Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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1. Material Standard & Scope
Standard: ASTM A210/A210M (ASME SA210 equivalent).
Scope: Seamless tubes for fired boilers, superheaters, and heat exchangers operating at moderate to high temperatures (up to ~450°C / 842°F).
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | - | 0.27 |
| Manganese (Mn) | - | 0.93 |
| Phosphorus (P) | - | 0.035 |
| Sulfur (S) | - | 0.035 |
| Silicon (Si) | 0.10 | 0.20 |
| Residuals | Cu ≤ 0.40%, Ni ≤ 0.40%, Cr ≤ 0.40%, Mo ≤ 0.15% |
| Property | Value (Metric) | Value (Imperial) |
|---|---|---|
| Tensile Strength | ≥415 MPa | ≥60,200 psi |
| Yield Strength | ≥255 MPa | ≥37,000 psi |
| Elongation | ≥30% (50mm gauge) | ≥30% (2" gauge) |
| Hardness | ≤143 HBW | ≤143 Brinell |
Outside Diameter (OD): 12.7 mm (0.5") to 114.3 mm (4.5") (standard). Custom sizes up to 127 mm (5") available.
Wall Thickness: 1.65 mm (0.065") to 12.7 mm (0.5"), per ASME B36.10M.
Length: Random (6-12m) or fixed lengths; ends plain, beveled, or threaded.
Tolerances:
OD: ±0.8% (hot-finished), ±0.5% (cold-drawn).
Wall Thickness: +20%/-0% (ASME B36.10M).
Power Generation: Water walls, risers, and downcomers in coal-fired boilers.
Heat Exchangers: Shell-and-tube configurations for steam/water systems.
Industrial Heating: Convection banks in process heaters.
Retrofits: Replacement tubes for aging infrastructure.
Mandatory Tests:
Hydrostatic Test: Pressurized to 70 bar (1,015 psi) or per customer specs.
NDT: Ultrasonic (UT) or eddy current (ET) testing for defects.
Flattening Test: For cold-drawn tubes to check ductility.
Certification: Mill Test Certificate (EN 10204/3.1 or 3.2) with heat analysis and mechanical test results.
