20G Non-Alloy Seamless Steel Omega Tube for High-Pressure Boiler Service with Cold-Drawn Process

20G non-alloy seamless omega tube is a cold-drawn special-profile boiler tube developed for high-temperature pressure service where dimensional stability, heat-transfer efficiency, and shape consistency are critical. The base material is 20G under GB/T 5310, a recognized boiler-tube steel used for high-pressure boiler and other elevated-temperature pressure equipment.

• Boiler-grade chemistry: 20G under GB/T 5310 is specified at C 0.17-0.23%, Si 0.17-0.37%, Mn 0.35-0.65%, P ≤0.025%, S ≤0.015%, designed for pressure service at elevated temperature.
• Reliable strength level: In normalized condition, 20G requires tensile strength 410-550 MPa, yield strength at least 245 MPa, elongation at least 24%.
• Cold-drawn seamless route: Improves profile precision, geometry control, cleaner surface, and more repeatable section dimensions.
• Heat-transfer optimization: Omega tubes improve heat-transfer layout efficiency in compact boiler assemblies.

• Grade selection matched to boiler duty: We specify 20G to GB/T 5310 for high-pressure boiler tubes and high-temperature pressurized equipment.
• Comprehensive inspection package: Addresses pressure integrity, hidden defects, and forming damage with flattening, flaring, hardness, hydrostatic testing, and nondestructive tests.
• Functional heat treatment and surface control: Normalized delivery condition, controlled heat treatment, and clean post-drawing surface quality ensure elevated-temperature performance and service life.

Power-station boiler heat-exchange coil using omega-profile water-wall / superheater tube modules. The omega section helps optimize compact heat-transfer layout while retaining seamless pressure-bearing tube integrity.