MIL-S-46850D ROUND BAR MANUFACTURING: HIGH-STRENGTH 18% NICKEL MARAGING STEEL FOR AEROSPACE AND DEFENSE MIL-S-46850D ROUND BAR MANUFACTURING OVERVIEW MIL-S-46850D ROUND BAR MANUFACTURING COVERS HIGH-QUALITY 18 PERCENT NICKEL MARAGING STEEL DEVELOPED FOR APPLICATIONS REQUIRING AN EXCEPTIONAL COMBINATION OF TENSILE STRENGTH, TOUGHNESS, DIMENSIONAL STABILITY, FATIGUE PERFORMANCE, AND HEAT-TREATMENT RESPONSE. MIL-S-46850D IS THE U.S. MILITARY SPECIFICATION TITLED “STEEL: BAR, PLATE, SHEET, STRIP, FORGINGS, AND EXTRUSIONS, 18 PERCENT NICKEL ALLOY, MARAGING, 200 KSI, 250 KSI, 300 KSI, AND 350 KSI, HIGH QUALITY.” THE SPECIFICATION COVERS FOUR STRENGTH CLASSES—200, 250, 300 AND 350 KSI—AND DEFINES BOTH MATERIAL PRODUCTION AND QUALITY REQUIREMENTS. FOR MODERN PROCUREMENT, MIL-S-46850D ROUND BAR, MARAGING STEEL ROUND BAR, 18NI MARAGING STEEL BAR, MARAGING 250 ROUND BAR, MARAGING 300 ROUND BAR, AND MARAGING 350 ROUND BAR ARE AMONG THE MOST COMMERCIALLY RELEVANT SEARCH EXPRESSIONS. THE SPECIFICATION IS HISTORICALLY IMPORTANT, BUT MIL-S-46850D WAS PLACED INACTIVE FOR NEW DESIGN BY NOTICE 1 IN 1997 AND IS GENERALLY REFERENCED FOR REPLACEMENT, LEGACY, QUALIFICATION, OR SPECIFICATION-CONTROLLED REQUIREMENTS RATHER THAN AS A PREFERRED NEW-DESIGN SPECIFICATION. WHAT IS MIL-S-46850D MARAGING STEEL? MIL-S-46850D DEFINES A FAMILY OF LOW-CARBON, NICKEL-RICH MARAGING STEELS CAPABLE OF ACHIEVING VERY HIGH ULTIMATE TENSILE PROPERTIES THROUGH RELATIVELY LOW-TEMPERATURE AGING TREATMENT. UNLIKE CONVENTIONAL QUENCHED-AND-TEMPERED HIGH-STRENGTH STEELS, MARAGING STEEL DERIVES MUCH OF ITS STRENGTH FROM PRECIPITATION HARDENING OF A TOUGH, LOW-CARBON MARTENSITIC MATRIX. THE OFFICIAL SPECIFICATION IDENTIFIES AIR-ARC-MELTED AND VACUUM-DEGASSED MATERIAL CLASSIFICATIONS AND COVERS BAR, PLATE, SHEET, STRIP, FORGINGS AND EXTRUSIONS. COMMERCIAL MARAGING GRADES ASSOCIATED WITH MIL-S-46850D INCLUDE MARAGING 250, MARAGING 300 AND MARAGING 350, WITH INDUSTRY CROSS-REFERENCES COMMONLY CONNECTING THESE MATERIALS TO AMS 6512, AMS 6514 AND AMS 6515, RESPECTIVELY. MIL-S-46850D ROUND BAR GRADES MARAGING 200 MARAGING 200 REPRESENTS THE LOWER-STRENGTH CLASS IN THE MIL-S-46850D FAMILY. IT IS SELECTED WHERE HIGH STRENGTH IS REQUIRED WHILE RETAINING A USEFUL BALANCE OF TOUGHNESS, MACHINABILITY AND DIMENSIONAL STABILITY. THE 200 KSI CLASS IS ASSOCIATED IN COMMERCIAL GRADE SYSTEMS WITH THE BROADER 18NI MARAGING 200 / C200 NOMENCLATURE. SOME SUPPLIERS ASSOCIATE THE CLASS WITH AMS 6511, ALTHOUGH