ASTM A192 Cold Drawn Seamless Plain End Boiler Tubes are premium low-carbon steel pressure components engineered specifically for high-pressure environments, widely utilized in the critical heating surfaces of high-pressure boilers, superheaters, and economizers. Manufactured through a seamless cold-drawing process, these tubes offer a significantly smoother surface finish than hot-rolled alternatives and ensure exceptional dimensional precision, with wall thickness tolerances strictly maintained within +20%/-0%.
The material specification limits carbon content to 0.06%–0.18% for superior weldability, providing a minimum tensile strength of 325 MPa and a yield strength of at least 180 MPa. Most importantly, the hardness is strictly capped below 77 HRB (137 HBW) to guarantee excellent ductility for bending and flaring during boiler assembly.
To ensure maximum safety under extreme pressure, every tube within the 1/2" to 7" (12.7–177.8 mm) OD range undergoes 100% hydrostatic testing along with rigorous destructive mechanical tests (flattening and flaring), serving as a foundational material for the long-term stable operation of large-scale industrial power systems.
Safety first! Our ASTM A192 boiler tubes undergo 100% Hydrostatic and NDT testing. Click here to request your full MTC (Mill Test Certificate) and third-party inspection reports!
ASTM A192 CDS Pipe Specification
| Item | Details |
| Standard | ASTM A192 / A192M (ASME SA192) |
| Material | Low Carbon Steel |
| Manufacturing Process | Seamless; Cold Drawn |
| Heat Treatment | Cold-drawn tubes must be annealed/normalized at 1200°F (650°C) or higher. |
| End Finish | Plain End (Standard) or Beveled End (Upon request) |
| Main Applications | High-pressure boilers, Superheaters, Economizers, Heat Exchangers, and Condensers. |
ASTM A192 Chemical Composition & Mechanical Properties
| Category | Element / Property | Value / Requirement |
| Chemical | Carbon (C) | 0.06 - 0.18 % |
| Manganese (Mn) | 0.27 - 0.63 % | |
| Phosphorus (P) | max 0.035 % | |
| Sulfur (S) | max 0.035 % | |
| Silicon (Si) | max 0.25 % | |
| Mechanical | Tensile Strength (min) | 325 MPa (47 ksi) |
| Yield Strength (min) | 180 MPa (26 ksi) | |
| Elongation (min) | 35 % | |
| Hardness | Brinell (max) | 137 HBW |
| Rockwell B (max) | 77 HRB |
ASTM A192 Boiler Tube Size Table
ASTM A192 covers tubes with outside diameters (OD) ranging from 1/2 in. to 7 in. (12.7 mm to 177.8 mm).
| Outside Diameter (OD) | Wall Thickness (WT) | Length |
| 1/2" - 1" (12.7mm - 25.4mm) | 0.085" - 0.200" (2.2mm - 5.0mm) | 5.8m, 6m, 11.8m, 12m or Custom |
| 1-1/4" - 2" (31.8mm - 50.8mm) | 0.095" - 0.250" (2.4mm - 6.3mm) | 5.8m, 6m, 11.8m, 12m or Custom |
| 2-1/2" - 4" (63.5mm - 101.6mm) | 0.105" - 0.500" (2.7mm - 12.7mm) | 5.8m, 6m, 11.8m, 12m or Custom |
| 5" - 7" (127mm - 177.8mm) | 0.125" - 1.000" (3.2mm - 25.4mm) | 5.8m, 6m, 11.8m, 12m or Custom |
ASTM A192 Seamless Pipe Tolerances (Per ASTM A450)
| Category | Tolerance Range |
| Outside Diameter (OD) | ± 0.4% or minimum ± 0.15mm (varies by diameter) |
| Wall Thickness (WT) | +20% / -0% (Typical for boiler tubes; no negative tolerance allowed) |
| Length | + 3.0mm / - 0mm (Cold cut length) |
ASTM A192 Equivalent Materials (Cross-Reference)
| USA (ASTM/ASME) | China (GB) | Germany (DIN) | Japan (JIS) | European (EN) |
| ASTM A192 | GB 20G / GB 5310 | DIN 17175 (St35.8) | JIS G3461 (STB 340) | EN 10216-2 (P235GH) |
Test Requirements
To ensure the integrity of tubes in high-pressure steam environments, the following tests are mandatory:
Flattening Test: Ensures no cracks occur when the tube is deformed under pressure.
Flaring Test: Checks the ductility for expanding and joining operations.
Hardness Test: Ensures hardness does not exceed limits to allow for easy bending and fabrication.
Hydrostatic Test: 100% of tubes must undergo water pressure testing to ensure no leaks.
NDT (Non-Destructive Test): Eddy Current or Ultrasonic testing may be used as an alternative to the hydrostatic test.
GNEE A192 Boiler Tube Certificate
FAQ
What is a cold drawn seamless tube?
Cold Drawn Seamless (CDS) tube is a precision-engineered steel pipe produced by pulling a solid "mother tube" through a die and over a mandrel at room temperature.
Unlike welded pipes, it is made from a single solid piece of steel, resulting in a continuous structure with no seams or joints. The cold-drawing process provides four key advantages:
Superior Surface Finish: It has a much smoother and cleaner interior and exterior surface than hot-rolled tubes.
Extremely Tight Tolerances: It offers precise dimensions (wall thickness and diameter), making it ideal for high-accuracy engineering.
Increased Strength: The process of "cold working" naturally hardens the steel, enhancing its mechanical strength and durability.
Pressure Reliability: Because there is no weld (the weakest point of a pipe), it is the safest choice for high-pressure applications like boilers and hydraulic systems.
What type of tubing is used in boiler tubes?
Boiler tubes are almost exclusively seamless steel tubes, as they must withstand extreme internal pressure and high temperatures without the risk of weld failure. The specific material used depends on the heat and pressure requirements of the boiler:
Carbon Steel (e.g., ASTM A192, A210): The most common type for standard high-pressure boilers. It is cost-effective and provides excellent strength for general steam generation.
Alloy Steel (e.g., ASTM A213 T11, T22): Used in "superheaters" and "reheaters" where temperatures are significantly higher. The addition of Chromium and Molybdenum increases resistance to heat, scaling, and "creep" (deformation over time).
Stainless Steel (e.g., ASTM A213 TP304, 316): Reserved for extreme environments where high-temperature corrosion or oxidation is a major concern.
How long should boiler tubes last?
Under ideal operating and maintenance conditions, high-quality boiler tubes are typically designed to last 20 to 30 years.
However, the actual lifespan depends heavily on four critical factors:
Water Chemistry: This is the #1 factor. If the water is not properly treated, scale buildup and internal oxygen corrosion can cause tubes to fail in as little as 2 to 5 years.
Operating Intensity: Boilers that are constantly started and stopped (thermal cycling) experience more stress and fatigue than those running at a steady state.
Fuel Quality: Corrosive fuels or those with high ash content can cause external erosion and "wall thinning" over time.
Regular Maintenance: Periodic cleaning and soot-blowing prevent hotspots and ash buildup, which significantly extends tube life.
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