All data is for information only------(Home)
	PRODUCT DATA of AISI 316

Material

AISI 316

Product Datasheet

316_316L_Data_Sheet

General Information

These molybdenum-bearing grades of austenitic stainless steel, which are normally used in the annealed condition, cannot be hardened by heat treatment; however, they can be hardened by cold work. Mo added to improve corrosion resistance in reducing environments; improved creep resistance over Type 302.

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

16-18Cr, 10-14Ni, <2Mn, <0.08C, 2-3Mo, rem Fe

Name of Manufacturer

many suppliers

	EXPERIENCE IN PRACTICE

Development Status

Commercial Product

Cost Range

Low

Lot Reproducibility

Good

Equivalent Designations

A4; A4-50; A4-70; A4-80; S30316, 1.4401, X5CrNiMo1810, 316S16

Space Experience

Good

	PHYSICAL PROPERTIES

Crystal Structure

Face centered cubic (fcc)

Phase changes

The compositions of these steels are balanced to provide a stable austenitic structure under most conditions. When they are slowly cooled through, or held, in the range 480 to 870C. carbides tend to precipitate near the grain boundaries. The tendency to and amount of carbide precipitation increases with carbon content. A small amount of ferrite tends to form in cold-worked material and in welds. Sigma phase, which reduces toughness and corrosion resistance similar to carbide precipitation, can form in the ferrite at temperatures between 540 to 870C. Sigma phase, like carbide precipitation, can be removed by annealing.

Magnetic Properties

Nonmagnetic

	ELASTIC PROPERTIES

Poisson Ratio

0.26

	THERMAL PROPERTIES

Thermal Conductivity

15.8 W/m.K

Thermal Expansion Coefficient

17.2 μstrain/°C

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

General Corrosion Status

No specific corrosion protection required

Corrosion/Thermal

They have good resistance to oxidation in air at temperatures up to at least 810C. The carbide precipitation and extreme susceptibility to intergranular corrosion induced in AISI 316 by exposures to temperatures between 480 and 870C. is minimized in the 316L modification; nevertheless, these low-carbon grades can also become susceptible after extremely long exposures in this temperature range.

Atmospheric Corrosion

These alloys have good resistance to oxidation in air at temperatures up to at least 815C

Stress Corrosion Status

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

EMF vs SCE

-0.07 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

Welding

The alloys are readily weldable by the conventional automatic and manual electric-arc teclmiaues. The filler material should be the same alloy as the parent material. AISI 316 is subject to carbide precipitation in the heat-affected zones; therefore. susceptibility to intergranular corrosion should be eliminated by a post-weld annealing treatment. 316L does not require remedial annealing after welding and are, therefore, widely used in welded structures.

	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