{"id":1499,"date":"2026-07-14T05:54:01","date_gmt":"2026-07-14T05:54:01","guid":{"rendered":"https:\/\/gearrack.top\/product\/mining-machinery-carburized-helical-gear-58-62-hrc-20crmnti\/"},"modified":"2026-07-14T05:54:14","modified_gmt":"2026-07-14T05:54:14","slug":"mining-machinery-carburized-helical-gear-58-62-hrc-20crmnti","status":"publish","type":"product","link":"https:\/\/gearrack.top\/ko\/product\/mining-machinery-carburized-helical-gear-58-62-hrc-20crmnti\/","title":{"rendered":"Mining Machinery Carburized Helical Gear – 58-62 HRC, 20CrMnTi"},"content":{"rendered":"
\n

Product Overview<\/h2>\n
\n
\n \"Mining\n <\/div>\n
\n

Mining machinery carburized helical gears<\/strong> are produced to operate in the most mechanically demanding gear applications in industry: continuous, heavy-load drives in bucket wheel excavators, large conveyor systems, ball mill drives, and other mining equipment that must run at high utilisation rates in environments with vibration, shock loading, and limited maintenance access. The performance requirements of these applications drive every aspect of the gear specification \u2014 material grade, carburising depth, core toughness, heat treatment process, and post-hardening accuracy.<\/p>\n

Korea Ever-Power produces these gears in 18CrNiMo6 alloy steel, a nickel-chromium-molybdenum grade specifically developed for case-hardening applications requiring exceptional core toughness. The production process follows a defined sequence: forging, carburisation, plane and internal grinding, tooth grinding<\/a>, and line cutting \u2014 each stage documented with traceability records. The finished gear is verified to DIN 3962 class 6 accuracy.<\/p>\n<\/p><\/div>\n<\/div>\n

Helical gears generally have longer and stronger teeth than spur gears. Due to the greater surface contact area on the teeth, helical gears carry heavy loads effectively. Forging produces helical gears that are quiet and generate less vibration than equivalent cut-from-bar-stock gears, because the forging process aligns the grain structure of the alloy with the tooth profile geometry. Korea Ever-Power supplies these gears up to 1,000 mm outer diameter and in modules up to 80, in hard (carburised), soft (through-hardened), or ground configurations depending on the application’s accuracy and load requirements.<\/p>\n

Technical Specifications<\/h2>\n

The gear basic data below is drawn directly from the standard production example for this product. Production capabilities cover a much wider range \u2014 see the capability tables below.<\/p>\n

