furnace Cool<\/td><td>830\u2013850\u00b0C \u2192 Furnace Cool<\/td><\/tr><tr><td><strong>Normalized Condition<\/strong><\/td><td>850\u2013880\u00b0C \u2192 Air Cool<\/td><td>850\u2013880\u00b0C \u2192 Air Cool<\/td><\/tr><tr><td><strong>Hardening (Quenching)<\/strong><\/td><td><strong>820\u2013850\u00b0C \u2192 Oil Quench<\/strong><\/td><td><strong>820\u2013850\u00b0C \u2192 Oil Quench<\/strong><\/td><\/tr><tr><td><strong>Tempering<\/strong><\/td><td>400\u2013650\u00b0C \u2192 Air Cool<\/td><td>400\u2013650\u00b0C \u2192 Air Cool<\/td><\/tr><tr><td><strong>Achievable Hardness (HRC)<\/strong><\/td><td><strong>28\u201336 HRC<\/strong><\/td><td><strong>25\u201332 HRC<\/strong><\/td><\/tr><tr><td><strong>Impact Toughness (Charpy V)<\/strong><\/td><td><strong>High (~40\u201350J @ RT)<\/strong><\/td><td><strong>Lower (~25\u201335J @ RT)<\/strong><\/td><\/tr><tr><td><strong>Fatigue Strength<\/strong><\/td><td><strong>High<\/strong><\/td><td><strong>Lower (due to MnS inclusions)<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Key Differences:<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>EN24 achieves higher hardness &amp; toughness after heat treatment.<\/strong><\/li>\n\n\n\n<li><strong>EN24S does not respond as well to heat treatment due to MnS inclusions, reducing impact strength and fatigue life.<\/strong><\/li>\n\n\n\n<li><strong>Both grades require quenching &amp; tempering for optimal performance.<\/strong><\/li>\n\n\n\n<li><strong>EN24 is preferred for case-hardening (nitriding) applications due to better wear resistance.<\/strong><\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. Effects of Heat Treatment on Mechanical Properties<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Property<\/th><th>As Rolled<\/th><th>Normalized<\/th><th>Hardened &amp; Tempered (T Condition)<\/th><\/tr><\/thead><tbody><tr><td><strong>Tensile Strength (MPa)<\/strong><\/td><td>700\u2013850<\/td><td>800\u2013950<\/td><td><strong>850\u20131000 (EN24), 750\u2013900 (EN24S)<\/strong><\/td><\/tr><tr><td><strong>Yield Strength (MPa)<\/strong><\/td><td>500\u2013600<\/td><td>600\u2013700<\/td><td><strong>650\u2013800 (EN24), 550\u2013700 (EN24S)<\/strong><\/td><\/tr><tr><td><strong>Elongation (%)<\/strong><\/td><td>15\u201318<\/td><td>14\u201316<\/td><td><strong>13\u201316 (EN24), 10\u201314 (EN24S)<\/strong><\/td><\/tr><tr><td><strong>Hardness (HRC)<\/strong><\/td><td>20\u201325<\/td><td>25\u201330<\/td><td><strong>28\u201336 (EN24), 25\u201332 (EN24S)<\/strong><\/td><\/tr><tr><td><strong>Impact Strength (J)<\/strong><\/td><td>25\u201330<\/td><td>30\u201340<\/td><td><strong>40\u201350 (EN24), 25\u201335 (EN24S)<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Key Observations:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>EN24 retains high impact strength even after hardening.<\/strong><\/li>\n\n\n\n<li><strong>EN24S becomes brittle due to MnS inclusions, reducing its toughness.<\/strong><\/li>\n\n\n\n<li><strong>Both grades require tempering after hardening to prevent excessive brittleness.<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. Case Hardening (Nitriding &amp; Carburizing)<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>EN24:<\/strong> Can be nitrided (500\u2013550\u00b0C) or carburized (900\u00b0C) to achieve surface hardness <strong>55\u201360 HRC<\/strong>, improving wear resistance.<\/li>\n\n\n\n<li><strong>EN24S:<\/strong> Not recommended for case hardening because Sulphur-rich inclusions create weak points, reducing wear life.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion: Best Heat Treatment for Applications<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Application<\/th><th>Best Heat Treatment<\/th><th>Recommended Grade<\/th><\/tr><\/thead><tbody><tr><td><strong>Heavy-Duty Shafts &amp; Gears<\/strong><\/td><td>Quenched &amp; Tempered<\/td><td><strong>EN24<\/strong><\/td><\/tr><tr><td><strong>High-Strength Bolts &amp; Fasteners<\/strong><\/td><td>Quenched &amp; Tempered<\/td><td><strong>EN24<\/strong><\/td><\/tr><tr><td><strong>Aerospace &amp; Automotive Parts<\/strong><\/td><td>Hardened &amp; Tempered<\/td><td><strong>EN24<\/strong><\/td><\/tr><tr><td><strong>General Machined Components<\/strong><\/td><td>Normalized or Annealed<\/td><td><strong>EN24S<\/strong><\/td><\/tr><tr><td><strong>Surface Wear Resistance (Bearings, Rollers)<\/strong><\/td><td>Case-Hardened (Nitriding)<\/td><td><strong>EN24<\/strong><\/td><\/tr><tr><td><strong>Precision Machining (Threads, Bushings)<\/strong><\/td><td>Annealed<\/td><td><strong>EN24S<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Details on specific heat treatment procedures for industrial applications<\/strong>.