AMS 5388 ROUND BAR & CW-12MW NICKEL ALLOY: MANUFACTURING, EQUIVALENT GRADES, SPECIFICATIONS, APPLICATIONS AND GLOBAL SUPPLY GUIDE TITLE: AMS 5388 ROUND BAR, CW-12MW, HASTELLOY C-276 EQUIVALENT & NICKEL ALLOY INVESTMENT CASTING MANUFACTURING GUIDE META DESCRIPTION: DISCOVER AMS 5388, CW-12MW AND HASTELLOY C-276 EQUIVALENTS, CHEMICAL COMPOSITION, ASTM, ASME, EN/DIN STANDARDS, INVESTMENT CASTING MANUFACTURING, APPLICATIONS AND GLOBAL SPECIFICATIONS. PRIMARY KEYWORDS: AMS 5388, AMS5388, AMS 5388 ROUND BAR, AMS 5388 BAR, CW-12MW, CW-12MW ALLOY, HASTELLOY C-276, HASTELLOY C276, NICKEL ALLOY ROUND BAR, NICKEL ALLOY BAR, NICKEL ALLOY CASTING, INVESTMENT CASTING, CORROSION RESISTANT NICKEL ALLOY, HEAT RESISTANT NICKEL ALLOY, ASTM A494, UNS N30002, EN 2.4886, NICKEL ALLOY MANUFACTURER, NICKEL ALLOY SUPPLIER SECONDARY KEYWORDS: AMS5388L, AMS 5388L, AMS 5388 EQUIVALENT, CW12MW, N30002, HASTELLOY C-276 EQUIVALENT, NICKEL CHROMIUM MOLYBDENUM ALLOY, NICKEL MOLYBDENUM TUNGSTEN ALLOY, CORROSION RESISTANT ALLOY, HIGH TEMPERATURE NICKEL ALLOY, PRECISION INVESTMENT CASTING, AEROSPACE NICKEL ALLOY, CHEMICAL PROCESSING ALLOY, VALVE CASTING, PUMP CASTING. AMS 5388: WHAT IS IT? AMS 5388 IS A HISTORICAL SAE AEROSPACE MATERIAL SPECIFICATION FOR A CORROSION- AND HEAT-RESISTANT NICKEL-BASE ALLOY. THE CURRENT REVISION IS AMS 5388L, REVISED SEPTEMBER 12, 2025. THE CURRENT SPECIFICATION TITLE IS: NICKEL ALLOY, CORROSION- AND HEAT-RESISTANT, INVESTMENT CASTINGS, 53.3NI - 16.5CR - 17MO - 4.5W - 5.8FE - 0.40V (CW-12MW), AS-CAST SAE EXPLICITLY STATES THAT AMS5388L COVERS THIS ALLOY IN THE FORM OF INVESTMENT CASTINGS. CRITICAL DISTINCTION FOR BUYERS ALTHOUGH SEARCHES FOR “AMS 5388 ROUND BAR” AND “AMS 5388 BAR” OCCUR IN THE INTERNATIONAL METALS MARKET, AMS5388 ITSELF IS NOT A WROUGHT ROUND-BAR SPECIFICATION. A SUPPLIER SHOULD THEREFORE DISTINGUISH BETWEEN: • AMS5388L INVESTMENT CASTING • CW-12MW CAST ALLOY • UNS N30002 CAST ALLOY • HASTELLOY C-276 WROUGHT PRODUCT • HASTELLOY C-276 ROUND BAR • OTHER NICKEL-ALLOY ROUND-BAR SPECIFICATIONS THIS DISTINCTION IS IMPORTANT WHEN PREPARING MILL CERTIFICATES, MATERIAL TEST CERTIFICATES, PURCHASE ORDERS AND AEROSPACE DOCUMENTATION. AMS 5388L MATERIAL IDENTIFICATION ITEM - IDENTIFICATION SAE SPECIFICATION: AMS 5388L MATERIAL FAMILY: NICKEL-BASE ALLOY PRODUCT FORM: INVESTMENT CASTING CONDITION: AS-CAST CAST DESIGNATION: CW-12MW CAST UNS N30002 RELATED WROUGHT ALLOY: HASTELLOY C-276 ASTM CAST SPECIFICATION: ASTM A494 EUROPEAN CAST DESIGNATION: 2.4886 / G-NIMO16CR16W MAJOR ALLOYING ELEMENTS: NI-CR-MO-W-FE-V MAIN CHARACTERISTICS: CORROSION AND HEAT RESISTANCE THE CW-12MW CAST ALLOY IS IDENTIFIED AS UNS N30002 AND IS ASSOCIATED WITH ASTM A494; EUROPEAN IDENTIFICATION INCLUDES 2.4886 / G-NIMO16CR16W, WHILE THE CORRESPONDING WROUGHT ALLOY IS IDENTIFIED AS