Jiangsu Zhonggongte Metallurgical Technology Co., Ltd.
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High strength 17-7PH stainless steel round steel, UNS S17700 hot-rolled rod, grinding rod, polished rod.
Introduction to 17-7PH Stainless Steel Material:
17-7PH is a stainless steel alloy with high strength, good elasticity, and corrosion resistance. It is composed of elements such as iron, chromium, nickel, aluminum, and molybdenum, while also containing small amounts of elements such as carbon, copper, and silicon. This alloy has good tensile properties and elastic recovery ability, and also has good stability in high temperature and highly corrosive environments.
The main purpose of 17-7PH is to manufacture high-strength, high toughness, and high conductivity parts, such as springs, conductors, fasteners, etc. in the fields of electronics, aerospace, military, etc.
It is also widely used in the manufacture of various springs and elastic components, such as mechanical seals, pneumatic components, engine parts, etc. Meanwhile, 17-7PH is also commonly used to manufacture various components at high temperatures, such as automotive emission systems, industrial heat exchangers, etc.
The chemical composition of 17-7PH stainless steel mainly includes carbon, chromium, nickel, manganese, silicon, phosphorus, sulfur, and aluminum.
| C | Cr | Ni | Mn | Si | P | S | Al |
| ≤0.09% | 16.00-18.00% | 6.50-7.75% | ≤1.00% | ≤1.00% | ≤0.040% | ≤0.030% | 0.75-1.50% |
Carbon (C): The content is usually below 0.09%, which helps to improve the hardness and strength of steel.
Chromium (Cr): with a content between 16.00% and 18.00%, its main function is to improve the corrosion resistance of steel.
Nickel (Ni): with a content between 6.50% and 7.75%, it improves the corrosion resistance of steel together with chromium.
Manganese (Mn): The content is usually below 1.00%, used to improve the strength and hardness of steel.
Silicon (Si): Content below 1.00% helps to improve the strength and hardness of steel.
Phosphorus (P): Content below 0.040% has little effect on the properties of steel.
Sulfur (S): Content below 0.030% has little effect on the properties of steel.
Aluminum (Al): with a content between 0.75% and 1.50%, it helps to improve the strength and hardness of steel.
In addition, 17-7PH stainless steel may also contain other elements such as niobium (Nb), with a content between 0.15% and 0.45%, to improve the strength and corrosion resistance of the steel. These chemical components collectively determine the mechanical properties and corrosion resistance of 17-7PH stainless steel, making it suitable for various industrial applications.
The density of 17-7PH stainless steel is approximately 7.8 g/cm ³.
| Density | 7.8 g/cm ³. |
In addition, other physical properties of 17-7PH stainless steel include:
Melting point: 1390-1430 ℃
Specific heat capacity: 0.5 kg/(kg · K)
Thermal conductivity: 16.3-20.9 W/(m · K)
Linear expansion coefficient: 15.3-17.1 × 10 ^ -6/K
Electrical resistivity: 0.8 Ω· mm ²/m
Longitudinal elastic modulus: 200 GPa
The advantages of 17-7PH stainless steel mainly include high strength, good corrosion resistance, processability, stress cracking resistance, weldability, and a wide range of application fields.
High strength: 17-7PH stainless steel can achieve excellent strength and hardness after heat treatment, and can maintain good mechanical properties even at high temperatures. Its tensile strength can reach 1700 MPa, elongation can reach 8%, and hardness can reach 30 HRC, enabling it to withstand significant external pressure and heavy loads
Good corrosion resistance: This stainless steel has excellent corrosion resistance in various environments, including acidic, alkaline, and chloride environments, and can effectively resist corrosion and stress corrosion cracking. It has excellent corrosion resistance in general chemical media, acid, alkali and other environments, and also exhibits good corrosion resistance in seawater.
Machinability: 17-7PH stainless steel has good plasticity and hardening ability, and its hardness can be controlled through heat treatment. It can also undergo various cold and hot working processes, such as forging, stamping, cutting, and welding.
Stress cracking resistance: Due to its aluminum content, 17-7PH stainless steel has good stress cracking resistance and is suitable for various high-temperature and high stress environments.
Weldability: 17-7PH stainless steel has good weldability in conventional welding, high-frequency induction welding, and arc welding.
Wide application fields: Due to the excellent performance mentioned above, 17-7PH stainless steel is widely used in aerospace, nuclear industry, chemical industry, precision instrument manufacturing and other fields, such as manufacturing high-temperature and high-pressure workpieces such as springs, sensors, valves, and parts.