How to detect welded steel pipe hardness

How to detect welded steel pipe hardness

Welded with steel plates or steel after bending , then welded steel. Press the seam into the form of longitudinally and spirally welded pipe . Divided according to purpose and general welded pipe, galvanized pipe , oxygen pipe, wire casing , metric pipe , roller pipe, deep well pump tube , automotive tube , transformer tube , welding thin-walled tube , welding shaped tube and spiral welded pipe . General Pipe : Average pipe used to transport low pressure fluid . With Q195A, Q215A, Q235A steel. Easy welding may also be used in other soft steel. Pipe to carry water pressure, bending , flattening and other experiments , there are certain requirements for surface quality , delivery is usually a length of 4-10m, often required length ( or double length ) delivery. Pipe specifications expressed with nominal diameter ( mm or inch ) nominal diameter different from the actual , pipe wall thickness according to the provisions of ordinary steel and thicker steel are two forms of steel pipe end divided by threaded and non- threaded two kinds .

Following is a brief introduction to the application of several pipe

 

1 , generally used for water, gas , air, oil and heating steam and other general low pressure fluid delivery.

 

2 , ordinary carbon steel wire casing (GB3640-88) is an industrial and civil construction, installation of machinery and equipment for the protection of electrical installation engineering steel wires .

 

3 , straight seam welded pipe (YB242-63) is parallel to the longitudinal weld steel pipe and steel pipe . Usually divided into metric welded tubes, welded thin-walled tube , transformer cooling pipes and so on.

 

4, the pressure transmission fluid with spiral submerged arc welded pipe (SY5036-83) is a hot-rolled steel strip coils for the tube , often warm spiral shape , with double-sided submerged arc welding method for pressure fluid transfer spiral pipe joints . Strong pressure steel , welding performance, through a variety of rigorous scientific examination and testing , the use of safe and reliable. Large diameter steel pipe , transmission efficiency, and can save the laying of pipeline investments. Mainly used to transport oil , natural gas pipelines .

 

5, the pressure transmission fluid with high-frequency spiral welded pipe (SY5038-83) is a hot-rolled steel strip coils for the tube , often warm spiral shape , lap welding method with high frequency welding , pressure fluid transport frequency spiral welded steel pipe. Strong pressure steel , plastic, and easy welding and machining molding ; through a variety of rigorous and scientific examination and testing , the use of safe, reliable, large diameter pipe , transmission efficiency, and save the laying of pipeline investments. Mainly used for laying transport oil, natural gas and other pipelines .

 

6 , the general low pressure liquid delivery spiral submerged arc welded pipe (SY5037-83) is a hot-rolled steel strip coils for the tube , often warm spiral shape , using double-sided automatic submerged arc welding or welding into the legal system for water, gas , air and steam low pressure liquid delivery SAW pipe.

 

Pipe can be used cloth, Luo, Victoria three kinds of hardness test method for the determination HB, HRB ( or HRC) and the HV hardness value, three kinds of hardness values measured only one can be. The latest development of portable surface Rockwell hardness tester, Rockwell hardness pipe , can be fast, accurate hardness testing , making it difficult in the past to solve the problems in China .

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