U-shaped seamless steel tubes
U-shaped seamless steel tubes, bellows, retractable tubes and spiral tubes for heat exchanger bundle
Uses: for heat exchangers, heat exchangers, evaporator pipes, etc., used in petrochemical industry.
Common Specification and Parameter Table of U-Shaped Seamless Steel Pipes
This table is applicable for the selection of U-shaped seamless steel pipes in machinery, automotive, chemical and other fields, covering two mainstream forming processes (cold bending and hot bending). The parameters can be directly used in product manuals, selection guides and technical bids.
Forming Process | Material Category | Common Material Grades | Caliber Range(Outer Diameter D) | Wall Thickness Range(t) | Minimum Bending Radius(R) | Core Performance Indicators | Applicable Working Conditions | Executive Standards |
Cold Bending | Carbon Structural Steel | 20#, 45# | φ6mm - φ108mm | 0.8mm - 6mm | 1.5D - 3D | Tensile Strength ≥410MPaWall Thickness Reduction Rate ≤12.5%Surface Roughness Ra ≤1.6μm | Automotive brake pipes, coolant circulation pipesPrecision hydraulic system branch pipesSmall mechanical connecting rods | GB/T 12459-2017 QC/T 29106-2014 |
Stainless Steel | 304, 316, 316L | φ6mm - φ159mm | 1.0mm - 8mm | 1.5D - 4D | No rust after 480h neutral salt spray testTensile Strength ≥520MPaAngle Tolerance ±0.5° | Automotive exhaust system elbow sectionsChemical corrosive medium conveying pipesAir conditioning refrigerant pipes | GB/T 12459-2017 GB/T 14976-2012 | |
Alloy Structural Steel | 20Cr, 40Cr | φ10mm - φ89mm | 1.5mm - 6mm | 2D - 3.5D | Hardness after quenching and tempering: HRC25-35Impact Toughness Ak ≥30J (room temperature) | Precision mechanical transmission connecting rodsAutomotive steering system pipe fittings | GB/T 12459-2017 GB/T 8162-2018 | |
Hot Bending | Low Alloy High Strength Steel | Q345B/C, 16Mn | φ114mm - φ630mm | 6mm - 40mm | 3D - 6D | Tensile Strength ≥510MPaWall Thickness Reduction Rate ≤10%Water pressure test pressure: 1.5 times the working pressure | Large construction machinery hydraulic main pipesBoiler water wall pipesSteel structure support elbows | GB/T 12459-2017 GB/T 8163-2018 |
High Temperature Resistant Alloy Steel | 20CrMo, 42CrMo | φ89mm - φ325mm | 5mm - 25mm | 3D - 5D | High temperature resistance ≤650℃Tensile Strength ≥785MPaNo cracks or wrinkles | Heavy-duty vehicle engine exhaust manifoldsPressure vessel coilsHigh-temperature fluid conveying pipes | GB/T 12459-2017 GB/T 150.2-2024 |
Comprehensive score