Description

Corrosion Resistance

Alloy 901 has good corrosion resistance to the atmospheres normally found in jet engine operations. It has slightly lower scaling resistance than such alloy as Types 309 and 310 stainless steel.

Heat Treatment

Solution Treatment
1975/2025°F (1080/1107°C), hold 2 hours at heat, and water quench.

Stabiliztion Treatment
1400/1475°F (760/802°C), hold 2 to 4 hrs, and air cool.

Precipitation Hardening Treatment
1300/1375°F (704/746°C), hold for 24 hours, and air cool.

Workability

Hot Working
Alloy 901 is forged between 2050°F (1121°C) and 1850°F (1010°C), metal temperature. Light hot work may be continued down to 1600°F (871°C) but not below. Metal temperature should not exceed 2050°F (1121°C) during rapid working. Billets should be charged into a hot furnace and heated rapidly through the precipitation hardening range.

Weldability
Alloy 901 can be welded by the inert-gas-arc method. It is difficult to weld. All welding should be done in the solution treated condition. Cold worked parts should be re-solution treated before welding. A re-solution treatment is recommended after welding before stabilizing and aging.

Typical Mechanical Properties

Tensile Properties
Solution Treated: 2000°F (1093°C), 2 hours, water quenched. Stabilized: 1425°F (774°C), 4 hours , air cooled. Aged: 1350°F (732°C), 24 hours, air cooled.

Stress Rupture Strength
Solution Treated: 2000°F (1093°C), 2 hours, water quenched. Stabilized: 1425°F (774°C), 4 hours , air cooled. Aged: 1350°F (732°C), 24 hours, air cooled.

Physical Properties

Density, lb/cu in……………………………………………………………….. 0.294 Mg/cu m……………………………………………………………….. 8.14 Melting Range, °F……………………………………………………… 2335-2455 °C……………………………………………………… 1280-1345 Specific heat, Btu/lb-°F………………………………………………………. 0.103 J/kg-°C…………………………………………………………… 431 Permeability at 200 oersted (15.9 kA/m)………………………………..1.013 Coeffiecent of Expansion, 68-212°F, 10(-6) in/in-°F………………. 7.50 20-100°C, æm/m-°C……………………. 13.50 Electrical Resistivity, ohm-cir mil/ft……………………………………….. 674 æê-m………………………………………………….. 1.12

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