Full name of flat-welded steel pipe flange with neck. English name: Slip-on, abbreviated as SO

Neck flat welding flange is the same as the plate flat welding flange, which is a flange that extends steel pipes, pipe fittings, etc. into the flange and connects with equipment or pipelines through fillet welds.

The sealing surface forms of flat-neck welding flanges are:

 Raised surface (RF), concave surface (FM), convex surface (M), tenon surface (T), groove surface (G), full surface (FF).

The diameter range of flat welding flange with neck: DN10~DN600

Scope of application: PN series PN2.5~PN40; Class series Class150~Class1500

 Flange material: carbon steel, molybdenum steel, 304, 316, 304L, 316L, 321, 347, CF8C.

Manufacturing process: forging.

Advantages: Flat-welded flanges with necks are also flat-welded flanges, because they have a short neck, which increases the strength of the flange and improves the load-bearing strength of the flange. So it can be used in higher pressure pipelines.
Disadvantages: The cost is higher than the plate-type flat welding flange, and it is easier to bump during transportation due to the characteristics of its shape.


The common domestic manufacturing standards are:

  national standards of People's Republic of China

 GB/T 9116-2010 Hubbed slip-on-welding steel pipe flanges;

 People's Republic of China Chemical Industry Standard

 PN series (European system) in HG/T20592~20635-2009 Table 8.2.2-1 ~ Table 8.2.2-5

 Class series (American system) in HG/T20592~20635-2009 Table 8.2.1-1~Table 8.2.2-6

HECHENG CENTURY METAL TECH CO.,LTD.,mainly produces heat-resistant steel casting, wear-resistant steel casting, corrosion-resistant steel casting,
sand casting, centrifugal casting, precision casting, forging, riveting and welding production, machining, heat treatment, final assembly, etc.
Our workshops are equipped with various modern processing equipment, static casting has the production capacity of single castings from 0.5Kg to 8000Kg;
silica sol casting has the production capacity of single castings from 0.05Kg to 500Kg; the production capacity of centrifugal casting is from φ50-φ1600,
and the forging workshop has forging orders The capacity of pieces is 5000Kg; it can be produced according to user's technical requirements.

In order to ensure the excellent performance of the product, it is equipped with complete testing methods such as desktop spectrometer, portable spectrometer,
 pendulum impact machine, non-destructive testing, large-scale water pump test bench, etc.
 The company's physical and chemical laboratory can accurately test C, S, P, Cr at any time , Ni, Si, Mn, W, Mo, V, N and other 24 kinds of elements,
and can carry out a variety of tests such as mechanical properties, physical properties, and auxiliary products. Complete testing methods, quality assurance, and system standardization.

Our company's products are widely used in heat treatment, metallurgical equipment, power equipment, mining equipment, petrochemical equipment, etc.
The main products are:
Furnace accessories: casting tray, cast baskets, casting fixtures, fan wheel, chain belt, muffle tank, heat exchanger, etc.
Sink rollers, stabilizing rollers, support rollers, support arms, cobalt bushes and sleeves for hot-dip galvanizing production lines.
Bottom rollers, radiant tubes, etc. for heat treatment furnaces in plate plants.
Water beam for the roller conveyor (cantilever roller) of the rolling mill walking furnace; the water beam slider for the furnace door, furnace door frame, and steel pushing furnace.

Petrochemical castings, high-temperature alloy furnace tubes, conversion tubes, cracking tubes, cast tube sheets, tube racks, etc.
Heat-resistant steel components used in the sintered pellet production line: such as chain links, grate plates, sprockets, shovel plates, side plates, small shafts, etc.
Calender rolls, flat drawing rolls, turning rolls, annealing furnace bottom rolls, cobalt alloy spinner discs, etc.
The roller ring furnace bottom roller used in the silicon steel plate line, W, U, I type radiant tube.
Cantilever rolls, air-cooled rolls, alignment rolls, spinning guide rolls, etc. for rods and wires.
Continuous annealing for steel pipe factory: hearth roll, straightening roll, sizing roll, two-roll cold rolling die, mandrel, guide plate, piercer roll, etc.

The company has always adhered to the business philosophy of "Sincere Service, Concentrating Customers"
and the quality policy of "pursuing a high starting point, creating zero defects, and satisfying customers."