Stainless steel: 17-4PH (sus630)
● Features and Scope:
Add precipitation hardening steel kinds of copper. For the manufacture of shafts, turbine components.
● Chemical Composition:
Carbon C: ≤0.07
Si Si: ≤1.00
Manganese Mn: ≤1.00
Sulfur S: ≤0.030
Phosphorus P: ≤0.035
Chromium Cr: 15.50 ~ 17.50
Ni Ni: 3.00 ~ 5.00
Copper Cu: 3.00 ~ 5.00
Niobium Nb: 0.15 ~ 0.45
● Mechanical Properties:
Tensile strength σb (MPa): 480 ℃ aging, ≥1310; 550 ℃ aging, ≥1060; 580 ℃ aging, ≥1000; 620 ℃ aging, ≥930
Conditions yield strength σ0.2 (MPa): 480 ℃ aging, ≥1180; 550 ℃ aging, ≥1000; 580 ℃ aging, ≥865; 620 ℃ aging, ≥725
Elongation δ5 (%): 480 ℃ aging, ≥10; 550 ℃ aging, ≥12; 580 ℃ aging, ≥13; 620 ℃ aging, ≥16
Reduction of area ψ (%): 480 ℃ aging, ≥40; 550 ℃ aging, ≥45; 580 ℃ aging, ≥45; 620 ℃ aging, ≥50
Hardness: solution, ≤363HB and ≤38HRC; 480 ℃ aging, ≥375HB and ≥40HRC; 550 ℃ aging, ≥331HB and ≥35HRC; 580 ℃ aging, ≥302HB and ≥31HRC; 620 ℃ aging, ≥277HB and ≥28HRC
● Heat treatment and microstructure specifications:
Heat treatment specifications: 1) solid solution 1020 ~ 1060 ℃ rapid cooling; 2) 480 ℃ aging after solution treatment, 470 ~ 490 ℃ air-cooled; 3) 550 ℃ aging after solution treatment, 540 ~ 560 ℃ air-cooled; 4) 580 ℃ aging after solution treatment, 570 ~ 590 ℃ air-cooled; 5) 620 ℃ aging after solution treatment, 610 ~ 630 ℃ air cooling.
Microstructure: Organizing for precipitation hardening.
● Delivery status: to heat treatment delivery in general, the treatment types specified in the contract; not indicated, by not heat treatment delivery. |
