SS 15-5 PH

SS 15-5 PH | UNS S15500 | EN 1.4545 | BSS7055 Rev A | AMS 5862 | STD 2154 | BMS 7-240 | ASTM A 564

Introduction

The 15-5 PH alloy was designed to have greater toughness than 17-4 PH. The 15-5 PH alloy is martensitic in structure in the annealed condition and is further strengthened by a relatively low temperature heat treatment which precipitates a copper containing phase in the alloy. 15-5 PH is also referred to as XM-12 in some specifications.

Stainless steel 15 – 5 PH, also known as XM-12 or UNS S15500, is a modification of 17-4 PH developed in the 1960s. It has a more refined microstructure obtained through the remelting process. This refined structure improves toughness of the material. UNS S15500 also has low temperature hardening, good fabrication properties and excellent corrosion resistance, which makes it suitable for many industries. It can be machined in the solution-annealed state or in final heat treat condition. The strength and ductility of UNS S15500 can be enhanced through heating the material at different temperatures.

UNS S15500 is a martensitic precipitation hardening type stainless steel. Martensitic stainless steels were designed to be corrosion resistant and hardened through heat treatment.

Chemistry

  Ni Cr Mn Cu Si Cb+Ta C P S Fe
MIN 3.5 14.0 2.5 0.15
MAX 5.5 15.5 1.0 4.5 1.0 0.45 0.07 0.04 0.03 Balance

Chemical Composition

The chemical composition of Grade 15-5 PH stainless steel is outlined in the following table.

Element Content (%)
Iron, Fe 75
Chromium, Cr 14.48
Nickel, Ni 4.5
Copper, Cu 3.5
Manganese, Mn ≤1
Silicon, Si ≤1
Nb + Ta 0.3
Carbon, C ≤0.07
Phosphorous, P ≤0.04
Sulfur, S ≤0.03

Inventory

  • 15-5 PH Plate, 15-5 PH Rectangular Bar, 15-5 PH Round Bar

Common Trade Names

  • 15-5 Stainless, 15-5 PH

Features

  • Precipitation Hardening
  • High Strength
  • Moderate corrosion resistance to 600°F

Applications

  • Aerospace applications
  • Chemical and petrochemical applications
  • Pulp and paper
  • Food processing
  • Marine gas turbine compressor sections
  • Hallow shafts
  • Paper mill equipment
  • Engine parts
  • Aircraft components
  • Gears
  • Fittings and fasteners
  • Nuclear reactor components

Physical Properties

  • Density: 0.280 lb/inch3
  • Poisson’s Ratio: 0.272
  • Electrical Resistivity: 589 Ohm-circ mil/ft
Temperature, °F 70 200 800
Coefficient of Thermal Expansion, in/in°F x 10-6 6.3
Thermal Conductivity
Btu • ft/ft2 • hr • °F
10.6
Modulus of Elasticity,
psi X 106
28.5

* 70°F to indicated temperature.

Mechanical Properties

Minimum Specified Properties, ASTM A 564

Condition H 900 H 1075 H 1150 A
0.2 Offset Yield Strength, ksi 170 125 105
Ultimate Tensile Strength, ksi 190 145 135
Elongation % in 2″ minimum 10 13 16
Reduction of Area, % 35 45 50
Hardness, Brinell 388 331 277 363 (MAX)

Specifications

AMS 5659, AMS 5862, AMS 5862J Type 2
ASME SA 564, ASME SA 693, ASME SA 705
ASTM A 564, ASTM A 693, ASTM A 698, ASTM A 705
ASTM-A564 (XM-12), BAC 5439 Rev H Class A Type1, BMS 7-240 (Boeing)
BSS7055 Rev A
STD 2154
UNS S15500
W. Nr./EN 1.4545

 

© FountainHead Alloys 1996