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	PRODUCT DATA of 4340

Material	4340
General Information	4340 steel is a low alloy, nickel-chromium-molybdenum steel

	PHYSICAL PROPERTIES

Specific Gravity

7.83

	THERMAL PROPERTIES

Thermal Conductivity	37.5 W/m.K
Thermal Expansion Coefficient	11.3 μstrain/°C
Specific Heat	0.448 J/g.K

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

General Corrosion Status

Requires specific corrosion protection

Stress Corrosion Status

High Resistance to SCC: Table 1: UTS below 125 kg/mm2 A small number of laboratory failures of specimens cut from plate more than 2 inches thick have been observed at 75% yield, even within this ultimate strength range. The use of thick plate should therefore be avoided in a corrosive environment when sustained tensile stress in the short transverse direction is expected. Moderate Resistance to SCC: Table 2: UTS 125 to 140 kg/mm2 UTS Remark: Requires Stress corrosion evaluation form Low Resistance to SCC: Table 3: UTS above 140 kg/mm2 UTS Remark: Not for primary structural items Remark: Requires Stress corrosion evaluation form Remark: acc. to ECSS-Q-ST-70-36C Data Quality: Design Data