What should you pay attention to when purchasing lifting hooks?
1. Safety performance defects; hook defects shall not be supplemented by welding; the surface of the hook should be smooth and free of defects such as cracks, folding, acute angles, burrs, peeling, excessive combustion, etc.
2. Within a short distance of the hook opening, two signs that are not easy to wear can be selected to measure the distance of the signs as the basis for detecting whether the opening degree changes during use. The hook material can be made of 20 preferred carbon steel or C-type hook special materials such as DG20mn, DG34crmo, etc.
3. The plate hook material generally uses A3.C3 ordinary carbon steel or 16mn low alloy steel. The longitudinal axis of the plate hook must be located in the rolling direction of the steel plate, and the hooks must not be spliced. The plate hook is riveted with countershot rivets, and the high-stress bending parts in contact with the lifting point of the plate hook shall not be connected with rivets. Fully closed welding is not allowed between the plate hook laminations, only intermittent welding is allowed.
4. The hook that has undergone an overload test should be scrapped.
5. 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 letter M.P.S.T. The basic design load of the hook is equal to the test load. Requirements for steel by M.P.S.T Class 4 hook: Steel should be made of a flat furnace, an electric furnace and an oxygen top blowing converter; steel should be calm steel, with good forging and can meet the mechanical properties specified in the standard after appropriate heat treatment; when the steel is tested according to YB/T5148, it should reach the austenite No. 5 grain size or finer grade.
The above is some introduction to the content you should pay attention to when purchasing lifting hooks, you can learn about it!
1. Safety performance defects; hook defects shall not be supplemented by welding; the surface of the hook should be smooth and free of defects such as cracks, folding, acute angles, burrs, peeling, excessive combustion, etc.
2. Within a short distance of the hook opening, two signs that are not easy to wear can be selected to measure the distance of the signs as the basis for detecting whether the opening degree changes during use. The hook material can be made of 20 preferred carbon steel or C-type hook special materials such as DG20mn, DG34crmo, etc.
3. The plate hook material generally uses A3.C3 ordinary carbon steel or 16mn low alloy steel. The longitudinal axis of the plate hook must be located in the rolling direction of the steel plate, and the hooks must not be spliced. The plate hook is riveted with countershot rivets, and the high-stress bending parts in contact with the lifting point of the plate hook shall not be connected with rivets. Fully closed welding is not allowed between the plate hook laminations, only intermittent welding is allowed.
4. The hook that has undergone an overload test should be scrapped.
5. 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 letter M.P.S.T. The basic design load of the hook is equal to the test load. Requirements for steel by M.P.S.T Class 4 hook: Steel should be made of a flat furnace, an electric furnace and an oxygen top blowing converter; steel should be calm steel, with good forging and can meet the mechanical properties specified in the standard after appropriate heat treatment; when the steel is tested according to YB/T5148, it should reach the austenite No. 5 grain size or finer grade.
The above is some introduction to the content you should pay attention to when purchasing lifting hooks, you can learn about it!
1. Safety performance defects; hook defects shall not be supplemented by welding; the surface of the hook should be smooth and free of defects such as cracks, folding, acute angles, burrs, peeling, excessive combustion, etc.
2. Within a short distance of the hook opening, two signs that are not easy to wear can be selected to measure the distance of the signs as the basis for detecting whether the opening degree changes during use. The hook material can be made of 20 preferred carbon steel or C-type hook special materials such as DG20mn, DG34crmo, etc.
3. The plate hook material generally uses A3.C3 ordinary carbon steel or 16mn low alloy steel. The longitudinal axis of the plate hook must be located in the rolling direction of the steel plate, and the hooks must not be spliced. The plate hook is riveted with countershot rivets, and the high-stress bending parts in contact with the lifting point of the plate hook shall not be connected with rivets. Fully closed welding is not allowed between the plate hook laminations, only intermittent welding is allowed.
4. The hook that has undergone an overload test should be scrapped.
5. 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 letter M.P.S.T. The basic design load of the hook is equal to the test load. Requirements for steel by M.P.S.T Class 4 hook: Steel should be made of a flat furnace, an electric furnace and an oxygen top blowing converter; steel should be calm steel, with good forging and can meet the mechanical properties specified in the standard after appropriate heat treatment; when the steel is tested according to YB/T5148, it should reach the austenite No. 5 grain size or finer grade.
The above is some introduction to the content you should pay attention to when purchasing lifting hooks, you can learn about it!
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