Polished Black Mild Steel Tubes, For Bus Body Building, Fabrication, Transformer Industry, Feature : Fine Finishing

Sandco Metal Industries specialize in manufacturing of Black Steel Tubes (confirming to IS: 1239 (Part-1) 2004, Equivalent to BS : 1387) available in various grades and dimensions at affordable cost with no quality compromise. We are manufacturing ERW Black Mild Steel Tubes in size range of 15 mm NB to 150 mm NB in light, medium, heavy classes from past 25 years under supervision of technical experts with their expert guidance and support. Our Organization is ISO-9001:2008 certified with added advantage of products electro polishing, cutting as per customer requirements.
Black Steel Tubes are available at random lengths of upto 6 meter long or 20 feet long in Seamless / Welded / ERW. Black Steel Tubes can be offer at random short length or cut length to specific length as per order. We also have Specality in manufacturing and supply of custom sizes Black Steel Tubes as per requirements. Black Steel Tubes cold drawn seamless and welded tubes are available in ex-stock.
Mild steel contains 0.05–0.25% carbon making it malleable and ductile. It has a relatively low tensile strength and small percentage of carbon also known as low-carbon steel making it strong and tough. It is often used when large quantities of steel are needed, for example as structural steel. The density of mild steel is approximately 7.85 g/cm3 (7850 kg/m3 and the Young's modulus is 200 GPa (29,000,000 psi).
Black steel tubes are known in industry because of their properties that the steel used in their production need no galvanization .These tubes are called black mild steel due to scaly, dark-coloured iron oxide coating on its surface.
Seamless Black Steel Tubes
Seamless Black Steel Tubes Supplier, Seamless Black Steel Tubes Exporter, Seamless Black Steel Round Tubes, Seamless Black Steel Square Tubes, Seamless Black Steel Retangular Tubes, Seamless Black Steel Galvanised Tubes
Seamless Tubes are manufactured by using an extruded hollow tube or a drilled solid bar which then undergo various tube reduction processes to meet customers specifications.
Welded Black Steel Tubes
Welded Black Steel Tubes Supplier, Welded Black Steel Tubes Exporter, Welded Black Steel Round Pipes Tubes, Welded Black Steel Square Tubes, Welded Black Steel Retangular Tubes, Welded Black Steel Galvanised Tubes
Welded Tubes manufacturing process starts with cold rolled strip of metal, roll formed into tubular shape and seam welded without the use of any filler material which then undergo various cold working techniques like Pilgering, cold drawing etc., until it reaches the exact size, tolerances, and temper in accordance to customer’s specifications.
ERW Black Steel Tubes
ERW Black Steel Tubes Supplier, ERW Black Steel Tubes Exporter, ERW Black Steel Round Tubes, ERW Black Steel Square Tubes, ERW Black Steel Retangular Tubes, ERW Black Steel Galvanised Tubes
ERW Tubes manufacturing process involves spot and seam welding where the sides are trimmed to control the width and the condition the edges for welding. It is then passed through a number of contoured rollers which cold form the stainless steel into a tube. ERW stands for Electric Resistance Welding.
Production, Supply, Stock Range of Black Steel Tubes

• Size : 15 mm NB to 150 mm NB (1/2” to 6”), 7” (193.7 mm OD to 20” 508 mm OD)
• Dimension & Tolerance : IS: 1239(part 1) 2004, equivalent to BS-1387/1985
• Specifications : IS: 1239(part 1) 2004, equivalent to BS-1387/1985
• Surface Finish : Black
• Length : Max up to 7 m, as per customer’s requirements

Weight :

• Single Tube (light series) : +10 % , -8 % &
• Single Tube (medium & heavy series) : +10 %

Thickness :

• Butt welded light tubes : + not limited, -8 %
• Medium & heavy tubes:  + not limited, -10 %
• Seamless tubes : + not limited, -12.5 %

Testing and Inspection -- Bureau of Indian Standards (BIS) – IS:1239 & IS:3589.
Ends :  beveled or plain ended.
Applications of Black Steel Tubes
Our Black Steel Tubes find their applications in road & parking barriers, agriculture, irrigation, industrial water lines, plant piping, galvanized steel fencings, temporary fencings, road side railings, steel gates & windows, water pipelines, sewerage systems, structural & fabrication work, oil pipe lines, oil refinery piping, crude oil piping.