EXACT EQUIVALENCY SHOULD ALWAYS BE VERIFIED AGAINST THE PURCHASE SPECIFICATION AND HEAT-TREATMENT CONDITION RATHER THAN ASSUMED FROM A GENERIC GRADE NAME. MARAGING 250 MARAGING 250 ROUND BAR IS ONE OF THE MOST WIDELY RECOGNIZED GRADES IN THE FAMILY. COMMERCIAL CROSS-REFERENCES INCLUDE UNS K92890, AMS 6512, ASTM A579 GRADE 72, ASTM A646 IN RELEVANT PRODUCT CONTEXTS, BS S162, AND WERKSTOFF 1.6359 / X2NICOMO18-8-5 REFERENCES USED IN EUROPEAN MATERIAL CLASSIFICATIONS. MARAGING 300 MARAGING 300 ROUND BAR IS WIDELY USED WHERE AN EXTREMELY HIGH STRENGTH LEVEL IS REQUIRED WITHOUT SACRIFICING THE CHARACTERISTIC TOUGHNESS AND MACHINABILITY OF MARAGING STEEL. MAJOR COMMERCIAL IDENTIFIERS INCLUDE UNS K93120, AMS 6514, ASTM A579 GRADE 73, X2NICOMO18-9-5, AND WERKSTOFF REFERENCES AROUND 1.6354 / 1.6358, DEPENDING ON THE EXACT MATERIAL DESIGNATION AND CONDITION. MARAGING 350 MARAGING 350 ROUND BAR PROVIDES A STILL HIGHER STRENGTH LEVEL AND IS COMMONLY MARKETED UNDER MARAGING 350, C350, AND VASCOMAX 350 TERMINOLOGY. COMMERCIAL REFERENCES CONNECT IT WITH AMS 6515, MIL-S-46850D AND UNS DESIGNATIONS INCLUDING S35000 AND K93540 IN DIFFERENT SUPPLIER AND STANDARDS CONTEXTS. BECAUSE UNS, EN/WERKSTOFF, ASTM AND AMS DESIGNATIONS CAN DIFFER BY GRADE, PRODUCT FORM AND REVISION, A TECHNICAL PURCHASER SHOULD VALIDATE THE EXACT EQUIVALENCY FROM THE GOVERNING MATERIAL CERTIFICATE AND APPLICABLE SPECIFICATION. INTERNATIONAL EQUIVALENTS AND SIMILAR DESIGNATIONS ONE OF THE STRONGEST PROCUREMENT ASPECTS OF MIL-S-46850D ROUND BAR MANUFACTURING IS THE LARGE NUMBER OF NAMES USED ACROSS INTERNATIONAL SUPPLY CHAINS. COMMON INTERNATIONAL AND TRADE REFERENCES INCLUDE: UNITED STATES: MIL-S-46850D, AMS 6512, AMS 6514, AMS 6515, ASTM A579 GRADE 72, ASTM A579 GRADE 73, ASTM A538 AND RELEVANT ASTM MARAGING-STEEL REFERENCES. UNS DESIGNATIONS: UNS K92890 FOR MARAGING 250 AND UNS K93120 FOR MARAGING 300 ARE ESPECIALLY COMMON COMMERCIAL IDENTIFIERS. MARAGING 350 IS ALSO ENCOUNTERED UNDER S35000 AND K93540 DEPENDING ON THE MATERIAL DATABASE AND DESIGNATION CONTEXT. EUROPEAN TERMINOLOGY: 1.6359, 1.6354, X2NICOMO18-8-5, AND X2NICOMO18-9-5 ARE FREQUENTLY ENCOUNTERED FOR MARAGING 250 AND 300 MATERIALS. UNITED KINGDOM: BS S162 IS A COMMONLY CITED EQUIVALENT OR COMPARABLE DESIGNATION FOR MARAGING 250. COMMERCIAL AND PROPRIETARY NAMES: VASCOMAX 250, VASCOMAX 300, VASCOMAX C350, UDIMAR 250, UDIMAR 300, MARAGING C250, MARAGING C300, AND MARAGING C350 ARE AMONG THE NAMES FOUND IN INTERNATIONAL