AMS 6515 ROUND BAR MANUFACTURING: HIGH-STRENGTH MARAGING 350 STEEL FOR AEROSPACE, DEFENSE AND PRECISION ENGINEERING AMS 6515 ROUND BAR IS A PREMIUM MARAGING 350 STEEL SPECIFICATION ENGINEERED FOR EXTREMELY HIGH STRENGTH, HIGH TOUGHNESS, DIMENSIONAL STABILITY, AND RELIABLE MACHINABILITY IN ITS SOLUTION-ANNEALED CONDITION. THE SPECIFICATION COVERS MARAGING STEEL BARS, FORGINGS, TUBING, AND RINGS MADE FROM APPROXIMATELY 18.5% NICKEL, 12% COBALT, 4.9% MOLYBDENUM AND 1.4% TITANIUM, WITH VERY LOW CARBON AND DOUBLE-VACUUM MELTING REQUIREMENTS. FOR GLOBAL BUYERS, AMS 6515 ROUND BAR IS COMMONLY ASSOCIATED WITH MARAGING 350, MARAGING C350, C350, 18NI(350), 18NI-350, VASCOMAX 350 AND UNS K93160. EUROPEAN MATERIAL REFERENCES CAN ALSO APPEAR AS 1.6356 AND X2NICOMOTI18-12; HOWEVER, INTERNATIONAL DESIGNATION SYSTEMS SHOULD BE CHECKED AGAINST THE PURCHASE SPECIFICATION AND MILL CERTIFICATE RATHER THAN ASSUMED INTERCHANGEABLE. WHAT IS AMS 6515 ROUND BAR? AMS 6515 IS A MARAGING STEEL AEROSPACE MATERIAL SPECIFICATION COVERING BARS, FORGINGS, TUBING AND RINGS IN A DOUBLE-VACUUM-MELTED, ANNEALED CONDITION. THE SAE SPECIFICATION IS IDENTIFIED AS “STEEL, MARAGING, BARS, FORGINGS, TUBING, AND RINGS, 18.5NI 12.0CO 4.9MO 1.40TI 0.10AL, DOUBLE VACUUM MELTED, ANNEALED.” UNLIKE CONVENTIONAL HIGH-CARBON ULTRAHIGH-STRENGTH STEELS, MARAGING 350 USES AN ULTRA-LOW-CARBON IRON-NICKEL MARTENSITIC MATRIX THAT IS STRENGTHENED PRIMARILY THROUGH SUBSEQUENT AGING AND PRECIPITATION OF INTERMETALLIC PHASES. THIS PROVIDES A USEFUL COMBINATION OF VERY HIGH STRENGTH, TOUGHNESS AND RELATIVELY LOW DISTORTION DURING HARDENING. AMS 6515 ROUND BAR IS THEREFORE USED WHEN AN APPLICATION NEEDS MORE THAN ORDINARY ALLOY STEEL CAN PROVIDE, PARTICULARLY FOR AEROSPACE STRUCTURES, LANDING GEAR, HIGH-PERFORMANCE SHAFTS, GEARS, FASTENERS, TOOLING, ROCKET AND MISSILE COMPONENTS, AND OTHER HIGHLY LOADED PRECISION PARTS. AMS 6515 MATERIAL IDENTIFICATION AND INTERNATIONAL EQUIVALENTS THE MOST WIDELY ENCOUNTERED NAMES AND DESIGNATION REFERENCES FOR THIS MATERIAL INCLUDE: AMS: AMS 6515 COMMON GRADE: MARAGING 350 COMMON ALTERNATIVE: MARAGING C350 SHORT DESIGNATION: C350 OR C-350 NOMINAL FAMILY DESIGNATION: 18NI(350), 18NI-350 UNS: UNS K93160 IS FREQUENTLY CITED FOR MARAGING 350 ALONGSIDE AMS 6515 IN CURRENT COMMERCIAL LITERATURE. U.S. MILITARY SPECIFICATION: MIL-S-46850 / MIL-S-46850D EUROPEAN/WERKSTOFF REFERENCE: 1.6356 IS CITED BY SPECIALTY-METAL MANUFACTURERS FOR MARAGING 350. EUROPEAN DESIGNATION: X2NICOMOTI18-12 OR CLOSELY RELATED X2NICOMOTI18-12-4 NOMENCLATURE APPEARS IN CROSS-REFERENCE LITERATURE. TRADE NAMES: VASCOMAX 350 / VASCOMAX C350, ALMAR 350 