AMS 5401 ROUND BAR MANUFACTURING: THE COMPLETE GUIDE TO NICKEL ALLOY 625, UNS N06625, INCONEL 625, 2.4856, ASTM B446 & GLOBAL EQUIVALENTS IMPORTANT TECHNICAL CLARIFICATION: AMS 5401 IS NOT A ROUND-BAR SPECIFICATION. SAE AMS 5401 SPECIFICALLY COVERS VACUUM-MELTED, VACUUM-CAST INVESTMENT CASTINGS OF A CORROSION- AND HEAT-RESISTANT NICKEL ALLOY CONTAINING APPROXIMATELY 62% NI, 21.5% CR, 9% MO AND 3.6% CB/NB+TA. THE CURRENT SAE LISTING IS AMS 5401C, REAFFIRMED MAY 16, 2023) IF THE INTENDED PRODUCT IS AMS 5401-EQUIVALENT ROUND BAR, THE TECHNICALLY APPROPRIATE BAR SPECIFICATIONS SHOULD NORMALLY BE EVALUATED AGAINST UNS N06625 / ALLOY 625, PARTICULARLY ASTM B446 AND AMS 5666, RATHER THAN CLAIMING THAT A ROUND BAR ITSELF IS MANUFACTURED 'TO AMS 5401.' ASTM B446 SPECIFICALLY COVERS UNS N06625 HOT-WORKED/COLD-WORKED ROD AND BAR. AMS 5401 ROUND BAR MANUFACTURING – GLOBAL GUIDE TO ALLOY 625 / UNS N06625 / 2.4856 AMS 5401, NICKEL ALLOY 625, UNS N06625, INCONEL 625, ALLOY 625, 2.4856, AND NICR22MO9NB ARE CLOSELY RELATED SEARCH AND PURCHASING TERMS, BUT THEY SHOULD NOT AUTOMATICALLY BE TREATED AS INTERCHANGEABLE SPECIFICATIONS. SAE DESCRIBES AMS 5401 AS A SPECIFICATION FOR INVESTMENT CASTINGS, VACUUM MELTED AND VACUUM CAST, INTENDED FOR CORROSION- AND HEAT-RESISTANT APPLICATIONS. FOR CUSTOMERS SEARCHING SPECIFICALLY FOR AMS 5401 ROUND BAR, THE COMMERCIAL MATERIAL THEY OFTEN MEAN IS ALLOY 625 / UNS N06625 ROUND BAR, WHICH IS AVAILABLE UNDER DEDICATED BAR SPECIFICATIONS SUCH AS AMS 5666 AND ASTM B446) THIS DISTINCTION IS PARTICULARLY IMPORTANT FOR AEROSPACE, OIL AND GAS, CHEMICAL PROCESSING, MARINE, POWER GENERATION AND OTHER APPLICATIONS WHERE THE MATERIAL CERTIFICATE MUST MATCH THE PURCHASE SPECIFICATION. WHAT IS AMS 5401? AMS 5401 IS AN SAE AEROSPACE MATERIAL SPECIFICATION FOR: NICKEL ALLOY, CORROSION- AND HEAT-RESISTANT, INVESTMENT CASTINGS — 62NI-21.5CR-9.0MO-3.6CB (NB), VACUUM MELTED, VACUUM CAST, AS CAST. THE SPECIFICATION COVERS INVESTMENT CASTINGS, NOT ROLLED OR FORGED ROUND BAR. SAE RECORDS THE ORIGINAL SPECIFICATION AS ISSUED IN 1980, WITH REVISIONS INCLUDING AMS 5401B AND THE CURRENT AMS 5401C REVISION/REAFFIRMATION HISTORY. THE ALLOY IS ASSOCIATED WITH UNS N06625, WIDELY RECOGNIZED COMMERCIALLY AS NICKEL ALLOY 625 / ALLOY 625 / INCONEL 625) INDEPENDENT MATERIALS REFERENCES IDENTIFY UNS N06625 AND 2.4856 AS CORRESPONDING DESIGNATIONS FOR ALLOY 625) KEY POINT FOR BUYERS THERE ARE THEREFORE TWO DIFFERENT PROCUREMENT SCENARIOS: REQUIREMEN INVESTMENT CASTING APPROPRIATE SPECIFICATION FAMILY: AMS 5401 NICKEL ALLOY 625 ROUND BAR APPROPRIATE SPECIFICATION FAMILY: AMS 5666 / ASTM B446 NICKEL ALLOY 625 FORGING APPROPRIATE SPECIFICATION FAMILY: AMS 5666 / ASTM B564 NICKEL ALLOY 625 PLATE/SHEET APPROPRIATE