COMMERCIAL LITERATURE. VASCOMAX IS A REGISTERED TRADEMARK ASSOCIATED WITH ATI / ALLEGHENY TECHNOLOGIES. THESE NAMES SHOULD BE TREATED AS GRADE FAMILIES OR COMMERCIAL DESIGNATIONS RATHER THAN AUTOMATICALLY INTERCHANGEABLE CERTIFICATES. A PROCUREMENT DOCUMENT SHOULD STATE THE EXACT STANDARD, GRADE, MELTING ROUTE, DIMENSIONS, HEAT-TREATMENT CONDITION AND INSPECTION REQUIREMENTS. CHEMICAL CHARACTERISTICS OF MIL-S-46850D ROUND BAR MIL-S-46850D MARAGING STEELS ARE CHARACTERIZED BY: • APPROXIMATELY 18 PERCENT NICKEL • VERY LOW CARBON • COBALT ADDITIONS • MOLYBDENUM ADDITIONS • TITANIUM ADDITIONS • CONTROLLED ALUMINUM • IRON AS THE BALANCE TYPICAL COMMERCIAL COMPOSITIONS REPORTED FOR MARAGING 250, 300 AND 350 SHOW NICKEL AROUND 18.5%, MOLYBDENUM AROUND 4.8%, WITH COBALT AND TITANIUM INCREASING WITH STRENGTH GRADE. FOR EXAMPLE, COMMERCIAL DATA FOR 250, 300 AND 350 LISTS APPROXIMATELY 7.5%, 9.0% AND 12.0% COBALT, RESPECTIVELY. THIS CHEMISTRY PRODUCES THE COMBINATION OF LOW-CARBON MARTENSITIC TOUGHNESS AND PRECIPITATION-STRENGTHENING CAPABILITY THAT DISTINGUISHES MARAGING STEEL FROM TRADITIONAL ALLOY STEELS. MIL-S-46850D ROUND BAR MANUFACTURING PROCESS RAW MATERIAL SELECTION AND MELTING MANUFACTURING STARTS WITH CAREFULLY CONTROLLED RAW MATERIALS SELECTED TO ACHIEVE THE REQUIRED NICKEL, COBALT, MOLYBDENUM AND TITANIUM CHEMISTRY. MIL-S-46850D IDENTIFIES DIFFERENT MELTING CLASSIFICATIONS, INCLUDING AIR-ARC-MELTED STEEL AND VACUUM-DEGASSED STEEL. FOR DEMANDING AEROSPACE AND DEFENSE PRODUCTION, CONTROLLED MELTING AND REFINING PRACTICES ARE CRITICAL BECAUSE INCLUSIONS, SEGREGATION AND RESIDUAL ELEMENTS CAN HAVE A DIRECT INFLUENCE ON FATIGUE LIFE AND FRACTURE PERFORMANCE. PRIMARY BREAKDOWN AFTER MELTING AND SOLIDIFICATION, THE MATERIAL UNDERGOES PRIMARY BREAKDOWN THROUGH SUITABLE HOT-WORKING OPERATIONS. DEPENDING ON THE STARTING GEOMETRY AND MILL CONFIGURATION, THIS CAN INCLUDE FORGING, COGGING OR HOT ROLLING. THE PURPOSE IS TO REDUCE CASTING STRUCTURE, REFINE GRAIN STRUCTURE AND ESTABLISH A SOUND METALLURGICAL FOUNDATION FOR SUBSEQUENT ROUND-BAR PROCESSING. HOT WORKING AND BAR FORMATION BILLETS OR BLOOMS ARE CONVERTED INTO ROUND BAR THROUGH CONTROLLED FORGING OR ROLLING. PROCESS TEMPERATURE, REDUCTION RATIO AND FINISHING CONDITIONS MUST BE CLOSELY CONTROLLED TO ACHIEVE THE SPECIFIED MICROSTRUCTURAL UNIFORMITY. FOR HIGH-INTEGRITY AEROSPACE MARAGING STEEL ROUND BAR, PROCESS CONTROL ALSO FOCUSES ON INTERNAL SOUNDNESS, CENTERLINE QUALITY, SURFACE INTEGRITY