Polished Welded Stainless Steel Tubing with Bright Annealed Surface for Corrosion Resistant Fluid Transfer
Price:
USD 2000-3000 per Ton
MOQ:
1 Ton
Delivery Time:
4-8 Weeks
Brand:
TORICH
Product Description
Polished Welded Stainless Steel Tubing Bright Annealing Surface For Petroleum And Foodstuff
Product Overview
This polished welded stainless steel tubing is designed for clean fluid transfer lines where corrosion resistance, smooth surface finish, weld integrity, and dimensional consistency are critical. For foodstuff and hygienic service, ASTM A270 is the preferred reference because it covers seamless, welded, and heavily cold-worked welded stainless sanitary tubing with special surface finish requirements for dairy and food applications. For general corrosion-resistant tubing, ASTM A269 may also be specified, while ASTM A312 or EN 10217-7 can be used when pressure piping requirements apply.
Specifications
| Item | Typical Supply Range |
|---|---|
| Material | Austenitic stainless steel |
| Standard | ASTM A270, ASTM A269, ASTM A312, EN 10217-7, JIS G3447 / G3459, GB/T 12771 / GB/T 13296 |
| Grades | 304, 304L, 316, 316L, 321; 201 / 202 available for non-hygienic decorative or structural use |
| Outside Diameter | 6 mm-304.8 mm for ASTM A270 sanitary tubing; larger sizes available for industrial welded pipe |
| Wall Thickness | 0.5-8.0 mm typical; 1.24-3.81 mm common for sanitary tubing |
| Length | 1-12 m, customized; common lengths: 4000 mm, 5800 mm, 6000 mm, 12000 mm |
| Tolerance Range | OD tolerance according to ordered standard; wall thickness tolerance commonly ±10% or max. 12.5% depending on specification |
| Straightness | ≤1.5 mm/m typical for precision welded tubing |
| Surface Condition | Bright annealed, pickled, polished, mirror polished; ID/OD polishing available |
| Heat Treatment | Solution annealed or inline hydrogen bright annealed; rapid quenching after annealing |
Main Characteristics
| Characteristic | Technical Description |
|---|---|
| Surface roughness control | Sanitary polished tubing can be supplied with ID Ra ≤0.8 μm; mechanically polished A270 tubing may reach ID Ra ≤0.5 μm when specified. |
| Bright annealed finish | Hydrogen bright annealing at approximately 1040°C minimum followed by rapid quenching helps restore corrosion resistance and maintain a clean, bright surface. |
| Corrosion resistance | 304 / 304L provides general food and water corrosion resistance; 316 / 316L adds 2.00-3.00% Mo for improved chloride and cleaning-chemical resistance. |
| Welded tube consistency | Welded tubing provides stable OD, wall thickness, and polished appearance for fluid transfer lines, frames, and hygienic assemblies. |
| Low-carbon grades | 304L and 316L reduce sensitization risk after welding because carbon is limited to 0.035% max under ASTM tubing specifications. |
Our Advantages
| Buyer Concern | Practical Solution |
|---|---|
| "Will the inner surface be clean enough for food or dairy lines?" | We define surface roughness at quotation stage, such as ID Ra ≤0.8 μm or ID Ra ≤0.5 μm, instead of only saying "polished". Surface inspection and roughness reports can be supplied when required. |
| "Can the welded seam resist leakage and deformation during installation?" | Tubes can be supplied with eddy-current testing, hydrostatic testing, flattening testing, and visual weld inspection according to the selected standard. ASTM A269 includes mechanical test requirements such as flaring, flange, hardness, and reverse flattening tests. |
| "How do I choose between 304L and 316L?" | For neutral food fluids and dry indoor systems, 304L is usually cost-effective. For chloride cleaning agents, brine, coastal environments, or aggressive process fluids, 316L is recommended because of its Mo content. |
Execution Standards
| Standard System | Applicable Standard | Scope |
|---|---|---|
| ASTM | ASTM A270 | Sanitary stainless steel tubing for dairy, food, and pharmaceutical-quality service when specified |
| ASTM | ASTM A269 | Seamless and welded austenitic stainless tubing for general corrosion-resisting and low/high-temperature service |
| ASTM | ASTM A312 | Seamless, welded, and heavily cold-worked austenitic stainless steel pipe for high-temperature and corrosive service |
| EN | EN 10217-7 | Welded stainless steel tubes for pressure purposes |
| JIS | JIS G3447 / JIS G3459 | Stainless sanitary pipes / stainless steel pipes |
| GB | GB/T 12771 / GB/T 13296 | Welded stainless steel pipes / seamless stainless steel tubes for fluid transport |
Application Field
Foodstuff processing: polished 316L welded stainless steel tubing for pasteurized milk transfer lines in dairy plants.
Chemical Composition
| Grade | UNS | C max % | Mn max % | Si max % | P max % | S max % | Cr % | Ni % | Mo % | Other |
|---|---|---|---|---|---|---|---|---|---|---|
| TP304 | S30400 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 18.0-20.0 | 8.0-11.0 | -- | -- |
| TP304L | S30403 | 0.035 | 2.00 | 0.75 | 0.045 | 0.030 | 18.0-20.0 | 8.0-13.0 | -- | -- |
| TP316 | S31600 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | -- |
| TP316L | S31603 | 0.035 | 2.00 | 0.75 | 0.045 | 0.030 | 16.0-18.0 | 10.0-15.0 | 2.00-3.00 | -- |
| TP321 | S32100 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0-19.0 | 9.0-12.0 | -- | Ti = 5 × (C+N) to 0.70% |
Mechanical Properties
| Grade | Tensile Strength min. MPa | Yield Strength min. MPa | Elongation min. % | Typical Heat Treatment |
|---|---|---|---|---|
| TP304 | 515 | 205 | 35 | Solution annealed / bright annealed |
| TP304L | 485 | 170 | 35 | Solution annealed / bright annealed |
| TP316 | 515 | 205 | 35 | Solution annealed / bright annealed |
| TP316L | 485 | 170 | 35 | Solution annealed / bright annealed |
| TP321 | 515 | 205 | 35 | Solution annealed / bright annealed |
Product Images
Frequently Asked Questions
Are you trading company or manufacturer?
Manufacturer, also can do trading.
How long is your delivery time?
Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, it is according to quantity.
Do you provide samples? Is it free or extra?
Yes, we could offer the sample for free charge but need pay the cost of freight.
What is your terms of payment?
Payment ≤ 2000 USD, 100% in advance. Payment ≥ 2000 USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.
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Company
TORICH INTERNATIONAL LIMITED
Location
Suite 1604-3, Hongan Plaza, #258 Die Yuan Road, Yinzhou District, Ningbo City, China
Contact Person
Richard SHEN