SPECIFICATION FAMILY: AMS 5599 / ASTM B443 NICKEL ALLOY 625 SEAMLESS TUBE/PIPE APPROPRIATE SPECIFICATION FAMILY: ASTM B444 FAMILY NICKEL ALLOY 625 WELDED TUBE APPROPRIATE SPECIFICATION FAMILY: AMS 5581 / ASTM B704 FAMILY THESE PRODUCT-FORM DISTINCTIONS MATTER BECAUSE MECHANICAL REQUIREMENTS, PROCESSING ROUTES, HEAT TREATMENT AND INSPECTION REQUIREMENTS VARY BY STANDARD. ALLOY 625 / UNS N06625 ROUND BAR FOR SEARCHES SUCH AS: • AMS 5401 ROUND BAR • AMS 5401 BAR • AMS 5401 EQUIVALENT ROUND BAR • NICKEL ALLOY 625 ROUND BAR • INCONEL 625 ROUND BAR • UNS N06625 ROUND BAR • ALLOY 625 BAR • 2.4856 ROUND BAR • NICR22MO9NB ROUND BAR • ASTM B446 ROUND BAR • AMS 5666 BAR THE UNDERLYING COMMERCIAL MATERIAL IS FREQUENTLY ALLOY 625 / UNS N06625. ASTM B446 IS SPECIFICALLY A ROD-AND-BAR SPECIFICATION COVERING UNS N06625 AND STATES REQUIREMENTS CONCERNING CHEMICAL COMPOSITION, HEAT TREATMENT, TENSILE PROPERTIES AND DIMENSIONS. INTERNATIONAL EQUIVALENTS AND MATERIAL DESIGNATIONS THE FOLLOWING ARE THE MAJOR INTERNATIONAL DESIGNATIONS AND COMMERCIALLY ENCOUNTERED NAMES FOR ALLOY 625: SAE AEROSPACE: AMS 5401 — INVESTMENT CASTINGS SAE AEROSPACE: AMS 5666 — BAR/FORGING APPLICATIONS UNS: N06625 ALLOY DESIGNATION: ALLOY 625 COMMERCIAL DESIGNATION: NICKEL ALLOY 625 EN MATERIAL NUMBER: 2.4856 EN DESIGNATION: NICR22MO9NB DIN: 2.4856 / NICR22MO9NB-RELATED SPECIFICATIONS ASTM BAR: ASTM B446 ASTM FORGING: ASTM B564 ASTM PLATE/SHEET: ASTM B443 ASME BAR: ASME SB446 ASME FORGING: ASME SB564 ASME PLATE: ASME SB443 NACE / ISO APPLICATIONS: NACE MR0175 / ISO 15156 WHERE APPLICABLE JAPANESE DESIGNATION: NCF 625 CHINESE DESIGNATION: GH3625 PROPRIETARY/COMMERCIAL: INCONEL 625 OTHER TRADE NAME: NICROFER 6020 BÖHLER DESIGNATION: L625 PUBLISHED INDUSTRY REFERENCES IDENTIFY 2.4856, NICR22MO9NB AND UNS N06625 AS ALLOY 625 DESIGNATIONS AND LIST ASTM B446/B564, AMS 5666 AND OTHER RELATED STANDARDS. DO NOT TREAT EVERY DESIGNATION ABOVE AS AN AUTOMATIC ONE-TO-ONE SPECIFICATION EQUIVALENT. PRODUCT FORM, HEAT TREATMENT, EDITION OF THE STANDARD AND CERTIFICATION REQUIREMENTS MUST BE CHECKED. COMMON NAMES AND TRADE NAMES GLOBAL BUYERS MAY SEARCH FOR THE MATERIAL UNDER SEVERAL DIFFERENT NAMES. COMMON MATERIAL NAMES • ALLOY 625 • NICKEL ALLOY 625 • NICKEL-CHROMIUM-MOLYBDENUM-NIOBIUM ALLOY • NI-CR-MO-NB ALLOY • NICKEL-BASED SUPERALLOY 625 • NICKEL CORROSION-RESISTANT ALLOY 625 • HIGH-TEMPERATURE NICKEL ALLOY 625 • CORROSION-RESISTANT NICKEL ALLOY • NICKEL ALLOY ROUND BAR • NICKEL ALLOY BAR • SUPERALLOY ROUND BAR COMMERCIAL/TRADE NAMES INCONEL 625 IS THE BEST-KNOWN PROPRIETARY TRADE NAME ASSOCIATED WITH ALLOY 625) OTHER COMMERCIAL DESIGNATIONS INCLUDE NICROFER 6020, WHILE BÖHLER LISTS L625) 'IN-625' IS ALSO USED COMMERCIALLY IN THE VACUUM-CASTING INDUSTRY; FOR EXAMPLE, A CASTING SUPPLIER LISTS IN-625 — AMS 5401) CHEMICAL COMPOSITION OF ALLOY 625 TYPICAL SPECIFICATION CHEMISTRY FOR UNS N06625 INCLUDES: ELEMENT TYPICAL SPECIFICATION RANGE/LIMIT, WT.