AND REPRODUCIBILITY FROM HEAT TO HEAT. SOLUTION TREATMENT MARAGING STEEL IS SUPPLIED AND PROCESSED THROUGH CONTROLLED SOLUTION TREATMENT DESIGNED TO ESTABLISH THE REQUIRED SOFT, WORKABLE CONDITION BEFORE AGING. PROPER SOLUTION TREATMENT IS PARTICULARLY IMPORTANT BECAUSE THE FINAL MECHANICAL PROPERTIES DEPEND ON THE INTERACTION BETWEEN THE PRIOR SOLUTION-TREATED STRUCTURE AND THE SUBSEQUENT PRECIPITATION-AGING CYCLE. MACHINING AND CONDITIONING MARAGING STEEL IS COMPARATIVELY EASY TO MACHINE IN THE SOLUTION-TREATED OR SOFT CONDITION. THIS MAKES IT ATTRACTIVE FOR PRECISION SHAFTS, DIES, TOOLING, AEROSPACE COMPONENTS AND COMPLEX MACHINED PARTS. ROUND BARS MAY BE CENTERLESS GROUND, PEELED, TURNED, POLISHED OR PRECISION GROUND DEPENDING ON DIMENSIONAL AND SURFACE REQUIREMENTS. AGING TREATMENT THE DEFINING MANUFACTURING OPERATION IS AGE HARDENING. AFTER SOLUTION TREATMENT AND MACHINING, CONTROLLED AGING PRECIPITATES STRENGTHENING PHASES WITHIN THE MARTENSITIC MATRIX. THE RESULT IS A SUBSTANTIAL INCREASE IN HARDNESS, YIELD STRENGTH AND TENSILE STRENGTH. MIL-S-46850D IS SPECIFICALLY BUILT AROUND ACHIEVING HIGH ULTIMATE TENSILE PROPERTIES THROUGH A RELATIVELY LOW-TEMPERATURE HEAT-TREATMENT PROCESS. THE EXACT AGING CYCLE MUST BE TAKEN FROM THE APPLICABLE MATERIAL SPECIFICATION, GRADE AND REVISION RATHER THAN COPIED FROM A GENERIC MARAGING-STEEL RECIPE. QUALITY CONTROL IN MIL-S-46850D ROUND BAR MANUFACTURING HIGH-QUALITY MIL-S-46850D ROUND BAR REQUIRES FAR MORE THAN CHEMICAL COMPLIANCE. DEPENDING ON THE CONTRACTUAL REQUIREMENT, MANUFACTURERS MAY CONTROL: CHEMICAL ANALYSIS: VERIFICATION OF NICKEL, COBALT, MOLYBDENUM, TITANIUM, ALUMINUM, CARBON, MANGANESE, SILICON, PHOSPHORUS, SULFUR AND TRACE-ELEMENT LIMITS. MECHANICAL TESTING: TENSILE STRENGTH, YIELD STRENGTH, ELONGATION AND REDUCTION OF AREA ARE IMPORTANT INDICATORS OF FINAL MATERIAL PERFORMANCE. HARDNESS TESTING: HARDNESS IS COMMONLY MEASURED TO VERIFY CONSISTENCY AFTER THE REQUIRED HEAT TREATMENT. METALLURGICAL EXAMINATION: MICROSTRUCTURE EVALUATION CAN HELP IDENTIFY SEGREGATION, ABNORMAL GRAIN STRUCTURE, INCLUSIONS AND UNDESIRABLE PHASES. ULTRASONIC TESTING: WHERE SPECIFIED, ULTRASONIC INSPECTION IS USED TO IDENTIFY INTERNAL DISCONTINUITIES. SURFACE EXAMINATION: GRINDING, PEELING AND MACHINING OPERATIONS MAY BE USED TO REMOVE SURFACE IMPERFECTIONS AND ACHIEVE THE REQUIRED FINISH. DIMENSIONAL INSPECTION: DIAMETER, ROUNDNESS, STRAIGHTNESS, LENGTH AND TOLERANCE ARE VERIFIED AGAINST THE PURCHASE ORDER