Precipitation hardening S143
2026-08-05 09:04:45 Origin： Remark：0 Click：
S143 is defined as a low carbon precipitation hardening martensitic stainless steel, displaying characteristics of both austenitic and martensitic steels, round bar, flat bar stock available
S143 is designated as a martensitic stainless steel and also known as FV520 (precipitation hardening) stainless steel. S143 displays an excellent material for last-stage turbine blades, where high mechanical strength, good fatigue resistance, and reliable performance at elevated temperatures are critical.
Its corrosion resistance also makes it suitable for the harsh, high-moisture environment typical of steam turbines.
TYPICAL APPLICATIONS
Moving blade pins
Chemical equipment & parts
Mechanical parts used in the condition of corrosion resistance
Bolts and nuts for industry purpose
Mechanical parts used in the condition of corrosion resistance
Bolts and nuts for industry purpose
Industrial fan blades and blowers
Steam and gas turbine components
Compressors, rotors, shafts, and gears
High-stress structural aerospace and marine parts.
Typical chemical compositions (mass fraction - %)
Carbon, C (％): ≤ 0.07
Silicon, Si (％): ≤ 0.60
Manganese, Mn (％): ≤ 1.00
Phosphorus, P (％): ≤ 0.035
Sulfur, S (％): ≤ 0.015
Chromium, Cr (％): 13.2 ~ 14.7
Nickel, Ni (％): 5.00 ~ 5.80
Molybdenum, Mo (％): 1.20 ~ 2.00
Copper, Cu (％): 1.20 ~ 2.10
Carbon, C (％): ≤ 0.07
Silicon, Si (％): ≤ 0.60
Manganese, Mn (％): ≤ 1.00
Phosphorus, P (％): ≤ 0.035
Sulfur, S (％): ≤ 0.015
Chromium, Cr (％): 13.2 ~ 14.7
Nickel, Ni (％): 5.00 ~ 5.80
Molybdenum, Mo (％): 1.20 ~ 2.00
Copper, Cu (％): 1.20 ~ 2.10
Niobium, Nb (%): 0.10 ~ 0.40
MECHANICAL PROPERTIES UNDER AMBIENT TEMP.
Condition: double overaged,1020 ℃ +2 hours 750 / 850 ºC,+2 hours 620 ºC
Proof stress (N/mm²): 800
Tensile strength, Rm / MPa: 900
Yield strength, Rp0.2 / MPa: 700 ~ 880
Elongation, A5 (％): 15.0 Min.
Yield strength, Rp0.2 / MPa: 700 ~ 880
Elongation, A5 (％): 15.0 Min.
Hardness | HB: 277 ~ 321
Impact strength, Akv / Min.: 90J
Steel density: 7.80 kg / dm
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