Alloy Steel Pipes is a broad spectrum of steel pipes that are manufactured from raw materials that are alloys of various elements. The steel is alloyed with other elements ranging from 1% to 50% by weight and the mechanical properties and applications vary according to the alloyed elements and the percentages.

Alloy Steel Pipes
Alloy Steel Seamless Pipes welded alloy steel pipess

Hi-tech Metal & Tubes is one of the leading Alloy Steel Pipes Manufacturers In India and we produce a range of AS pipes. The applications of these pipes range widely. The AS Seamless Pipes is produced through processes that cause the wall to be seamless or to have less absolute roughness. These pipes could be used in complex systems with precision measurement requirements. Our welded alloy steel pipes can be used in applications with excessive welding requirements. Depending on the application requirements, the alloys properties differ and the composition differs as well. The High Strength Low AS Pipes can have different elements such as manganese, nickel, silicon, titanium, chromium, aluminum or copper in the composition. Sometimes the Seamless Ferritic As Pipes materials have a mixture of these elements in the alloys. There are special pipes such as the AS Drill Pipes and others. The applications include automotive parts, structural components, chemical application, power generation applications, marine and sea water application, aerospace applications and domestic applications as well. Please contact us for further information and pricing.


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Alloy Steel pipes ASTM A335 P11, P22, and P91 pipes are utilized in the power generation, and in downstream oil and gas, P5 and P9 grades are for refinery applications.


AS Pipe Standard Specification

Specifications of AS Seamless Pipes ASTM A 335 ASME SA 335
welded AS pipes Dimensions ASTM, ASME and API
AS Drill Pipes Size 1/8 Inch NB TO 30 Inch NB
AS Pipes Schedule SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
High Strength Low AS Pipe Length 13500 MM
Type of Seamless Ferritic AS Pipe Seamless / Fabricated
End Plain End, Beveled End, Treaded

Size Chart of welded AS pipes

NB Size OD 40S 5S 10S S10 S20 S40 S60 XS/80S S80 S100 S120 S140 S160 XXS
1/8" 10.29 1.2 1.73 2.41
1/4" 13.72 1.7 2.24 3.02
3/8" 17.15 1.7 2.31 3.2
15 1/2" 21.34 2.8 1.7 2.1 2.77 3.73 3.73 4.78 7.47
20 3/4" 26.67 2.9 1.7 2.1 2.87 3.91 3.91 5.56 7.82
25 1" 33.4 3.4 1.7 2.8 3.38 4.55 4.55 6.35 9.09
32 1 1/4" 42.16 3.6 1.7 2.8 3.56 4.85 4.85 6.35 9.7
40 1 1/2" 48.26 3.7 1.7 2.8 3.68 5.08 5.08 7.14 10.2
50 2" 60.33 3.9 1.7 2.8 3.91 5.54 5.54 9.74 11.1
65 2 1/2" 73.03 5.2 2.1 3.1 5.16 7.01 7.01 9.53 14
80 3" 88.9 5.5 2.1 3.1 5.49 7.62 7.62 11.1 15.2
90 3 1/2" 101.6 5.7 2.1 3.1 5.74 8.08 8.08
100 4" 114.3 6 2.1 3.1 6.02 8.56 8.56 11.1 13.5 17.1
125 5" 141.3 6.6 2.8 3.4 6.55 9.53 9.53 12.7 15.9 19.1
150 6" 168.3 7.1 2.8 3.4 7.11 10.97 11 14.3 18.3 22
200 8" 219.1 8.2 2.8 3.8 6.4 8.18 10.3 12.7 12.7 15.1 19.3 20.6 23 22.2
250 10" 273.1 9.3 3.4 4.2 6.4 9.27 12.7 12.7 15.1 19.3 21.4 25.4 28.6 25.4
300 12" 323.9 9.5 4 4.6 6.4 10.3 14.3 12.7 17.5 21.4 25.4 28.6 33.3 25.4
350 14" 355.6 9.5 4 4.8 6.4 7.9 11.1 15.1 12.7 19.1 23.8 27.8 31.8 35.7
400 16" 406.4 9.5 4.2 4.8 6.4 7.9 12.7 16.7 12.7 21.4 26.2 31 36.5 40.5
450 18" 457.2 9.5 4.2 4.8 6.4 7.9 14.3 19.1 12.7 23.8 29.4 34.9 39.7 45.2
500 20" 508 9.5 4.8 5.5 6.4 9.5 15.1 20.6 12.7 26.2 32.5 38.1 44.5 50
550 22" 558.8 9.5 4.8 5.5 6.4 9.5 22.2 12.7 28.6 34.9 41.3 47.6 54
600 24" 609.6 9.5 5.5 6.4 6.4 9.5 17.5 24.6 12.7 31 38.9 46 52.4 59.5
650 26" 660.4 9.5 7.9 13 12.7
700 28" 711.2 9.5 7.9 13 12.7
750 30" 762 9.5 6.4 7.9 7.9 13 12.7
800 32" 812.8 9.5 7.9 13 17.5 12.7
850 34" 863.6 9.5 7.9 13 17.5 12.7
900 36" 914.4 9.5 7.9 13 19.1 12.7

AS Seamless Pipe Available Grades