AND APPLICABLE BAR REQUIREMENTS. TRACEABILITY: HEAT NUMBER IDENTIFICATION AND MILL TEST CERTIFICATION ARE ESPECIALLY IMPORTANT FOR AEROSPACE, DEFENSE AND OTHER SAFETY-CRITICAL APPLICATIONS. MIL-S-46850D ROUND BAR DIMENSIONS AND SURFACE FINISHES MANUFACTURERS MAY SUPPLY MARAGING STEEL ROUND BAR IN A BROAD RANGE OF DIAMETERS AND LENGTHS ACCORDING TO PRODUCTION CAPABILITY AND CUSTOMER REQUIREMENTS. COMMON COMMERCIAL DESCRIPTIONS INCLUDE: MARAGING STEEL ROUND BAR MARAGING STEEL BRIGHT BAR MARAGING STEEL PRECISION GROUND BAR MARAGING STEEL FORGED ROUND BAR MARAGING STEEL HOT ROLLED BAR MARAGING STEEL PEELED BAR MARAGING STEEL GROUND BAR MARAGING STEEL SHAFT BAR AVAILABLE FINISHES MAY INCLUDE BLACK HOT-FINISHED SURFACES, PEELED SURFACES, CENTERLESS-GROUND SURFACES, POLISHED SURFACES AND PRECISION-GROUND FINISHES. FOR CLOSE-TOLERANCE CNC MACHINING, PRECISION GROUND MARAGING STEEL ROUND BAR IS PARTICULARLY VALUABLE BECAUSE REDUCED STOCK VARIATION SIMPLIFIES MACHINING AND IMPROVES DIMENSIONAL CONTROL. MECHANICAL AND METALLURGICAL ADVANTAGES MIL-S-46850D MARAGING STEEL OFFERS SEVERAL CHARACTERISTICS THAT EXPLAIN ITS LONG-STANDING POPULARITY. ULTRA-HIGH STRENGTH THE 250, 300 AND 350 CLASSES PROVIDE STRENGTH LEVELS SUITABLE FOR HIGHLY LOADED AEROSPACE, DEFENSE AND INDUSTRIAL COMPONENTS. EXCELLENT TOUGHNESS DESPITE ITS VERY HIGH STRENGTH, MARAGING STEEL RETAINS A USEFUL TOUGHNESS LEVEL BECAUSE OF ITS LOW-CARBON METALLURGY. GOOD MACHINABILITY THE SOLUTION-TREATED CONDITION IS CONSIDERABLY EASIER TO MACHINE THAN MANY CONVENTIONAL ULTRA-HIGH-STRENGTH STEELS. DIMENSIONAL STABILITY THE CONTROLLED AGING MECHANISM CAN PROVIDE PREDICTABLE DIMENSIONAL BEHAVIOR, MAKING MARAGING STEEL ATTRACTIVE FOR PRECISION TOOLING AND AEROSPACE COMPONENTS. HIGH FATIGUE RESISTANCE PROPERLY MANUFACTURED AND HEAT-TREATED MARAGING STEEL IS SUITED TO CYCLIC LOADING APPLICATIONS WHERE STRENGTH AND FRACTURE RESISTANCE ARE CRITICAL. WELDABILITY THE VERY LOW CARBON CONTENT GIVES MARAGING STEELS FAVORABLE WELDABILITY COMPARED WITH MANY CONVENTIONAL HIGH-CARBON HIGH-STRENGTH STEELS, ALTHOUGH WELDING PROCEDURES AND POST-WELD AGING MUST BE ENGINEERED FOR THE SPECIFIC APPLICATION. APPLICATIONS OF MIL-S-46850D ROUND BAR MIL-S-46850D ROUND BAR MANUFACTURING SUPPORTS APPLICATIONS WHERE HIGH STRENGTH-TO-WEIGHT RATIO AND HIGH MECHANICAL RELIABILITY ARE IMPORTANT. TYPICAL APPLICATION SECTORS INCLUDE: AEROSPACE: AIRCRAFT LANDING GEAR COMPONENTS, HIGH-STRENGTH SHAFTS, STRUCTURAL