In
the process of processing, we will find that 304 stainless steel capillary will
have defects of the surface such as edge cracks, scarring, inclusions and
scarring. The causes of these defects are roughly the transverse cracks in the
subcutaneous corner of the outer arc of the billet, fine impurities mixed in
the crystallizer, the unclean oxide slag on the surface of stainless steel tube
during finishing, and problems caused by the rollover of billet edge to the
surface of stainless steel tube in rolling treatment. These defects not only
reduce the surface quality of stainless steel tubes, but also affect the
quality of products. Therefore, it is very important to prevent and treat the
surface defects of 304 stainless steel capillaries in time. The ability of a
metal material to resist the collapse of a hard surface is called hardness. Quality
boiler tubes for sale!
According to different test methods and application scope, hardness can be
divided into Brinell hardness, Rockwell hardness, Vickers hardness, Shore
hardness, micro hardness, high temperature hardness and so on. Brinell
hardness, Rockwell hardness and Vickers hardness are commonly used for pipes.
A
steel ball or cemented carbide ball with a certain diameter is pressed into the
surface of the sample with the prescribed test force (F). After the prescribed
holding time, the test pressure is removed and the indentation diameter (L) of
the sample surface is measured. Brinell hardness is a quotient obtained by
dividing the test force by the indentation spherical surface area.
In terms of
HBS (steel ball), the unit is N/mm2 (MPa).
Boiler tube is
a kind of seamless tube. The manufacturing method is the same as seamless pipe,
but there are strict requirements for steel grades used in manufacturing steel
pipe. According to the using temperature, it can be divided into generalboiler tubeand high pressure boiler tube.The mechanical properties
ofboiler tubesare important
indicators of service performance (mechanical properties), which depend on the
chemical composition of steel and heat treatment system. In the standard of the
steel pipe, according to the requirements of different application, the tensile
properties (tensile strength, yield strength or yield point, elongation),
hardness and toughness indexes, as well as the high and low temperature
properties required by users are specified.
There are high-quality boiler tubes for sale in the
company. Welcome to consult.
