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Deutsch17-4 stainless steel
SAE Type 630 stainless steel (more commonly known as 17-4 PH, or simply 17-4; also known as UNS S17400) is a grade of martensitic precipitation hardened stainless steel. It contains approximately 15–17.5% chromium and 3–5% nickel, as well as 3–5% copper.[1] The name comes from the chemical makeup which is approximately 17% chromium and 4% nickel. SUS630 is the same as 17-4PH, and they both refer to the same grade. [2]
Properties
[edit]17-4 stainless steel can be heat treated to approximately 44 Rc,[1] and an ultimate tensile strength of 1,300 MPa (190,000 psi).
Its density ranges from 7,800 to 7,900 kg/m3 (0.282 to 0.284 lb/cu in), and its modulus of elasticity ranges from 197 to 207 GPa (28.5×106 to 30.0×106 psi).[3]
The corrosion resistance[1] and machinability[4] of 17-4 are comparable to austenitic 304 stainless steel. 17-4 is magnetic due to its martensitic structure.
Overaging (aging beyond the peak strength condition) improves resistance to stress corrosion cracking.[5]
Applications
[edit]17-4PH is used in applications requiring high strength, hardness, and corrosion resistance up to 300 °C (600 °F).[4]
17-4PH stainless steel is also used in aerospace and petrochemical industries.[6]
It is also used in the petroleum, chemical, and firearm industries.[1]
Composition
[edit]| C | Mn | P | S | Si | Cr | Ni | Cu | Nb, Ta | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 0.07 max. | 1.0 max. | 0.04 max. | 0.03 max. | 1.0 max. | 15.0–17.5 | 3.0–5.0 | 3.0–5.0 | 0.15–0.45 | balance |
References
[edit]- ^ a b c d e "Type 630; 17 Cr-4 Ni; UNS 17400" (PDF). Outokumpu.com. Archived from the original (PDF) on December 23, 2015. Retrieved June 5, 2016.
- ^ "SUS 630(17-4PH)" (PDF). Atlas Steels. Retrieved April 23, 2021.
- ^ MIL-HDBK-5J. United States Department of Defense. 31 January 2003. p. 2-195.
- ^ a b c "North American Stainless – Long Products Stainless Steel Grade Sheet" (PDF). North American Stainless. Retrieved June 5, 2016.
- ^ "Stress Corrosion Properties of High-Strength Precipitation Hardening Stainless Steels in 3.5% Aqueous Sodium Chloride Solution" (PDF). Archived from the original (PDF) on September 6, 2015. Retrieved September 6, 2016.
- ^ "Applications of 17-4PH Stainless Steel". Duplex Steel India. Retrieved 2024-11-21.
External links
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