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Greek Ascoloy UNS S41800

Greek Ascoloy is a chromium-nickel-tunsten, hardenable martensitic alloy that is designed for service at temperatures up to 1200f (649c) in highly stressed parts. Greek Ascoloy is an extremely deep hardening grade. When general physical properties of 12 percent chromium stainless steel are used, this alloy with its superior creep strength and resistance to tempering and stress-corrosion cracking is widely preferred.

Applications: Greek Ascoloy has good resistance to oxidation and scaling at temperatures up to 1400f (760c) It has its best corrosion resistance in the hardened and tempered condition. It is resistant to atmospheric conditions, weak organic acids and oxidizing acids.

Chemistry Analysis
Carbon 0.15%-0.20% Manganese 2.00%
Phosphorus 0.030% Sulfur 0.030%
Silicon 0.50% Chromium 12.00 - 14.00%
Nickel 1.80-2.20% Molybdenum 0.50%
Iron Balance Tungsten 2.60-3.50%

Heat Treatment

Annealing: typical Heat to 1300f (704c) approx four hours air cool. Brinell hardness approximately 280.

Alternate 1450f (788c) for two - four hours, furnace cooled to 800f (427c) then air cool to at least 200f (93c). Re-heat 1250/1350 (677/704c) for twelve hours minimum then air cool. Brinell hardness 255

Hardening: an austenizing temperature of 1700/1800f (927/982c) is generally used followed by oil or air. Large sections should be pre-heated at 1200/1400f (649/760c) prior to hardening.

Typical Room Temperature Tensile properties

Hardened at 1550f (954c) and oil quenched, followed by tempering at indicated temperature for four hours and air cooled.
Tempering Temperature Ultimate Tensile Strength % Elongation in 2" {50.8mm} % Reduction of Area
0.2% offset 0.2% offset 0.2% offset 0.2% offset
F C ksi Mpa ksi Mpa
500 260 175 1207 209 1441 18 53
600 316 180 1241 212 1462 17 55
700 371 183 1262 217 1496 16 57
800 427 185 1276 217 1496 16 57
900 482 165 1136 197 1358 17 58
1000 538 137 954 165 1138 17.5 59
1100 593 120 827 124 1000 18 60
1200 649 108 745 135 931 20 61
1300 704 98 676 125 862 22 62
Machinability:
Greek Ascoloy is easily machinable with characteristics similar to 410 stainless steel.
Specifications:
AMS 5616, ASTM A565
Shapes Manufactured:
Flat Bars, Square Bars, Round Bars, Rings, Hollows, Discs, Blocks and special Shapes. Send us a drawing to see how we can save you material and Machining time!

The information in this data sheet is for information only and should not be used for engineering.


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