THE ULTIMATE GUIDE TO MAR-M-247 ROUND BAR MANUFACTURING MAR-M-247 ROUND BARS REPRESENT THE PINNACLE OF HIGH-TEMPERATURE METALLURGY. AS A PREMIUM NICKEL-BASED SUPERALLOY, MAR-M-247 (ORIGINALLY DEVELOPED BY PARMANU DHATU NIGAM) IS ENGINEERED TO MAINTAIN EXCEPTIONAL MECHANICAL STRENGTH, CREEP RUPTURE RESISTANCE, AND OXIDATION PROTECTION AT TEMPERATURES SOARING UP TO 1010°C (1850°F). THIS DEFINITIVE TECHNICAL GUIDE DELIVERS A COMPREHENSIVE BREAKDOWN OF THE TRADE NAMES, GLOBAL MANUFACTURING STANDARDS, AND CHEMICAL PROPERTIES THAT DRIVE THE AEROSPACE AND GAS TURBINE INDUSTRIES. GLOBAL NOMENCLATURE, TRADE NAMES & INTERNATIONAL EQUIVALENTS BECAUSE MAR-M-247 IS CRITICAL FOR SEVERE-SERVICE ENVIRONMENTS, IT IS REFERENCED ACROSS THE SUPPLY CHAIN UNDER VARIOUS TRADE NAMES, PROPRIETARY DESIGNATIONS, AND MODIFIED CHEMISTRY VARIATIONS. NOMENCLATURE TYPE | DESIGNATIONS & INDUSTRY EQUIVALENTS ORIGINAL TRADE NAME: MAR-M 247 (MARTIN MARIETTA ALLOY 247) COMMON INDUSTRIAL NAMES: MAR-M247, MAR M 247, MM247, SUPERALLOY 247 COMMERCIAL BRAND EQUIVALENTS: PMET 847, SUPERCAST 247 AEROSPACE & OEM STANDARDS: EMS 55447 (HONEYWELL/GARRETT), PWA 1447, PWA 1489, DMD 9013-32 (PRATT & WHITNEY) CLOSELY RELATED GRADES: RENE 108, MAR-M 246, MTEK MM247 LOW-CARBON DERIVATIVES: MAR-M 247LC, CM 247 LC (DIRECTIONALLY SOLIDIFIED / SINGLE CRYSTAL MODIFICATIONS) MAR-M-247 TECHNICAL SPECIFICATION STANDARDS MANUFACTURING MAR-M-247 ROUND BARS REQUIRES ADHERENCE TO STRICT AEROSPACE AND MATERIAL TEST PROTOCOLS. DUE TO ITS HIGH VOLUME FRACTION OF GAMMA PRIME (GAMMA PRIME) PRECIPITATION HARDENING ELEMENTS (~62%), THE MATERIAL IS TYPICALLY PRODUCED VIA VACUUM INDUCTION MELTING (VIM) FOLLOWED BY INVESTMENT CASTING OR SPECIALIZED POWDER METALLURGY PROCESSING TO ENSURE ABSOLUTE CLEANLINESS. • AERONAUTICAL MATERIAL SPECS (AMS): THOUGH TRADITIONALLY A CASTING ALLOY, PROCESSED BARS AND WIRES CONFORM TO HIGH-INTEGRITY SPECIFICATIONS SUCH AS EMS 55447 AND PWA 1447 / 1489. • DIMENSIONS & TOLERANCES: STANDARD BAR CONFIGURATIONS RANGE FROM 45MM TO 100MM IN DIAMETER, THOUGH PRECISION CUSTOM GROUND DIMENSIONS ARE REGULARLY MANUFACTURED. CHEMICAL COMPOSITION (% BY WEIGHT) THE STRUCTURAL INTEGRITY OF MAR-M-247 HINGES ON A HIGHLY REGULATED ELEMENTAL PROFILE BALANCING SOLID-SOLUTION STRENGTHENING AND GRAIN-BOUNDARY CONTROL: • NICKEL (NI): BALANCE (~59% – 68%) • TUNGSTEN (W): 9.30% – 10.50% (REFRACTORY SOLID-SOLUTION