When direct-buried anchor bolts (ie dead bolts) are used, a certain length of casing (PVC pipe) should be installed. In this way, on the one hand, the constraint can be reduced, leaving a space for plastic elongation for the high-strength anchor bolts; on the other hand, the surface of the bolt can be protected from being scratched. The anisotropy in the hot-worked forged material is relatively strong. Therefore, for the blank of the anchor bolt having a relatively large diameter, a round steel in a rolled state should be used. When using forgings, it is important to note that there is a sufficient forging ratio. When machining for machining, pay attention to the reasonable arrangement of the process, the balance between the processes and the heat treatment between the processes to reduce the machining stress, machining cracks, and the like. The thread is rolled and the turning is not used as much as possible, which not only maintains the continuity of the fiber, but also avoids stress concentration at the root of the thread. Non-destructive testing Proper non-destructive testing should be arranged between machining operations, such as magnetic particle inspection, ultrasonic flaw detection, etc., to determine whether the degree of surface cracks or internal defects of the workpiece is within the allowable range.
Standards must fully understand the guiding role of various standards in design and manufacturing. Although there is no national standard for high-strength anchor bolts, the national standard has clear provisions for high-strength bolts for steel structures, and it is helpful for the selection of high-strength anchor bolts. The breakage of the anchor bolts is a low stress brittle fracture caused by insufficient toughness. Improper material selection is fundamental, and the wrong heat treatment and installation prompts it to happen. The selection of high-strength steel materials should pay more attention to the matching of strength and toughness. The quenched structure should be low carbon martensite or lower bainite. Attention should also be paid to the size effect of the material. Parts of high-strength steel materials should be considered in terms of design, manufacture, installation, etc. in order to be effective.
MainType of Rail Clamps
*South/North America
1. Application:
Used for fixing crane rail tracks at port and factories.
2. Size
No.62, No.114, No.103, No.106, No.120
3. Material
Mild steel
|
Chemical composition |
C |
Si |
Mn |
P |
S |
|
≤0.20% |
≤0.35% |
≤1.4% |
≤0.045% |
≤0.045% |
|
|
Mechanical properties |
Tensile strength |
Yield strength |
Hardness (HB) |
|
|
|
370-500MPa |
≥235MPa |
≥120 |
|
|
4. Manufacture method
Hot forging
5. Mark
Manufacture ID, Product ID
6. Coating
Plain, zinc plated, Hot dip galvanized.
7. Supply reference
1) USA
2) Chile
*Africa
1. Application:
Used for fixing crane rail tracks at port and factories.
2. Size
K.R. type A, K.R. type B, K.R. type K
3. Material
Middle carbon steel
|
Chemical composition |
C |
Si |
Mn |
P |
S |
|
0.42-0.5% |
0.17-0.37% |
0.5-0.8% |
≤0.035% |
≤0.035% |
|
|
Mechanical properties |
Tensile strength |
Yield strength |
|
|
|
|
≥690MPa |
≥483MPa |
|
|
|
4. Manufacture method
Hot forging
5. Mark
Manufacture ID, Product ID
6. Coating
Plain, zinc plated, Hot dip galvanized.
*Europe
1. Application:
Used for fixing crane rail tracks at port and factories.
2. Size
M10, M12, M12 LA, M12 LAS
3. Material
Middle carbon steel
|
Chemical composition |
C |
Si |
Mn |
P |
S |
|
0.42-0.5% |
0.17-0.37% |
0.5-0.8% |
≤0.035% |
≤0.035% |
|
|
Mechanical properties |
Tensile strength |
Yield strength |
|
|
|
|
≥600MPa |
≥355MPa |
|
|
|
4. Manufacture method
Hot forging
5. Mark
Manufacture ID, manufacture month and year
6. Coating
Plain, zinc plated, Hot dip galvanized.
7. Supply reference
1) German
Rail Clamp,Railway Track Clamps,Railroad Rail Clamps,Mth Rail Clamp
TAICANG ZHONGBO RAILWAY FASTENING CO., LTD. , https://www.railfastener.com