UNS N10276 / HASTELLOY C-276) AMS 5388 CHEMICAL COMPOSITION THE CURRENT AMS5388L DESIGNATION IDENTIFIES THE ALLOY NOMINALLY THROUGH APPROXIMATELY: • NICKEL: 53.3% • CHROMIUM: 16.5% • MOLYBDENUM: 17% • TUNGSTEN: 4.5% • IRON: 5.8% • VANADIUM: 0.40% WITH NICKEL FORMING THE BALANCE TOGETHER WITH CONTROLLED MINOR ELEMENTS. THESE FIGURES ARE THE COMPOSITION DESIGNATION USED IN THE SAE MATERIAL SPECIFICATION TITLE AND SHOULD NOT BE TREATED AS A SUBSTITUTE FOR THE COMPLETE CHEMISTRY LIMITS IN THE PURCHASED AMS5388L DOCUMENT. FOR PRODUCTION, THE ACTUAL CHEMISTRY MUST BE CONTROLLED AGAINST THE APPLICABLE REVISION OF AMS5388L AND THE CUSTOMER'S PURCHASE SPECIFICATION. AMS 5388 INTERNATIONAL EQUIVALENTS ONE OF THE MOST COMMERCIALLY IMPORTANT ASPECTS OF AMS5388 IS UNDERSTANDING ITS CROSS-REFERENCE TERMINOLOGY. REGION / SYSTEM - EQUIVALENT / RELATED DESIGNATION USA SAE: AMS 5388L USA CAST UNSN30002 ASTM A494 CW-12MW CAST ALLOY DESIGNATION CW-12MW EUROPEAN MATERIAL DESIGNATION 2.4886 EUROPEAN CAST NAME G-NIMO16CR16W WROUGHT EQUIVALENT FAMILY UNS N10276 WROUGHT COMMERCIAL ALLOY HASTELLOY C-276 COMMON COMMERCIAL DESCRIPTION C-276 ALLOY FAMILY NICKEL-CHROMIUM-MOLYBDENUM-TUNGSTEN ALLOY A SPECIALIST CASTING REFERENCE IDENTIFIES CW-12MW / N30002 AGAINST ASTM A494 AND GIVES THE RELATED WROUGHT GRADE AS N10276 / HASTELLOY C276) IMPORTANT: “EQUIVALENT” DOES NOT AUTOMATICALLY MEAN “INTERCHANGEABLE.” CAST CW-12MW AND WROUGHT UNS N10276/HASTELLOY C-276 CAN HAVE DIFFERENT PRODUCT-FORM REQUIREMENTS, PROCESSING ROUTES, MECHANICAL PROPERTIES AND APPLICABLE STANDARDS. AMS 5388 AND HASTELLOY C-276 THE MOST IMPORTANT COMMERCIAL COMPARISON IS: CW-12MW CAST ALLOY ↔ HASTELLOY C-276 WROUGHT ALLOY CW-12MW IS WIDELY IDENTIFIED AS THE CAST COUNTERPART ASSOCIATED WITH HASTELLOY C-276) INDUSTRY CASTING REFERENCES IDENTIFY CW-12MW AS N30002 AND THE SIMILAR WROUGHT ALLOY AS HASTELLOY C276) THIS MEANS BUYERS SEARCHING FOR: • AMS 5388 • AMS5388L • CW-12MW • CW12MW • UNS N30002 • HASTELLOY C-276 • HASTELLOY C276 • C276 NICKEL ALLOY • NICKEL CHROMIUM MOLYBDENUM ALLOY • NICKEL ALLOY INVESTMENT CASTING MAY BE LOOKING FOR CLOSELY RELATED MATERIAL FAMILIES BUT NOT NECESSARILY THE EXACT SAME PRODUCT SPECIFICATION. COMMON NAMES AND TRADE NAMES INTERNATIONAL BUYERS MAY ENCOUNTER AMS5388/CW-12MW UNDER SEVERAL DESCRIPTIONS. COMMON NAMES • CW-12MW • CW12MW • N30002 • NICKEL ALLOY CW-12MW • NICKEL-CHROMIUM-MOLYBDENUM ALLOY • NICKEL-MOLYBDENUM-CHROMIUM-TUNGSTEN ALLOY • CORROSION-RESISTANT NICKEL ALLOY • HEAT-RESISTANT NICKEL ALLOY • NICKEL-BASE INVESTMENT CASTING ALLOY • C-276 CAST ALLOY COMMERCIAL / BRAND TERMINOLOGY HASTELLOY C-276 IS THE BEST-KNOWN COMMERCIAL DESIGNATION ASSOCIATED WITH THE WROUGHT N10276 ALLOY. “HASTELLOY” IS A REGISTERED TRADEMARK, SO MANUFACTURERS SHOULD DISTINGUISH A GENERIC MATERIAL