AND OTHER PRODUCER-SPECIFIC C350 DESIGNATIONS ARE ENCOUNTERED COMMERCIALLY. INDIAN INDUSTRY REFERENCE: MDN 350 IS LISTED BY PARMANU DHATU NIGAM WITH MARAGING C350, MIL-S-46850D AND AMS 6515) THERE ARE CONFLICTING SUPPLIER DATABASES REGARDING THE PRECISE UNS AND WERKSTOFF CROSS-REFERENCE FOR MARAGING 350, SO A MANUFACTURER SHOULD ALWAYS VERIFY THE ACTUAL HEAT CHEMISTRY, SPECIFICATION REVISION, AND MATERIAL CERTIFICATE BEFORE DECLARING TWO GRADES TECHNICALLY IDENTICAL. FOR PRODUCTION PROCUREMENT, AMS 6515 SHOULD REMAIN THE CONTROLLING SPECIFICATION WHEN AMS 6515 IS SPECIFIED ON THE DRAWING OR PURCHASE ORDER. RELATED BUT DIFFERENT MARAGING GRADES AMS 6515 SHOULD NOT BE CONFUSED WITH OTHER 18NI MARAGING GRADES. MARAGING 250 IS A LOWER-STRENGTH GRADE GENERALLY ASSOCIATED WITH AMS 6512. MARAGING 300 IS GENERALLY ASSOCIATED WITH AMS 6514. MARAGING 350 CORRESPONDS TO THE HIGHER-STRENGTH C350 GRADE COVERED BY AMS 6515) THIS DISTINCTION MATTERS BECAUSE COBALT AND TITANIUM LEVELS DIFFER BETWEEN GRADES AND DIRECTLY INFLUENCE AGING RESPONSE AND FINAL STRENGTH. AMS 6515 ROUND BAR CHEMICAL COMPOSITION AMS 6515 MARAGING 350 CHEMISTRY IS CHARACTERIZED BY APPROXIMATELY 18–19% NICKEL, 11.5–12.5% COBALT, 4.6–5.2% MOLYBDENUM AND 1.3–1.6% TITANIUM, WITH CARBON LIMITED TO APPROXIMATELY 0.03% MAXIMUM AND CONTROLLED RESIDUAL ELEMENTS. NICKEL PROVIDES THE MARAGING MATRIX AND CONTRIBUTES TO TOUGHNESS AND TRANSFORMATION BEHAVIOR. COBALT PROMOTES THE PRECIPITATION-HARDENING RESPONSE, WHILE MOLYBDENUM AND TITANIUM PARTICIPATE IN THE FORMATION OF STRENGTHENING INTERMETALLIC COMPOUNDS. THE EXTREMELY LOW CARBON CONTENT IS ONE OF THE DEFINING CHARACTERISTICS OF THE MARAGING-STEEL FAMILY. AMS 6515 ROUND BAR MANUFACTURING PROCESS HIGH-QUALITY AMS 6515 ROUND BAR MANUFACTURING STARTS WITH CONTROLLED DOUBLE-VACUUM MELTING. COMMERCIAL DESCRIPTIONS COMMONLY IDENTIFY A SEQUENCE INVOLVING VACUUM INDUCTION MELTING (VIM) FOLLOWED BY VACUUM ARC REMELTING (VAR). THIS PROCESSING ROUTE IS USED TO IMPROVE CHEMICAL HOMOGENEITY AND CLEANLINESS FOR CRITICAL AEROSPACE APPLICATIONS. AFTER MELTING AND REMELTING, THE MATERIAL CAN BE CONVERTED INTO BILLET AND SUBSEQUENTLY PROCESSED BY FORGING, ROLLING, OR OTHER APPROVED HOT-WORKING METHODS TO PRODUCE ROUND BAR. RAW MATERIAL PREPARATION THE FIRST MANUFACTURING STAGE IS SELECTION OF CAREFULLY CONTROLLED VACUUM-MELTED FEEDSTOCK. NICKEL, COBALT, MOLYBDENUM, TITANIUM, ALUMINUM AND IRON ARE BALANCED WITHIN THE APPLICABLE SPECIFICATION LIMITS. TRACE ELEMENTS SUCH AS CARBON, SULFUR AND PHOSPHORUS REQUIRE PARTICULARLY CLOSE CONTROL BECAUSE THE ALLOY IS DESIGNED FOR DEMANDING STRUCTURAL APPLICATIONS. VACUUM