<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Gear Basic Data<\/th>\n<\/tr>\n<\/thead>\n
Gear Tooth Shape<\/strong><\/td>\nInvolute<\/td>\n<\/tr>\n
Gear Material<\/strong><\/td>\n18CrNiMo6 (nickel-chromium-molybdenum case-hardening alloy steel)<\/td>\n<\/tr>\n
Gear Process<\/strong><\/td>\nForging \u2192 carburisation \u2192 plane and internal grinding \u2192 tooth grinding \u2192 line cutting<\/td>\n<\/tr>\n
Pressure Angle<\/strong><\/td>\n20\u00b0<\/td>\n<\/tr>\n
Quality Level<\/strong><\/td>\nDIN 3962 class 6<\/td>\n<\/tr>\n
Gear Type (Example)<\/strong><\/td>\nM = 9, Z = 33, \u03b1 = 20\u00b0, \u03b2 = 8\u00b0, x = 0.2, right-handed<\/td>\n<\/tr>\n
Max. O.D. (Production)<\/strong><\/td>\nUp to 1,000 mm O.D.; up to Module 80 (contact our team for very large sizes)<\/td>\n<\/tr>\n
Tooth Surface Hardness<\/strong><\/td>\n58\u201362 HRC (carburised and quenched); per heat treatment specification<\/td>\n<\/tr>\n
Configuration Options<\/strong><\/td>\nHard (carburised), Soft (through-hardened), or Ground \u2014 per application requirement<\/td>\n<\/tr>\n
Hand of Helix<\/strong><\/td>\nRight-hand and left-hand \u2014 both available<\/td>\n<\/tr>\n
OEM \/ Custom<\/strong><\/td>\nFull service; customer drawings, PPAP files, traceability marking, reverse engineering<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Gear \/ Spline Production Capabilities \u2014 Internal Gears and Internal Splines<\/strong><\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
<\/th>\nMilling<\/th>\nShaping<\/th>\nTooth Grinding<\/th>\n<\/tr>\n<\/thead>\n
Maximum O.D.<\/strong><\/td>\n2,500 mm<\/td>\n2,500 mm<\/td>\n2,500 mm<\/td>\n<\/tr>\n
Minimum I.D.<\/strong><\/td>\n650 mm<\/td>\n50 mm<\/td>\n100 mm<\/td>\n<\/tr>\n
Maximum Face Width<\/strong><\/td>\n500 mm<\/td>\n500 mm<\/td>\n500 mm<\/td>\n<\/tr>\n
Maximum Diametral Pitch<\/strong><\/td>\nD.P. 1<\/td>\nD.P. 1<\/td>\nD.P. 0.5<\/td>\n<\/tr>\n
Maximum Module<\/strong><\/td>\n26 mm<\/td>\n26 mm<\/td>\n45 mm<\/td>\n<\/tr>\n
AGMA \/ DIN Level<\/strong><\/td>\nDIN Class 8<\/td>\nDIN Class 8<\/td>\nDIN Class 4<\/td>\n<\/tr>\n
Tooth Surface Finish<\/strong><\/td>\nRa 3.2<\/td>\nRa 3.2<\/td>\nRa 0.6<\/td>\n<\/tr>\n
Maximum Helix Angle<\/strong><\/td>\n\u00b122.5\u00b0<\/td>\n\u00b122.5\u00b0<\/td>\n\u00b145\u00b0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Gear \/ Spline Production Capabilities \u2014 External Gears and External Splines<\/strong><\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
<\/th>\nHobbing<\/th>\nMilling<\/th>\nTooth Grinding<\/th>\n<\/tr>\n<\/thead>\n
Maximum O.D.<\/strong><\/td>\n1,250 mm<\/td>\n2,500 mm<\/td>\n2,500 mm<\/td>\n<\/tr>\n
Minimum O.D.<\/strong><\/td>\n20 mm<\/td>\n200 mm<\/td>\n20 mm<\/td>\n<\/tr>\n
Maximum Face Width<\/strong><\/td>\n500 mm<\/td>\n500 mm<\/td>\n1,480 mm<\/td>\n<\/tr>\n
Maximum Diametral Pitch<\/strong><\/td>\nD.P. 1<\/td>\nD.P. 1<\/td>\nD.P. 0.5<\/td>\n<\/tr>\n
Maximum Module<\/strong><\/td>\n26 mm<\/td>\n26 mm<\/td>\n45 mm<\/td>\n<\/tr>\n
AGMA \/ DIN Level<\/strong><\/td>\nDIN Class 8<\/td>\nDIN Class 8<\/td>\nDIN Class 4<\/td>\n<\/tr>\n
Tooth Surface Finish<\/strong><\/td>\nRa 3.2<\/td>\nRa 3.2<\/td>\nRa 0.6<\/td>\n<\/tr>\n
Maximum Helix Angle<\/strong><\/td>\n\u00b145\u00b0<\/td>\n\u00b145\u00b0<\/td>\n\u00b145\u00b0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

18CrNiMo6 Material and the Carburising Process<\/h2>\n

\"Ever-Power<\/p>\n

The choice of 18CrNiMo6 and the carburising process for mining machinery helical gears is not arbitrary \u2014 it reflects the specific combination of properties required in heavy mining drives that no other material and heat treatment combination achieves as effectively.<\/p>\n

\n

Why 18CrNiMo6?<\/strong><\/p>\n

18CrNiMo6 is a nickel-chromium-molybdenum low-carbon alloy steel designed for case hardening. The nickel content (1.4\u20131.7%) provides exceptional core toughness and impact resistance \u2014 the core of the gear tooth, which must absorb bending fatigue and shock loads, is at its toughest in this alloy. The chromium (1.5\u20131.8%) and molybdenum (0.25\u20130.35%) increase hardenability, ensuring the carburised case achieves full hardness through its depth even in large gear sections, and improve resistance to temper embrittlement. This combination makes 18CrNiMo6 the preferred material for large, high-load mining gear blanks that must be fully hardened to the case without leaving soft spots that would reduce fatigue life.<\/p>\n<\/div>\n

