Alloy plate belongs to ultra-high strength steel, with high strength and toughness,
better hardenability, no obvious temper brittleness, after quenching and tempering treatment, higher fatigue limit and resistance to multiple impact ability, low temperature impact toughness is good.
The steel is suitable for manufacturing large and medium-sized plastic moulds
with certain strength and toughness.
Corresponding to Shoute Steel: 42CRMO, corresponding to Germany: 42CRMO4, corresponding
to the United States: 4140, corresponding to Japan SCM440.
The alloy plate is heated to the temperature above 30 ~ 50℃ where all ferrite
is converted into austenite. The alloy plate is held for a period of time and then cooled slowly with the furnace. During the cooling process, the austenite changes again, which can make the steel microstructure become fine.
The workpiece is heated to the temperature of 20 ~ 40℃ above which the alloy
plate begins to form austenite. After the heat preservation, it is cooled slowly. During the cooling process, the laminar cementite in the pearlite becomes spherical, thus reducing the hardness.
Elongation of alloy plate
The alloy plate plays an important role in all kinds of operation. The alloy
content in the alloy plate is relatively low.
Alloy plate in a variety of operations and applications is to do a more detailed
overview of its elongation, about its elongation is accompanied by its length, performance, hardness and a variety of indicators for comprehensive evaluation.
Elongation refers to the percentage of the initial length of the section of the
metal after the fracture of the pattern during tensile tests.
Let's use the symbol delta.
Elongation reflects the plastic size of the material, the greater the elongation,
the greater the plasticity.
Metal materials subjected to external forces (tensile), the breakage of the test
bar length and the length of elongation percentage, elongation in accordance with the test bar length is divided into: short for the elongation test bar, known as the delta 5, test bar scale distance equal to five times
the diameter, long for the elongation test bar, 10, known as the delta test bar scale distance equal to 10 times the diameter of its or his successful bid is used to determine the specimen strain or length change of part
of the original length.
The elongation of alloy plate and ordinary metal is not so long, so it is recommended that manufacturers in the operation of the time to be
able to do!
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