INDUCTION MELTING DURING VIM, THE METALLIC CHARGE IS MELTED UNDER VACUUM OR CONTROLLED CONDITIONS TO REDUCE CONTAMINATION AND PERMIT TIGHTER CHEMISTRY CONTROL. THE OBJECTIVE IS A CLEAN, HOMOGENEOUS STARTING MATERIAL SUITABLE FOR THE SUBSEQUENT REMELTING STAGE. VACUUM ARC REMELTING THE VIM ELECTRODE IS THEN REMELTED THROUGH VAR. VAR IS PARTICULARLY IMPORTANT FOR AEROSPACE-GRADE MARAGING STEEL BECAUSE IT HELPS IMPROVE INTERNAL CLEANLINESS AND SOLIDIFICATION QUALITY. HOT FORGING AND BREAKDOWN THE VACUUM-REMELTED BILLET IS HEATED AND FORGED TO BREAK DOWN THE CAST STRUCTURE, REDUCE SEGREGATION AND REFINE THE MICROSTRUCTURE. AMS 6515 ROUND BAR MAY BE PRODUCED THROUGH COMBINATIONS OF HOT FORGING, HOT ROLLING AND SUBSEQUENT FINISHING OPERATIONS, DEPENDING ON DIAMETER, MILL CAPABILITY AND PURCHASE REQUIREMENTS. SOLUTION ANNEALING THE BAR IS SUPPLIED IN THE ANNEALED CONDITION UNDER AMS 6515) IN THE SOLUTION-ANNEALED CONDITION, MARAGING 350 REMAINS SUBSTANTIALLY EASIER TO MACHINE THAN AFTER FINAL AGING. PUBLISHED TECHNICAL DATA COMMONLY DESCRIBES ANNEALED HARDNESS IN APPROXIMATELY THE LOW-TO-MID 30 HRC RANGE, ALTHOUGH THE EXACT REQUIREMENT DEPENDS ON THE APPLICABLE REVISION AND PRODUCT CONDITION. STRAIGHTENING AND DIMENSIONAL CONTROL AFTER HOT WORKING AND HEAT TREATMENT, ROUND BARS UNDERGO STRAIGHTENING AND DIMENSIONAL CORRECTION AS REQUIRED. DIAMETER, OVALITY, STRAIGHTNESS AND SURFACE CONDITION ARE CONTROLLED TO MEET THE APPLICABLE ORDER REQUIREMENTS. MACHINING AND SURFACE FINISHING AMS 6515 ROUND BAR CAN BE SUPPLIED WITH DIFFERENT COMMERCIAL FINISHES, INCLUDING HOT-FINISHED, PEELED, TURNED, GROUND, COLD-FINISHED, POLISHED OR PRECISION-MACHINED SURFACES DEPENDING ON THE REQUESTED PRODUCT FORM. CENTRELESS GRINDING IS PARTICULARLY USEFUL FOR PRECISION SHAFTS, PINS, TOOLING COMPONENTS AND OTHER PARTS WHERE TIGHT DIMENSIONAL CONTROL AND A CLEAN SURFACE ARE IMPORTANT. AMS 6515 AGING AND PRECIPITATION HARDENING ONE OF THE MAJOR ADVANTAGES OF MARAGING 350 ROUND BAR IS THAT FINAL STRENGTH IS DEVELOPED BY AGING RATHER THAN CONVENTIONAL QUENCH HARDENING. AFTER SOLUTION TREATMENT AND MACHINING, THE MATERIAL IS SUBJECTED TO A CONTROLLED AGING CYCLE. PUBLISHED MARAGING 350 DATA COMMONLY PLACES THE AGING TEMPERATURE AROUND 480–510 °C, WITH THE PRECISE CYCLE DETERMINED BY THE APPLICABLE MATERIAL SPECIFICATION, SECTION SIZE, HEAT-TREATMENT PROCEDURE AND ENGINEERING REQUIREMENTS. DURING AGING, STRENGTHENING PRECIPITATES FORM WITHIN THE MARTENSITIC MATRIX. THIS CAN GENERATE TENSILE STRENGTHS ABOVE 2, 300 MPA, WITH PUBLISHED COMMERCIAL DATA AROUND 2, 310 MPA AND HIGHER DEPENDING ON THE EXACT CONDITION AND SPECIFICATION. THE