DESCRIPTION FROM A BRANDED PRODUCT. PARMANU DHATU NIGAM, FOR EXAMPLE, IDENTIFIES ITS CW-12MW (N30002) AS SIMILAR TO HASTELLOY C-276 AND DESCRIBES APPLICATIONS INCLUDING PUMP AND VALVE INTERNALS. IS AMS 5388 AVAILABLE AS ROUND BAR? THIS IS WHERE MANY ONLINE MATERIAL DESCRIPTIONS BECOME MISLEADING. AMS 5388L ITSELF NO — AMS5388L IS AN INVESTMENT-CASTING SPECIFICATION, NOT A ROUND-BAR SPECIFICATION. IF A CUSTOMER NEEDS A ROUND BAR THE CORRECT APPROACH IS TO IDENTIFY THE REQUIRED WROUGHT C-276/N10276 SPECIFICATION, RATHER THAN SIMPLY MARKING THE MATERIAL “AMS5388 ROUND BAR.” A QUOTATION SHOULD CLEARLY STATE: CW-12MW / UNS N30002 CAST MATERIAL TO AMS5388L OR, WHERE A WROUGHT BAR IS ACTUALLY REQUIRED: UNS N10276 / HASTELLOY C-276 ROUND BAR TO THE APPLICABLE WROUGHT-BAR SPECIFICATION. THIS AVOIDS MATERIAL-CERTIFICATION AND TRACEABILITY PROBLEMS. AMS 5388 INVESTMENT CASTING MANUFACTURING PROCESS BECAUSE AMS5388L APPLIES TO INVESTMENT CASTINGS, THE MANUFACTURING PROCESS DIFFERS SUBSTANTIALLY FROM CONVENTIONAL ROUND-BAR PRODUCTION. 1) RAW MATERIAL SELECTION THE FOUNDRY BEGINS WITH CONTROLLED NICKEL-BASE ALLOY CHARGE MATERIAL. TYPICAL CHARGE-MANAGEMENT CONSIDERATIONS INCLUDE: • NICKEL BASE MATERIAL • CHROMIUM-BEARING ADDITIONS • MOLYBDENUM • TUNGSTEN • IRON • VANADIUM • LOW-CARBON CONTROL • TRACE-ELEMENT CONTROL • REVERT MANAGEMENT • HEAT/LOT TRACEABILITY CHARGE MATERIALS SHOULD BE SEGREGATED AND POSITIVELY IDENTIFIED TO PREVENT CROSS-CONTAMINATION. 2) VACUUM OR CONTROLLED MELTING NICKEL-BASE CORROSION-RESISTANT ALLOYS REQUIRE CAREFULLY CONTROLLED MELTING. DEPENDING ON THE FOUNDRY'S APPROVED PROCESS, MELTING MAY INVOLVE: • VACUUM INDUCTION MELTING • CONTROLLED-ATMOSPHERE MELTING • ELECTRIC MELTING • SECONDARY REFINING • CONTROLLED POURING THE OBJECTIVE IS TO ACHIEVE THE REQUIRED CHEMISTRY WHILE CONTROLLING: • GAS PICKUP • OXIDATION • NONMETALLIC INCLUSIONS • REVERT CHEMISTRY • SEGREGATION • POURING TEMPERATURE THE EXACT MELTING PRACTICE MUST BE QUALIFIED AGAINST THE APPLICABLE AMS AND CUSTOMER REQUIREMENTS RATHER THAN INFERRED SOLELY FROM THE ALLOY NAME. 3) WAX PATTERN PRODUCTION INVESTMENT CASTING BEGINS WITH A PRECISION PATTERN. TYPICAL STEPS INCLUDE: 1. DIE PREPARATION 2. WAX INJECTION 3. PATTERN INSPECTION 4. PATTERN ASSEMBLY 5. RUNNER AND GATING ATTACHMENT 6. TREE ASSEMBLY COMPLEX VALVE BODIES, PUMP COMPONENTS AND AEROSPACE COMPONENTS CAN BENEFIT FROM INVESTMENT CASTING BECAUSE THE PROCESS CAN PRODUCE INTRICATE GEOMETRIES WITH REDUCED MACHINING REQUIREMENTS. 4) CERAMIC SHELL BUILDING THE WAX ASSEMBLY IS REPEATEDLY COATED WITH CERAMIC SLURRY AND REFRACTORY MATERIAL. THE SHELL-BUILDING CYCLE GENERALLY INVOLVES: • PRIMARY COAT • STUCCO APPLICATION • DRYING • INTERMEDIATE COATS • REINFORCEMENT COATS • FINAL SHELL DRYING SHELL INTEGRITY IS CRITICAL BECAUSE PREMATURE CRACKING OR PERMEABILITY PROBLEMS CAN CAUSE CASTING DEFECTS. 