what is 1.4545 material ?
1.4545, commonly known as 15-5 PH stainless steel (or X5CrNiCu15-5), is a martensitic precipitation-hardening stainless steel designed for high strength, excellent corrosion resistance, and superior toughness compared to 17-4 PH. It is widely used in aerospace, petrochemical, and nuclear industries for critical, high-stress components.
What is 1.4545 stainless steel equivalent to?
1.4545 stainless steel is commonly known as 15-5 PH (or 15-5PH) and is a martensitic precipitation-hardening alloy widely used for its high strength and corrosion resistance. Its primary equivalents include UNS S15500, XM-12 (ASTM), and X5CrNiCuNb15-5 (EN). It is often considered a cleaner, more homogeneous alternative to 17-4 PH.
What is the composition of 1.4545?
The material 1.4545 is a precipitation-hardening stainless steel composed of 14.0%–15.5% Chromium, 3.5%–5.5% Nickel, 2.5%–4.5% Copper, 0.15%–0.45% Niobium, and a maximum of 0.07% Carbon, with the balance being Iron.
| Element | Minimum (%) | Maximum (%) |
|---|---|---|
| Carbon (C) | – | 0.07 |
| Chromium (Cr) | 14.0 | 15.5 |
| Nickel (Ni) | 3.5 | 5.5 |
| Copper (Cu) | 2.5 | 4.5 |
| Niobium (Columbium) + Tantalum (Nb+Ta) | 0.15 | 0.45 |
| Manganese (Mn) | – | 1.0 |
| Silicon (Si) | – | 1.0 |
| Phosphorus (P) | – | 0.04 |
| Sulfur (S) | – | 0.03 |
| Molybdenum (Mo) | – | 0.50 |
| Iron (Fe) | Balance | – |
1.4545 stainless steel Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ (0.282 lb/in³) |
| Melting Range | 1404-1440°C (2560-2625°F) |
| Thermal Conductivity at 150°C | 17.8 W/m·K |
| Coefficient of Thermal Expansion (21-93°C) | 10.8 × 10⁻⁶ /K |
| Modulus of Elasticity | 196 GPa (28.5 × 10⁶ psi) |
1.4545 stainless steel Mechanical Properties
The mechanical properties of 15-5PH stainless steel vary significantly based on the heat treatment condition. Below are typical properties for various common heat treatment conditions:
| Condition | Ultimate Tensile Strength, MPa (ksi) | 0.2% Yield Strength, MPa (ksi) | Elongation, % | Hardness, HRC (HBW) |
|---|---|---|---|---|
| H900 (aged at 482°C/900°F) | 1310 min (190 min) | 1170 min (170 min) | 10 min | 40 min (388 min) |
| H925 (aged at 496°C/925°F) | 1170 min (170 min) | 1070 min (155 min) | 10 min | 38 min (375 min) |
| H1025 (aged at 552°C/1025°F) | 1070 min (155 min) | 1000 min (145 min) | 12 min | 35 min (331 min) |
| H1075 (aged at 580°C/1075°F) | 1000 min (145 min) | 860 min (125 min) | 13 min | 32 min (311 min) |
| H1100 (aged at 593°C/1100°F) | 965 min (140 min) | 795 min (115 min) | 14 min | 31 min (302 min) |
| H1150 (aged at 621°C/1150°F) | 930 min (135 min) | 725 min (105 min) | 16 min | 28 min (277 min) |
| H1150M (double aged) | 795 min (115 min) | 520 min (75 min) | 18 min | 24 min (255 min) |
1.4545 Stainless Steel Heat Treatment
1.4545 stainless steel is a precipitation-hardening (PH) martensitic stainless steel whose mechanical properties can be precisely controlled through heat treatment.
The standard process includes solution annealing at 1020–1050°C, followed by quenching in air or oil, and finally aging at 480–500°C for 4–6 hours. After proper aging treatment, 1.4545 stainless steel can achieve a tensile strength of 1200–1500 MPa and a hardness of 45–50 HRC.
1.4545 Stainless Steel Corrosion Resistance
Due to its 16–17% chromium content, 1.4545 stainless steel, as a precipitation-hardening martensitic stainless steel, exhibits excellent corrosion resistance. It has good resistance to pitting and crevice corrosion in freshwater and weakly acidic environments and performs well in industrial applications with low chloride content.
Compared to standard martensitic steels, 1.4545 stainless steel maintains its corrosion resistance even after aging heat treatment, making it suitable for chemical, marine, and hydraulic applications.
1.4545 Stainless Steel Strength
The main advantage of 1.4545 stainless steel is its high strength and moderate toughness. After precipitation hardening treatment, its yield strength typically reaches 1000–1200 MPa, tensile strength reaches 1200–1500 MPa, and elongation is approximately 8–12%.
1.4545 Stainless Steel Supplier
We can supply 1.4545 in custom diameters, lengths, and heat treatment conditions, along with testing and certification to ASTM A564 / AMS 5637 standards.
| Product Form | Diameter / Size Range | Length / Supply | Surface Finish | Heat Treatment / Condition | Notes / Applications |
|---|---|---|---|---|---|
| Round Bar | 3 mm – 120 mm | Cut-to-length or coils | Bright / Polished | Solution Treated / Precipitation Hardened | Machining, forging, springs, fasteners |
| Flat Bar | Custom width & thickness | Cut-to-length | Polished / Matte | Solution Treated | Plates, springs, industrial components |
| Wire / Rod | 0.5 mm – 10 mm | Coiled or straight | Bright / Polished | Precipitation Hardened | Precision fasteners, springs, pins |
| Forgings | Custom | Custom | Machined / Polished | Age Hardened | Valves, pump parts, aerospace components |
| Tubes | Custom OD & wall thickness | Cut-to-length | Polished / Matte | Solution Treated / Hardened | Hydraulic, mechanical, structural applications |
| Strip / Ribbon | Custom width & thickness | Coiled | Bright / Matte | Solution Treated / Hardened |
Springs, precision components, industrial tools |