FITTINGS, ACTUATORS, TOOLING AND OTHER PRECISION COMPONENTS. DEFENSE: MISSILE AND ROCKET HARDWARE, HIGH-STRENGTH STRUCTURAL COMPONENTS, LAUNCH EQUIPMENT, WEAPON-SYSTEM HARDWARE AND OTHER DEMANDING DEFENSE APPLICATIONS. TOOLING AND DIES: HIGH-STRENGTH DIES, MOLDS, FORMING TOOLS, PUNCHES AND PRECISION TOOLING. MOTORSPORT AND HIGH-PERFORMANCE ENGINEERING: HIGH-STRENGTH SHAFTS, DRIVELINE COMPONENTS AND SPECIALIZED MECHANICAL PARTS. GAS CENTRIFUGE AND PRECISION ROTATING EQUIPMENT: MARAGING STEELS ARE ALSO RECOGNIZED FOR APPLICATIONS INVOLVING HIGH ROTATIONAL STRESSES. INDUSTRIAL MACHINERY: HIGH-STRENGTH GEARS, SHAFTS, FASTENERS, SPRINGS AND HEAVILY LOADED COMPONENTS. COMMERCIAL LITERATURE SPECIFICALLY IDENTIFIES APPLICATIONS SUCH AS AIRCRAFT LANDING GEAR, ROCKET MOTOR CASES, DRIVESHAFTS, TORSION SPRINGS, FASTENERS, TOOLING AND HIGH-PERFORMANCE SHAFTING FOR MARAGING GRADES. MIL-S-46850D VS AMS 6512, AMS 6514 AND AMS 6515 THE MOST IMPORTANT COMMERCIAL CROSS-REFERENCES FOR PROCUREMENT ARE GENERALLY: MIL-S-46850D + MARAGING 250 → AMS 6512 / UNS K92890 MIL-S-46850D + MARAGING 300 → AMS 6514 / UNS K93120 MIL-S-46850D + MARAGING 350 → AMS 6515 / MARAGING C350 THIS RELATIONSHIP IS SUPPORTED BY CURRENT COMMERCIAL MATERIAL REFERENCES FROM HIGH-PERFORMANCE-METAL SUPPLIERS. HOWEVER, “EQUIVALENT” SHOULD NOT BE INTERPRETED AS “IDENTICAL IN EVERY REQUIREMENT.” AMS AND MILITARY SPECIFICATIONS MAY DIFFER IN MELTING PRACTICE, PRODUCT FORM, HEAT TREATMENT, TESTING, PERMISSIBLE MANUFACTURING ROUTES AND CERTIFICATION DETAILS. ASTM AND OTHER SPECIFICATION REFERENCES FREQUENTLY ENCOUNTERED RELATED REFERENCES INCLUDE: ASTM A579 GRADE 72 — COMMONLY ASSOCIATED WITH MARAGING 250. ASTM A579 GRADE 73 — COMMONLY ASSOCIATED WITH MARAGING 300. ASTM A538 — FREQUENTLY CITED IN COMMERCIAL MARAGING-STEEL REFERENCES. AMS 6512 — MARAGING 250 BAR/FORGING FAMILY. AMS 6514 — MARAGING 300 BAR/FORGING FAMILY. AMS 6515 — MARAGING 350. BS S162 — COMMONLY ASSOCIATED WITH MARAGING 250. DIN / EN X2NICOMO18-8-5 — COMMONLY ASSOCIATED WITH MARAGING 250. DIN / EN X2NICOMO18-9-5 — COMMONLY ASSOCIATED WITH MARAGING 300. WERKSTOFF 1.6359 — COMMONLY ASSOCIATED WITH MARAGING 250. WERKSTOFF 1.6354 / 1.6358 — ENCOUNTERED WITH MARAGING 300 DEPENDING ON DESIGNATION SYSTEM AND CONDITION. OTHER CATALOGS ALSO LIST DTD 5212, MSRR 6551, MAT 102 AND MIA 101 AMONG MARAGING-STEEL COMPARISON STANDARDS, BUT THESE SHOULD BE TREATED AS SIMILAR OR HISTORICAL/COMMERCIAL COMPARISON REFERENCES, NOT AUTOMATICALLY INTERCHANGEABLE