One: Grade 17-4PH martensitic precipitation hardening stainless steel
Two: chemical composition
Carbon C: ≤ 0.07 Silicon Si: ≤ 1.00 Manganese Mn: ≤ 1.00 Sulphur S: ≤ 0.030 Phosphorus P: ≤ 0.035
Chromium Cr: 15.50 ~ 17.50 Nickel Ni: 3.00 ~ 5.00 Copper Cu: 3.00～5.00 Niobium Nb: 0.15～0.45
Three: Scope of application Application:
Suitable for the manufacture of good corrosion resistance and require high strength equipment parts. Such as engine parts, pump shafts, gears, piston rods and fasteners with characteristic requirements.
Mechanical properties
Tensile strength σb (MPa): 480 ℃ aging, ≥1310; 550 ℃ aging, ≥1060; 580 ℃ aging, ≥1000; 620 ℃ aging, ≥930, the condition of yield strength σ0.2 (MPa): 480 ℃ aging, ≥1180; 550 ℃ aging, ≥1000; 580 ℃ aging, ≥865; 680 ℃ aging. ≥865;620℃ aging, ≥725, elongation δ5 (%): 480℃ aging, ≥10;550℃ aging, ≥12;580℃ aging, ≥13;620℃ aging, ≥16, section shrinkage 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
Four: General
It is a kind of martensitic precipitation Hardening stainless steel material. In addition to the martensitic transformation is easy to strengthen, but also can be further strengthened by aging, and its corrosion resistance and weldability are better than the general martensitic steel, similar to the 18-8 austenitic steel.