5) DEWAXING THE COMPLETED CERAMIC SHELL IS HEATED SO THAT THE WAX PATTERN IS REMOVED. THIS CREATES THE NEGATIVE CAVITY CORRESPONDING TO THE FINISHED CASTING. 6) PREHEATING AND METAL POURING THE CERAMIC MOLD IS PREPARED FOR MOLTEN NICKEL ALLOY. CONTROLLED PARAMETERS CAN INCLUDE: • MOLD TEMPERATURE • ALLOY TEMPERATURE • POURING TEMPERATURE • POURING TIME • VACUUM/ATMOSPHERE • FILLING RATE • GATING DESIGN THE GOAL IS CONTROLLED FILLING AND SOLIDIFICATION WITH MINIMUM RISK OF: • MISRUNS • COLD SHUTS • SHRINKAGE • POROSITY • OXIDE INCLUSIONS • HOT TEARS 7) SOLIDIFICATION CONTROL CW-12MW CONTAINS SUBSTANTIAL MOLYBDENUM AND TUNGSTEN, MAKING SOLIDIFICATION BEHAVIOR IMPORTANT. FOUNDRY ENGINEERS MUST CONSIDER: • SECTION THICKNESS • THERMAL GRADIENTS • FEEDING • RISER DESIGN • GATING • SOLIDIFICATION SEQUENCE • LOCALIZED SHRINKAGE • INTERMETALLIC FORMATION COMPUTER-AIDED CASTING SIMULATION CAN BE USED TO PREDICT FILLING AND SOLIDIFICATION BEHAVIOR BEFORE PRODUCTION. 8) SHELL REMOVAL AND CUT-OFF AFTER SOLIDIFICATION: • CERAMIC SHELL IS REMOVED. • CASTINGS ARE SEPARATED FROM THE TREE. • GATES AND RUNNERS ARE REMOVED. • EXCESS MATERIAL IS GROUND. • SURFACE CLEANING IS PERFORMED. THE COMPONENTS THEN PROCEED THROUGH DIMENSIONAL AND METALLURGICAL INSPECTION. 9) HEAT TREATMENT HEAT TREATMENT REQUIREMENTS MUST FOLLOW THE CURRENT AMS5388L PURCHASE SPECIFICATION AND APPROVED PROCESSING ROUTE. DO NOT AUTOMATICALLY APPLY THE HEAT-TREATMENT CYCLE FOR WROUGHT HASTELLOY C-276 TO AN AMS5388L INVESTMENT CASTING. CAST AND WROUGHT PRODUCTS CAN HAVE DIFFERENT PROCESSING REQUIREMENTS. 10) MACHINING ALTHOUGH INVESTMENT CASTING CAN REDUCE MACHINING REQUIREMENTS, CRITICAL SURFACES MAY STILL REQUIRE: • CNC TURNING • CNC MILLING • DRILLING • BORING • THREADING • GRINDING • HONING • SURFACE FINISHING NICKEL-BASE ALLOYS ARE GENERALLY CHALLENGING TO MACHINE BECAUSE OF THEIR STRENGTH, WORK HARDENING AND HEAT GENERATION. AMS 5388 QUALITY CONTROL AND TESTING A PROFESSIONAL AMS5388L PRODUCTION PROGRAM SHOULD INCORPORATE APPROPRIATE INSPECTION CONTROLS. TYPICAL QUALITY-CONTROL ACTIVITIES CAN INCLUDE: CHEMICAL ANALYSIS • OPTICAL EMISSION SPECTROSCOPY • XRF WHERE APPROPRIATE • LABORATORY CHEMISTRY • HEAT VERIFICATION • PRODUCT ANALYSIS WHERE REQUIRED MECHANICAL TESTING DEPENDING ON THE SPECIFICATION AND PURCHASE ORDER: • TENSILE TESTING • YIELD-STRENGTH DETERMINATION • ELONGATION • HARDNESS • OTHER SPECIFIED MECHANICAL TESTS NONDESTRUCTIVE TESTING POTENTIAL INSPECTION METHODS INCLUDE: • LIQUID PENETRANT TESTING • RADIOGRAPHIC TESTING • ULTRASONIC TESTING WHERE APPLICABLE • VISUAL INSPECTION • DIMENSIONAL INSPECTION METALLURGICAL EXAMINATION WHERE REQUIRED: • MICROSTRUCTURE • POROSITY • INCLUSIONS • CARBIDE/INTERMETALLIC EVALUATION • CASTING INTEGRITY THE PRECISE ACCEPTANCE CRITERIA SHOULD ALWAYS COME FROM THE CURRENT AMS5388L REVISION AND CUSTOMER PURCHASE ORDER, RATHER THAN FROM A GENERIC CW-12MW DATASHEET. ASTM A494 CW-12MW FOR INTERNATIONAL CASTING PROCUREMENT, ASTM A494 IS PARTICULARLY IMPORTANT. CW-12MW IS LISTED UNDER ASTM A494 IN SPECIALIST CASTING REFERENCES, WITH UNS N30002 AS THE CAST ALLOY DESIGNATION. THEREFORE, AN INTERNATIONAL MATERIAL SEARCH MAY CONTAIN COMBINATIONS SUCH AS: ASTM A494 CW-12MW UNS N30002 CW-12MW NICKEL ALLOY CASTING HASTELLOY C-276 EQUIVALENT CASTING AMS5388L INVESTMENT CASTING THESE SHOULD BE TREATED AS RELATED SPECIFICATION/PRODUCT IDENTIFIERS, NOT BLINDLY SUBSTITUTED FOR ONE ANOTHER. AMS 5388 VS ASTM A494 AMS 5388L ORGANIZATION: SAE INTERNATIONAL MAIN PURPOSE: AEROSPACE MATERIAL SPECIFICATION PRODUCT FORM: INVESTMENT CASTINGS ALLOY: CW-12MW CAST UNS N30002 CONDITION: AS-CAST PER AMS DESIGNATION TYPICAL MARKET: AEROSPACE / HIGH-PERFORMANCE CERTIFICATION: AMS PURCHASE REQUIREMENT ASTM A494 ORGANIZATION: ASTM INTERNATIONAL MAIN PURPOSE: NICKEL/COBALT ALLOY CASTINGS PRODUCT FORM: VARIOUS CASTING GRADES/FORMS COVERED BY STANDARD ALLOY: INCLUDES CW-12MW CAST UNS N30002 CONDITION: DEPENDS ON APPLICABLE GRADE/REQUIREMENTS TYPICAL MARKET: INDUSTRIAL/GENERAL ENGINEERING CERTIFICATION: ASTM PURCHASE REQUIREMENT A COMPONENT ORDERED SPECIFICALLY TO AMS5388L SHOULD NOT BE REPRESENTED AS MERELY “ASTM A494” IF THE CUSTOMER REQUIRES AMS COMPLIANCE. RELATED INTERNATIONAL STANDARDS AND DESIGNATIONS THE MOST USEFUL STANDARDS TO INVESTIGATE ALONGSIDE AMS5388 INCLUDE: UNITED STATES • SAE AMS5388L • ASTM A494 • UNS N30002 • UNS N10276 FOR THE RELATED WROUGHT ALLOY • ASME MATERIAL REFERENCES WHERE THE SPECIFIC APPLICATION PERMITS EUROPE • EN MATERIAL DESIGNATION SYSTEMS • DIN MATERIAL DESIGNATION SYSTEMS • 2.4886 • G-NIMO16CR16W THE EUROPEAN IDENTIFICATION ABOVE IS ASSOCIATED WITH CAST CW-12MW. INTERNATIONAL COMMERCIAL TERMINOLOGY • CW-12MW • N30002 • C-276 CAST ALLOY • HASTELLOY C-276 • C276 • NICKEL ALLOY C276 AMS 5388 APPLICATIONS CW-12MW'S CORROSION RESISTANCE MAKES IT USEFUL IN SEVERE-SERVICE APPLICATIONS. TYPICAL APPLICATION AREAS INCLUDE: CHEMICAL PROCESSING • CHEMICAL PUMPS • VALVES • VALVE BODIES • PUMP HOUSINGS • IMPELLERS • CORROSIVE-FLUID COMPONENTS • CHEMICAL PROCESSING EQUIPMENT OIL & GAS POTENTIAL APPLICATIONS INCLUDE: • CORROSIVE-SERVICE VALVES • PUMP COMPONENTS • PROCESS EQUIPMENT • SEVERE CHEMICAL ENVIRONMENTS POLLUTION CONTROL • SCRUBBER COMPONENTS • FLUE-GAS PROCESSING EQUIPMENT • CORROSION-RESISTANT COMPONENTS POWER GENERATION POTENTIAL USES INCLUDE COMPONENTS EXPOSED TO AGGRESSIVE CHEMICAL ENVIRONMENTS AND HIGH-TEMPERATURE SERVICE. AEROSPACE THE AMS DESIGNATION ITSELF REFLECTS THE AEROSPACE-MATERIAL STANDARDS ENVIRONMENT, ALTHOUGH THE EXACT APPLICATION