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PRODUCT DATA of 4130
Material4130
General InformationAISI 4130 is a low alloy steel containing molybdenum and chromium as strengthening agents
Processing and AssemblyThe alloy can be hardened by heat treatment.
Chemical Composition0.3C-1Cr-0.5Mn-0.2Mo, rem Fe
EXPERIENCE IN PRACTICE
Equivalent DesignationsDIN 1.7218, AFNOR 25 CD 4
PHYSICAL PROPERTIES
Specific Gravity7.85
ELASTIC PROPERTIES
Tensile Modulus205 GPa
Shear Modulus50 GPa
Bulk Modulus140 GPa
Poisson Ratio0.27 to 0.3
ELECTRICAL PROPERTIES
Electrical Volume Resistivity2.23e-7 ohm.m
THERMAL PROPERTIES
Thermal Conductivity42.7 W/m.K
Melting Range1430 °C
Specific Heat0.477 J/g.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
General Corrosion StatusRequires specific corrosion protection
Stress Corrosion StatusHigh 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
MachinabilityThis alloy is readily machined by conventional methods. Machinability is best with the alloy in the normalized and tempered condition.