Round Bar Prime Quality 45mn
round-bar-prime-quality-45mn
1, the raw materials of the chain are mainly 45# steel, A3 steel is also used.
2, mainly according to the tension to determine what material to use steel. Usually, the chain plate uses 45Mn2 tempering treatment on the material, and the hard shield is HRC62. Recently, high alloy steel materials such as 20CrMnTi have been used, which has good mechanical properties and longer service life. The pin is made of 45 steel or 40Cr tempering treatment, and its quenching hardness is HRC38-43.
45Mn mechanical property
| strength of extension σb Mpa |
Elongation or elongation after breaking δ % |
|---|---|
| ≥620 | ≥15 |
① The steel plate delivered in the heat treatment state, when its elongation is increased by more than 2% (absolute value) than specified in the table, the tensile strength ratio is allowed to be reduced by 40MPa.
When the thickness of the steel plate and steel strip is greater than 20mm, the elongation after breaking is allowed to be reduced by 0.25% (absolute value) for every 1mm increase in thickness, the total reduction value of the thickness is not greater than 32mm shall not be greater than 2% (absolute value), and the total reduction value of the thickness is greater than 32mm shall not be greater than 3% (absolute value).
③ By agreement between the supply and demand parties, steel with a thickness of not less than 6mm can be used for 20°C or -20°C low-temperature impact test, and the test temperature and impact absorption energy of other grades are agreed by the two parties.
④ Heat treatment refers to normalizing, annealing or high temperature tempering.
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