MUST SATISFY THE APPLICABLE DESIGN AUTHORITY AND PROCUREMENT REQUIREMENTS. WHY CW-12MW IS USED IN SEVERE CORROSION CW-12MW COMBINES: • HIGH NICKEL CONTENT • SIGNIFICANT CHROMIUM • HIGH MOLYBDENUM • TUNGSTEN • CONTROLLED IRON • VANADIUM THE CHROMIUM, MOLYBDENUM AND TUNGSTEN ADDITIONS CONTRIBUTE TO RESISTANCE IN DEMANDING CORROSIVE ENVIRONMENTS. INDUSTRY SOURCES SPECIFICALLY DESCRIBE CW-12MW AS A NICKEL-CHROMIUM-MOLYBDENUM ALLOY WITH RESISTANCE TO OXIDIZING AND REDUCING CORROSIVE ENVIRONMENTS AND RESISTANCE TO PITTING AND STRESS-CORROSION CRACKING. AMS 5388 VS HASTELLOY C-276 AMS5388L / CW-12MW PRODUCT FAMILY: CAST CAST UNS N30002 WROUGHT UNS — PRIMARY FORM: INVESTMENT CASTING ASTM RELATIONSHIP: A494 CW-12MW COMMERCIAL NAME: CW-12MW CHEMISTRY FAMILY: NI-CR-MO-W-FE-V DIRECT INTERCHANGEABILITY: NO HASTELLOY C-276 / UNS N10276 PRODUCT FAMILY: WROUGHT CAST UNS — WROUGHT UNS N10276 PRIMARY FORM: BAR, PLATE, SHEET, TUBE, ETC. DEPENDING ON SPECIFICATION ASTM RELATIONSHIP: DIFFERENT WROUGHT-PRODUCT STANDARDS COMMERCIAL NAME: HASTELLOY C-276 CHEMISTRY FAMILY: NI-CR-MO-W-FE DIRECT INTERCHANGEABILITY: NO THE RELATIONSHIP IS BEST DESCRIBED AS CAST CW-12MW / N30002 AND WROUGHT C-276 / N10276 BEING CLOSELY RELATED ALLOY GRADES, RATHER THAN TREATING THEM AS IDENTICAL SPECIFICATIONS. AMS 5388 ROUND BAR: HOW TO HANDLE AND TECHNICAL ACCURACY FOR PURPOSES, TERMS SUCH AS: • “AMS 5388 ROUND BAR” • “AMS 5388 BAR” • “AMS5388 NICKEL ALLOY BAR” • “AMS 5388 EQUIVALENT” • “AMS 5388 MATERIAL” • “AMS5388L” • “CW-12MW ROUND BAR” • “CW-12MW BAR” • “HASTELLOY C276 ROUND BAR” MAY ATTRACT USERS SEARCHING FOR THE MATERIAL. HOWEVER, THE PAGE SHOULD CLEARLY EXPLAIN THAT AMS5388L SPECIFIES INVESTMENT CASTINGS. THIS IS PREFERABLE TO FALSELY CLAIMING THAT AMS5388L IS ITSELF A ROUND-BAR STANDARD. HIGH-VOLUME GLOBAL KEYWORD CLUSTER FOR A GLOBAL METALS WEBSITE, THE FOLLOWING KEYWORD GROUPS ARE COMMERCIALLY USEFUL. EXACT-MATCH KEYWORDS • AMS 5388 • AMS5388 • AMS 5388L • AMS5388L • AMS 5388 MATERIAL • AMS 5388 SPECIFICATION • AMS 5388 EQUIVALENT • AMS 5388 ALLOY • AMS 5388 CASTING • AMS 5388 INVESTMENT CASTING PRODUCT KEYWORDS • NICKEL ALLOY CASTING • NICKEL ALLOY INVESTMENT CASTING • NICKEL ALLOY ROUND BAR • NICKEL ALLOY BAR • NICKEL ALLOY MANUFACTURER • NICKEL ALLOY SUPPLIER • CORROSION RESISTANT NICKEL ALLOY • HEAT RESISTANT NICKEL ALLOY • PRECISION INVESTMENT CASTING • NICKEL ALLOY CASTING MANUFACTURER CW-12MW KEYWORDS • CW-12MW • CW12MW • CW-12MW ALLOY • CW-12MW CASTING • CW-12MW INVESTMENT CASTING • CW-12MW EQUIVALENT • UNS N30002 • N30002 ALLOY • ASTM A494 CW-12MW C-276 KEYWORDS • HASTELLOY C276 • HASTELLOY C-276 • HASTELLOY C276 EQUIVALENT • C276 ALLOY • C276 ROUND BAR • C276 BAR • C276 CASTING • NICKEL ALLOY C276 • UNS N10276 • N10276 ROUND BAR BUYER-INTENT KEYWORDS • AMS 5388 SUPPLIER • AMS 5388 MANUFACTURER • AMS 5388 EXPORTER • AMS5388 STOCKIST • CW-12MW SUPPLIER • CW-12MW MANUFACTURER • UNS N30002 SUPPLIER • HASTELLOY C276 SUPPLIER • HASTELLOY C276 MANUFACTURER • NICKEL ALLOY INVESTMENT CASTING MANUFACTURER • NICKEL ALLOY CASTING SUPPLIER NOTE: I HAVE NOT REPRESENTED THESE AS MEASURED GLOBAL MONTHLY SEARCH VOLUMES. PUBLIC WEB SEARCH RESULTS DO NOT PROVIDE RELIABLE WORLDWIDE SEARCH-VOLUME FIGURES, AND FABRICATING NUMERICAL VOLUMES WOULD BE MISLEADING. THE KEYWORD ARCHITECTURE ABOVE IS INSTEAD BASED ON COMMERCIALLY RELEVANT TERMINOLOGY AND OBSERVED SEARCH NOMENCLATURE. COMMON BUYER SEARCH VARIATIONS INTERNATIONAL BUYERS MAY SEARCH FOR THE SAME MATERIAL USING DIFFERENT TERMINOLOGY: USA: AMS5388L, CW-12MW, UNS N30002, ASTM A494 EUROPE: 2.4886, G-NIMO16CR16W, NICKEL ALLOY CASTING INDIA: AMS 5388 MATERIAL, CW-12MW CASTING, HASTELLOY C276 CASTING, NICKEL ALLOY CASTING MANUFACTURER MIDDLE EAST: HASTELLOY C276 SUPPLIER, C276 VALVE CASTING, NICKEL ALLOY CASTING CHINA-ORIENTED SEARCHES: C276 ALLOY, CW-12MW, N30002 NICKEL ALLOY GENERAL ENGINEERING SEARCHES: CORROSION RESISTANT NICKEL ALLOY, HIGH TEMPERATURE NICKEL ALLOY, NICKEL ALLOY INVESTMENT CASTING. AMS 5388 MANUFACTURING DEFECTS TO CONTROL IMPORTANT CASTING DEFECTS CAN INCLUDE: • GAS POROSITY • SHRINKAGE POROSITY • HOT TEARING • INCLUSIONS • OXIDE CONTAMINATION • MISRUNS • COLD SHUTS • DIMENSIONAL DISTORTION • SURFACE DEFECTS • CORE DEFECTS • SEGREGATION • CRACKING A QUALIFIED FOUNDRY SHOULD ESTABLISH PROCESS CONTROLS FOR EACH DEFECT MECHANISM RATHER THAN RELYING SOLELY ON FINAL INSPECTION. AMS 5388 DOCUMENTATION FOR AEROSPACE AND HIGH-PERFORMANCE APPLICATIONS, DOCUMENTATION IS PARTICULARLY IMPORTANT. A TYPICAL MATERIAL PACKAGE MAY INCLUDE: • MATERIAL TEST CERTIFICATE • CERTIFICATE OF CONFORMANCE • HEAT NUMBER • CHEMICAL ANALYSIS • MECHANICAL TEST RESULTS • HEAT-TREATMENT RECORDS WHERE APPLICABLE • NDT REPORTS • DIMENSIONAL INSPECTION • TRACEABILITY DOCUMENTATION • FOUNDRY/PROCESS CERTIFICATION • CUSTOMER-SPECIFIC DOCUMENTATION THE CERTIFICATE SHOULD IDENTIFY THE ACTUAL SPECIFICATION AND REVISION PURCHASED, E.G. AMS5388L, RATHER THAN USING ONLY THE GENERIC PHRASE “HASTELLOY C276.” AMS 5388 REVISION HISTORY SAE'S PUBLISHED HISTORY SHOWS A LONG SEQUENCE OF REVISIONS: • AMS5388 — 1952 • AMS5388A — 1955 • AMS5388B — 1956 • AMS5388C — 1969 • AMS5388D — 1978 • AMS5388E — 1995 • AMS5388F — 1996 • AMS5388G — 2004 • AMS5388H — 2005 • AMS5388J — 2013 • AMS5388K — 2019 • AMS5388L — 2025 SAE CURRENTLY IDENTIFIES AMS5388L, REVISED SEPTEMBER 12, 2025) THE EVOLUTION IS SIGNIFICANT BECAUSE EARLIER VERSIONS USED DIFFERENT ALLOY DESCRIPTIONS. FOR EXAMPLE, THE 1952 VERSION WAS TITLED AS A NICKEL-BASE ALLOY WITH 17MO, 16CR, 6FE AND 5W, WHILE LATER REVISIONS ESTABLISHED THE MODERN CW-12MW DESIGNATION. AMS 