Comparison of 17-4PH and 15-5PH Materials
17-4PH is a martensitic precipitation hardened stainless steel. Has high strength, high hardness, good welding performance and corrosion resistance. It has been widely promoted and applied in the valve, shaft and chemical fiber industries, as well as high-strength components with certain corrosion resistance requirements.
17-4PH precipitation hardened steel grade with added copper. Used for manufacturing shaft and steam turbine components.
17-4PH precipitation hardened martensitic stainless steel composed of copper, niobium/columbium has low carbon content, better corrosion resistance and weldability than general martensitic stainless steel. Similar to 18-8 stainless steel, it has a simple heat treatment process and good machinability, but it is difficult to meet the requirements of deep cold processing.
Metallographic structure: The structural feature is precipitation hardening type.
17-4PH Stainless Steel Applications
Used for manufacturing components with high corrosion resistance and strength, such as bearings and turbine parts.
17-4PH Stainless Steel Chemical Composition
Carbon C: ≤ 0.07
Silicon Si: ≤ 1.00
Manganese Mn: ≤ 1.00
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.035
Chromium Cr: 15.50-17.50
Nickel Ni: 3.00-5.00
Copper Cu: 3.00-5.00
Niobium Nb: 0.15~0.45
Delivery Status
Generally delivered in a heat treated state, with the type of heat treatment specified in the contract; Unspecified items shall be delivered in non heat treated condition.
17-4PH alloy is a stainless steel with precipitation, quenching, and martensitic properties, and this grade has high strength, hardness, and corrosion resistance. After heat treatment, the mechanical properties of the product are further improved, reaching a compressive strength of up to 1100-1300 MPa (160-190 ksi). This grade cannot be used at temperatures above 300 ℃ (570F) or very low. It has good corrosion resistance to the atmosphere and diluted acids or salts, and its corrosion resistance is the same as 304 and 430.
17-4PH Material Mechanical Properties
Tensile strength σ B (MPa): Aging at 480 ℃, ≥ 1310; Aging at 550 ℃, ≥ 1060; Aging at 580 ℃, ≥ 1000; Aging at 620 ℃, ≥ 930
Conditional yield strength σ 0.2 (MPa): aging at 480 ℃, ≥ 1180; Aging at 550 ℃, ≥ 1000; Aging at 580 ℃, ≥ 865; Aging at 620 ℃, ≥ 725
Elongation rate δ 5 (%): Aging at 480 ℃, ≥ 10; Aging at 550 ℃, ≥ 12; Aging at 580 ℃, ≥ 13; Aging at 620 ℃, ≥ 16
Reduction of area ψ (%): Aging at 480 ℃, ≥ 40; Aging at 550 ℃, ≥ 45; Aging at 580 ℃, ≥ 45; Aging at 620 ℃, ≥ 50
Hardness: solid solution, ≤ 363HB and ≤ 38HRC; Aging at 480 ℃, ≥ 375HB and ≥ 40HRC; Aging at 550 ℃, ≥ 331HB and ≥ 35HRC; Aging at 580 ℃, ≥ 302HB and ≥ 31HRC; Aging at 620 ℃, ≥ 277HB and ≥ 28HRC
Heat treatment process
Heat treatment specifications:
1) Solid solution fast cooling at 1020-1060 ℃;
2) Aging at 480 ℃, after solid solution treatment, air-cooled at 470-490 ℃;
3) Aging at 550 ℃, after solid solution treatment, air-cooled at 540-560 ℃;
4) Aging at 580 ℃, after solid solution treatment, air-cooled at 570-590 ℃;
5) Aging at 620 ℃, after solid solution treatment, air-cooled at 610-630 ℃. Metallographic structure: The structural feature is precipitation hardening type.
15-5PH is a martensitic, precipitation hardened, chromium nickel copper stainless steel with excellent surface smoothness and dimensional stability. Good processing technology, excellent mechanical properties, and resistance to general corrosive environments. As early as the mid-1990s, it began to promote this steel bell and was one of the earliest companies in Shanghai to produce and operate this type of steel. This steel has good strength, toughness and ductility, as well as lateral, hardness and corrosion resistance, which are comparable to 304 stainless steel. May be used to solve or heat treat conditions to obtain various therapeutic properties.
15-5PH Steel Chemical Composition
Carbon content (C) 0.07,
Silicon (Si) 1.00,
Manganese (Mn) 1.00,
Phosphorus (P) 0.040,
Sulfur (S) 0.030,
Nickel (Ni) 3.50-5.50,
Chromium (Cr) 14.00-15.50,
Copper (Cu) 2.50-4.50,
Niobium (Nb) 0.15-0.45,
Other -
Mechanical performance
tensile strength σ B (MN/m2)>= five hundred and fifty
yield strength σ S (MN/m2)>= two hundred
elongation δ 5 (%) ＞=40
Shrinkage rate ψ (%)=55
Hardness: ≤ 187HB; ≤ 90HRB; ≤ 200HV
If used for high temperatures of 700 ℃, 15-5PH should be competent, as it is both austenitic stainless steel and widely used austenitic heat strength steel. However, it is best not to exceed 750 ℃. Its heat treatment is solid solution treatment, which means heating to 1000 ℃ or above, holding for a certain period of time before water quenching, and then using aging treatment above the operating temperature of 60-100 ℃.
17-4PH alloy is a stainless steel with precipitation, quenching, and martensitic properties. This grade has high strength, hardness (up to 3000 C/5000 C), and corrosion resistance. After heat treatment, the mechanical properties of the product are further improved, reaching a compressive strength of up to 1100-1300 MPa (160-190 ksi). This level cannot be used at temperatures above 300 0C (572 0F) or very low. It has good corrosion resistance to the atmosphere and diluted acids or salts, and its corrosion resistance is the same as 304 and 430.
15-5PH, is martensitic precipitation hardened stainless steel. It has good workability, excellent mechanical properties, and resistance to general corrosive environments
Both materials belong to precipitation hardening stainless steel, which is more difficult to process at 17-4PH and is mainly used in the aviation and steam turbine industries