\n

Carburising Sequence<\/strong><\/p>\n

After rough machining, the gear blank is carburised in a controlled atmosphere furnace at 850\u2013950\u00b0C. Carbon is diffused into the tooth surface to a concentration of 0.8\u20131.0% to the required case depth (typically 1.5\u20133.0 mm for large mining gears). The gear is then quenched \u2014 oil quench is standard for 18CrNiMo6 \u2014 followed by low-temperature tempering at 150\u2013200\u00b0C to reduce quench stresses while maintaining case hardness. The case achieves 58\u201362 HRC; the core remains at 30\u201345 HRC, providing the toughness to resist tooth root bending fatigue and shock loads from the mining process.<\/p>\n<\/div>\n

\n

Post-Hardening Grinding to DIN 3962 Class 6<\/strong><\/p>\n

Carburising introduces dimensional distortion \u2014 typically 0.1\u20130.5 mm of profile and pitch deviation for large gears. This distortion is corrected by tooth grinding after hardening: plane and internal grinding establish the datum surfaces, then tooth grinding remachines the tooth flanks to DIN 3962 class 6 tolerance on the hardened blank. Line cutting (wire EDM) is used for features that cannot be ground. The result is a gear that combines 58\u201362 HRC surface hardness with tooth profile accuracy at DIN 6 \u2014 the combination that defines a mining-grade carburised and ground helical gear.<\/p>\n<\/div>\n

Service Programme<\/h2>\n

\"Ever-Power<\/p>\n

\n
\n

Before Sales<\/h3>\n
    \n
  1. Customer provides detailed drawings.<\/li>\n
  2. Evaluate drawing, communicate technical and quality questions, then prepare quotation.<\/li>\n
  3. Face-to-face communication for unresolved technical points.<\/li>\n
  4. Prepare PPAP files for automotive and critical industrial programmes.<\/li>\n<\/ol><\/div>\n
    \n

    Design Cooperation (When No Drawing)<\/h3>\n
      \n
    1. Customer provides application data without a detailed drawing.<\/li>\n
    2. Evaluate the application, simulate and optimise the gear design, produce a detailed drawing, then quote.<\/li>\n
    3. Prepare PPAP files.<\/li>\n<\/ol><\/div>\n
      \n

      In Process<\/h3>\n
        \n
      1. Communicate technical questions identified during process planning.<\/li>\n
      2. Apply permanent traceability marking on each workpiece.<\/li>\n
      3. Complete production flow and transportation packing plan.<\/li>\n<\/ol><\/div>\n
        \n

        After-Sales<\/h3>\n
          \n
        1. Follow the product’s application condition in service.<\/li>\n
        2. Quality complaints: feedback within 24 hours; 8D report within 48 hours; field support if required.<\/li>\n
        3. Continuous improvement of machining processes, product quality, and lead time.<\/li>\n
        4. Annual customer visits to improve technical, quality, and commercial cooperation.<\/li>\n<\/ol><\/div>\n<\/div>\n

          Applications<\/h2>\n

          \"measuring<\/p>\n

          \n
          \n
          ⛏<\/div>\n

          Bucket Wheel Excavators<\/h3>\n

          Slewing ring drives, bucket wheel drives, and conveyor elevation drives in large bucket wheel excavators. These are among the largest and heaviest-loaded helical gear applications in existence, operating continuously at high utilisation rates in open-cast mining environments with vibration and shock loading.<\/p>\n<\/p><\/div>\n

          \n
          🚙<\/div>\n

          Conveyor Head Drives<\/h3>\n

          Large overland and in-pit conveyor head and tail drive gearboxes. These gearboxes operate at near-continuous duty and must achieve long service life between overhauls. The carburised 18CrNiMo6 tooth provides the surface pitting resistance required at the contact stresses imposed by high-capacity conveyor drives.<\/p>\n<\/p><\/div>\n

          \n
          📈<\/div>\n

          Ball Mill Drives<\/h3>\n

          Ball mill main drive gearboxes in mineral processing plants. Ball mill drives start under full load and are subject to the mill’s grinding torque throughout operation. The combination of carburised case hardness and tough core is essential to withstand the sustained high torque without pitting or tooth root fatigue.<\/p>\n<\/p><\/div>\n

