YUHONG GROUP is a manufacturer and exporter specializing in seamless and welded steel pipes, tubes, and heat exchanger components, with over 35 years of industrial manufacturing experience. The annual output and sales volume exceed 80,000 metric tons, serving engineering, procurement, and construction (EPC) contractors, original equipment manufacturers (OEM), and stockists across more than 85 countries, including the United States, Germany, Italy, the United Kingdom, Canada, Saudi Arabia, France, Poland, Singapore, and South Korea. Our core manufacturing capabilities cover custom u tube bundle fabrication, finned tube bundle production, precision-machined heat exchanger tubesheet integrations, and complete tube bundle units for high-pressure shell and tube heat exchanger and shell & tube heat exchanger systems.
ASTM A192 / ASME SA192 covers minimum-wall-thickness, seamless carbon steel boiler and superheater tubes engineered for high-pressure service, shell and tube heat exchanger units, and custom u tube bundle configurations. Manufactured through hot-finished or cold-drawn seamless processes, cold-finished tubes undergo mandatory thermal processing at 1200°F (650°C) or higher to achieve optimum ductility and strength for finned tube bundle fabrication and heat exchanger tubesheet expansion.
ASME SA192 / SA192M: Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service.
ASTM A192 / A192M: Standard Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service.
ASME SA450 / SA450M: Specification for General Requirements for Carbon and Low Alloy Steel Tubes.
TEMA RCB: Standards of the Tubular Exchanger Manufacturers Association for tube bundle and heat exchanger tubesheet design.
Carbon (C): 0.06% – 0.18%
Manganese (Mn): 0.27% – 0.63%
Silicon (Si): 0.25% max.
Phosphorus (P): 0.035% max.
Sulfur (S): 0.035% max.
Mechanical Properies of ASTM A192
| Grade | Tensile Str(Mpa) | Yield Str(Mpa) | Elongation(%) | Hardness | |
| Rockwell (HRB) | Brinell(HB) | ||||
| A192 | ≥180 | ≥325 | ≥35 | ≤77 | ≤137 |
Thickness Tolerance of ASTM A192
| Seamless, Cold-Finished Tubes | Type | Wall Thickness Tolerance | |
| OD Range | Under(-) | Over(+) | |
| 0~38.1mm (Incl.) | SMLS | 0 | 20% |
| 38.1mm~177.8mm (Incl.) | SMLS | 0 | 22% |
ASTM A192 / ASME SA192: Optimized low-carbon seamless steel specification for shell & tube heat exchanger tubes and boiler heating surfaces.
ASTM A210 Grade A1 / ASME SA210 Gr.A1: Medium-carbon seamless steel specification with higher minimum tensile (415 MPa) and yield (255 MPa) strength.
ASTM A106 Grade B / ASME SA106 Gr.B: Seamless carbon steel pipe standard specified for pressure piping systems rather than thin-wall tube bundle applications.
Hydrostatic Test: 100% executed on all finished tubes per ASME SA450 prior to assembly into any shell and tube heat exchanger or tube bundle.
Nondestructive Electric Examination: 100% Eddy Current Testing (ECT) or Ultrasonic Testing (UT) per ASTM E213 / ASTM E426 to detect longitudinal flaws.
Mechanical & Metallurgical Testing: Flattening, flaring, hardness, and tensile testing performed per heat lot in accordance with ASTM A370.
Shell and Tube Heat Exchanger & Shell & Tube Heat Exchanger: High-pressure shell and tube heat exchanger bundles, condensers, and evaporators.
Tube Bundle & U Tube Bundle Components: U-bent tube assemblies, straight tube bundles, and replacement tube bundles for industrial coolers.
Finned Tube Bundle Fabrication: Base tubing for extruded, G-fin, L-fin, and welded finned tube bundle configurations.
Heat Exchanger Tubesheet Systems: High-pressure boilers, economizers, water wall panels, and heat exchanger tubesheet integrations.
Surface Conditioning: Black varnished, anti-rust oiled, passivated, or phosphated.
End Configuration: Plain ends or beveled ends prepared for heat exchanger tubesheet welding or expanding.
Protection & Packing: Fitted with soft plastic end caps; bundled with steel strapping or packed in seaworthy pre-fumigated wooden cases or iron frames for transport-worthy delivery.
