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Model No: 1.4545 (X5CrNiCu15-5 / 15-5PH)
1.4545 (X5CrNiCu15-5 / 15-5PH) Stainless Steel Datasheet
Complete guide for 1.4545 / 15-5PH precipitation hardening stainless steel, including chemical composition, mechanical properties, heat treatment and industrial uses. Source premium 15-5PH steel from China stainless steel supplier ZYTC Alloy.
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1.4545, also marked as X5CrNiCu15-5 and widely known as 15-5PH, is a premium martensitic precipitation hardening stainless steel famous for balanced ultra-high strength, transverse toughness and reliable corrosion resistance. It maintains stable performance under extreme temperature conditions, ranging from cryogenic -196°C up to continuous 300°C high-temperature service, far outperforming conventional 17-4PH in cross-direction impact toughness with ferrite content controlled below 2% per AMS 5659 standard. As a professional China stainless steel & nickel alloy supplier,ZYTC Alloy specializes in standardized production of 1.4545 (15-5PH) bars, plates, forgings and custom machined components. We adopt strict VAR/ESR double remelting metallurgy to boost material purity and microstructure uniformity, supplying fully certified 15-5PH stainless steel for global aerospace, medical, offshore and chemical manufacturing clients. This alloy covers multi-industry scenarios: plant mechanical engineering, chemical & paper processing, medical equipment, petroleum & offshore marine structures, aerospace & spaceflight, plus sports leisure precision parts.  1. Metallurgical Production TechnologyThe premium grade 1.4545 (15-5PH) from ZYTC Alloy implements two remelting routes for different application demands:
Both processes eliminate internal impurities and segregation, delivering consistent macro & microstructures after hot forming. After solution annealing and aging treatment, the material forms martensite matrix dispersed with nano Ni3Cu intermetallic precipitates, which create its outstanding strength and toughness balance. Unlike common PH stainless steel, ZYTC Alloy strictly controls ferrite proportion under 2% to avoid toughness attenuation in heavy-load parts. 2. Chemical Composition Table (1.4545 / X5CrNiCu15-5, wt%)
ZYTC Alloy conducts full-spectrum chemical inspection for every batch of 15-5PH raw material to guarantee composition complies with EN 10088 and ASTM A747 standards, eliminating performance fluctuations caused by element deviation.  3. Heat Treatment Specification3.1 Solution AnnealingStandard heating range: 1025°C ~ 1050°C, followed by rapid cooling via water, oil or air based on workpiece cross-section thickness. Complete austenite-to-martensite phase transformation can be achieved only if the material fully cools to ambient temperature, laying the foundation for subsequent aging hardening. 3.2 Aging Hardening (Delivery Conditions)After solution treatment, aging at different temperatures generates diverse mechanical properties. ZYTC Alloy provides 1.4545 products in all standard aging temp grades per ASTM A747, full mechanical data shown in the table below: Mechanical Properties of 1.4545 (15-5PH) Under Different Aging States
 4. Fabrication & Processing Performance4.1 ForgeabilityOptimal hot forging temperature window: 1010°C ~ 1180°C. After hot forming, solution annealing treatment is mandatory to restore maximum hardness and toughness. ZYTC Alloy equips precision temperature-controlled forging furnaces to avoid overheating damage; prolonged high-temperature soaking is forbidden during production. 4.2 Machinability1.4545 can be machined with standard CNC cutting, drilling, tapping and threading. ZYTC Alloy offers pre-solution annealed 15-5PH semi-finished blanks to lower machining difficulty and reduce tool wear for customers. 4.3 WeldabilityCompatible with mainstream welding processes. Industrial best practice is to complete all welding operations before aging heat treatment, which effectively prevents heat-affected zone embrittlement and preserves the alloy’s overall mechanical performance. 5. Outstanding Corrosion Resistance1.4545 (15-5PH) ranks among the top tier of martensitic stainless steel in anti-corrosion capacity. Its microstructure contains nearly zero chromium carbide precipitates, delivering excellent resistance to intergranular corrosion. It performs reliably in humid air, mild acid, alkaline media and seawater environments, making it ideal for long-service-life marine and chemical processing equipment parts. 6. Standard Supply Sizes & ZYTC Alloy Custom ServiceZYTC Alloy stocks complete-size 1.4545 / 15-5PH semi-finished products, including bars, rods, plates, sheets and forgings. Flexible supply modes:
7. ApplicationsGlobal manufacturers widely adopt ZYTC Alloy’s 15-5PH stainless steel for critical high-strength corrosion-resistant components:
8. Why Choose ZYTC Alloy as Your 1.4545 Stainless Steel Supplier
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