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Views: 2 Author: Wang Publish Time: 2024-10-16 Origin: Site
Stainless steel 17-4PH is a chromium-copper precipitation hardening stainless steel that is used for applications requiring high strength and a moderate level of corrosion resistance. It is one of the most widely used precipitation hardening grades, as it has high strength hardness up to about 572°F while demonstrating good corrosion resistance in all heat treated conditions. Alloy 17-4PH has adequate resistance to atmospheric corrosion or in diluted acid salts where its corrosion resistance is equivalent to Alloy 304 or 430. Alloy 17-4PH can be heat treated to a variety of temperatures to develop a wide range of properties. Its mechanical properties can be optimized with heat treatment where very high yield strength up to 180 ksi can be achieved. Alloy 17-4PH should not be used at temperatures above 572°F or at very low temperatures.
17-4PH stainless is an age-hardening martensitic stainless combining high strength with the corrosion resistance of stainless steel. Hardening is achieved by a short-time, simple low-temperature treatment. Unlike conventional martensitic stainless steels, such as type 410, Stainless steel 17-4PH is quite weldable. The strength, corrosion resistance and simplified fabrication can make 17-4PH stainless a cost-effective replacement for high strength carbon steels as well as other stainless grades. At the solution treating temperature, 1900°F, the metal is austenitic but undergoes transformation to a low-carbon martensitic structure during cooling to room temperature. This transformation is not complete until the temperature drops to 90°F. Subsequent heating to temperatures of 900-1150°F for one to four hours precipitation strengthens the alloy. This hardening treatment also tempers the martensitic structure, increasing ductility and toughness.
17-4PH stainless steel is a popular alloy, and for good reason: it offers excellent corrosion resistance, strength, and versatility. Whatever the application you need it for, our team can help ensure you have the right material for the job.
Carbon | 0.07% (Max) |
Silicon | 1.00% (Max) |
Manganese | 1.00% (Max) |
Phosphorous | 0.040% (Max) |
Sulfur | 0.030% (Max) |
Chromium | 15%-17.5% |
Molybdenum | 0.50% (Max) |
Nickel | 3%-5% |
Copper | 3%-5% |
17-4PH has excellent corrosion resistance. It withstands corrosive attack better than any of the standard hardenable alloys and approaches the corrosion resistance of the standard austenitic stainless steel grade 304 in most media. In rural and mild industrial atmospheres 17-4PH has excellent corrosion resistance. When exposed to sea coast atmospheres 17-4PH will slowly develop an overall light rusting and pitting. It is used successfully in salt water as boat shafting, with cathodic protection.
17-4PH can be cold formed to a limited extent in the annealed condition. Severe cold working should be done in the H1150 condition to reduce the possibility of cracking. The steel should be re-aged after cold forming to restore the best combination of properties. 17-4PH is readily hot forged. During heat treatment or forging, protective atmospheres containing carbon or nitrogen should be avoided. These elements can be absorbed into the steel surface and give soft austenitic skin. If a protective atmosphere is required argon or helium is recommended.
17-4PH can be machined in both the solution annealed condition and the precipitation hardened condition. Because the final heat treatment temperature is low, 17-4PH can be machined to final dimension in the annealed condition and then aged without significant dimensional change or scaling unless the component is large, when allowance should be made for contraction on aging. In the annealed condition machining is only marginally different from 300 series austenitic stainless steels. In the H900 condition the machining rate is 60% of that for annealed material.
17-4PH has excellent weldability under production conditions, with procedures similar to 300 series stainless steels. All welding methods can be applied. 17-4PH does not require pre-heat up to 100mm section. AWS A5.4 E630 Covered Electrodes and AWS A5.9 ER630 filler metals are used for welds of matching strength. For matching corrosion resistance, grade 308 or 309 consumables may be used. Weld metal properties approach those of the parent metal. Post weld heat treatment is required to achieve full strength. Single pass welds are precipitation hardened, multipass welds must be solution annealed first.
17-4PH stainless steel is known for its high strength, corrosion resistance, and toughness. Because of these traits, it is often used in the aerospace, medical, and food processing industries, as well as in construction, oil and gas, and transportation. Additionally, 17-4PH stainless steel is often used in the manufacturing of gears, valves, pumps, and fasteners, as well as in the production of molds and dies. The alloy’s high strength and corrosion resistance properties make it an ideal material for use in harsh and demanding environments.
17-4PH stainless steel is a good choice for the oil and gas industry because of its ability to withstand harsh conditions and corrosive environments. The alloy is highly resistant to corrosion caused by saltwater and chemicals, making it well suited for use in offshore and coastal environments. Additionally, 17-4PH stainless steel has a high strength-to-weight ratio, which makes it ideal for use in the oil and gas industry where weight and size are often critical factors.
In the food processing industry, corrosion-resistant 17-4PH stainless steel is often used in the production of food processing equipment, such as storage tanks, conveyors, and processing machinery. The alloy is magnetic, making it ideal for use in food environments where magnets are used to ensure contaminants are removed. Additionally, the high strength and durability of 17-4PH stainless steel make it well suited for use in applications that require frequent sanitation and cleaning processes.
The 17-4PH stainless steel has superior resistance to corrosion and has high mechanical strength. This enables it to be used in marine applications. The fact that it is resistant to corrosion enables it to survive exposure to salty sea water. You should know that one of the elements that confer the alloy with high resistance is chromium. Type 17-4PH stainless steel contains between 15-17.5% of chromium in its composition. In this regard, a seagoing vessel’s pump and valve parts are made of type 17-4 PH stainless steel.
What usually happens during nuclear power generation is there is the use of fuel during the process. The used fuel should be given some time to cool and be stored. Used or spent fuel from nuclear power generation is stored in a dry cask. The dry cask is usually fabricated using type 17-4 PH stainless steel. The spent fuel in the cask has an inert gas surrounding layer. The steel cylinder cask is usually butted or welded closed. The great welding characteristics of the alloy allow this to be possible. This design of the dry cask using type 17-4 PH stainless steel ensures that the radioactive spent fuel is in a safe storage design that is 100% leak proof. To ensure that there is adequate radiation shielding for you, in case you work in such a plant, reinforcement is achieved using extra steel, concrete or other material.
