Forming Technologies

Cold Pressing

Taking advantage of the characteristics of plastic deformation of metal, the microscopic convex peaks on the surface of the workpiece are flattened by applying pressure, thereby reducing the surface roughness. High pressure is applied in the mold cavity to make a compact molded blank. Including surface rolling, surface extrusion processing, etc. Suitable for polycarbonate, polypropylene and other materials. By cold pressing processing, the tensile strength and elastic modulus of the material can be improved.

Comprehensive Size Ranges

The specifications and sizes of seamless eccentric heads DN15 to DN600 are as follows:

☆Outer diameter dimensions

DN15: The outer diameter is generally 22mm (large outer diameter series) or 18mm (small outer diameter series).
DN20: The outer diameter is 27mm (large outer diameter series) or 25mm (small outer diameter series).
DN25: The large outer diameter series is 34mm, and the small outer diameter series is 32mm.
DN32: The outer diameters are 42mm (large outer diameter series) and 38mm (small outer diameter series) respectively.
DN40: The large outer diameter series is 48mm, and the small outer diameter series is 45mm.
DN50: The corresponding outer diameters are 60mm (large outer diameter series) and 57mm (small outer diameter series).
DN65: There are two types of outer diameters: 76mm (large outer diameter series) and 73mm (small outer diameter series).
DN80: The large outer diameter series is 89mm, and the small outer diameter series is also 89mm.
DN100: The large outer diameter series is 114mm, and the small outer diameter series is 108mm.
DN125: The outer diameters are 140mm (large outer diameter series) and 133mm (small outer diameter series) respectively.
DN150: The large outer diameter series is 168mm, and the small outer diameter series is 159mm.
DN200: The outer diameter is 219mm, and the outer diameter series is the same.
DN250: The large outer diameter series is 273mm, and the small outer diameter series is also 273mm.
DN300: The large outer diameter series is 324mm, and the small outer diameter series is 325mm.
DN350: The outer diameters are 360mm (large outer diameter series) and 377mm (small outer diameter series) respectively.
DN400: The large outer diameter series is 406mm, and the small outer diameter series is 426mm.
DN450: The large outer diameter series is 457mm, and the small outer diameter series is 480mm.
DN500: The outer diameters are 508mm (large outer diameter series) and 530mm (small outer diameter series) respectively.
DN600: The large outer diameter series is 610mm, and the small outer diameter series is 630mm.

☆Wall thickness dimensions

DN15: The national standard wall thickness is generally 0.8mm.
DN20 - DN25: The wall thickness is usually 1.0mm.
DN32 - DN50: The wall thickness is generally 1.2mm.
DN65: The wall thickness is about 1.5mm.
DN80 - DN100: The wall thickness is about 2.0mm.
DN125 - DN200: The wall thickness is usually 2.5mm.
DN250 - DN300: The wall thickness is generally 3.0mm.

The detailed specifications and sizes of welding eccentric heads DN15 to DN1200 are as follows:

☆Outer diameter dimensions

DN15: The outer diameter is 21.3mm.
DN20: The outer diameter is 26.8mm.
DN25: The outer diameter is 33.5mm.
DN32: The outer diameter is 42.25mm.
DN40: The outer diameter is 48mm.
DN50: The outer diameter is 60mm.
DN65: Outer diameter is 75.5mm.
DN80: The outer diameter is 88.5mm.
DN100: Outer diameter is 114mm.
DN125: The outer diameter is 140mm.
DN150: Outer diameter is 165mm.
DN200: The outer diameter is 219mm.
DN250: Outer diameter is 273mm.
DN300: The outer diameter is 325mm.
DN350: Outer diameter is 377mm.
DN400: The outer diameter is 426mm.
DN450: Outer diameter is 480mm.
DN500: The outer diameter is 530mm.
DN600: Outer diameter is 630mm.
DN1200: The outer diameter is usually 1220mm.

☆Wall thickness dimensions

There is no strict fixing standard for the wall thickness of welding eccentric heads, and is affected by a variety of factors. The following are common references:

DN15 - DN20: The wall thickness is generally around 2.75 - 3.0mm.
DN25 - DN40: The wall thickness is usually 3.25 - 3.5mm.
DN50 - DN80: The wall thickness is about 3.5 - 4.0mm.
DN100 - DN150: The wall thickness is generally 4.0 - 4.5mm.
DN200 - DN300: The wall thickness is usually 6.0 - 8.0mm.
DN350 - DN600: The wall thickness is about 8.0 - 12.0mm.
DN600 or above: For example, DN1200, the wall thickness may be around 12.0 - 20.0mm.

Supports SCH5S-XXS pressure ratings, ideal for oil/gas pipelines and cryogenic applications.