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	PRODUCT DATA of AISI 321

Material

AISI 321

Product Datasheet

AK steel 321_Data_Sheet Aubert Duval 321_X18PA

General Information

Titanium stabilized for service in 425 to 870C range and to minimize carbide precipitation when welding for resistance to intergranular corrosion

Effects of Space environment

The natural oxide layer is not repaired in vacuum when damaged. Cold welding might occur in contact to similar materials

Chemical Composition

17-19Cr, 9-12Ni, <2Mn, <0.08C, (5xC) Ti min, rem Fe

Name of Manufacturer

Aubert and Duval 22, rue Henri-Vuillemin • 92230 Gennevilliers - France 33 (0)1 55 02 58 00 33 (0)1 55 03 58 01 dircom@aubertduval.com www.aubertduval.com

	EXPERIENCE IN PRACTICE

Development Status

Commercial Product

Cost Range

Low

Lot Reproducibility

Good

Equivalent Designations

UNS S30403, Z 2 CN 18-10, FE-PA11, FE-PA3901, X1CrNi18-10, X2CrNi19-11, X18BC

Space Experience

Good

	PHYSICAL PROPERTIES

Crystal Structure

Face centered cubic (fcc)

Specific Gravity

8

Magnetic Properties

Nonmagnetic

	ELASTIC PROPERTIES

Tensile Modulus

193 GPa

Shear Modulus

78 GPa

Poisson Ratio

0.27

	ELECTRICAL PROPERTIES

Electrical Volume Resistivity

2.83e-7 ohm.m

Electrical Conductivity

2.41 %IACS

	THERMAL PROPERTIES

Thermal Conductivity

15.6 W/m.K

Thermal Expansion Coefficient

16.6 μstrain/°C

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

General Corrosion Status

No specific corrosion protection required

Stress Corrosion Status

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

EMF vs SCE

-0.08 V Remark: Measured in 3.5% NaCl solution. Passive condition Data Quality: Design Data

Bimetallic Corrosion

Can be connected without any restriction to: Cr, Au, Pt, C, Rh, Ag, Gun-metal, P-bronzes, Sn-bronzes, Ti+alloys Can be connected in a non-controlled environment to the above and Cd, Cu, Brasses, Ni, monel, inconel, N-Mo alloys, 400 series stainless steel Can be connected in a clean room environment to above and Al-Cu alloys, Cu-Ni alloys, Al-bronzes, Si-bronzes Needs specific measures: All others Test:ECSS-Q-ST-70C Rev.1 Table 5.1 Data Quality: Design Data

	FLUID SYSTEMS COMPATIBILITY

Gaseous Oxygen (GOX)

Meets the mechanical impact requirements. No batch test required.

Liquid Oxygen (LOX)

Meets the mechanical impact requirements. No batch test required.

Nitrogen Tetroxide (N2O4)

SCC susceptibility is low and no fluid decomposition

Hydrazine (HDZE)

SCC susceptibility is low and no fluid decomposition