RELATIVELY LOW AGING TEMPERATURE AND LOW-CARBON METALLURGY ARE IMPORTANT ADVANTAGES FOR PRECISION COMPONENTS BECAUSE DISTORTION CAN BE SIGNIFICANTLY LOWER THAN IN CONVENTIONAL THROUGH-HARDENED STEELS. AMS 6515 ROUND BAR MECHANICAL PROPERTIES MARAGING 350 IS RECOGNIZED AS AN ULTRA-HIGH-STRENGTH STEEL. PUBLISHED DATA FOR AGED MATERIAL COMMONLY REPORTS APPROXIMATELY: • TENSILE STRENGTH: AROUND 2, 310 MPA / 335 KSI OR HIGHER • YIELD/PROOF STRENGTH: ABOVE 2, 200 MPA IN TYPICAL PUBLISHED DATA • HARDNESS: APPROXIMATELY 53 HRC AND ABOVE, DEPENDING ON THE SPECIFIED CONDITION • ELONGATION: COMMONLY AROUND 6–8% IN PUBLISHED REFERENCE DATA ACTUAL ACCEPTANCE VALUES MUST BE TAKEN FROM THE APPLICABLE REVISION OF AMS 6515 AND THE MATERIAL TEST REPORT RATHER THAN FROM GENERIC WEB DATASHEETS. WHY MANUFACTURERS CHOOSE AMS 6515 ROUND BAR AMS 6515 MARAGING 350 ROUND BAR OFFERS AN UNUSUAL COMBINATION OF: ULTRA-HIGH TENSILE STRENGTH: SUITABLE FOR HEAVILY LOADED AEROSPACE AND DEFENSE COMPONENTS. HIGH YIELD STRENGTH: VALUABLE WHEN PERMANENT DEFORMATION MUST BE MINIMIZED. EXCELLENT TOUGHNESS: IMPORTANT FOR DYNAMICALLY LOADED AND SAFETY-CRITICAL STRUCTURES. GOOD MACHINABILITY BEFORE AGING: COMPLEX GEOMETRIES CAN BE MACHINED WHILE THE ALLOY REMAINS COMPARATIVELY SOFT. LOW DISTORTION DURING AGING: PARTICULARLY BENEFICIAL FOR CLOSE-TOLERANCE COMPONENTS. HIGH STRENGTH-TO-WEIGHT POTENTIAL: USEFUL FOR AEROSPACE ENGINEERING AND HIGH-PERFORMANCE MECHANICAL SYSTEMS. VACUUM-MELT CLEANLINESS: IMPORTANT FOR DEMANDING APPLICATIONS WHERE INTERNAL QUALITY IS CRITICAL. AMS 6515 ROUND BAR APPLICATIONS AMS 6515 ROUND BAR MANUFACTURING SUPPORTS A WIDE RANGE OF HIGH-PERFORMANCE APPLICATIONS. AEROSPACE LANDING GEAR MARAGING 350 IS USED IN DEMANDING LANDING-GEAR-RELATED COMPONENTS WHERE STRENGTH, TOUGHNESS AND DIMENSIONAL RELIABILITY ARE IMPORTANT. AIRCRAFT SHAFTS AND DRIVE COMPONENTS HIGH-PERFORMANCE SHAFTING BENEFITS FROM THE ALLOY'S COMBINATION OF HIGH TENSILE STRENGTH AND FATIGUE-RESISTANT ENGINEERING POTENTIAL. GEARS AND TRANSMISSION COMPONENTS THE HIGH STRENGTH DEVELOPED AFTER AGING MAKES MARAGING 350 USEFUL IN HEAVILY LOADED PRECISION GEARS AND MECHANICAL TRANSMISSION COMPONENTS. ROCKET AND MISSILE COMPONENTS C350 MARAGING STEEL HAS LONG BEEN ASSOCIATED WITH MISSILE AND ROCKET MOTOR CASES AND OTHER AEROSPACE-DEFENSE HARDWARE. FASTENERS HIGH-STRENGTH BOLTS, STUDS, PINS AND SPECIALIZED AEROSPACE FASTENERS CAN TAKE ADVANTAGE OF THE ALLOY'S EXCEPTIONAL STRENGTH AFTER AGING. TOOLING AND DIES MARAGING STEELS ARE ALSO ATTRACTIVE FOR HIGH-STRENGTH TOOLING, MOLDS AND PRECISION COMPONENTS WHERE DIMENSIONAL STABILITY AND MACHINABILITY