Q345B seamless steel pipe crack causes and common implementation standards
Q345B seamless steel pipe crack cause
The unevenness of the first tissue is the cause of the tube blank. 16Mn is the grade of the previous steel, it has long been changed to Q345B, it does not matter, pay attention to the choice of the implementation of the tube blank standard, a round steel produced by a certain scale of manufacturers.
The second finished annealing temperature is suitable. The perforation heating temperature is 1180~1230 °C, which is low. This is the temperature of medium carbon alloy steel. It is suitable for 1230-1250. Is 35min heating time or furnace time? The furnace time is generally above 60min.
Third, the cause of the cracks has been proved by experiments to be mostly due to the tube blank (round steel), which contains many cracks, inclusions, air bags and the like.
The temperature and process adjustment of the perforation can not be ignored. If the perforation temperature is low and the adjustment is improper, the internal tissue of the capillary tube will be torn.
Q345B seamless steel pipe execution standard
1. Structural seamless pipe (GB/T8162-2008) is a seamless steel pipe for general structural and mechanical structures.
2. Seamless steel pipe for fluid transportation (GB/T8163-2008) is a general seamless steel pipe for conveying fluids such as water, oil and gas.
3. Seamless steel pipe for low and medium pressure boilers (GB3087-2008) is a high quality carbon structural steel for the manufacture of superheated steam pipes, boiling water pipes and locomotive boiler superheated steam pipes and arch bricks for various structures. Rolled and cold drawn (rolled) seamless steel tubes.
4. Seamless steel pipe for high-pressure boiler (GB5310-2008) is a high-quality carbon steel, alloy steel and stainless steel heat-resistant steel seamless pipe for the heating surface of water tube boilers for high pressure and above.
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Tag: Seamless steel pipe Crack cause Medium pressure boiler Stainless steel heat resistant Fluid transport
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