Shijiazhuang Metalsin is a professional manufacturer of forged steel flanges and holds a large volume of ASTM A105 flanges available in stock. The entire manufacturing processes are presented as follow:
Step 1: raw material preparation. These A105 billets are procured from a prominent steel mill TISCO. The production process of the steel is under the supervision of TUV inspectors for 3.2 Certificate.
Step 2: the A105 square bars shall be cut into appropriate length by a hacksaw machine.
Step-3: the cut A105 steel billets shall be preheated in the furnace to a temperature above the recrystallization temperature. The billets shall be soaked in the furnace for a time period long enough so that the entire material is completely heated.
Step 4: as illustrated in Step-4a and Step-4b, die forging or open-die forging shall be performed for the fabrication of small-size or large-size ASTM A105 flanges, respectively. Since the forging is done immediately after the preheating above the recrystallization temperature, it is also known as hot forging or hot working. At the high temperature, the A105 material has a low strength and can be deformed readily.
Step-5: the as-forged A105 flange shall be turned by a CNC machine. The drilling of bolt holes shall be performed subsequently to get proper dimensions in accordance with relative standard specifications such as ASME B16.5, ASME B16.47, or EN 1092-1, etc.
Step-6: the marking process for ASTM A105 flanges. Typical marking shall include “brand name + size + class rating + material specification + standard specification + flange & facing type + heat number”.
Step-7: proper coatings on the flange surface shall be conducted for corrosion-resistance purpose. The typical coating methods may be black painting, golden yellow painting, anti-rust oil coating, or galvanization.
The ASTM A105 flanges are generally packaged by sea-worthy firm plywood cases for delivery.