<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Industrial Heat Treatment Procedures for EN24 &amp; EN24S<\/strong><\/h3>\n\n\n\n<p>Industrial heat treatment of EN24 and EN24S follows strict temperature controls to achieve optimal mechanical properties. Below are detailed procedures for different treatments.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. Annealing (Softening Treatment)<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Purpose:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Relieves internal stresses from manufacturing.<\/li>\n\n\n\n<li>Improves machinability by reducing hardness.<\/li>\n\n\n\n<li>Refines grain structure.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Procedure:<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Heat to <strong>830\u2013850\u00b0C<\/strong>.<\/li>\n\n\n\n<li>Hold at temperature for <strong>1 hour per 25 mm thickness<\/strong>.<\/li>\n\n\n\n<li>Furnace cool at <strong>slow rate (~20\u00b0C per hour)<\/strong> down to <strong>600\u00b0C<\/strong>.<\/li>\n\n\n\n<li>Allow to cool in air.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Expected Hardness:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>EN24:<\/strong> ~200\u2013220 HB (~20 HRC).<\/li>\n\n\n\n<li><strong>EN24S:<\/strong> ~180\u2013200 HB (~18 HRC).<\/li>\n<\/ul>\n\n\n\n<p><strong>Industrial Use:<\/strong> Ideal for parts that require extensive machining before hardening.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. Normalizing (Grain Refinement Treatment)<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Purpose:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Refines grain structure after forging or rolling.<\/li>\n\n\n\n<li>Improves strength and toughness before hardening.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Procedure:<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Heat to <strong>850\u2013880\u00b0C<\/strong>.<\/li>\n\n\n\n<li>Hold at temperature for <strong>30\u201360 minutes<\/strong> depending on thickness.<\/li>\n\n\n\n<li>Air cool in still air to room temperature.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Expected Hardness:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>EN24:<\/strong> ~250\u2013270 HB (~24\u201326 HRC).<\/li>\n\n\n\n<li><strong>EN24S:<\/strong> ~220\u2013240 HB (~20\u201322 HRC).<\/li>\n<\/ul>\n\n\n\n<p><strong>Industrial Use:<\/strong> Used before final heat treatment (hardening &amp; tempering) for better response to quenching.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. Hardening (Quenching Process for High Strength &amp; Wear Resistance)<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Purpose:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Increases hardness and tensile strength.<\/li>\n\n\n\n<li>Essential for high-stress applications (shafts, gears).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Procedure:<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Heat to <strong>820\u2013850\u00b0C<\/strong> (ensure uniform heating).<\/li>\n\n\n\n<li>Hold at temperature for <strong>30 minutes per 25 mm thickness<\/strong>.<\/li>\n\n\n\n<li><strong>Quench in oil<\/strong> (preferred for EN24) or water (in special cases).<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Post-Quenching Hardness:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>EN24:<\/strong> ~55\u201360 HRC (very hard, but brittle).<\/li>\n\n\n\n<li><strong>EN24S:<\/strong> ~50\u201355 HRC (lower due to MnS inclusions).<\/li>\n<\/ul>\n\n\n\n<p><strong>Industrial Use:<\/strong> After quenching, <strong>tempering is mandatory<\/strong> to reduce brittleness.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. Tempering (Balancing Hardness &amp; Toughness)<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Purpose:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reduces internal stresses from quenching.<\/li>\n\n\n\n<li>Improves toughness while maintaining strength.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Procedure:<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Reheat to <strong>400\u2013650\u00b0C<\/strong> depending on required hardness.<\/li>\n\n\n\n<li>Hold at temperature for <strong>1 hour per 25 mm thickness<\/strong>.<\/li>\n\n\n\n<li>Air cool to room temperature.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Hardness After Tempering:<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Tempering Temp (\u00b0C)<\/th><th>EN24 Hardness (HRC)<\/th><th>EN24S Hardness (HRC)<\/th><\/tr><\/thead><tbody><tr><td><strong>400\u00b0C<\/strong><\/td><td><strong>45\u201348<\/strong><\/td><td><strong>40\u201345<\/strong><\/td><\/tr><tr><td><strong>500\u00b0C<\/strong><\/td><td><strong>38\u201342<\/strong><\/td><td><strong>35\u201340<\/strong><\/td><\/tr><tr><td><strong>600\u00b0C<\/strong><\/td><td><strong>30\u201335<\/strong><\/td><td><strong>28\u201332<\/strong><\/td><\/tr><tr><td><strong>650\u00b0C<\/strong><\/td><td><strong>28\u201332<\/strong><\/td><td><strong>25\u201330<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Industrial Use:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>400\u2013500\u00b0C<\/strong>: Used for high-strength applications (shafts, axles).