5388 VS AMS 5389 THESE TWO SPECIFICATIONS ARE EASY TO CONFUSE BECAUSE THEY ARE ADJACENT IN THE AMS SEQUENCE. AMS5388: NICKEL ALLOY, CORROSION- AND HEAT-RESISTANT, INVESTMENT CASTINGS, CW-12MW, AS-CAST. AMS5389: A RELATED CORROSION- AND HEAT-RESISTANT ALLOY SPECIFIED FOR SAND CASTINGS, WITH A DIFFERENT CHEMISTRY AND SOLUTION-HEAT-TREATED CONDITION. THEREFORE, AMS5388 AND AMS5389 SHOULD NOT BE TREATED AS INTERCHANGEABLE SPECIFICATIONS. HOW TO SPECIFY AMS 5388 CORRECTLY ON A PURCHASE ORDER A TECHNICALLY STRONGER PURCHASE DESCRIPTION WOULD BE: “NICKEL-BASE CORROSION- AND HEAT-RESISTANT INVESTMENT CASTING, CW-12MW / UNS N30002, MANUFACTURED AND CERTIFIED TO SAE AMS5388L, AS-CAST CONDITION, WITH COMPLETE HEAT, CHEMICAL, MECHANICAL AND APPLICABLE NDT TRACEABILITY.” FOR A ROUND BAR, THE SPECIFICATION SHOULD INSTEAD IDENTIFY THE APPROPRIATE WROUGHT C-276/N10276 BAR STANDARD. FREQUENTLY ASKED QUESTIONS IS AMS 5388 A ROUND-BAR SPECIFICATION? NO. AMS5388L COVERS CW-12MW INVESTMENT CASTINGS, NOT WROUGHT ROUND BAR. WHAT IS THE CURRENT AMS 5388 REVISION? THE CURRENT REVISION IS AMS5388L, REVISED SEPTEMBER 12, 2025) WHAT IS CW-12MW? CW-12MW IS A NICKEL-BASE CORROSION- AND HEAT-RESISTANT CAST ALLOY ASSOCIATED WITH UNS N30002 AND ASTM A494) WHAT IS THE CLOSEST FAMOUS COMMERCIAL ALLOY? THE CORRESPONDING WROUGHT ALLOY IS COMMONLY IDENTIFIED WITH HASTELLOY C-276 / UNS N10276, ALTHOUGH CAST CW-12MW AND WROUGHT C-276 SHOULD NOT BE TREATED AS IDENTICAL PRODUCT SPECIFICATIONS. WHAT IS THE ASTM SPECIFICATION? CW-12MW IS ASSOCIATED WITH ASTM A494) WHAT IS THE UNS NUMBER? THE CAST CW-12MW DESIGNATION IS UNS N30002) CAN AMS5388L BE USED TO CERTIFY A C276 ROUND BAR? NOT BY ITSELF. AMS5388L IS AN INVESTMENT-CASTING SPECIFICATION. A WROUGHT ROUND BAR REQUIRES THE APPLICABLE WROUGHT-MATERIAL SPECIFICATION. IS 2.4886 AN EQUIVALENT? 2.4886 IS IDENTIFIED IN EUROPEAN MATERIAL REFERENCES FOR CW-12MW/G-NIMO16CR16W. THE EXACT EQUIVALENCE MUST BE VERIFIED AGAINST THE APPLICABLE PRODUCT STANDARD AND PURCHASE REQUIREMENTS. FINAL TECHNICAL SUMMARY AMS 5388L = CW-12MW = UNS N30002 CAST NICKEL ALLOY INVESTMENT CASTING SPECIFICATION, WITH A NOMINAL CHEMISTRY CENTERED AROUND 53.3NI-16.5CR-17MO-4.5W-5.8FE-0.40V. SAE'S CURRENT SPECIFICATION EXPLICITLY DEFINES THE PRODUCT AS INVESTMENT CASTINGS, AS-CAST. THE MOST IMPORTANT INTERNATIONAL CROSS-REFERENCE CHAIN IS: SAE AMS5388L → CW-12MW → UNS N30002 → ASTM A494 → EN/DIN 2.4886 / G-NIMO16CR16W → RELATED WROUGHT ALLOY UNS N10276 / HASTELLOY C-276 THE KEY OPPORTUNITY IS TO CAPTURE SEARCHES FOR “AMS 5388 ROUND BAR, ” “AMS5388 BAR, ” “CW-12MW, ” “UNS N30002, ” “HASTELLOY C276, ” “C276 ROUND BAR, ” “NICKEL ALLOY CASTING, ” AND “INVESTMENT CASTING”, WHILE CLEARLY EXPLAINING THE CRUCIAL DISTINCTION BETWEEN AMS5388L CAST PRODUCTS AND C-276 WROUGHT ROUND BAR.