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ISO/TR 15608 ISO/TR 15608 Material Group 7.3

ISO/TR 15608 Material Group 7.3: Precipitation-hardened stainless steels with C ≤ 0,35 % and 10,5 % ≤ Cr ≤ 30 %;

Features of ISO/TR 15608 Material Group 7.3: Precipitation-hardened stainless steels

Precipitation hardening grades have higher alloying contents than martensitic steel grades. They contain nickel, and in order to achieve hardening by aging additions of copper, aluminium, titanium, niobium and molybdenum. Martensitic steel grades and precipitation hardening (PH) stainless steels are heat treatable and can therefore provide hardness and strength in a wide range of applications. Allowing to workability they are supplied in solution annealed condition. The downstream manufacturer performs final heat treatment to meet the mechanical properties required.

The precipitation-hardened stainless steels, martensitic, niobium-stabilized chromium-nickel steels are an excellent alternative for applications where the mechanical properties and corrosion resistance of martensitic steels are not sufficient:

  • are insensitive to intergranular corrosion
  • are highly resistant to vibration and stress corrosion cracking
  • are characterized by high mechanical strength and corrosion resistance is suitable for low temperatures
  • are suitable for an operating temperature of up to approx. 350 degrees C
  • can be welded in the solution-annealed condition

Typical technical properties of material 17-4-PH (+800 condition):

Yield strength: Rp0,2 = 600 MPa
Tensil strength: Rm = 900 – 1100 MPa
Hardness: HBWmax = 360

Applications of precipitation-hardened stainless steels

Typical applications for martensitic stainless steel grades: fasteners, springs, press plates, seals, oil field valve equipment, chemical process equipment, part of steam and gas turbines.

Typical materials in group 7.3

NameNumberStandardProductAISI/
Trade Marks
Remarks
X5CrNiCuNb16-4 1.4542EN 10088-3Bar
X5CrNiCu15-5
15-5-PH
1.4545
S15500

ASTM A-564

Bar

XM-13

ASME BPVC
X5CrNi CuNb17-4-4
17-4PH
1.4548
S17400
EN 10088-3 +AT
ASTM A-564

Bar

630

ASME BPVC
Table: Typical materials