Boiler pipe forming

Boiler pipe forming include fin tube, serpentine tube and reaming welding.

For example stave pipe in pipe welding corresponding sides made of slats or finned-tube, also known as "fin tubes."

The technical requirements galvanized steel pipe should reach.

Industrial boilers occupy a very important position in the modern energy industry, is a major industrial power or production equipment. In order to improve the thermal efficiency of the boiler, using a steel pipe manufacturing boilers, increasing heating area. Thus, in the medium and low pressure boiler or high pressure boiler works, boiler pipe accounts for a great part, about 30% to 60% of boiler steel, used as boiler engineering stave pipes, economizer tubes, heat exchanger tubes convection tubes, superheater tubes, etc., used in locomotive boiler opium pipe, small pipe and so on.

Boiler tubes need take for a variety of molding in the boiler manufacture and installation process ;

Stainless steel tube for heat exchanger

ASTM A556 / A556M – 96(2012) Standard Specification for Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes

The tube heat exchanger tubes often need to be processed into a certain shape, like snake collectively "serpentine";

welding locomotive boiler header tubes, both ends need to be processed after reaming.

Therefore, in order to detect boiler tube pipe processing technology performance, except for routine physical and chemical properties of the test, but still need to make the appropriate technology test.

The purpose of the test is to detect plasticity situation of boiler pipes in the process. Process test generally includes: upset test, bending test, necking test, flaring test, curling test and flattening test and so on.

  • grades and chemical composition. Galvanized steel grades and chemical composition shall comply with the stipulated GB3092 standard of black steel pipe steel.
  • the manufacture method: the manufacturing method of black steel pipe (furnace or electric welding) should be selected by the factory. Galvanized by hot dip galvanizing.
  • thread and pipe joint
    • delivery of galvanized steel pipe with screws, screw thread should be done after galvanizing. And the thread should comply with the provisions of the YB822.
    • steel pipe joint shall comply with the terms of YB238; Malleable iron pipe fittings shall comply with the terms of YB230.
  • the mechanics properties: the mechanical properties of steel tube before galvanized should comply with the provisions of the GB3092.
  • the uniformity of the galvanized layer: the galvanized steel pipe should be carried out galvanized layer uniformity test. Steel tube specimens in the copper sulfate solution dipping 5 consecutive shall not become red (copper plating color).
  • the nominal diameter of cold bending test no greater than 50 mm galvanized steel pipe should carry out cold bending test. Bending angle is 90°, bending radius is 8 times the diameter. Without padding when testing, sample welds should be placed in the bending direction of the lateral or upper. After the testing, the sample should not have cracks and zinc layer peeling off with the elephant.
  • hydrostatic test: water pressure test should be performed in the black steel pipe, eddy current flaw detection can also take place of hydrostatic test. Test pressure or eddy current inspection shall comply with the terms of GB3092 contrast sample size.

Steel mechanical properties is an important index to ensure that the steel eventually use performance, it depends on the chemical composition of the steel and heat treatment system.

In the steel tube standard, according to different application requirements, the tensile strength, yield strength or yield point, elongation and hardness, toughness index are all stimulated, and even the user's high, low temperature performance, etc.




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