          \n
          👨‍🔨<\/div>\n

          Presses and Rolling Mills<\/h3>\n

          Heavy press drives and rolling mill reduction gearboxes where the gear must carry peak loads during the working stroke or rolling bite while maintaining DIN 6 tooth accuracy for smooth, low-vibration operation between the load peaks.<\/p>\n<\/p><\/div>\n

          \n
          ⚥<\/div>\n

          Rudder and Marine Drives<\/h3>\n

          Large vessel rudder drives and marine reduction gearboxes where high sustained torque and long service life between drydock overhauls are both required. 18CrNiMo6 carburised and ground to DIN 6 with classification society documentation for new-build vessels.<\/p>\n<\/p><\/div>\n<\/div>\n

          Frequently Asked Questions<\/h2>\n
          \n
          \n

          What should I do if I cannot identify the gear that failed?<\/p>\n

          Send us the damaged gear. Korea Ever-Power specialises in reverse engineering of large industrial and mining gears. Our team will measure the outer diameter, tooth count, helix angle, hand, pressure angle, profile shift coefficient, bore, hub, and face width from the physical gear, prepare a complete production drawing, and submit it for customer approval before cutting begins. For very large gears where shipping the full part is impractical, we can work from detailed dimensional reports and photographs supplemented by key measurement data provided by the customer’s maintenance team.<\/p>\n<\/div>\n

          \n
          \n

          What is the minimum order quantity for mining machinery helical gears?<\/p>\n

          MOQ depends on the specific gear size and configuration. Send us your drawing or sample, specify the required quantity, and we will confirm the minimum. For large mining gears at module 9 or above, MOQ is typically one pair (pinion and wheel together), since the mating geometry must be verified together. For smaller configuration sizes, minimum quantities may be higher.<\/p>\n<\/div>\n

          \n
          \n

          How is fast delivery achieved without finished stock?<\/p>\n

          Korea Ever-Power maintains a large inventory of tools, raw material billets and forgings in the most common alloy grades (including 18CrNiMo6), and semi-finished blanks in common size ranges. Production begins immediately upon order confirmation. For urgent replacement gears in mining applications, contact our team directly \u2014 we will assess the production queue and confirm the fastest available lead time for your specific configuration.<\/p>\n<\/div>\n

          \n
          \n

          Can gears not shown on this site be manufactured?<\/p>\n

          Yes. Everything listed on the Korea Ever-Power website represents the categories of gear we produce \u2014 not a fixed catalogue of available sizes. We can manufacture any mining helical gear configuration in 18CrNiMo6 or other suitable alloy steels, at any module and tooth count achievable within the production capabilities shown in the specification tables. Custom gear designs are our core capability, not an exception to it.<\/p>\n<\/div>\n

          \n
          \n

          How is the lowest price achieved for mining helical gear orders?<\/p>\n

          For mining helical gears, the primary price factors are module size (which determines machine capacity and grinding time), material specification, accuracy grade, face width, and required documentation. Quantity influences per-unit cost \u2014 larger orders allow amortisation of setup and heat treatment batch costs across more parts. Providing a complete drawing with all parameters at the enquiry stage, rather than adding requirements during negotiation, produces the most accurate initial quotation and avoids additional cost at the change order stage. Contact our team<\/a> with your drawing and required quantity for a detailed price breakdown.<\/p>\n<\/div>\n<\/div>\n

          Customer Reviews<\/h2>\n
          \n
          \n

          “We maintain a large-format bucket wheel excavator and required replacement reduction gearbox helical gear pairs in 18CrNiMo6 at DIN 6 \u2014 the OEM had quoted a 26-week lead time. Korea Ever-Power reverse-engineered the specification from our worn gear set, provided the production drawing for approval within 6 working days, and delivered within our required maintenance window. Heat treatment records and CMM reports accompanied the delivery.”<\/p>\n

          Kim Byeong-cheol<\/strong>  |  Chief Engineer, Gyeongnam Open Cast Mining Co.  ·  Q1 2026<\/em><\/p>\n<\/div>\n

          \n

          “We design ball mill drives for mineral processing plants and qualified Korea Ever-Power as a supplier for carburised helical gear<\/a> sets in 18CrNiMo6. The 8D after-sales protocol was demonstrated during a quality issue on the second batch \u2014 root cause identified and corrective action implemented within the committed 48 hours. Subsequent deliveries have all been within specification.”<\/p>\n