ARE BOTH IMPORTANT. TORSION SPRINGS PUBLISHED COMMERCIAL REFERENCES ALSO IDENTIFY MARAGING 350 FOR TORSION SPRINGS AND OTHER HIGHLY LOADED MECHANICAL APPLICATIONS. QUALITY CONTROL FOR AMS 6515 ROUND BAR MANUFACTURING A RELIABLE AMS 6515 ROUND BAR MANUFACTURER SHOULD CONTROL THE PRODUCT THROUGH THE ENTIRE MANUFACTURING CHAIN, FROM VACUUM MELTING TO FINAL INSPECTION. TYPICAL QUALITY-CONTROL PROGRAMS INCLUDE: CHEMICAL ANALYSIS: VERIFICATION OF NICKEL, COBALT, MOLYBDENUM, TITANIUM, ALUMINUM AND RESTRICTED ELEMENTS. MECHANICAL TESTING: TENSILE, YIELD, ELONGATION AND HARDNESS TESTING AS REQUIRED BY THE PURCHASING SPECIFICATION. DIMENSIONAL INSPECTION: DIAMETER, ROUNDNESS, STRAIGHTNESS AND LENGTH. SURFACE INSPECTION: CHECKING FOR LAPS, SEAMS, CRACKS, SCALE AND OTHER IMPERFECTIONS. ULTRASONIC INSPECTION: FREQUENTLY SPECIFIED FOR CRITICAL FORGED OR BAR PRODUCTS WHERE INTERNAL DISCONTINUITIES MUST BE CONTROLLED. METALLURGICAL EXAMINATION: USED WHEN REQUIRED TO EVALUATE GRAIN STRUCTURE, INCLUSIONS AND PROCESSING QUALITY. TRACEABILITY: HEAT NUMBER, MELT ROUTE, PROCESSING HISTORY AND HEAT-TREATMENT RECORDS SHOULD REMAIN TRACEABLE TO THE FINAL BAR. MATERIAL CERTIFICATION: EN 10204 3.1 OR 3.2 DOCUMENTATION CAN BE REQUESTED BY CUSTOMERS DEPENDING ON CONTRACTUAL REQUIREMENTS. AMS 6515 AND MIL-S-46850 AMS 6515 AND MIL-S-46850 ARE CLOSELY ASSOCIATED WITH MARAGING 350/C350. HOWEVER, BUYERS SHOULD DISTINGUISH BETWEEN AN ACTIVE AEROSPACE SPECIFICATION AND HISTORICAL MILITARY SPECIFICATIONS. THE U.S. DEPARTMENT OF DEFENSE ASSIST DATABASE CURRENTLY LISTS MIL-S-46850 AS CANCELED, WITH A CANCELLATION DATE OF JULY 1, 2024, AND STATES THAT FUTURE ACQUISITION SHOULD REFER TO THE APPLICABLE REPLACEMENT INFORMATION. THEREFORE, AN ENGINEERING WEBSITE SHOULD NOT SIMPLY STATE THAT MIL-S-46850 IS AN ACTIVE PROCUREMENT STANDARD. THE CURRENT DRAWING, CONTRACT AND APPLICABLE AMS REVISION SHOULD CONTROL. AMS 6515 VERSUS ASTM, DIN, EN AND ISO REFERENCES A COMMON MISTAKE IS TO LIST EVERY NEARBY STEEL STANDARD AS A DIRECT EQUIVALENT. THAT CAN CREATE TECHNICALLY INCORRECT PROCUREMENT INFORMATION. MARAGING 350 IS ASSOCIATED COMMERCIALLY WITH WERKSTOFF 1.6356 AND EUROPEAN NOMENCLATURE SUCH AS X2NICOMOTI18-12, WHILE SOME DISTRIBUTORS ALSO ADVERTISE ASTM, ISO OR EN STANDARDS FOR MARAGING PRODUCTS GENERALLY. A SPECIFICATION SUCH AS ASTM A538, FOR EXAMPLE, SHOULD NOT AUTOMATICALLY BE REPRESENTED AS AN IDENTICAL SUBSTITUTE FOR AMS 6515 SIMPLY BECAUSE A SUPPLIER PAGE LISTS BOTH NAMES IN A PRODUCT ADVERTISEMENT. MATERIAL EQUIVALENCY SHOULD BE ESTABLISHED FROM THE ACTUAL STANDARD, GRADE, CHEMISTRY, DELIVERY CONDITION AND MECHANICAL