- Carbon & Carbon Alloy Steel
- Stainless Steel
- Copper & Nickel Alloy
- Heat Efficiency Tubes
- Pipe Fittings
- Pipe Flanges
- Gasket, Stud Bolt &Nut
- Industrial Valves
Seamless Carbon Steel Boiler Tubes for High Pressure - China Suppliers & Factory ASTM A192/A192M
Ordering Information
Purchasers must specify the following when ordering:
- Quantity — total length or number of tubes
- Material — seamless carbon steel boiler tube
- Dimensions — nominal outside diameter and minimum wall thickness, in inches [A192] or millimeters [A192M]
- Length — cut lengths with tolerances or random lengths
- ASTM Designation — A192 for inch-pound units, A192M for metric
- Testing Requirements — hydro-static test, nondestructive electric test, or expanded flattening test
- Certification — if mill test reports are required
- Additional Requirements — special marking, heat treatment, or supplementary testing
Material & Manufacture
Steel Making Process: Open hearth, electric furnace, or basic oxygen process.
Manufacturing Method: Tubes are hot-finished or cold-drawn, then stress relieved or annealed to ensure ductility and strength.
Heat Treatment: Mandatory to meet mechanical property requirements.
Chemical Composition (%)
| Element | Requirement |
|---|---|
| Carbon (C) | 0.06 – 0.18 |
| Manganese (Mn) | 0.27 – 0.63 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Silicon (Si) | ≥ 0.10 (for deoxidation) |
Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile Strength | ≥ 325 MPa (47,000 psi) |
| Yield Strength | ≥ 180 MPa (26,000 psi) |
| Elongation (in 2 in./50 mm) | ≥ 35% |
| Hardness (optional) | ≤ 72 HRB (Rockwell B) |
Test Requirements
🔬 Mandatory Tests
Hydro-static Test: Each tube must withstand a specified water pressure (≥ 70 bar / 1,000 psi for 5 sec) without leakage.
Nondestructive Electric Test (NDE): If hydro-static testing is waived, eddy current or ultrasonic testing must be performed.
Optional / Special Tests
Flattening Test: A sample must flatten to a specified distance without cracking.
Flaring Test: A cone expansion test to verify ductility (if required).
Hardness Test: Optional, per agreement.
Dimensions & Tolerances
- Outside Diameter: Permissible variations (±0.8% for cold-drawn, ±1.0% for hot-finished).
- Wall Thickness: Must meet minimum requirements with tolerances (±10% for most sizes).
-
Length:
- Cut lengths: ±3.2 mm (1/8 in.) for lengths ≤ 7.3 m (24 ft).
- Random lengths: 4.9 – 12.2 m (16 – 40 ft).
Inspection & Certification
Inspection: Manufacturer performs tests; purchaser may witness or request third-party inspection.
Certification: Mill test reports (chemical analysis, mechanical properties, and test results) provided upon request.
Marking Requirements
Each tube must be marked with:
- ASTM standard (A192 / A192M)
- Manufacturer's name or trademark
- Nominal size (OD and wall thickness)
- Heat number or traceability code
Keywords
⚖️ Key Differences from ASTM A179 / A179M
| Feature | A192 / A192M | A179 / A179M |
|---|---|---|
| Application | High-pressure boilers | Heat exchangers / condensers |
| Wall Thickness Control | Stricter (high-pressure demands) | Standard |
| Heat Treatment | Mandatory | May be supplied as-drawn |
This standard ensures safety and performance in critical high temperature, high pressure applications.
Want to order the same? Contact us Now to send your request!
