ASTM A1031/A1031M Grade 5140 Introduce

ASTM A1031/A1031M Grade 5140 is a specification for Structural Steel with Improved Toughness, commonly known as "Tough Steel". It is a high strength steel that has good ductility and toughness characteristics. Its chemical composition consists of a small amount of carbon, larger amounts of manganese and chromium, and other trace elements such as phosphorus and sulfur. The steel is primarily used in applications where high strength and good ductility are required, such as bridge girders, crane booms and truck frames.

Smelting temperature:1346°C - 1984°C

Application:Hot rolled heavy-duty tin coil drawing and structural alloy steel sheet and strip specifications

ASTM A1031/A1031M Grade 5140 Material Chemical Composition

The chemical composition of the ASTM A1031/A1031M Grade 5140 steel are as follows:

ElementMinMax
Silicon (Si)0.15000.3000
Sulfur (S)-0.0250
PhOsphorus (P)-0.0250
Manganese (Mn)0.70000.9000
Chromium (Cr)0.70000.9000
Carbon (C)0.48000.5300

ASTM A1031/A1031M Grade 5140 Material Mechanical Properties

The mechanical properties of the ASTM A1031/A1031M Grade 5140 steel are as follows:

YieldRp0.2 ≤ 628 (MPa)
TeileRm≤ 869 (MPa)
ImpactKV/Ku14(J)
ElongationA34%
Reduction in cross section on fractureZ34%
As-Heat-Treated ConditionSolution and Aging, Annealing, Ausaging, Q+T,etc
Brinell hardness (HBW)123

ASTM A1031/A1031M Grade 5140 Material Thermal Properties

The thermal performance parameters of the ASTM A1031/A1031M Grade 5140 steel are as follows:

Temperature (°C)42618594
Modulus of elasticity (GPa)-699-
Mean coefficient of thermal expaion ×10-6/(°C)--42
Thermal conductivity (W/m·°C)-24.343.2
Specific thermal capacity (J/kg·°C)-241-
Specific electrical resistivity (Ω mm²/m)0.43--
Deity (kg/dm³)--143
Poisson’s coefficient, ν--331