REQUIREMENTS. MARAGING 350 BRAND AND TRADE NAMES THE FOLLOWING COMMERCIAL NAMES ARE FREQUENTLY ENCOUNTERED IN INTERNATIONAL MATERIAL SEARCHES: VASCOMAX 350 VASCOMAX C350 ALMAR 350 MARAGING 350 MARAGING C350 C350 C-350 18NI(350) 18NI-350 MS350 TRADE NAMES ARE MANUFACTURER-SPECIFIC COMMERCIAL IDENTIFIERS AND SHOULD NOT REPLACE THE GOVERNING MATERIAL SPECIFICATION ON A TECHNICAL DRAWING. AMS 6515 ROUND BAR SIZES AND FINISHES AMS 6515 ROUND BAR CAN BE MANUFACTURED IN A BROAD RANGE OF DIAMETERS, FROM RELATIVELY SMALL PRECISION BAR TO LARGE FORGED SECTIONS, DEPENDING ON THE MILL AND MANUFACTURING ROUTE. COMMON COMMERCIAL PRODUCT DESCRIPTIONS INCLUDE: MARAGING 350 ROUND BAR AMS 6515 ROUND BAR C350 ROUND BAR 18NI(350) ROUND BAR UNS K93160 ROUND BAR VASCOMAX 350 ROUND BAR MARAGING STEEL BAR MARAGING STEEL ROD MARAGING 350 BRIGHT BAR MARAGING 350 FORGED BAR MARAGING 350 GROUND BAR MARAGING 350 PRECISION BAR FINISHES MAY INCLUDE HOT ROLLED, HOT FORGED, PEELED, TURNED, COLD FINISHED, GROUND AND POLISHED DEPENDING ON THE PURCHASE REQUIREMENT. GLOBAL KEYWORDS FOR AMS 6515 ROUND BAR MANUFACTURING FOR INTERNATIONAL SEARCH VISIBILITY, THE STRONGEST KEYWORD STRATEGY COMBINES THE ALLOY DESIGNATION, PRODUCT FORM, MANUFACTURING INTENT, APPLICATIONS, EQUIVALENT-GRADE TERMINOLOGY AND PURCHASING LANGUAGE. EXACT WORLDWIDE SEARCH-VOLUME NUMBERS ARE NOT PUBLICLY VERIFIABLE FROM THE SOURCES AVAILABLE HERE, SO THESE ARE HIGH-INTENT GLOBAL KEYWORD TARGETS RATHER THAN CLAIMED PROPRIETARY SEARCH-VOLUME RANKINGS. HIGH-VALUE CORE KEYWORDS INCLUDE: AMS 6515 ROUND BAR AMS 6515 ROUND BAR MANUFACTURER AMS 6515 ROUND BAR SUPPLIER AMS 6515 STEEL BAR AMS 6515 MATERIAL AMS 6515 SPECIFICATION AMS 6515 EQUIVALENT AMS 6515 STEEL EQUIVALENT MARAGING 350 ROUND BAR MARAGING 350 STEEL MARAGING 350 BAR MARAGING 350 MANUFACTURER MARAGING 350 SUPPLIER MARAGING 350 STOCKIST MARAGING 350 PRICE MARAGING 350 PROPERTIES MARAGING 350 CHEMICAL COMPOSITION MARAGING 350 HEAT TREATMENT MARAGING 350 MECHANICAL PROPERTIES MARAGING C350 ROUND BAR C350 MARAGING STEEL C350 ROUND BAR 18NI(350) ROUND BAR 18NI MARAGING STEEL UNS K93160 ROUND BAR VASCOMAX 350 ROUND BAR VASCOMAX C350 MARAGING STEEL 350 SUPPLIER HIGH STRENGTH MARAGING STEEL ULTRA HIGH STRENGTH STEEL ROUND BAR AEROSPACE MARAGING STEEL MARAGING STEEL MANUFACTURER MARAGING STEEL EXPORTER MARAGING STEEL SUPPLIER INDIA LONG-TAIL PHRASES INCLUDE AMS 6515 ROUND BAR MANUFACTURING, AMS 6515 MARAGING 350 ROUND BAR MANUFACTURER, MARAGING 350 ROUND BAR EXPORTER, UNS K93160 MARAGING 350 BAR SUPPLIER, VASCOMAX 350 ROUND BAR MANUFACTURER, C350 MARAGING STEEL ROUND BAR SUPPLIER, AND 18NI(350) AEROSPACE STEEL BAR