C&N HUITONG limited are leading steel pipe,fitting and flange Supplier since 1997.
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Flange manufacturing process

The Flanges Manufacturing Process is mainly divided into forging, casting, cutting and rolling.

Casting flange is a generally used flange technology, which has the advantages of high production efficiency and low production cost, and is vey suitable for medium and low pressure pipelines.

The casting flange is made of iron filings. After the iron is melted, the molten iron is poured into the mold, cooled, and processed. In Some procedures are to pour the molten iron into the mold and heat it in the forging after molding.

Cutting process is a process refers to manufacturing flanges by cutting stripes from the middle plate and then rolling them into round shape. This Cutting process is mainly used for the manufacturing of large flange. After all other processes and rolling process, weld and then compress the round shape, and finally process the serrated spiral finish and bolt hole.

Understanding Clients requirement and ensuring to supply as per these requirements is realized with the help of quality assurance at Steel Flange Mfg one of the best Stainless Steel Flanges Manufacturers in India, our product range include all types of flanges such as MS Flange ( Mild Steel ) , Raised face flange , Ring Type Joint Flanges, Weld neck flange and Flanges according to clients requirement.

Our industrial process is extremely experienced and is divided into various departments managed by knowledgeable industry specialists. We use only best quality raw materials that are obtain from only well-known and consistent businessperson. We have accept demanding quality control practices and procedures to guarantee the manufacture of only best quality products matching industry standards and parameters.

Our latest machining and gathering processes have a comprehensive line of metal removal equipment including grinding, polishing, turning, boring, milling, drilling, welding and have testing apparatus to manufacture Stainless Steel Flanges & pipe fittings. The facility also include all the required equipment to support and handle these processes as well as work holding and cutting tool requirements.

Raw Materials:

Beginning with this process, the system controls the quality of all incoming materials as per the raw material test certificate of the material. Checking in each size for chemical and physical properties of these materials at Government approved laboratory.

Processing System:

At the raw material stage, the same is checked visually for any kind of surface defects such as cracks, seams, overlapping, pitting, as well as dimensionally. A chemical & physical test is carried out before selecting the Raw material.

After acceptance of raw material, a control number is issued and this is punched/marked on the whole of the Raw material is to use.

In manufacturing of flanges. At the time of cutting, The control number is transferred on each cut pieces and the same is transferred after every operation of forging or forming in the case of Invisibility of the same. After each forging or Forming process, the material is checked visually for surface crack.

Heat treatment is carried out after final forging or forming as required by the code. After final forging or heat treatment, a batch number is assigned to a lot and this batch number is stamped on each flanges. and on the temperature chart which is automatically generated by temperature recorder coupled with the heating furnace. Time of final forging/forming & date is also mentioned on the chart.


After final forging/forming and Heat treatment process, all the flanges. are sent for machining i.e. and preparation, O/D and I/D matching as per dimensional codes. An Expert Q.C. engineer is involved and he keeps a constant vigil on every machining operation. Step machining is carried out as required by the codes. GO and NO-GO gauges are used to check the O/D & I/D of the fittings, Flanges, Etc.flange-machining


The tensile test is done on a sample taken from mother Raw material or from the lots of flanges. in accordance with codes as required by the purchaser on a universal testing machine which is calibrated & approved by the authorized inspection agencies.

Hardness testing is done on At least 10% of each lot & results are recorded in the separate register.

100% X-Ray examination is carried out on all flanges.

flange MT inspection
flange MT inspection


All Steel flanges, are pickled and passivated by pickling all the scale is removed which is formed during forging/ Forming operations. After pickling, Grinding operation is done to remove the die mark and inside / outside burrs formed during forming & machining operation. Dimensional check is carried out finally & recorded.


After the final dimensional check each fitting is stamped /marked for size, schedule, Fittings specification, Heat mark & batch number.

Flange marking

Steel Flanges must be packed with seaworthy packing method then delivery to clients, generally the packing way include wooden box, iron & steel cage, wooden pallet, iron & steel pallet etc. Because of the normal wooden boxes or pallets have to do fumigation treatment, we generally use plywood pallet or plywood case or box to pack SS flanges without fumigation treatment.




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