In this episode,
we will talk about the process variables of heat shrinkage cracking.
I. Chemical composition:
Sulfur: Sulfur content increases thermal cracking,
which is the main variable.
Phosphorus: Increasing phosphorus content also increases thermal cracking,
but the effect is less than that of sulfur,
but this is also the main variable.
Manganese: if manganese sulfur is too high,
manganese has little effect on thermal shrinkage cracking.
Nickel: within 3%, no impact
Two: deoxygenation operation:
a. Type I globular sulfide is formed
when the residual amount of aluminum is 0 to 0.005%.
b. Type II thin-film or chain sulfide is formed
when the residual amount of aluminum is 0.002 to 0.015%
c. Type III angular sulfide is formed when the residual amount of
aluminum is greater than 0.01%.
d. Steel castings containing type II sulfide are sensitive to
heat shrinkage and cracking.
In the next installment, we will continue to
talk about the factors that affect the process of heat shrinkage.
we will talk about the process variables of heat shrinkage cracking.
I. Chemical composition:
Sulfur: Sulfur content increases thermal cracking,
which is the main variable.
Phosphorus: Increasing phosphorus content also increases thermal cracking,
but the effect is less than that of sulfur,
but this is also the main variable.
Manganese: if manganese sulfur is too high,
manganese has little effect on thermal shrinkage cracking.
Nickel: within 3%, no impact
Two: deoxygenation operation:
a. Type I globular sulfide is formed
when the residual amount of aluminum is 0 to 0.005%.
b. Type II thin-film or chain sulfide is formed
when the residual amount of aluminum is 0.002 to 0.015%
c. Type III angular sulfide is formed when the residual amount of
aluminum is greater than 0.01%.
d. Steel castings containing type II sulfide are sensitive to
heat shrinkage and cracking.
In the next installment, we will continue to
talk about the factors that affect the process of heat shrinkage.