          Park Sung-woo<\/strong>  |  Drivetrain Engineer, Incheon Mineral Processing Equipment  ·  Q3 2025<\/em><\/p>\n<\/div>\n

          \n

          “We supply conveyor head drives to an iron ore mining operation and source the main helical gear pairs from Korea Ever-Power. The traceability code on each gear links back to the heat treatment furnace run number and raw material batch. This traceability has been essential for our ISO quality system audit \u2014 the auditor was satisfied with the documentation level without any additional requests.”<\/p>\n

          Lee Sang-hoon<\/strong>  |  Production Manager, Busan Mining Equipment Co.  ·  Q4 2025<\/em><\/p>\n<\/div>\n

          \n

          “We needed an M9 carburised helical pinion to replace a failed unit in a press reduction gearbox with no drawing available. Ever-Power measured the mating wheel on site, calculated the pinion geometry to match, and produced a replacement pinion in 18CrNiMo6 at DIN 6. The new pinion meshed correctly with the existing wheel on first installation. Press returned to production within the planned shutdown window.”<\/p>\n

          Choi Dong-seok<\/strong>  |  Plant Maintenance Director, Ulsan Heavy Press Manufacturing  ·  Q2 2025<\/em><\/p>\n<\/div>\n

          \n

          “We qualified Korea Ever-Power for 18CrNiMo6 carburised helical gears through our PPAP process. The design cooperation service was useful \u2014 our application data did not include a finished gear drawing, only the gearbox input\/output parameters. Ever-Power’s team produced the optimised gear geometry, drew it up, and submitted for our approval before any production began. PPAP Level 3 package was accepted at first submission.”<\/p>\n

          Yoon Jae-hyuk<\/strong>  |  Drivetrain Qualification Engineer, Daejeon Mining Systems  ·  Q1 2026<\/em><\/p>\n<\/div>\n<\/div>\n

          Related Products<\/h2>\n
          \n
          \n
          \n \"Double
          \n <\/a><\/p>\n
          \n

          Helical Gears<\/h3>\n

          Korea Ever-Power’s full helical gear range covers double helical gears for zero-thrust drives, metallurgy soft tooth flank gears, beverage and food machinery gears, and high-speed hard tooth flank gears \u2014 complete heavy-industry helical gear production capability.<\/p>\n

          Browse Helical Gears \u2192<\/a>\n <\/div>\n<\/p><\/div>\n

          \n
          \n \"Forging
          \n <\/a><\/p>\n
          \n

          \ubca0\ubca8 \uae30\uc5b4<\/h3>\n

          Korea Ever-Power’s forged bevel gears cover straight and spiral profiles in alloy steel with full heat treatment \u2014 the right-angle direction-change complement to parallel-axis helical gears in mining and heavy industrial drive trains.<\/p>\n

          Browse Bevel Gears \u2192<\/a>\n <\/div>\n<\/p><\/div>\n<\/div>\n

          \n

          Request a Quotation for Mining Machinery Carburized Helical Gears<\/h3>\n

          Send your drawing or damaged gear for reverse engineering. For new designs, provide module, tooth count, helix angle, material, case depth, and accuracy grade. 8D after-sales support; PPAP available. Quality complaints resolved within 24 hours.<\/p>\n

          Get a Quote Now<\/a>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

          Korea Ever-Power mining machinery carburized helical gears are produced in 18CrNiMo6 alloy steel through a full process sequence of forging, carburisation, plane and internal grinding, tooth grinding, and line cutting to achieve DIN 3962 class 6 accuracy. The standard production example is M9, Z33, 20\u00b0 pressure angle, 8\u00b0 helix angle (right-handed) with profile shift x=0.2. These gears serve bucket wheel excavator drives, conveyor head drives, ball mill drives, and other continuous high-load mining equipment where tooth surface hardness, core toughness, and verified dimensional accuracy are the primary specification requirements.<\/p>","protected":false},"featured_media":1500,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[4558],"product_tag":[],"class_list":["post-1499","product","type-product","status-publish","has-post-thumbnail","product_cat-helical-gear","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/product\/1499","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/comments?post=1499"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/media\/1500"}],"wp:attachment":[{"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/media?parent=1499"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/product_brand?post=1499"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/product_cat?post=1499"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/gearrack.top\/ko\/wp-json\/wp\/v2\/product_tag?post=1499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}