GB/T 699 20Mn-E Introduce

Steel is one of the most widely used materials in the world, used for a variety of applications from construction to transportation. GB/T 699 20Mn-E is a popular alloy steel used for a variety of purposes, from precision machining to general engineering use. GB/T 699 20Mn-E is an alloy which is made up of two different types of steel: high-carbon steel and low-carbon steel. The high-carbon steel is used for the formation of the "matrix" of the metal; this contains the majority of the chemical elements listed above. The low-carbon steel is added for strength and is found mainly in the "alloying" elements. This combination of high-carbon and low-carbon steel creates a metal that is stronger and more durable than either type of steel alone.

Smelting temperature:1416°C - 1274°C

Application:High quality carbon structural steel

GB/T 699 20Mn-E Material Chemical Composition

The chemical composition of the GB/T 699 20Mn-E steel are as follows:

ElementMinMax
Silicon (Si)0.17000.3700
Sulfur (S)-0.0200
PhOsphorus (P)-0.0250
Nickel (Ni)-0.3000
Manganese (Mn)0.70001.0000
Copper (Cu)-0.2500
Chromium (Cr)-0.2500
Carbon (C)0.17000.2300

GB/T 699 20Mn-E Material Mechanical Properties

The mechanical properties of the GB/T 699 20Mn-E steel are as follows:

YieldRp0.2 ≤ 143 (MPa)
TeileRm≤ 614 (MPa)
ImpactKV/Ku41(J)
ElongationA42%
Reduction in cross section on fractureZ13%
As-Heat-Treated ConditionSolution and Aging, Annealing, Ausaging, Q+T,etc
Brinell hardness (HBW)113

GB/T 699 20Mn-E Material Thermal Properties

The thermal performance parameters of the GB/T 699 20Mn-E steel are as follows:

Temperature (°C)13949488
Modulus of elasticity (GPa)-126-
Mean coefficient of thermal expaion ×10-6/(°C)--34
Thermal conductivity (W/m·°C)-32.343.2
Specific thermal capacity (J/kg·°C)-131-
Specific electrical resistivity (Ω mm²/m)0.43--
Deity (kg/dm³)--324
Poisson’s coefficient, ν--214

GB/T 699 20Mn-E Material Machining Technology

Machining of GB/T 699 20Mn-E steel typically requires a combination of diverse machining processes for quality production of more complex components. China being the biggest steel producers in the world, manufactures and supplies GB/T 699 20Mn-E steel, which is a high-quality carbon structural steel. This type of steel is machinable and is suitable for the manufacture of automotive parts, machine tools, and many other machines. Typically, GB/T 699 20Mn-E steel is used extensively in the manufacture of machinery and tools, as it is strong, durable and has excellent corrosion resistance.