% NICKEL ≥ 58.0 CHROMIUM 20.0–23.0 MOLYBDENUM 8.0–10.0 NIOBIUM + TANTALUM 3.15–4.15 IRON ≤ 5.0 CARBON ≤ 0.10 MANGANESE ≤ 0.50 SILICON ≤ 0.50 COBALT ≤ 1.0 ALUMINUM ≤ 0.40 TITANIUM ≤ 0.40 PHOSPHORUS ≤ 0.015 SULFUR ≤ 0.015 THESE VALUES ARE CONSISTENT WITH PUBLISHED ALLOY 625 MATERIAL DATA. THE COMBINATION OF NICKEL, CHROMIUM AND MOLYBDENUM, TOGETHER WITH NIOBIUM, PROVIDES ALLOY 625 WITH ITS CHARACTERISTIC RESISTANCE TO CORROSION AND HIGH-TEMPERATURE ENVIRONMENTS. AMS 5401 MANUFACTURING PROCESS BECAUSE AMS 5401 IS AN INVESTMENT-CASTING SPECIFICATION, ITS MANUFACTURING ROUTE DIFFERS SUBSTANTIALLY FROM ROUND-BAR MANUFACTURING. 1) RAW MATERIAL SELECTION THE MANUFACTURER STARTS WITH CONTROLLED NICKEL-ALLOY CHARGE MATERIALS MEETING THE REQUIRED CHEMISTRY. MATERIAL TRACEABILITY IS ESSENTIAL BECAUSE AEROSPACE AND CRITICAL INDUSTRIAL APPLICATIONS CAN REQUIRE COMPLETE HEAT IDENTIFICATION FROM MELT THROUGH FINAL INSPECTION. 2) VACUUM MELTING AMS 5401 CALLS FOR THE ALLOY TO BE VACUUM MELTED. VACUUM MELTING IS USED TO CONTROL CONTAMINATION AND UNWANTED GASES AND TO ACHIEVE THE REQUIRED CHEMISTRY AND METALLURGICAL CLEANLINESS. 3) INVESTMENT CASTING THE MOLTEN ALLOY IS INTRODUCED INTO AN INVESTMENT-CASTING MOLD. THE INVESTMENT-CASTING ROUTE PERMITS COMPLEX NEAR-NET-SHAPE COMPONENTS AND CAN REDUCE MACHINING REQUIREMENTS FOR GEOMETRICALLY COMPLICATED PARTS. 4) VACUUM CASTING THE AMS 5401 MATERIAL IS SPECIFIED AS VACUUM CAST, PROVIDING CONTROLLED CASTING CONDITIONS APPROPRIATE TO THE NICKEL-BASED ALLOY. 5) SOLIDIFICATION CONTROLLED SOLIDIFICATION IS ESSENTIAL BECAUSE NICKEL SUPERALLOY CASTINGS CAN BE SENSITIVE TO: • SHRINKAGE • POROSITY • INCLUSIONS • SEGREGATION • HOT CRACKING • SURFACE DEFECTS • DIMENSIONAL VARIATION 6) KNOCKOUT AND CLEANING AFTER SOLIDIFICATION, THE CERAMIC INVESTMENT IS REMOVED AND THE CASTING IS CLEANED. GATE AND RISER MATERIAL IS REMOVED BEFORE SUBSEQUENT INSPECTION AND FINISHING. 7) HEAT TREATMENT / CONDITION CONTROL THE APPLICABLE AMS SPECIFICATION AND PURCHASE ORDER DETERMINE THE REQUIRED CONDITION AND PROCESSING. A MANUFACTURER SHOULD NOT SUBSTITUTE A GENERIC ALLOY 625 HEAT-TREATMENT SCHEDULE FOR THE EXACT REQUIREMENTS OF THE GOVERNING SPECIFICATION. HOW ALLOY 625 ROUND BAR IS MANUFACTURED IF THE ACTUAL REQUIREMENT IS ALLOY 625 / UNS N06625 ROUND BAR, THE MANUFACTURING ROUTE IS DIFFERENT. TYPICAL INDUSTRIAL ROUTE VACUUM MELTING → INGOT → HOMOGENIZATION → HOT WORKING → FORGING/ROLLING → ANNEALING OR SOLUTION TREATMENT → DESCALING → STRAIGHTENING → PEELING/GRINDING/DRAWING → ULTRASONIC/OTHER NDT AS REQUIRED → DIMENSIONAL INSPECTION → CERTIFICATION DEPENDING ON DIAMETER AND PRODUCT CONDITION, MANUFACTURERS MAY USE: • HOT FORGING • ROTARY FORGING • HOT ROLLING • COLD DRAWING • CENTERLESS GRINDING • PEELING • PRECISION MACHINING ASTM B446 SPECIFICALLY ADDRESSES HOT-WORKED AND COLD-WORKED ROD/BAR FORMS AND INCLUDES DIMENSIONAL AND MECHANICAL-PROPERTY REQUIREMENTS. AMS 5666 VS AMS 5401 THIS IS ONE OF THE MOST IMPORTANT DISTINCTIONS FOR CONTENT AND TECHNICAL PURCHASING. AMS 5401 PRODUCT: INVESTMENT CASTING PROCESS: VACUUM MELTED / VACUUM CAST CONDITION: AS-CAST SPECIFICATION APPLICATION: CORROSION- AND HEAT-RESISTANT CAST COMPONENTS AMS 5666 PRODUCT: ALLOY 625 BAR/FORGING PRODUCT FAMILY MATERIAL: UNS N06625 TYPICAL SEARCH: INCONEL 625 BAR, ALLOY 625 BAR, AMS 5666 ROUND BAR INDUSTRY MATERIAL REFERENCES LIST AMS 5666 FOR ALLOY 625 BAR AND FORGINGS, WHILE AMS 5401 IS ASSOCIATED WITH INVESTMENT CASTINGS. THEREFORE, A WEBSITE SHOULD NOT CLAIM THAT AN AMS 5401 ROUND BAR IS AUTOMATICALLY COMPLIANT WITH AMS 5401 UNLESS THE SUPPLIED PRODUCT AND CERTIFICATION GENUINELY SATISFY THE SPECIFICATION. ASTM B446 ALLOY 625 ROUND BAR FOR ROUND BAR PURCHASING, ASTM B446 IS ONE OF THE MOST IMPORTANT STANDARDS. THE CURRENT ASTM LISTING DESCRIBES B446 AS COVERING NICKEL-CHROMIUM-MOLYBDENUM-NIOBIUM ALLOY UNS N06625 IN HOT-WORKED AND COLD-WORKED ROD/BAR FORMS. IT ALSO ADDRESSES CHEMISTRY, HEAT TREATMENT, TENSILE PROPERTIES AND DIMENSIONS SUCH AS DIAMETER, LENGTH AND STRAIGHTNESS. ASTM B446 INCLUDES DIFFERENT CONDITIONS/GRADES FOR UNS N06625, INCLUDING ANNEALED AND SOLUTION-ANNEALED MATERIAL. THIS MAKES ASTM B446 A MUCH MORE APPROPRIATE TECHNICAL LANDING PAGE TARGET FOR: 'ALLOY 625 ROUND BAR MANUFACTURER' THAN USING AMS 5401 ALONE. MECHANICAL PROPERTIES PUBLISHED ALLOY 625 DATA VARIES ACCORDING TO PRODUCT FORM AND CONDITION, SO MECHANICAL VALUES SHOULD ALWAYS BE TAKEN FROM THE GOVERNING SPECIFICATION AND MATERIAL CERTIFICATE. TYPICAL PUBLISHED DATA FOR ALLOY 625 INCLUDE TENSILE STRENGTHS IN THE GENERAL RANGE OF APPROXIMATELY 760 MPA AND ABOVE, WITH YIELD STRENGTH AND ELONGATION DEPENDING ON CONDITION AND PRODUCT STANDARD. FOR EXAMPLE, ASTM B446 DISTINGUISHES ANNEALED AND SOLUTION-ANNEALED CONDITIONS BECAUSE SERVICE REQUIREMENTS CAN DIFFER. FOR ENGINEERING PROCUREMENT, THE CORRECT APPROACH IS: SPECIFICATION → PRODUCT FORM → GRADE/CONDITION → SIZE → REQUIRED TESTS → CERTIFICATE RATHER THAN SELECTING A MECHANICAL-PROPERTY NUMBER FROM A GENERIC ALLOY 625 DATASHEET. CORROSION RESISTANCE ALLOY 625 IS WIDELY SELECTED FOR SEVERE CORROSIVE ENVIRONMENTS BECAUSE OF ITS COMBINATION OF: • CHROMIUM • MOLYBDENUM • NICKEL • NIOBIUM PUBLISHED MATERIALS INFORMATION DESCRIBES STRONG RESISTANCE TO PITTING, CREVICE CORROSION AND CORROSION CRACKING, TOGETHER