WITH MIL-S-46850D. COMMON NAMES, TRADE NAMES AND SEARCH VARIANTS FOR INTERNATIONAL PROCUREMENT, MIL-S-46850D MATERIAL CAN APPEAR UNDER MANY DIFFERENT SEARCH PHRASES. HIGH-VALUE TERMINOLOGY INCLUDES: MIL-S-46850D ROUND BAR MIL-S-46850D STEEL BAR MIL-S-46850D MARAGING STEEL MIL-S-46850D MARAGING STEEL ROUND BAR 18% NICKEL MARAGING STEEL ROUND BAR 18NI MARAGING STEEL BAR MARAGING STEEL ROUND BAR MARAGING 250 ROUND BAR MARAGING 300 ROUND BAR MARAGING 350 ROUND BAR MARAGING C250 ROUND BAR MARAGING C300 ROUND BAR MARAGING C350 ROUND BAR AMS 6512 ROUND BAR AMS 6514 ROUND BAR AMS 6515 ROUND BAR UNS K92890 ROUND BAR UNS K93120 ROUND BAR UNS S35000 MARAGING BAR VASCOMAX 250 ROUND BAR VASCOMAX 300 ROUND BAR VASCOMAX 350 ROUND BAR UDIMAR 250 BAR UDIMAR 300 BAR HIGH STRENGTH MARAGING STEEL BAR AEROSPACE MARAGING STEEL ROUND BAR MARAGING STEEL SHAFT PRECISION GROUND MARAGING STEEL BAR THESE SEARCH VARIANTS REFLECT THE WAY ENGINEERS, PURCHASING DEPARTMENTS, DISTRIBUTORS, EXPORTERS AND MANUFACTURERS IDENTIFY THE MATERIAL RATHER THAN A SINGLE UNIVERSALLY STANDARDIZED COMMERCIAL NAME. MIL-S-46850D ROUND BAR SUPPLIER AND MANUFACTURER SEARCH INTENT GLOBAL PROCUREMENT SEARCHES FREQUENTLY COMBINE THE MATERIAL SPECIFICATION WITH PRODUCT, LOCATION AND SUPPLY INTENT. HIGH-VALUE KEYWORD STRUCTURES THEREFORE INCLUDE: MIL-S-46850D ROUND BAR MANUFACTURER MIL-S-46850D ROUND BAR SUPPLIER MIL-S-46850D ROUND BAR EXPORTER MIL-S-46850D STEEL BAR MANUFACTURER MIL-S-46850D MARAGING STEEL SUPPLIER MARAGING STEEL ROUND BAR MANUFACTURER MARAGING STEEL ROUND BAR SUPPLIER MARAGING 250 ROUND BAR SUPPLIER MARAGING 300 ROUND BAR MANUFACTURER MARAGING 350 ROUND BAR SUPPLIER AMS 6512 ROUND BAR SUPPLIER AMS 6514 ROUND BAR MANUFACTURER AMS 6515 ROUND BAR EXPORTER UNS K92890 ROUND BAR SUPPLIER UNS K93120 ROUND BAR MANUFACTURER VASCOMAX 300 ROUND BAR SUPPLIER 18NI MARAGING STEEL ROUND BAR MANUFACTURER AEROSPACE GRADE MARAGING STEEL ROUND BAR FOR STRATEGY, BROAD PHRASES SUCH AS “MARAGING STEEL ROUND BAR”, “MARAGING STEEL BAR”, “MARAGING 300 ROUND BAR”, “HIGH STRENGTH STEEL ROUND BAR”, AND “AEROSPACE STEEL ROUND BAR” CAN CAPTURE BROADER SEARCH INTENT, WHILE SPECIFICATION-SPECIFIC TERMS SUCH AS “MIL-S-46850D ROUND BAR” TARGET HIGHLY QUALIFIED TECHNICAL BUYERS. EXACT WORLDWIDE MONTHLY SEARCH VOLUMES ARE PROPRIETARY AND VARY BY PLATFORM AND MARKET. THE KEYWORD ARCHITECTURE ABOVE IS THEREFORE INTENTIONALLY BUILT AROUND COMMERCIALLY PROMINENT, SPECIFICATION-SPECIFIC AND BROAD INDUSTRIAL SEARCH