Aceroinoxidable----Stainless Steel Grade 15-5 PH (UNS S15500)
Introduction
Stainless steel fifteen - five pH, conjointly called XM-12 or UNS S15500, could be a modification of 17-4 pH developed within the Sixties. it\'s a additional refined microstructure obtained through the remelting method. This refined structure improves toughness of the fabric. UNS S15500 conjointly has cold hardening, sensible fabrication properties and glorious corrosion resistance, that makes it appropriate for several industries. It may be machined within the solution-annealed state or in final heat treat condition. The strength and malleability of UNS S15500 may be increased through heating the fabric at completely different temperatures.
UNS S15500 could be a martensitic precipitation hardening sort stainless-steel. Martensitic unblemished steels were designed to be corrosion resistant and hardened through heat treatment.
Chemical Composition
The element composition of Grade 15-5 pH stainless-steel is made public within 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 |
Mechanical properties The mechanical property of Grade 15-5 pH stainless-steel are displayed within the following table
|
Properties |
Metric |
Imperial |
|
Tensile Strength |
1380 MPa |
200000 psi |
|
Yield Strength |
1275 MPa |
184900 psi |
|
Modulus of Elasticity |
200 GPa |
29000 ksi |
|
Elongation at Break |
10% |
10% |
|
Hardness, Brinell |
420 |
420 |
|
Hardness, Knoop |
451 |
451 |
|
Hardness, Rockwell B |
104 |
104 |
|
Hardness, Rockewell C |
44.2 |
44.2 |
|
Hardness, Vickers |
445 |
445 |
|
Charpy Impact |
10 J |
7.38 ft.lb |
Manufacturing method UNS S15500 may be machined beneath any of the getable conditions. Firstly, the alloy is gently fashioned within the old condition. it\'s then welded mistreatment fastening techniques like protected fusion or resistance ways. the fabric is heat treated at 1038°C (1900°F) for 1/2 h, so air cooled. This method is followed by hot-working the fabric and hardening at one038°C (1900°F) for 1 h. Finally, the alloy may be cold-worked to enhance its yield strength. Applications The following ar a number of the foremost applications of Grade 15-5 pH unblemished steel: Marine turbine mechanical device sections Hallow shafts Paper mill instrumentation Engine elements Aircraft elements Gears Fittings and fasteners Nuclear reactor elements
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