IS 2062 E350C Pipes and Tubes
For Indian infrastructure and industrial projects that demand both high structural strength and certified low-temperature toughness from hollow sections, IS 2062 E350C is the domestically standardized answer. Governed by the Bureau of Indian Standards under IS 2062:2011, the E350C designation confirms a minimum yield strength of 350 MPa alongside mandatory Charpy V-notch impact testing at −20 °C — the combination that defines India’s highest-toughness sub-grade within the E350 strength level.
In pipe and tube form, E350C hollow sections serve crane structures, railway bridges, industrial plant frameworks, and heavy fabrication projects across India where the project specification demands impact-tested structural tubulars without the procurement complexity of imported European grades. As the Indian structural equivalent of S355J2, E350C pipes deliver equivalent engineering performance under BIS certification.
Mechanical Properties
| Property | Value | Unit |
|---|---|---|
| Tensile Strength (min.) | 490 | MPa |
| Yield Strength (min., ≤ 20 mm) | 350 | MPa |
| Yield Strength (min., 20–40 mm) | 330 | MPa |
| Yield Strength (min., > 40 mm) | 320 | MPa |
| Elongation (min.) | 22 | % |
| Charpy Impact at −20 °C (min.) | 27 | J |
| Brinell Hardness (max.) | 229 | HB |
| Density | 7.85 | g/cm³ |
| Modulus of Elasticity | 210 | GPa |
Chemical Composition
| Element | Max. Content (%) |
|---|---|
| Carbon (C) | 0.20 |
| Manganese (Mn) | 1.50 |
| Silicon (Si) | 0.45 |
| Sulfur (S) | 0.040 |
| Phosphorus (P) | 0.040 |
| Carbon Equivalent (CE) | 0.42 max |
The CE limit of 0.42 places E350C firmly in the good weldability range, enabling standard arc welding without mandatory preheating for most wall thicknesses.
E350 Quality Level Comparison
| Quality | Impact Test Temp. | Charpy Energy | Typical Use |
|---|---|---|---|
| E350A | Not required | — | General structural, ambient conditions |
| E350B | 0 °C | 27 J min. | Moderate structural, mild cold conditions |
| E350C | −20 °C | 27 J min. | Cranes, cold-climate & dynamic structures |
E350C pipes and tubes are the correct specification when the project requires impact-tested hollow sections at −20 °C — the property that distinguishes them from E350A and E350B tubulars.
Product Types & Manufacturing Routes
- Seamless Pipes (IS 1239 / IS 3589): Hot-pierced and rolled without a weld seam, providing uniform wall thickness and superior pressure and fatigue performance. The preferred form for crane columns, hydraulic structural applications, and high-stress tubular members.
- ERW / Welded Pipes (IS 1239 / IS 3589): Electric resistance welded pipes produced from E350C strip for structural columns, frames, and general hollow section applications where seamless is not mandated.
- Structural Hollow Sections — SHS / RHS / CHS (IS 4923): Square, rectangular, and circular hollow sections cold-formed or hot-formed from E350C material. The standard product form for building columns, truss members, crane girder frames, and industrial structural applications across Indian projects.
Applications
- Crane & Material Handling Structures: Hollow section columns, boom tubes, and lattice boom chords for overhead cranes, goliath cranes, and jib cranes governed by IS 807 and IS 3177, where −20 °C impact-tested tubulars are required.
- Railway Bridge Structural Members: Tubular chord and brace members, cross-frame tubes, and portal frame components in railway and road-over-rail bridges designed to Indian Railways bridge codes.
- Industrial Plant Frameworks: Primary structural columns and rafters in steel plant buildings, power station structures, and refinery pipe racks in northern India where winter temperatures require guaranteed toughness.
- Pressure Vessel Support Structures: Structural pipe columns, skirt supports, and tubular saddle frames attached to pressure vessels in refineries and chemical plants, where IS 2825 vessel codes require impact-tested structural attachments.
- Piling & Foundation Tubulars: Large-diameter E350C pipes used as driven steel piles and open-section caissons in bridge and industrial foundation engineering across Indian infrastructure projects.
- Mining & Heavy Industry Frames: Structural hollow section frames for crusher housings, conveyor gantries, and equipment skids operating in cold-climate mining regions of India.
Weldability & Processing
E350C pipes and tubes weld consistently with standard arc welding processes — SMAW, GMAW, FCAW, and SAW — using matching or over-matching electrodes. The CE limit of 0.42 ensures no preheating is required for wall thicknesses below 25 mm at ambient temperatures above 5 °C. For walls above 25 mm or in cold site conditions, a preheat of 100–150 °C is recommended.
For applications where the full joint must meet −20 °C toughness requirements, welding consumables must carry a specified impact classification at −20 °C. Using standard electrodes without an impact designation defeats the purpose of specifying E350C over E350A.
Dimensional Range
| Product Form | Size Range | Wall Thickness |
|---|---|---|
| Seamless Pipe (IS 3589) | 26.9 mm – 610 mm OD | 3.2 mm – 50 mm |
| ERW Pipe (IS 1239 / IS 3589) | 15 mm – 600 mm NB | 2.0 mm – 20 mm |
| CHS (IS 4923) | 26.9 mm – 457 mm OD | 2.6 mm – 25 mm |
| SHS (IS 4923) | 20 × 20 mm – 300 × 300 mm | 2.0 mm – 16 mm |
| RHS (IS 4923) | 50 × 25 mm – 400 × 200 mm | 2.0 mm – 16 mm |
Manufacturing Standards & Equivalents
- IS 2062:2011: Hot Rolled Medium and High Tensile Structural Steel (BIS)
- IS 1239: Steel Tubes, Tubulars and Other Wrought Steel Fittings
- IS 3589: Steel Pipes for Water and Sewage (structural grades)
- IS 4923: Hollow Steel Sections for Structural Use
Quality Assurance
- Mechanical Testing: Mechanical Testing — Tensile and yield strength testing per IS 1608 and elongation verification are performed on every heat. Charpy V-notch impact testing at −20 °C per IS 1757 is mandatory for E350C and is the primary distinguishing test from lower quality sub-grades. Results are heat-traceable and documented per BIS requirements.
- Dimensional Accuracy: Dimensional Accuracy — Outer diameter, wall thickness, length, ovality, and straightness are verified against IS 1239, IS 3589, or IS 4923 tolerances as applicable. Wall thickness uniformity is specifically checked on seamless pipe to confirm consistent properties around the pipe circumference.
- Weldability Tests: Weldability Tests — Carbon equivalent is verified on each heat to confirm CE ≤ 0.42. Weld procedure qualifications are conducted per IS 7307, including Charpy impact testing of weld and HAZ samples at −20 °C to confirm the full welded joint meets E350C toughness requirements.
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