WITH RESISTANCE TO A BROAD RANGE OF MINERAL AND ORGANIC ACIDS. THIS MAKES ALLOY 625 ATTRACTIVE FOR: • OFFSHORE EQUIPMENT • MARINE SYSTEMS • CHEMICAL PROCESSING • OIL AND GAS • POLLUTION-CONTROL EQUIPMENT • HEAT EXCHANGERS • HIGH-PRESSURE EQUIPMENT • AEROSPACE COMPONENTS • POWER-GENERATION SYSTEMS HIGH-TEMPERATURE PERFORMANCE ALLOY 625 IS ALSO USED WHERE HIGH-TEMPERATURE STRENGTH AND OXIDATION RESISTANCE ARE REQUIRED. THE HISTORICAL AMS 5401 APPLICATION DESCRIPTION IDENTIFIES CASTINGS FOR STRUCTURAL APPLICATIONS REQUIRING MODERATE STRENGTH TO APPROXIMATELY 870°C, WITH OXIDATION AND CORROSION RESISTANCE APPLICATIONS EXTENDING TO APPROXIMATELY 980°C. THESE FIGURES SHOULD NOT BE INTERPRETED AS A UNIVERSAL CONTINUOUS-USE TEMPERATURE FOR EVERY ALLOY 625 PRODUCT. ACTUAL ALLOWABLE SERVICE TEMPERATURE DEPENDS ON: • STRESS • ENVIRONMENT • EXPOSURE TIME • PRODUCT FORM • HEAT TREATMENT • DESIGN CODE • OXIDATION CONDITIONS • CREEP REQUIREMENTS APPLICATIONS OF ALLOY 625 ROUND BAR ALLOY 625 ROUND BAR IS COMMONLY USED FOR MANUFACTURING: • SHAFTS • PINS • FASTENERS • STUDS • BOLTS • VALVE COMPONENTS • PUMP COMPONENTS • MACHINED FITTINGS • AEROSPACE HARDWARE • MARINE COMPONENTS • CHEMICAL-PROCESSING COMPONENTS • OIL AND GAS EQUIPMENT • OFFSHORE COMPONENTS • HIGH-PRESSURE COMPONENTS • HEAT-RESISTANT MACHINED PARTS INDUSTRY REFERENCES LIST ALLOY 625 FOR AEROSPACE, POWER GENERATION, CHEMICAL PROCESSING, OIL AND GAS, VALVES, PUMPS AND HIGH-PRESSURE COMPONENTS. OIL & GAS AND NACE APPLICATIONS ALLOY 625 IS PARTICULARLY RELEVANT TO DEMANDING OIL-AND-GAS ENVIRONMENTS. DEPENDING ON THE APPLICATION, CUSTOMER SPECIFICATIONS CAN INVOKE: • NACE MR0175 • ISO 15156 • NACE MR0103 • ISO 17945 THESE STANDARDS SHOULD NOT BE PRESENTED AS AUTOMATIC MATERIAL EQUIVALENCIES. RATHER, THEY ADDRESS MATERIAL SUITABILITY UNDER SPECIFIED SERVICE ENVIRONMENTS AND CONDITIONS. PUBLISHED ALLOY 625 REFERENCES LIST NACE MR0175/ISO 15156 AND RELATED REQUIREMENTS FOR APPLICABLE APPLICATIONS. GLOBAL STANDARDS REFERENCE GUIDE STANDARD TYPICAL RELEVANCE TO ALLOY 625 SAE AMS 5401: INVESTMENT CASTINGS SAE AMS 5666: BAR / FORGING PRODUCT FAMILY ASTM B446: ROD AND BAR ASTM B443: PLATE, SHEET AND STRIP ASTM B564: FORGINGS ASTM B444: SEAMLESS PIPE/TUBE ASTM B705: WELDED PIPE ASTM B704: WELDED TUBE ASTM B366: FITTINGS ASME SB446: PRESSURE-VESSEL/CODE EQUIVALENT OF B446 WHERE ADOPTED ASME SB443: PLATE/SHEET ASME SB564: FORGINGS UNS N06625: UNIFIED MATERIAL DESIGNATION EN 10095: HEAT-RESISTANT NICKEL ALLOY DESIGNATION CONTEXT DIN 17744 / DIN 17752: NICKEL ALLOY PRODUCT SPECIFICATIONS VDTÜV 499: GERMAN TECHNICAL APPROVAL/DATA CONTEXT NACE MR0175 / ISO 15156: OIL & GAS SOUR-SERVICE MATERIAL REQUIREMENTS NACE MR0103 / ISO 17945: REFINERY SOUR-SERVICE APPLICATIONS