17-4PH alloy is a precipitation, hardening, martensitic stainless steel composed of copper and niobium/columb. 17-4PH is a martensitic precipitation hardening stainless steel. The performance characteristic of 17-4PH is that it is easy to adjust the strength level, which can be adjusted by changing the heat treatment process. Martensitic transformation and aging treatment to form precipitation hardening phase are the main strengthening methods. The 17-4PH attenuation performance is good, and the corrosion fatigue resistance and water droplet resistance are strong.
Features: After heat treatment, the mechanical properties of the product are more perfect, and can reach a compressive strength of up to 1100-1300 Mpa (160-190 ksi). This grade cannot be used at temperatures higher than 300°C (572°F) or very low temperatures. It has good corrosion resistance to the atmosphere and diluted acids or salts. Its corrosion resistance is the same as 304 and 430.
Tensile strength Rm (MPa): aging at 480°C, ≥1310; aging at 550°C, ≥1060; aging at 580°C, ≥1000; aging at 620°C, ≥930
Conditional yield strength Rp0.2 (MPa): aging at 480°C, ≥1180; aging at 550°C, ≥1000; aging at 580°C, ≥865; aging at 620°C, ≥725
Elongation A (%): aging at 480℃, ≥10; aging at 550℃, ≥12; aging at 580℃, ≥13; aging at 620℃, ≥16 Reduction of area Z (%): aging at 480°C, ≥40; aging at 550°C, ≥45; aging at 580°C, ≥45; aging at 620°C, ≥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 Density: 7.80g/cm3.
Heat Treatment Specification
1) Solid solution 1020～1060℃ fast cooling
2) Aging at 480℃, after solution treatment, air cooling at 470～490℃
3) Aging at 550℃, after solution treatment, air cooling at 540～560℃
4) Aging at 580℃, after solution treatment, air cooling at 570～590℃
5) Aging at 620℃, after solution treatment, air cooling at 610～630℃.
Metallographic structure: The structure is characterized by precipitation hardening.
Contact Person: Ms. Juliet Zhu