Crane hook grade and material requirements
The grade of the hook depends on the mechanical properties of the finished hook. The rated lifting weight and grade are specified by the values of the rated lifting weight and test load, and are represented by the letters M, P, S, and T respectively.
The basic design load of the hook is equal to the test load (Fe).
The requirements for steel for hooks of four grades: M, P, S, and T:
1) The steel should be made of a flat furnace, an electric furnace and an oxygen top-blowing converter;
2) The steel should be calm steel with good forgings and can meet the mechanical properties specified in the standards after appropriate heat treatment;
3) When the steel is tested according to YB/T5148, it should reach a grade of austenite No. 5 grain size or finer.
Note: S and T grade hooks require higher steel.
The alloy steel used for S-class hooks should contain at least one of the following elements: nickel, chromium, molybdenum or elements of the same properties.
The alloy steel used for T-class hooks should contain at least two of the following elements: nickel, chromium, molybdenum, boron or elements of the same properties.
The grade of the hook depends on the mechanical properties of the finished hook. The rated lifting weight and grade are specified by the values of the rated lifting weight and test load, and are represented by the letters M, P, S, and T respectively.
The basic design load of the hook is equal to the test load (Fe).
The requirements for steel for hooks of four grades: M, P, S, and T:
1) The steel should be made of a flat furnace, an electric furnace and an oxygen top-blowing converter;
2) The steel should be calm steel with good forgings and can meet the mechanical properties specified in the standards after appropriate heat treatment;
3) When the steel is tested according to YB/T5148, it should reach a grade of austenite No. 5 grain size or finer.
Note: S and T grade hooks require higher steel.
The alloy steel used for S-class hooks should contain at least one of the following elements: nickel, chromium, molybdenum or elements of the same properties.
The alloy steel used for T-class hooks should contain at least two of the following elements: nickel, chromium, molybdenum, boron or elements of the same properties.
The grade of the hook depends on the mechanical properties of the finished hook. The rated lifting weight and grade are specified by the values of the rated lifting weight and test load, and are represented by the letters M, P, S, and T respectively.
The basic design load of the hook is equal to the test load (Fe).
The requirements for steel for hooks of four grades: M, P, S, and T:
1) The steel should be made of a flat furnace, an electric furnace and an oxygen top-blowing converter;
2) The steel should be calm steel with good forgings and can meet the mechanical properties specified in the standards after appropriate heat treatment;
3) When the steel is tested according to YB/T5148, it should reach a grade of austenite No. 5 grain size or finer.
Note: S and T grade hooks require higher steel.
The alloy steel used for S-class hooks should contain at least one of the following elements: nickel, chromium, molybdenum or elements of the same properties.
The alloy steel used for T-class hooks should contain at least two of the following elements: nickel, chromium, molybdenum, boron or elements of the same properties.
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