TERMS RATHER THAN UNSUPPORTED NUMERICAL VOLUME CLAIMS. WHY CHOOSE MIL-S-46850D ROUND BAR MANUFACTURING? A PROFESSIONALLY MANUFACTURED MARAGING STEEL ROUND BAR PROVIDES A COMBINATION THAT IS DIFFICULT TO REPRODUCE WITH ORDINARY ALLOY STEEL: VERY HIGH STRENGTH + LOW-CARBON TOUGHNESS + EXCELLENT MACHINABILITY BEFORE AGING + CONTROLLED PRECIPITATION HARDENING + DIMENSIONAL STABILITY + AEROSPACE-GRADE TRACEABILITY. THAT COMBINATION EXPLAINS WHY MARAGING STEELS CONTINUE TO BE SPECIFIED FOR DEMANDING ENGINEERING APPLICATIONS EVEN THOUGH MIL-S-46850D ITSELF IS NOW A LEGACY/INACTIVE-FOR-NEW-DESIGN DOCUMENT. TECHNICAL PROCUREMENT CHECKLIST WHEN PURCHASING MIL-S-46850D ROUND BAR, THE ORDER SHOULD CLEARLY ESTABLISH THE: SPECIFICATION: MIL-S-46850D AND APPLICABLE AMENDMENT/REVISION GRADE: 200, 250, 300 OR 350 KSI CLASS PRODUCT FORM: ROUND BAR DIAMETER AND LENGTH: REQUIRED FINISHED DIMENSIONS CONDITION: SOLUTION TREATED, AGED, ANNEALED OR OTHERWISE SPECIFIED CONDITION MELTING ROUTE: WHERE CONTRACTUALLY REQUIRED HEAT TREATMENT: EXACT APPLICABLE CONDITION AND CERTIFICATION REQUIREMENT INSPECTION: MECHANICAL, HARDNESS, ULTRASONIC AND SURFACE TESTING AS APPLICABLE CERTIFICATION: MATERIAL TEST REPORT / CERTIFICATE OF CONFORMITY TRACEABILITY: HEAT NUMBER AND BATCH IDENTIFICATION SURFACE: HOT FINISHED, PEELED, TURNED, GROUND OR POLISHED PACKAGING: CORROSION PROTECTION AND EXPORT PACKING REQUIREMENTS. CONCLUSION MIL-S-46850D ROUND BAR MANUFACTURING REPRESENTS A MAJOR CATEGORY WITHIN HIGH-PERFORMANCE 18% NICKEL MARAGING STEEL ROUND BAR PRODUCTION. THE SPECIFICATION COVERS 200, 250, 300 AND 350 KSI MARAGING GRADES AND HAS BEEN HISTORICALLY USED FOR DEMANDING AEROSPACE, DEFENSE, TOOLING AND HIGH-STRENGTH ENGINEERING COMPONENTS. FOR CURRENT COMMERCIAL SOURCING, THE MOST IMPORTANT ASSOCIATED IDENTITIES ARE MARAGING 250 / AMS 6512 / UNS K92890, MARAGING 300 / AMS 6514 / UNS K93120, AND MARAGING 350 / AMS 6515, TOGETHER WITH INTERNATIONAL DESIGNATIONS SUCH AS X2NICOMO18-8-5, X2NICOMO18-9-5, 1.6359 AND 1.6354/1.6358, PLUS TRADE NAMES SUCH AS VASCOMAX AND UDIMAR. FOR A MANUFACTURER OR EXPORTER, THE STRONGEST POSITIONING COMBINES THE SPECIFICATION TERM MIL-S-46850D WITH HIGH-INTENT PHRASES SUCH AS MARAGING STEEL ROUND BAR MANUFACTURER, MARAGING STEEL ROUND BAR SUPPLIER, 18NI MARAGING STEEL BAR, MARAGING 250 ROUND BAR, MARAGING 300 ROUND BAR, MARAGING 350 ROUND BAR, AMS 6512 ROUND BAR, AMS 6514 ROUND BAR, AMS 6515 ROUND BAR, UNS K92890 ROUND BAR AND UNS K93120 ROUND BAR.