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Difference between Submerged Arc Welding and High Frequency Welding
Submerged arc welding is an arc welding under flux layer combustion method. Welding arc between the wire and the weldment burning heat of the arc and arc welding wire ends near the base metal and solder melts, continue feeding the wire, and proceeds along a certain trajectory, an arc weld pool so...Read more -
Overall Hardening of Steel
With the rapid development of China’s oil industry, the demand for high-grade steel is growing, and high-grade steel must be quenched, and therefore the study of the overall quenching of steel is very important. China Heavy Machinery Research Institute has developed a “dip quenching +...Read more -
Steel management performance inspection
① Tensile test: measure stress and deformation, determine the strength (YS, TS) and plasticity index (A, Z) of the material Longitudinal and transverse specimen pipe section, arc, circular specimen (￠10,￠12.5) Small-diameter thin-walled steel pipes, large-diameter thick-walled steel pipes, and ...Read more -
It is expected that the price of Huazhong steel pipe will fluctuate within a narrow range tomorrow
On July 27, in terms of welded pipes and galvanized pipes, the black futures fluctuated upwards, the price of raw strip steel continued to rise, and the ex-factory prices of pipe factories also frequently increased, and some markets in Central China rose slightly. At present, the performance of t...Read more -
Processing Methods of Pipe Fittings
Processing methods of pipe fittings there are many. Many also belong to the scope of machining and the like, the most widely used method of stamping, forging method, roller processing method, rolling method, bulging France, stretching, bending method, and a combination of processing method. Tube ...Read more -
The Strip Width Deviation Affects the Quality of Welded Steel Pipe
Frequency welded pipe production process, affecting the quality of the elements have more than one pipe, the main raw materials, welding technology and roll count which is beginning to adjust. Key to look at raw geometric dimensions. Strip geometry affect the quality of the steel strip wid...Read more -
Deformation Strengthening of High-pressure Alloy Pipe
High-pressure alloy pipe deformation strengthening is using the method of deformation of steel reinforcement. Also known as the strain hardening or work hardening. The strength of the material at the macro (or a whole) the ability to resist deformation (or flow stress). Hardness is the ability of...Read more -
Reduction of Nb Steel Surface Cracks and Prevention Measures
Transverse cracks will affect the finished product rate just after rolling. Increase billet cleanup time, both great harm. The slab temperature is brittle zone of 700-900 ℃. The reason the lower surface cracks is 1050-1100 ℃, transverse cracks on the surface of the reason is the billet surface by...Read more -
Precision Tube length Measurement Method
According to the technological requirements of different manufacturers, precision tubes length measurement systems with a variety of length measurement methods. There are the following: 1, The grating length measurement The basic principle is: the outer ends of precision tubes are provided two fi...Read more