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IS 1239:2004 Part 2 is the Indian Standard (BIS) for mild steel tubes, tubulars and other wrought steel fittings - part 2: mild steel tubulars and other wrought steel pipe fittings. This standard specifies the requirements for mild steel tubulars and wrought steel pipe fittings used for conveying water, non-hazardous gas, air, and steam. It covers dimensions, threading, galvanizing, and testing procedures for plumbing components like elbows, tees, sockets, and crosses.
Specifies requirements for mild steel tubulars and wrought steel pipe fittings suitable for use with pipes covered in IS 1239 (Part 1).
Non-alloy steel tubes suitable for welding and threading - Technical delivery conditions
Covers non-alloy steel tubes for water, gas, and other fluids; very similar application scope.
ASTM A53/A53M-22ASTM (US)
MediumCurrent
Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
Covers general-purpose steel pipe for mechanical and pressure applications, including conveying fluids.
JIS G 3452:2019JISC (Japan)
MediumCurrent
Carbon Steel Pipes for Ordinary Piping
Specifies carbon steel pipes for low-pressure steam, water, oil, gas, and air piping.
BS 1387:1985BSI (UK)
HighWithdrawn
Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads
Historically, this was the direct basis for IS 1239, covering the same 'Light', 'Medium', 'Heavy' classes.
Key Differences
≠IS 1239 classifies pipe wall thickness into 'Light', 'Medium', and 'Heavy' series based on nominal bore. In contrast, ASTM A53 uses a 'Schedule' system (e.g., Sch 40, Sch 80), which defines wall thickness for a given nominal pipe size (NPS).
≠Pipe threads specified in IS 1239 conform to IS 554 (based on British Standard Pipe thread - BSP). American standards like ASTM A53 specify NPT (National Pipe Taper) threads as per ASME B1.20.1. These thread types are not interchangeable.
≠IS 1239 specifies steel grades primarily by yield strength (e.g., YSt 210, YSt 240). ASTM A53 uses Grades (e.g., Grade A, Grade B) with different chemical composition and strength requirements. EN 10255 uses a steel designation like S195T.
≠While all standards specify hot-dip galvanizing, the minimum required zinc coating mass can differ. For instance, ASTM standards often require a slightly heavier coating weight compared to the minimums specified via IS 1239's reference to IS 4736.
Key Similarities
≈The primary scope of all standards is to provide specifications for low-carbon (mild) steel tubes for general-purpose conveyance of fluids like water, air, non-hazardous gas, and low-pressure steam.
≈All standards cover both seamless and welded (typically Electric Resistance Welded - ERW) manufacturing processes for the tubes.
≈The standards provide options for similar finishes, principally 'black' (uncoated or with a temporary protective varnish) and hot-dip galvanized (zinc-coated).
≈All mandate a core set of mechanical and quality tests, including tensile tests, flattening/bend tests, and a hydrostatic pressure test to ensure pipe integrity and material properties.
Parameter Comparison
Parameter
IS Value
International
Source
Material Grade (Typical)
YSt 240
S195T
BS EN 10255
Minimum Tensile Strength (for typical grade)
320 MPa (for YSt 240)
320 - 520 MPa (for S195T)
BS EN 10255
Thickness Designation System
Light, Medium, Heavy classes
Schedules (e.g., Sch 40, Sch 80)
ASTM A53/A53M
Wall Thickness (50mm NB 'Medium' vs Sch 40)
3.65 mm (for 50mm Medium)
3.91 mm (for 2" NPS Sch 40)
ASTM A53/A53M
Pipe Thread Standard
IS 554 (BSP based)
ASME B1.20.1 (NPT)
ASTM A53/A53M
Hydrostatic Test Pressure
5.0 MPa (for all sizes)
50 bar / 5.0 MPa (for all sizes)
BS EN 10255
Max Carbon Content (for comparable welded grade)
0.20%
0.25% (for Grade A)
ASTM A53/A53M
⚠ Verify details from original standards before use