MANUFACTURER. AMS 6515 ROUND BAR MANUFACTURING IN INDIA INDIA HAS AN ESTABLISHED SPECIALTY-STEEL ECOSYSTEM FOR AEROSPACE, DEFENSE AND PRECISION ENGINEERING MATERIALS. PARMANU DHATU NIGAM, FOR EXAMPLE, LISTS MDN 350 / MARAGING C350 AGAINST MIL-S-46850D AND AMS 6515 AND IDENTIFIES FORGED AND HOT-ROLLED BAR FORMS AMONG ITS PRODUCTS. FOR INDIAN BUYERS, SEARCH TERMS SUCH AS AMS 6515 ROUND BAR INDIA, MARAGING 350 ROUND BAR INDIA, C350 ROUND BAR MANUFACTURER, MARAGING STEEL 350 SUPPLIER MUMBAI, VASCOMAX 350 BAR INDIA, AND AMS 6515 AEROSPACE STEEL SUPPLIER CAN CAPTURE BOTH SPECIFICATION-DRIVEN AND COMMERCIAL PURCHASE INTENT. EXPORT-ORIENTED AMS 6515 ROUND BAR MANUFACTURING FOR INTERNATIONAL SUPPLY, MANUFACTURERS SHOULD EMPHASIZE: • FULL HEAT TRACEABILITY • AMS 6515 COMPLIANCE • CURRENT SPECIFICATION REVISION • VACUUM-MELTING ROUTE • CHEMICAL AND MECHANICAL TEST CERTIFICATES • DIMENSIONAL INSPECTION • SURFACE-QUALITY INSPECTION • ULTRASONIC TESTING WHERE SPECIFIED • EN 10204 CERTIFICATION WHEN CONTRACTUALLY REQUESTED • EXPORT-QUALITY PACKAGING • PRECISE IDENTIFICATION OF SOLUTION-ANNEALED VERSUS AGED CONDITION FOR AEROSPACE PROCUREMENT, THE DIFFERENCE BETWEEN MATERIAL IDENTITY, SPECIFICATION COMPLIANCE AND GENERIC GRADE SIMILARITY IS CRITICAL. HOW AMS 6515 ROUND BAR COMPARES WITH CONVENTIONAL HIGH-STRENGTH ALLOY STEEL TRADITIONAL HIGH-STRENGTH ALLOY STEELS OFTEN DEPEND HEAVILY ON CARBON, QUENCHING AND TEMPERING. MARAGING 350 TAKES A DIFFERENT APPROACH: VERY LOW CARBON AND A PRECIPITATION-HARDENING MECHANISM. THIS GIVES AMS 6515 A PARTICULARLY ATTRACTIVE PROCESSING SEQUENCE FOR PRECISION COMPONENTS: MANUFACTURE AND MACHINE IN THE RELATIVELY SOFT SOLUTION-ANNEALED STATE, FOLLOWED BY CONTROLLED AGING TO DEVELOP EXCEPTIONAL STRENGTH. THAT PROCESSING PHILOSOPHY IS ONE OF THE PRINCIPAL REASONS MARAGING 350 REMAINS ATTRACTIVE FOR AEROSPACE, DEFENSE AND HIGH-PERFORMANCE ENGINEERING. FREQUENTLY ASKED QUESTIONS ABOUT AMS 6515 ROUND BAR WHAT IS AMS 6515? AMS 6515 IS A SAE AEROSPACE MATERIAL SPECIFICATION FOR DOUBLE-VACUUM-MELTED, ANNEALED MARAGING STEEL USED IN BARS, FORGINGS, TUBING AND RINGS. WHAT GRADE IS AMS 6515? AMS 6515 IS ASSOCIATED WITH MARAGING 350 / C350, AN APPROXIMATELY 18% NICKEL, COBALT-STRENGTHENED MARAGING STEEL. WHAT IS THE COMMON NAME OF AMS 6515 STEEL? THE MOST COMMON COMMERCIAL DESCRIPTION IS MARAGING 350, WITH MARAGING C350, C350 AND 18NI(350) ALSO WIDELY USED. WHAT IS THE UNS NUMBER FOR MARAGING 350? CURRENT COMMERCIAL REFERENCES FREQUENTLY IDENTIFY MARAGING 350 / AMS 6515 AS UNS K93160. BECAUSE ONLINE CROSS-REFERENCE DATABASES CONTAIN INCONSISTENCIES, PROCUREMENT SHOULD VERIFY THE DESIGNATION