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	PRODUCT DATA of AISI 304L

Material

AISI 304L

Product Datasheet

AK steel 304_304L_Data_Sheet Aubert Duval 304L_X18BC

General Information

Type 304 Stainless Steel is a variation of the basic 18-8 grade, Type 302, with a higher chromium and lower carbon content. Its lower carbon minimizes chromium carbide precipitation due to welding and its susceptibility to intergranular corrosion. This austenitic Cr-Ni stainless steel possesses high ductility, excellent drawing, forming, and spinning properties. It is essentially non-magnetic, becomes slightly magnetic when cold worked. Type 304L is an extra low-carbon variation of Type 304 with a 0.03% maximum carbon content that eliminates carbide precipitation due to welding. As a result, this alloy can be used in the “as welded” condition, even in severe corrosive conditions. In many cases it eliminates the necessity of annealing weldments except for applications specifying stress relief. Type 304L has slightly lower mechanical properties than Type 304.

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

8 to 12% Ni, 18 to 20% Cr, 2% Mn max, 1% Si max, 0.03% C max, Rem. Fe

Name of Manufacturer

Many European suppliers.

	EXPERIENCE IN PRACTICE

Development Status

Commercial Product

Cost Range

Low

Equivalent Designations

1.4306, 1.4307, X18BC,AISI304L

Space Experience

Good

	PHYSICAL PROPERTIES

Crystal Structure

Face centered cubic (fcc)

Specific Gravity

7.95

Magnetic Properties

Nonmagnetic

	ELASTIC PROPERTIES

Tensile Modulus

193 to 200 GPa

Shear Modulus

80 GPa @ Room temperature

Poisson Ratio

0.29

	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

-0.1 V Remark: Measured in 3.5% NaCl solution 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

	SPECIAL RECOMMENDATIONS

Special Recommendations

AISI 304L is the low carbon version of AISI 304 (0.08 %C) which may be susceptible to intergranular corrosion in certain corrosive media after it is welded or otherwise heated at temperatures between 430 and 860°C. · For welded applications avoid the unstabilised, higher carbon, versions.