Forged Flanges

A forged flange starts life as a blank that was hammered or pressed into shape while the steel was hot, instead of being cut out of rolled plate. The forging is then turned, faced and drilled to size. Because the metal is worked hot, the grain follows the shape of the flange rather than running straight through it, and any porosity in the original stock is closed up — which is why pressure piping specifications usually call for a forged flange rather than a plate-cut one. I.S. Engineering Co. supplies forged flanges from Darukhana, Mumbai in mild steel IS:2062 and stainless SS 304 / 304L / 316 / 316L, 15mm to 600mm NB.

Five — forged weld neck, forged blind, forged slip-on, forged socket weld and forged threaded. Each one starts as a forged blank and is then machined at our Mumbai works to the facing, the drilling and, on a weld neck, the bore you nominate. Anything outside those five, or any drilling that is not to a standard table, is made to your drawing.

Order forged when the specification, the piping code or the pressure class asks for it, and plate-cut when it does not. On a low-pressure water, air or slurry line drilled to Table D or Table E, a plate-cut flange is ordinary Indian practice and there is nothing to gain by paying for a forging. Where the line carries steam, gas or hydrocarbon, or where the job is written to ASME B31.1 or B31.3, the specification will name a forging and that settles it. If you are not sure which side of that line your job falls on, send us the specification page and we will tell you what it is asking for.

No. They are different specifications and they are not interchangeable. IS:2062 is an Indian structural steel and it is the grade our standard M.S. flanges are made from. ASTM A105 is an American specification written specifically for forged carbon steel piping components, with its own chemistry limits and its own testing. If your specification says A105, say so on the enquiry and we will work from A105 material and hand over the mill test certificate against it. Nobody should substitute one grade for the other on a pressure line without the consultant’s written approval.

Class 150, Class 300 and Class 600 are the classes we make as routine work, alongside the BS 10 lettered tables D, E, F and H. Class 900 and above we quote case by case against your drawing, the material specification and the certification you need, because the blank, the machining and the testing all have to be arranged for that particular order. We would rather quote those honestly than list them and let you down on delivery.

15mm NB to 600mm NB is the standard range we work in. Above 600mm NB, and for any non-standard outside diameter, thickness or drilling, we work to your drawing — send a sketch with the OD, the PCD, the number and size of holes, the thickness and the facing, and we will confirm it back in writing before anything is cut.

Whatever table or class you nominate. The grid published on this page is BS 10 Table E for 15mm to 600mm NB, giving the flange outside diameter, the bolt pitch circle, the number of holes, the hole diameter, the bolt size and the thickness. Table D, Table F, Table H and the ASME B16.5 class charts are sent on request rather than published here, so that you are quoting from the sheet that matches your job.

Yes — SS 304, 304L, 316 and 316L, in the same five sub-categories as the mild steel range. Stainless work is kept away from mild steel swarf so the machined faces are not contaminated, and stainless flanges are marked and packed separately from M.S. items in the same consignment. Tell us the grade at enquiry stage, because 316 stock costs appreciably more than 304 and the rate moves with it.

Yes, if you ask for it at order stage. We issue a material test certificate traceable to the mill certificate of the stock the flange was made from. If your client requires third-party inspection, name the agency on the purchase order so the inspection can be built into the machining schedule instead of holding up despatch at the end.

From Darukhana, Mumbai to the whole of India, and by sea to the Gulf. Local delivery across Mumbai, Navi Mumbai, Thane, Bhiwandi, Taloja, Ambernath, Pune, Nashik, Aurangabad and Nagpur; regular despatch to South India — Chennai, Coimbatore, Madurai, Tiruchirappalli, Hosur, Bengaluru, Hyderabad, Visakhapatnam, Kochi and Mangaluru — and to Ahmedabad, Vadodara, Surat, Indore, Raipur, Jaipur, Delhi NCR, Kanpur, Kolkata, Bhubaneswar and Guwahati. Export orders for Dubai and the wider UAE, Oman, Qatar, Kuwait and Saudi Arabia move through Nhava Sheva (JNPT) and Mumbai Port.

Send the size in NB, the class or table for the drilling, which of the five types you want, the facing, the grade, the certification you need and the quantity. WhatsApp +91 99220 47887 or email sales.isengineeringco@gmail.com. A specification page or a drawing is enough. We are at Gala No 10, Plot No 255, Mehta Lane, Kolsa Bunder, Darukhana, Rey Road, Mumbai 400010, open Monday to Saturday, 9:00 to 18:30.