<\/li>\n\n\n\n<li><strong>550\u2013650\u00b0C<\/strong>: Used for high-impact parts (gears, bolts).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>5. Case Hardening (For Surface Wear Resistance)<\/strong><\/h2>\n\n\n\n<p>Used when high surface hardness is needed while maintaining a tough core.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>(A) Nitriding (Best for EN24, Not for EN24S)<\/strong><\/h3>\n\n\n\n<p><strong>Procedure:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Heat to <strong>500\u2013550\u00b0C<\/strong> in an ammonia gas atmosphere.<\/li>\n\n\n\n<li>Hold for <strong>10\u201350 hours<\/strong> (longer = deeper case depth).<\/li>\n\n\n\n<li>Cool slowly in an inert atmosphere.<\/li>\n<\/ol>\n\n\n\n<p><strong>Results:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Surface Hardness:<\/strong> ~55\u201360 HRC.<\/li>\n\n\n\n<li><strong>Case Depth:<\/strong> 0.3\u20130.7 mm.<\/li>\n<\/ul>\n\n\n\n<p><strong>Industrial Use:<\/strong> Used for aerospace shafts, cams, and wear-resistant components.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>(B) Carburizing (Not Common for EN24, More for Low-Alloy Steels)<\/strong><\/h3>\n\n\n\n<p><strong>Procedure:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Heat to <strong>900\u2013920\u00b0C<\/strong> in a carbon-rich environment.<\/li>\n\n\n\n<li>Hold for <strong>1\u20135 hours<\/strong> depending on case depth.<\/li>\n\n\n\n<li>Quench in oil for hard case and tough core.<\/li>\n<\/ol>\n\n\n\n<p><strong>Results:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Surface Hardness:<\/strong> ~58\u201362 HRC.<\/li>\n\n\n\n<li><strong>Case Depth:<\/strong> 0.5\u20131.5 mm.<\/li>\n<\/ul>\n\n\n\n<p><strong>Industrial Use:<\/strong> Used for bearings, gears, and rollers.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Summary of Best Heat Treatment for Different Applications<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Application<\/th><th>Recommended Heat Treatment<\/th><th>Best Grade<\/th><\/tr><\/thead><tbody><tr><td><strong>Heavy-Duty Shafts &amp; Gears<\/strong><\/td><td>Hardened (850\u00b0C Oil Quench) + Tempered (500\u00b0C)<\/td><td><strong>EN24<\/strong><\/td><\/tr><tr><td><strong>High-Stress Bolts &amp; Fasteners<\/strong><\/td><td>Hardened (850\u00b0C Oil Quench) + Tempered (550\u00b0C)<\/td><td><strong>EN24<\/strong><\/td><\/tr><tr><td><strong>Aerospace &amp; Automotive Parts<\/strong><\/td><td>Hardened (850\u00b0C Oil Quench) + Tempered (500\u00b0C)<\/td><td><strong>EN24<\/strong><\/td><\/tr><tr><td><strong>Bearings &amp; Rollers<\/strong><\/td><td>Nitrided (500\u00b0C)<\/td><td><strong>EN24<\/strong><\/td><\/tr><tr><td><strong>Precision Machined Parts<\/strong><\/td><td>Annealed (850\u00b0C Furnace Cool)<\/td><td><strong>EN24S<\/strong><\/td><\/tr><tr><td><strong>Gears &amp; Components Requiring Machining<\/strong><\/td><td>Normalized (880\u00b0C Air Cool)<\/td><td><strong>EN24S<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion:<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>EN24 is best for high-strength &amp; fatigue-resistant applications<\/strong> after <strong>hardening &amp; tempering<\/strong>.<\/li>\n\n\n\n<li><strong>EN24S is preferred for machining-intensive parts<\/strong>, but <strong>not recommended for high-stress applications<\/strong>.<\/li>\n\n\n\n<li><strong>Nitriding EN24 enhances wear resistance<\/strong> without excessive distortion.<\/li>\n\n\n\n<li><strong>Avoid excessive Sulphur (in EN24S) if high toughness &amp; fatigue life are needed<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>EN24 is a high-strength, low-alloy steel (equivalent to 4340) known for its toughness, wear resistance, and good mechanical properties. It typically contains 0.35\u20130.45% Carbon, 1.3\u20131.8% Nickel, 0.45\u20130.7% Chromium, 0.2\u20130.35% Molybdenum, and very low Sulphur (S) and Phosphorus (P) levels (usually below 0.04%). Effect of Increased Sulphur in EN24: Recommended Sulphur Content: For general applications, Sulphur [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2014","post","type-post","status-publish","format-standard","hentry","category-blog"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"MetaTechX LLP is an engineering services provider company dedicated to transforming the Steel &amp; Tube Industries through Advanced engineering, Technical expertise, and Skill development. 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