A105Is from the U.S.ASTMStandard "Forgings of Carbon Steel for Pipeline Components"ARepresents ordinary carbon structural steel. This standard only specifies one type of carbon steel forging.A105It's essentially a forging carbon steel grade.A105It is a low-carbon steel forging.20#Steel is similar. There are two standards, one being the American standard "ASTMA105/A105MCarbon Steel Forgings for Pipeline Components, and the second is the Chinese Standard <GB/T12228-2006Carbon Steel Forging Technical Conditions for General Valves

A105Chemical Composition:

A105CarbonC:≤0.35

A105 SiliconSi:≤0.35

A105 ManganeseMn:0.6-1.05

A105 SulfurS:≤0.050

A105Phosphorus P:≤0.040，

A105 CopperCu≤0.4

A105 NickelNi≤0.4

A105MolybdenumMo≤0.12

A105VanadiumV≤0.08

A105 ChromeCr≤0.3

Mechanical properties: The mechanical properties are between20#Forged steel and16MnBetween forged steel.

A105Tensile strength:(σb)≥485Mpa

A105Yield Strength(σs)≥250Mpa

A105Post-elongation(δ)≥22%

A105Section reduction rate(ψ)≥30%

A105Hardness ≤HB187

Note: Generally in the pipeline system,A105Can substitute20#Steel, but20#Steel cannot fully replaceA105However, there is still a significant difference in strength.A105Stress corrosion cracking resistance(SCC)Sex Ratio20#Steel is slightly inferior.