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14.5 - 15.3 %
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2.5 - 4.0 %
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UGI®15-5 PH AIR is suitable for
UGI®15-5 PH AIR offers good corrosion resistance, sometimes similar to that of type 18 Cr-8Ni austenitic steels in some cases.
Pitting corrosion : UGI®15-5 PH AIR is much more resistant to pitting corrosion than the classical 12% Cr martensitic stainless steel. The level of pitting potential is comparable to the supermartensitic 1.4418 and to the austenitic 1.4301 (AISI 304).
Intergranular corrosion: The low carbon content of this steel (part of it is tied up with Nb) make insensitive to intergranular corrosion when heat treated properly according to previous recommendations.
Other mechanisms of corrosion: UGI®15-5 PH AIR is resistant to fatigue-corrosion as well as to stress corrosion in some environments and de-fined conditions. Furthermore, good resistance to corrosion-erosion should be noted due to the association of high level mechanical properties and corrosion resistance.
Because of its low sulphur content and its very good micro-cleanliness, UGI®15-5 PH AIR has a poor chip breakability which can induce difficulties during machining, especially in drilling or finish turning operations. If possible, most of the machining operations to obtain the final parts have to be done in the A-condition (solution annealed) state in order to avoid too important tool wears during machining. Machining after a “precipitation hardening” heat treatment is not recommended because the higher the mechanical characteristics of the UGI®15-5 PH AIR bars to be machined, the higher the tool wears (and thus the lower the machining productivity). In A-condition, rough turning tests (ap = 1.5 mm; f = 0.25 mm/rev) performed on drawn bars have shown that the cutting speed to have a flank wear of 0.15 mm in 15 min of effective cutting with a STELLRAM SP4019 CCGT 09T308E-62 tool is ~ 145 m/min whereas that of a UGIMA®4542 (17-4 PH with improved machinability) is ~ 160 m/min. Depending on the machining operation, the machining productivity of UGI®15-5 PH AIR is found to be 10 to 30% lower than UGIMA® 4542.
Heat treatments carried out on UGI®15-5PH AIR are composed of two steps:
Austenitisation: Solution annealing is performed around 1030-1050°C, and is interrupted by oil quenching or alternatively by air cooling for small section parts. In this condition (called condition A) hardness is intermediate because Cu precipitation hardening is not effective. Hence, the A-condition is often chosen to carry out machining or cold forming operations. In that case, we recommend performing a stress relief treatment at 300°C for 1 hour after austenitisation, in order to stabilize the material and avoid quench-cracking issues.
Aging: Aging treatments are performed after solution treatment to make Cu rich phases precipitate and adjust me-chanical properties. After aging, the material is in the solution and aged condition, also called H-condition. Aging treatments can be performed between 480°C (condition H900) and 620°C (condition H1150). The condition H900 corresponds to the peak of hardening, for which the Cu precipitates induce a maximum of hardness. For higher temperature the hardness/strength decreases when increasing aging temperature, due to the growth of the precipitates. Beyond 580°C some reverted austenite is formed during the aging which results in an increase of the toughness but a drop of the strength. The condition H1025 is often chosen by customers because it leads to an optimal trade-off between strength and toughness.
Softening: The lowest strength or hardness is obtained after the thermal cycle H1150M, consisting into of a solution an-nealing followed by a tempering at 760°C for 2 hours and an aging at 620°C for 4 hours. After this heat treatment cycle the mechanical properties are UTS = 780 MPa, YS = 710 MPa, HRC < 32 HRC, which is sig-nificantly lower than the condition A.
UGI®15-5 PH AIR is suitable for forging. Reheating must be carried out at a temperature between 1150 and 1200°C, forging between 1200°C and 950°C. Cooling after forging must be performed in air or oil. The parts obtained in this way have to be heat treated (solution annealing and eventual aging, see previous section)
Magnetic particle inspection and macro-graph
UGI®15-5 PH AIR complies with AMS 2300: Frequency/Severity rating 0/0
Macrostructure of UGI®15-5PH AIR is conforming to AMS 5659: class 1 to 4 are generally quoted severity A according to ASTM A604.
Other products: contact the supplier
Pickling procedure: UGI®15-5 PH AIR is pickled in the same way as 630 grade steel.
If necessary, the following decontamination treatment process is recommended, to move iron particles for example:
N.B.: the corrosion resistance of a stainless steel depends on many factors related to the composition of the corrosive atmosphere (chloride concentration, presence or absence of oxidizing agents, temperature, pH, ag-itation or no agitation, and so on), as well as to the preparation of the material (surfaces free from metal par-ticles, surface finish, such as hardening, polishing, and so on). Precautionary measures should be taken for certain tests such as the sodium chloride fog test (standard ISO 9227): for example marking labels (that might cause corrosion run-outs and reduce the test resistance time) should not be used on the sample.
UGI®15-5 PH AIR can be welded without preheating, using most welding techniques: GMAW or GTAW (with or without filler wire), LASER, resistance or electron beam welding, etc. If the mechanical characteristics of the weld area have to be at the same level as that of the base metal, no filler metal or homogeneous filler metal (such as AWS E/ER 630) have to be used and a post weld heat treatment of precipitation hardening (see the different PH heat treatment on page 4) has to be performed on the weld. If the mechanical characteristics of the weld area does not have to be at the same level as that of the base metal, a filler metal such as ER308LSi (19 9 L Si) can be used.
If no precipitation hardening heat treatment is done after welding, a stress relief heat treatment at 250/300°C could be useful to increase the toughness of the HAZ and avoid any risk of cold cracking due to their as-welded martensitic microstructures. Furthermore, it should be restated that the welding design should make allowance for the care required with all high steels with high proof stress: avoiding cut outs and sudden changes in cross section. For GMAW, we recommend the use of a protective gas made up of Ar+1%CO₂ or 1-2%O₂; for GMAW as well as for GTAW, gasses containing H₂ and N₂ must be avoided.