STRENGTHENER) • COBALT (CO): 9.00% – 11.00% (STABILIZES THE AUSTENITIC MATRIX) • CHROMIUM (CR): 8.00% – 8.80% (HIGH-TEMPERATURE OXIDATION RESISTANCE) • ALUMINUM (AL): 5.40% – 5.70% (PRIMARY GAMMA^ PRIME PRECIPITATE FORMER) • TANTALUM (TA): 3.00% (ENHANCES MC CARBIDE STABILITY) • HAFNIUM (HF): 1.50% (IMPROVES GRAIN BOUNDARY DUCTILITY AND COATABILITY) • TITANIUM (TI): 1.00% (GAMMA^PRIME CO-FORMER) • MOLYBDENUM (MO): 0.70% • CARBON (C): 0.06% – 0.15% (CONTROLS GRAIN BOUNDARY CARBIDE FORMATION) • TRACE ELEMENTS: ZIRCONIUM (ZR ~0.05%), BORON (B ~0.015%) KEY MECHANICAL PROPERTIES & HEAT TREATMENT THE EXCEPTIONAL STRENGTH OF MAR-M-247 ROUND BARS RELIES ON PRECISE THERMAL TREATMENTS TO OPTIMIZE GRAIN-BOUNDARY STRUCTURES AND CARBIDER DISTRIBUTIONS: 1) SOLUTION HEAT TREATMENT: TYPICALLY HEATED AT 1121°C TO 1250°C UNDER ARGON ATMOSPHERE GAS FAN COOLING (AR GFC) TO DISSOLVE STRUCTURAL PHASES INTO THE MATRIX. 2) AGING HEAT TREATMENT: A TWO-STEP SEQUENCE CONSISTING OF 982°C FOR 5 HOURS, FOLLOWED BY A SECONDARY STABILIZATION AT 871°C FOR 20 HOURS. • TYPICAL HARDNESS: 38 TO 45 HRC • TENSILE STRENGTH: ≥ 800 N/MM² • MACHINABILITY RATING: 15% TO 45% OF STANDARD CARBON STEELS, REQUIRING RIGID INDEXABLE CARBIDE TOOLINGS. CORE INDUSTRIAL APPLICATIONS GIVEN THEIR EXTREME CREEP AND OXIDATION THRESHOLDS, MAR-M-247 BARS ARE FUNDAMENTALLY DEPLOYED IN CRITICAL ROTARY AND HIGH-STRESS ENVIRONMENTS: • AEROSPACE PROPULSION: HIGH-PRESSURE TURBINE BLADES, NOZZLE GUIDE VANES, AND AIRCRAFT COMBUSTOR PARTS. • POWER GENERATION: INDUSTRIAL GAS TURBINE COMPONENTS, INTEGRAL ROTORS, AND STRUCTURAL STATORS. • AUTOMOTIVE ENGINEERING: HIGH-PERFORMANCE TURBOCHARGER ROTORS AND TURBINE WHEELS. IF YOU ARE SOURCING THIS ALLOY OR OPTIMIZING YOUR MANUFACTURING PROCESS, LET ME KNOW: • WHAT IS THE EXACT DIAMETER OR CUSTOM FORM FACTOR YOU REQUIRE? • WHAT ARE YOUR TARGET OPERATING TEMPERATURES AND STRESS ENVIRONMENTS? • DO YOU REQUIRE STANDARD POLYCRYSTALLINE MAR-M-247 OR A LOW-CARBON (LC) VARIANT? MAR-M-247 ROUND BAR · MAR-M247 ROUND BAR · MAR M 247 BAR · MAR-M-247 ROD · NICKEL ALLOY ROUND BAR · NICKEL BASED SUPERALLOY · HIGH TEMPERATURE ALLOY · AEROSPACE SUPERALLOY · TURBINE BLADE MATERIAL · MAR-M247 SPECIFICATION · MAR-M247 EQUIVALENT · MAR-M247 MANUFACTURER · MAR-M247 SUPPLIER · MAR-M247 ASTM · MAR-M247 AMS · MAR-M247 UNS · MAR-M247 MECHANICAL PROPERTIES · MAR-M247 CHEMICAL COMPOSITION