PUBLISHED ALLOY 625 SUPPLIER/MANUFACTURER REFERENCES IDENTIFY MANY OF THESE STANDARDS FOR THE CORRESPONDING PRODUCT FORMS. INTERNATIONAL EQUIVALENTS: USE WITH CARE SOME MATERIAL DATABASES IDENTIFY THE FOLLOWING AS EQUIVALENT OR CLOSELY CORRESPONDING MATERIALS: • UNS N06625 • ASTM A494 CW6MC • ASTM A494 N06625 • ACI CW6MC • INCONEL 625 • MTEK 625 • CW6MC TOTAL MATERIA IDENTIFIES UNS N06625 AS THE OFFICIAL EQUIVALENCE AND LISTS A494 CW6MC, A494 N06625 AND SEVERAL PROPRIETARY MATERIALS AS IMPLICIT EQUIVALENCES. HOWEVER, EQUIVALENT CHEMISTRY DOES NOT AUTOMATICALLY MEAN EQUIVALENT CERTIFICATION OR PRODUCT-FORM COMPLIANCE. A PROCUREMENT DOCUMENT SHOULD THEREFORE STATE THE EXACT REQUIRED STANDARD, GRADE, CONDITION AND TESTING REQUIREMENTS. QUALITY CONTROL FOR ALLOY 625 ROUND BAR A PROFESSIONAL ALLOY 625 ROUND-BAR MANUFACTURING PROGRAM SHOULD INCLUDE APPROPRIATE CONTROLS FOR: CHEMICAL ANALYSIS CONFIRM: • NI • CR • MO • NB + TA • FE • C • MN • SI • CO • AL • TI • P • S MECHANICAL TESTING DEPENDING ON THE APPLICABLE STANDARD: • TENSILE STRENGTH • YIELD STRENGTH • ELONGATION • REDUCTION OF AREA • HARDNESS DIMENSIONAL INSPECTION CHECK: • OUTSIDE DIAMETER • DIAMETER TOLERANCE • STRAIGHTNESS • LENGTH • SURFACE CONDITION • ROUNDNESS WHERE SPECIFIED ASTM B446 EXPLICITLY IDENTIFIES DIMENSIONAL CHARACTERISTICS AND MECHANICAL TESTING AMONG ITS REQUIREMENTS. NONDESTRUCTIVE TESTING DEPENDING ON PURCHASE REQUIREMENTS: • ULTRASONIC TESTING • EDDY-CURRENT TESTING • LIQUID PENETRANT TESTING • VISUAL INSPECTION THE EXACT NDT METHOD AND ACCEPTANCE CRITERIA SHOULD BE SPECIFIED RATHER THAN ASSUMED. MATERIAL CERTIFICATION FOR AEROSPACE AND CRITICAL ENGINEERING APPLICATIONS, CUSTOMERS MAY REQUEST: • MATERIAL TEST CERTIFICATE • MILL TEST CERTIFICATE • MTC • MTR • CERTIFICATE OF ANALYSIS • EN 10204 3.1 CERTIFICATE • EN 10204 3.2 CERTIFICATE • HEAT NUMBER TRACEABILITY • CHEMICAL ANALYSIS • TENSILE TEST RESULTS • HARDNESS RESULTS • HEAT-TREATMENT RECORDS • DIMENSIONAL INSPECTION REPORT • NDT REPORT AN INDUSTRY SUPPLIER REFERENCE NOTES EN 10204/3.1 CERTIFICATION FOR ALLOY 625 PRODUCTS. SURFACE FINISHES FOR ALLOY 625 ROUND BAR DEPENDING ON THE MANUFACTURING ROUTE AND CUSTOMER REQUIREMENTS, ALLOY 625 BAR CAN BE SUPPLIED AS: • HOT FINISHED • COLD FINISHED • PEELED • CENTERLESS GROUND • POLISHED • BRIGHT FINISHED • MACHINED • PRECISION GROUND FOR PRECISION-MACHINED COMPONENTS, CENTERLESS GRINDING OR PEELING CAN PROVIDE A CONTROLLED SURFACE SUITABLE FOR SUBSEQUENT MACHINING. WHY ALLOY 625 IS DIFFICULT TO MACHINE NICKEL-BASED ALLOYS ARE GENERALLY MORE DEMANDING TO MACHINE THAN CONVENTIONAL CARBON AND STAINLESS STEELS. ALLOY 625'S HIGH STRENGTH AND WORK-HARDENING BEHAVIOR CAN RESULT IN: • RAPID TOOL WEAR • HEAT GENERATION • WORK HARDENING • REDUCED CUTTING-TOOL LIFE • VIBRATION • SURFACE DAMAGE IF PARAMETERS ARE POORLY SELECTED THEREFORE, MACHINING STRATEGY SHOULD ACCOUNT FOR: • RIGID FIXTURING • SUITABLE CARBIDE/CERAMIC TOOLING • CONTROLLED CUTTING SPEED • ADEQUATE FEED • HIGH-PRESSURE COOLANT WHERE APPROPRIATE • AVOIDANCE OF REPEATED RUBBING • PROPER CHIP CONTROL THE FINAL MACHINING PARAMETERS SHOULD BE DEVELOPED FOR THE PARTICULAR BAR CONDITION, DIAMETER, MACHINE AND TOOLING SYSTEM. AMS 5401 VS INCONEL 625 VS UNS N06625 A USEFUL WAY TO EXPLAIN THE TERMINOLOGY IS: AMS 5401 = SPECIFICATION FOR A PARTICULAR INVESTMENT-CAST PRODUCT UNS N06625 = MATERIAL IDENTIFICATION ALLOY 625 = ALLOY DESIGNATION INCONEL 625 = PROPRIETARY TRADE NAME 2.4856 = EUROPEAN MATERIAL NUMBER NICR22MO9NB = EUROPEAN ALLOY DESIGNATION ASTM B446 = ROD/BAR PRODUCT SPECIFICATION AMS 5666 = AEROSPACE BAR/FORGING SPECIFICATION THIS TERMINOLOGY FRAMEWORK HELPS PREVENT ONE OF THE MOST COMMON ERRORS IN ONLINE NICKEL-ALLOY PRODUCT DESCRIPTIONS: USING A MATERIAL DESIGNATION AS THOUGH IT WERE A PRODUCT-FORM SPECIFICATION. HIGH-VOLUME GLOBAL KEYWORD STRATEGY THERE IS NO PUBLIC, AUTHORITATIVE WORLDWIDE DATABASE THAT PROVIDES EXACT GOOGLE SEARCH VOLUME FOR EVERY METALLURGICAL KEYWORD. SEARCH-VOLUME PLATFORMS ALSO PROVIDE ESTIMATES RATHER THAN UNIVERSAL ACTUAL SEARCH COUNTS. ACCORDINGLY, THE KEYWORD STRATEGY BELOW IS BASED ON HIGH-INTENT GLOBAL SEARCH TERMINOLOGY, ESTABLISHED PRODUCT NAMING CONVENTIONS, SPECIFICATION SEARCHES AND COMMERCIALLY RELEVANT QUERIES, RATHER THAN CLAIMING INVENTED MONTHLY SEARCH VOLUMES. PRIMARY KEYWORDS • AMS 5401 • AMS 5401 MATERIAL • AMS 5401 SPECIFICATION • AMS 5401 ALLOY • AMS 5401 EQUIVALENT • AMS 5401 CASTING • AMS 5401 INVESTMENT CASTING • AMS 5401 NICKEL ALLOY • AMS 5401 MANUFACTURER • AMS 5401 SUPPLIER ROUND-BAR KEYWORDS • AMS 5401 ROUND BAR • AMS 5401 BAR • AMS 5401 EQUIVALENT ROUND BAR • ALLOY 625 ROUND BAR • INCONEL 625 ROUND BAR • UNS N06625 ROUND BAR • NICKEL ALLOY 625 ROUND BAR • NICKEL ALLOY ROUND BAR • INCONEL ROUND BAR • ALLOY 625 BAR • UNS N06625 BAR • 2.4856 ROUND BAR • 2.4856 BAR • NICR22MO9NB ROUND BAR • ASTM B446 ROUND BAR • AMS 5666 ROUND BAR MANUFACTURER/BUYER-INTENT KEYWORDS • ALLOY 625 ROUND BAR MANUFACTURER • INCONEL 625 ROUND BAR MANUFACTURER • UNS N06625 BAR MANUFACTURER • ALLOY 625 BAR SUPPLIER • INCONEL 625 BAR SUPPLIER • ASTM B446 BAR MANUFACTURER • AMS 5666 BAR MANUFACTURER • NICKEL ALLOY BAR MANUFACTURER • NICKEL ALLOY ROUND BAR SUPPLIER • INCONEL 625 STOCKIST • ALLOY 625 EXPORTER • INCONEL 625 ROUND BAR INDIA • ALLOY 625 SUPPLIER INDIA • UNS N06625 SUPPLIER INDIA TECHNICAL KEYWORDS • ALLOY 625 CHEMICAL COMPOSITION • UNS N06625 CHEMICAL COMPOSITION • INCONEL 625 PROPERTIES • ALLOY 625 MECHANICAL PROPERTIES • ALLOY 