Stainless steel FV520
2026-08-01 09:52:34 Origin： Remark：0 Click：
FV520B & FV520 is designated as a low carbon precipitation hardening martensitic stainless steel, displaying characteristics of both austenitic and martensitic steels.
FV520 & FV520B is designates as a precipitation hardening martensitic stainless steel, and FV520B is capable of being hardened by the different low-temperature treatments.
Type FV520 provides superior corrosion resistance when compared to other martensitic steel grades.
FV520B offers improved corrosion resistance in specific environments and also improved intergranular and pitting corrosion characteristics when compared to Garde 17-4PH / AISI 630 / S17400.
The alloy has higher tensile strength which is achieved through heat treatment (solution + Intermediate treatment + over-aged), our company also supplies the hardened or double over-aged condition based on the customers' specific requirements.
Final heat treatment practice: 1000 / 1040℃ solution + 750 / 850℃ Intermediate treatment + 550 / 580 / 620℃ over-aged.
TECHNICAL SPECIFICATIONS:
DIN EN 10088-3, EN 10088-1, 10297,10272,10312,10088-5 (2005)
ASTM A564, A693, A705; Grade XM-25, UNS S45000
‘S’ grades; S143, S144, S145
Proprietary FV520B, FV520
Custom 450, GD450, S45000
TYPICAL APPLICATIONS
Pump shafts & impellers & fasteners, fans & valves
Mechanical parts & hydraulic systems
Turbine blades and aerospace components
Medical devices, fasteners
Impellers and turbine blades
TYPICAL CHEMICAL COMPOSITIONS (mass weight - %)
Carbon, C (％): ≤ 0.07
Silicon, Si (％): ≤ 0.70
Manganese, Mn (％): ≤ 1.00
Phosphorus, P (％): ≤ 0.040
Sulfur, S (％): ≤ 0.015
Chromium, Cr (％): 13.0 ~ 15.0
Molybdenum, Mo (％): 1.20 ~ 2.00
Nickel, Ni (％): 5.00 ~ 6.00
Silicon, Si (％): ≤ 0.70
Manganese, Mn (％): ≤ 1.00
Phosphorus, P (％): ≤ 0.040
Sulfur, S (％): ≤ 0.015
Chromium, Cr (％): 13.0 ~ 15.0
Molybdenum, Mo (％): 1.20 ~ 2.00
Nickel, Ni (％): 5.00 ~ 6.00
Copper, Cu (%): 1.20 ~ 2.00
Niobium, Nb (%): 0.15 ~ 0.50
TYPICAL MECHANICAL PROPERTIES UNDER AMBIENT TEMP.
Hardness HB under annealed: 360 max.
Yield strength, Rp0.2 ≥ MPa: 680 ~ 800
Tensile strength, Rm / MPa: 900 ~ 1050
Elongation, A5 (lengthways) ≥ (％): 20.0
Impact absorbing power, Akv ≥ J | lengthways : 45
Tensile strength, Rm / MPa: 900 ~ 1050
Elongation, A5 (lengthways) ≥ (％): 20.0
Impact absorbing power, Akv ≥ J | lengthways : 45
The heat treatment to achieve the above properties will comprise three stages: 1000 ~ 1050℃ air cool, 750℃ air cool, 620℃, time at each temperature to be decided by the supplier.
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