ASTM A213 T91
ASTM A213 T91 - seamless steel tube
Seamless steel pipes are manufactured by heating solid steel billets, piercing them into hollow shells and processing them through rolling, sizing and heat treatment to produce high-strength pipes without welded seams for demanding industrial services.
The mandrel mill process is a high-precision seamless pipe manufacturing route primarily used for small to medium diameters (25–150 mm / 1–6"). It delivers excellent dimensional accuracy, surface quality and mechanical properties.
Seamless pipes are manufactured from solid steel billets that are heated, pierced, and rolled into hollow tubes without any welded seams, resulting in uniform strength and high pressure resistance.
Mandrel mill process flow
A round steel billet is heated to approximately 1,300°C (2,370°F) in a rotary hearth furnace and pierced by a rotary piercer to form a hollow shell. The shell is then passed through a mandrel mill, where a series of paired rolls—set at 90° to each other— continuously reduce both the outside diameter and wall thickness, forming a multiple-length mother tube.
The mother tube is reheated and further reduced to the finished dimensions by a multi-stand stretch-reducing mill. After sizing, the pipe is cooled, cut to length, straightened, and subjected to final inspection and hydrostatic testing prior to shipment.
Seamless pipes are high-strength, hollow steel tubes produced without welding, widely used in high-pressure and industrial applications.
Seamless tube manufacturing process
Seamless steel pipes are inherently resistant to corrosion and suitable for high-pressure, high-temperature service. However, in aggressive environments, proper surface protection and storage are essential to maximize service life.
Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.
Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.
Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.
The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.
Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.
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