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	PRODUCT DATA of AM 355

Material

AM 355

Product Datasheet

Pyromet 355

General Information

AM-355 is a companion alloy to AM-350 differing from it by a slightly lower Cr content and a higher amount of carbon. AM-355 has high strength up to 425C and good oxidation resistance up to 535C. The AM-355 alloy is generally hardened by subzero cooling and tempering (Condition SCT). Due to the higher Carbon content then AM- 300, AM-355 usually has little or none delta ferrite. Data for SCT1000 condition

Precautions

All other conditions below SCT1000 have low resistance to SCC

Chemical Composition

Fe-15.5Cr-3Mo-4.5Ni-0.15C

	ELASTIC PROPERTIES

Tensile Modulus

197 GPa Remark: ASM handbook

Shear Modulus

79.3 GPa

	THERMAL PROPERTIES

Thermal Conductivity

14.7 W/m.K

Thermal Expansion Coefficient

11.7 μstrain/°C

Specific Heat

0.5 J/g.K

Melting Range

1370 to 1400 °C

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

Stress Corrosion Status

High Resistance to SCC: Table 1 High resistance to SCC in SCT1000 condition Remark: acc. to ECSS-Q-ST-70-36C Data Quality: Design Data

EMF vs SCE

-0.07 V Remark: Measured in 3.5% NaCl solution Data Quality: Design Data

Welding

This alloy can be successfully welded using all common methods with the notable exception of Oxyacetylene. While preheating the weld piece is not required, it is recommended that the material be annealed after welding to retain maximum properties. For best strength at elevated temperature a filler metal should be chosen that is of similar chemistry.