Stainless Steel Pipes for Heat Exchanger

Product Advantages of stainless steel pipe for heat exchanger:

1. Seamless Weld Processing: Weld seams can be treated to eliminate shadows, ensuring a smooth and uniform surface.

2. High-Precision Mechanical Polishing: Utilizing a fully automated process, the internal Ra value can reach below 0.2μm, providing a flawless and smooth finish that meets various internal requirements.

3. Full Nitrogen Protection Welding: Employing pure hydrogen for annealing protects the welds, resulting in high strength. Tests indicate tensile strength exceeding 690 MPa, with an expansion rate of over 30%.

4. Excellent Machinability: The pipes have undergone testing for ballooning, necking, edge rolling, bending, and flattening without any rupture at the weld seams.

Corrosion Resistance: After 1000 hours of salt spray testing, the surface shows no signs of corrosion.

Materials Available:

304 / 304L / 316 / 316L

Applications:

Dairy and food industries, pharmaceutical industry, and any sector requiring special internal surface specifications.

Process Features:

Internal weld seam leveling, solid solution treatment, and mechanical polishing of the inner surface.

Testing Methods:

Lateral and longitudinal flattening, reverse flattening, hydrostatic testing or eddy current inspection, mechanical property testing, and inner surface roughness testing.

These stainless steel pipes are specifically designed for heat exchangers, ensuring optimal performance, durability, and compliance with stringent industry standards.

STD	O.D		THK	LENGTH
ASTM A270	≦38.1mm±0.13mm		OD<12.7mm ±15%	OD<38.1mm +3.2mm
	≧38.1<88.9mm±0.25mm		OD<12.7mm ±10%	-0mm
ASTM A269	≧88.9<139.8mm±0.38mm			OD≧38.1mm +4.8mm
	≧139.8mm±0.76mm			-0mm
JIS G3447	≦25.4mm ±0.15mm		±10%	-0mm +10mm
	>25.4≦31.8mm ±0.16mm
	>31.8≦38.1mm ±0.19mm
	>38.1≦76.2mm ±0.25mm
	>76.2≦89.1mm +0.30mm
	>89.1≦101.6mm	-0.40mm
		+0.35mm
		-0.40mm
	>101.6≦114.3mm	+0.40mm
	>114.3≦139.8mm	-0.60mm
		+0.40mm
		-0.80mm
	>139.8≦165.2mm	+0.40mm
		-1.20mm