GB/T 8162 Q345B Seamless Steel Pipes
Q345 has good mechanical properties, low temperature performance, plasticity and weldability.
GB/T 8162 Q345B Seamless Steel Pipes
Q345 is a low-alloy steel pipe that is widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, etc., where "Q" means yield strength, and 345 means that the yield strength of this steel is 345MPa.
The Q of Q345 seamless steel pipe represents the yield of this material, and the following 345 means that the yield value of the material is about 345, and as the thickness of the material increases, its yield value will decrease. According to the manufacturing process, it can be divided into hot-rolled seamless pipe and cold-rolled seamless pipe; according to the use, it can be divided into seamless steel pipe for general structure, seamless steel pipe for fluid transportation, seamless steel pipe for medium and low pressure boilers and high-pressure seamless pipe. Seamless steel pipes for boilers; according to material, they can be divided into high-quality carbon structural steel seamless steel pipes, low-alloy structural steel seamless steel pipes and alloy steel seamless steel pipes.
There are several key factors to pay attention to when manufacturing Q345B steel pipes. First of all, the uneven structure is often caused by the tube blank. Secondly, the annealing temperature of the finished product needs to be appropriate, the piercing heating temperature should be between 1230-1250 degree , and the heating time is generally more than 60 minutes. Finally, the cause of cracks also needs attention. Tests have proven that the inside of the tube blank (round steel) contains many cracks, inclusions, air pockets, etc. Improper adjustment of the perforation temperature and process will also cause the internal tissue of the capillary tube to tear.
GB/T 8162 Q345 seamless steel tubes chemical composition:
|
C |
P |
S |
V |
||||||||
|
Q345 |
0.2 |
1.00-1.60 |
0.55 |
0.04 |
0.04 |
0.02-0.15 |
0.015-0.060 |
0.02-0.20 |
- |
|
|
GB/T 8162 Q345 seamless steel tubes mechanical property:
|
Q345 |
Less than or equal to 16 |
>16-30 |
>30 |
|
|
|
325 Mpa |
315 Mpa |
305 Mpa |
490 Mpa |
21% |
|
Q345B seamless tube
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Q345 carbon steel?
A.The Q345 is a steel with less than 0.2 percent of its composition made up of carbon, less than 0.55 percent of its composition made of silicon and several impurities.
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