15-5PH
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15-5PH is a martensitic precipitation hardening stainless steel that combines high strength, good corrosion resistance, and machinability. It is widely used in aerospace, petrochemical, and food industries.
Product name：
High-frequency resistance welded steel pipe
Material：
GR B、X42、X46、X56
Warehouse：
Tianjin
Surface treatment：
Hot rolling
Category：
Keyword：
15-5PH
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Details description
Chemical Composition
Main element content (mass fraction, %):
Carbon (C) ≤0.07
Chromium (Cr) 14.00 - 15.50
Nickel (Ni) 3.50 - 5.50
Copper (Cu) 2.50 - 4.50
Niobium (Nb) + Tantalum (Ta) 0.15 - 0.45 (Tantalum content ≤0.10)
Manganese (Mn) ≤1.00
Silicon (Si) ≤1.00
Phosphorus (P) ≤0.040
Sulfur (S) ≤0.030
Iron (Fe) balance
Physical Properties
Density: 7.80 g/cm³
Melting point: 1416 - 1457℃
Thermal conductivity: 15.1 W/(m・K) (room temperature)
Specific heat capacity: 460 J/(kg・K) (room temperature)
Coefficient of linear thermal expansion: 11.2 × 10⁻⁶ /℃ (20 - 100℃)
Elastic modulus: 200 GPa (room temperature)
Magnetic properties: Martensite phase is magnetic; solid solution may exhibit weak magnetism
Mechanical Properties
Properties can be adjusted through different heat treatment processes (such as solution treatment and aging). Typical room temperature mechanical properties:
Tensile strength: ≥1034 MPa (after aging treatment)
Yield strength: ≥862 MPa (after aging treatment)
Elongation: ≥10%
Hardness: ≥30 HRC (after aging treatment)
Maintains good toughness at low temperatures and good strength stability at high temperatures (≤315℃).
Corrosion Resistance
Corrosion resistance is superior to traditional martensitic stainless steels (such as 410, 431), approaching that of 304 austenitic stainless steel.
It has good corrosion resistance to atmosphere, fresh water, seawater, and mildly oxidizing acids (such as nitric acid).
It has strong resistance to pitting and crevice corrosion, but its corrosion resistance is limited in high-concentration chloride ions or reducing acids.
With proper treatment, the risk of stress corrosion cracking can be reduced.
Processing and Welding Properties
1. Machinability:
2. Cold working: Good cold working performance in the solution-treated (softened) state; operations such as stamping, bending, and cold rolling can be performed. Hardness increases after age hardening, increasing processing difficulty.
Hot working: Suitable temperature range is 927 - 1149℃; slow cooling is required after hot working to avoid cracking.
Cutting performance: Superior to austenitic stainless steel, approaching that of medium carbon steel; cutting efficiency is higher after age hardening.
3. Heat treatment process:
4. Solution treatment: Heating at 980 - 1010℃, holding, then water quenching to obtain a supersaturated solid solution (softened state). Age hardening: Commonly used temperatures are 482℃ (H900), 552℃ (H1025), etc.; holding, then air cooling; strength is increased by precipitation of copper-based strengthening phases.
5. Weldability:
6. Methods such as gas tungsten arc welding (TIG) and arc welding can be used. Solution treatment is required before welding to reduce the risk of cracking. Age hardening is recommended after welding to restore mechanical properties; avoid prolonged exposure in the 370 - 565℃ range to prevent embrittlement.
Application Areas
Aerospace: Aircraft structural components, landing gear parts, engine parts, etc.
Petrochemical industry: Valves, pump shafts, fasteners, pressure vessels, etc.
Food industry: Food processing equipment, medical devices (such as surgical instruments).
Others: Precision mechanical parts, marine engineering components, etc.
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