0Cr 17Ni4Cu4Nb national standard precipitation hardening stainless steel, 17-4PH (China old brand 0Cr 17Ni4Cu4Nb, new brand 05cr17ni4cu4nb) s17400,/kloc-.
Fushun GJB 0Cr 17Ni4Cu4Nb round steel
Features and scope of use:
Precipitation hardening steel with copper added. Used for manufacturing shaft and steam turbine parts.
Chemical composition:
C: ≤ 0.07
Silicon Si: ≤ 1.00
Manganese Mn: ≤ 1.00
Sulfur content: ≤ 0.030
Phosphorus P: ≤ 0.035
Chromium Cr: 15.50 ~ 17.50
Nickel Ni: 3.00-5.00
Copper: 3.00-5.00
Note: 0. 15 ~ 0.45
Mechanical properties:
Tensile strength σ b (MPa): aged at 480℃, ≥1310; Aging at 550℃, ≥1060; Aging at 580℃, ≥1000; Aging at 620℃, ≥930
Conditional yield strength σ 0.2 (MPa): aged at 480℃, ≥1180; Aging at 550℃, ≥1000; Aging at 580℃, ≥ 865; Aging at 620℃, ≥725
Elongation δ 5 (%): aged at 480℃, ≥10; Aging at 550℃, ≥12; Aging at 580℃, ≥13; Aging at 620℃, ≥ 16
Area shrinkage ψ (%): aging at 480℃, ≥ 40; Aging at 550℃, ≥ 45; Aging at 580℃, ≥ 45; Aging at 620℃, ≥50
Hardness: solid solution, ≤363HB and ≤ 38 HRC; Aging at 480℃, ≥375HB and ≥ 40 hours RC; Aging at 550℃, ≥33 1HB and ≥ 35 HRC; Aging at 580℃, ≥302HB and ≥3 1HRC; Aging at 620℃, ≥277HB and ≥28HRC.
Heat treatment specification and metallographic structure;
Heat treatment specification: 1) solid solution 1020 ~ 1060℃ rapid cooling; 2) aging at 480 DEG C, and air cooling at 470-490 DEG C after solution treatment; 3) aging at 550 DEG C, and air cooling at 540-560 DEG C after solution treatment; 4) aging at 580 DEG C, and air cooling at 570-590 DEG C after solution treatment; 5) aging at 620℃, solid solution treatment and air cooling at 6 10 ~ 630℃.
Metallographic structure: This structure is characterized by precipitation hardening.