AGAINST THE GOVERNING SPECIFICATION AND MTC. IS AMS 6515 THE SAME AS VASCOMAX 350? VASCOMAX 350 IS A COMMERCIAL TRADE NAME ASSOCIATED WITH MARAGING 350, WHILE AMS 6515 IS A MATERIAL SPECIFICATION. THEY SHOULD NOT BE TREATED AS INTERCHANGEABLE LEGAL DESCRIPTIONS WITHOUT CHECKING THE ACTUAL MANUFACTURER'S CERTIFIED MATERIAL. IS AMS 6515 STAINLESS STEEL? NO. AMS 6515 MARAGING 350 IS A MARAGING ALLOY STEEL, NOT A CONVENTIONAL CHROMIUM-BEARING STAINLESS STEEL. ITS PRINCIPAL ALLOYING SYSTEM IS NICKEL-COBALT-MOLYBDENUM-TITANIUM, WITH VERY LOW CARBON. CAN AMS 6515 ROUND BAR BE MACHINED? YES. ONE OF THE IMPORTANT ADVANTAGES OF MARAGING STEEL IS ITS COMPARATIVELY GOOD MACHINABILITY IN THE SOLUTION-ANNEALED CONDITION BEFORE FINAL AGING. WHAT IS AMS 6515 USED FOR? TYPICAL APPLICATIONS INCLUDE LANDING GEAR COMPONENTS, HIGH-PERFORMANCE SHAFTS, GEARS, FASTENERS, MISSILE AND ROCKET MOTOR CASES, TORSION SPRINGS AND SPECIALIZED TOOLING. WHAT IS THE DIFFERENCE BETWEEN AMS 6514 AND AMS 6515? AMS 6514 IS ASSOCIATED WITH MARAGING 300, WHILE AMS 6515 IS ASSOCIATED WITH MARAGING 350. MARAGING 350 USES HIGHER COBALT/TITANIUM LEVELS AND IS DESIGNED FOR HIGHER FINAL STRENGTH. CONCLUSION AMS 6515 ROUND BAR MANUFACTURING IS CENTERED ON THE PRODUCTION OF ULTRA-HIGH-STRENGTH MARAGING 350 STEEL THROUGH TIGHTLY CONTROLLED DOUBLE-VACUUM MELTING, HOT WORKING, SOLUTION TREATMENT, PRECISION FINISHING AND CONTROLLED PRECIPITATION AGING. ITS COMBINATION OF VERY HIGH STRENGTH, TOUGHNESS, MACHINABILITY BEFORE AGING AND RELATIVELY LOW DISTORTION MAKES IT AN IMPORTANT MATERIAL FOR AEROSPACE, DEFENSE, TOOLING AND HIGH-PERFORMANCE MECHANICAL ENGINEERING. FOR GLOBAL PROCUREMENT, THE STRONGEST MATERIAL IDENTITY CLUSTER IS AMS 6515 + MARAGING 350 + MARAGING C350 + C350 + 18NI(350) + UNS K93160 + VASCOMAX 350 + MIL-S-46850, WHILE EUROPEAN REFERENCES SUCH AS 1.6356 AND X2NICOMOTI18-12 SHOULD BE PRESENTED AS CROSS-REFERENCE DESIGNATIONS SUBJECT TO SPECIFICATION VERIFICATION. THE MOST COMMERCIALLY VALUABLE PAGE TARGETS ARE THEREFORE AMS 6515 ROUND BAR MANUFACTURER, AMS 6515 ROUND BAR SUPPLIER, MARAGING 350 ROUND BAR MANUFACTURER, MARAGING 350 STEEL SUPPLIER, C350 ROUND BAR, 18NI(350) ROUND BAR, UNS K93160 ROUND BAR, VASCOMAX 350 ROUND BAR, AMS 6515 EQUIVALENT, MARAGING 350 PROPERTIES, MARAGING 350 CHEMICAL COMPOSITION, AND AMS 6515 ROUND BAR MANUFACTURING. IMPORTANT SPECIFICATION NOTE: SAE AMS 6515 SHOULD BE CHECKED AGAINST THE LATEST CONTROLLED REVISION BEFORE PROCUREMENT. HISTORICAL MIL-S-46850 REFERENCES ARE NOT NECESSARILY CURRENT PROCUREMENT REQUIREMENTS; THE U.S. DLA DATABASE LISTS MIL-S-46850 AS CANCELED EFFECTIVE JULY 1, 2024)