625 TENSILE STRENGTH • ALLOY 625 YIELD STRENGTH • ALLOY 625 CORROSION RESISTANCE • ALLOY 625 HEAT TREATMENT • ALLOY 625 MACHINING • ALLOY 625 WELDING • ASTM B446 SPECIFICATION • AMS 5666 SPECIFICATION • 2.4856 MATERIAL PROPERTIES • NICR22MO9NB MATERIAL • N06625 EQUIVALENT FAQ: AMS 5401 ROUND BAR IS AMS 5401 A ROUND BAR SPECIFICATION? NO. AMS 5401 COVERS VACUUM-MELTED, VACUUM-CAST INVESTMENT CASTINGS. IT SHOULD NOT BE REPRESENTED AS A CONVENTIONAL ROUND-BAR SPECIFICATION. WHAT IS THE MATERIAL ASSOCIATED WITH AMS 5401? IT IS ASSOCIATED WITH UNS N06625 / ALLOY 625, A NICKEL-CHROMIUM-MOLYBDENUM-NIOBIUM ALLOY. WHAT IS THE EQUIVALENT ROUND-BAR SPECIFICATION? FOR UNS N06625 ROUND BAR, ASTM B446 IS A KEY BAR SPECIFICATION, WHILE AMS 5666 IS COMMONLY SPECIFIED FOR AEROSPACE BAR/FORGING PRODUCTS. IS AMS 5401 THE SAME AS INCONEL 625? AMS 5401 SPECIFIES AN ALLOY ASSOCIATED WITH UNS N06625, WHILE INCONEL 625 IS A PROPRIETARY TRADE NAME FOR ALLOY 625) THE SPECIFICATION AND TRADE NAME SHOULD NOT BE TREATED AS IDENTICAL CONCEPTS. WHAT IS THE EN EQUIVALENT OF ALLOY 625? COMMON EUROPEAN DESIGNATIONS INCLUDE 2.4856 AND NICR22MO9NB. WHAT ASTM STANDARD COVERS ALLOY 625 ROUND BAR? ASTM B446 COVERS UNS N06625 ROD AND BAR. WHAT IS THE CHEMICAL COMPOSITION OF ALLOY 625? THE ALLOY CONTAINS AT LEAST APPROXIMATELY 58% NICKEL, 20–23% CHROMIUM, 8–10% MOLYBDENUM AND 3.15–4.15% NIOBIUM + TANTALUM, WITH ADDITIONAL CONTROLLED ELEMENTS. IS ALLOY 625 SUITABLE FOR OIL AND GAS? YES, ALLOY 625 IS WIDELY USED IN OIL-AND-GAS AND CORROSIVE-SERVICE EQUIPMENT, WITH APPLICABLE NACE/ISO REQUIREMENTS DEPENDING ON THE SERVICE ENVIRONMENT AND COMPONENT. ________________________________________ FINAL TECHNICAL SUMMARY AMS 5401 SHOULD BE MARKETED AND DESCRIBED ACCURATELY AS AN INVESTMENT-CASTING SPECIFICATION, NOT AS A GENERIC ROUND-BAR SPECIFICATION. SAE'S CURRENT LISTING IDENTIFIES AMS 5401C AS A NICKEL-ALLOY, CORROSION- AND HEAT-RESISTANT INVESTMENT-CASTING SPECIFICATION FOR VACUUM-MELTED AND VACUUM-CAST MATERIAL. FOR ROUND BAR, THE STRONGEST TECHNICALLY RELEVANT TERMINOLOGY IS: ALLOY 625 + UNS N06625 + INCONEL 625 + 2.4856 + NICR22MO9NB + ASTM B446 + AMS 5666 WHILE AMS 5401 SHOULD BE INCLUDED AS THE INVESTMENT-CASTING SPECIFICATION ASSOCIATED WITH THE ALLOY, NOT FALSELY PRESENTED AS THE BAR SPECIFICATION. ASTM B446 DIRECTLY COVERS UNS N06625 ROD AND BAR. RECOMMENDED TITLE “AMS 5401 ROUND BAR & ALLOY 625 MANUFACTURING GUIDE: UNS N06625, INCONEL 625, 2.4856, ASTM B446, AMS 5666 & GLOBAL EQUIVALENTS” RECOMMENDED META DESCRIPTION “EXPLORE AMS 5401, ALLOY 625, UNS N06625 AND INCONEL 625 MANUFACTURING, ROUND BAR SPECIFICATIONS, ASTM B446, AMS 5666, 2.4856, INTERNATIONAL EQUIVALENTS, CHEMICAL COMPOSITION, PROPERTIES, APPLICATIONS AND GLOBAL STANDARDS.”