Shanxi Zhongcheng Metal Co., Ltd.
| Payment Terms | T/T，D/P，D/A，Western Union，PayPal |
| Supply Ability | 10000tons |
| Delivery Time | 15-25days |
| Packaging Details | Wooden pallets, wooden crates, woven bags, etc. |
| Country of Origin | MADE IN CHAINA |
| Brand | Baosteel，TISCO |
| Certifications | ISO/EN 10204 Type 3.1 / 3.2 available |
| Grade | 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 / 630 (17-4PH) |
| MOQ | 100kg |
| Packaging | Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag |
| Supply Capacity | 10000tons |
| Brand Name | Baosteel，TISCO |
| Model Number | 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 |
| Certification | EN 10204 Type 3.1 / 3.2 available |
| Place of Origin | MADE IN CHAINA |
View Detail Information
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Product Specification
| Payment Terms | T/T，D/P，D/A，Western Union，PayPal | Supply Ability | 10000tons |
| Delivery Time | 15-25days | Packaging Details | Wooden pallets, wooden crates, woven bags, etc. |
| Country of Origin | MADE IN CHAINA | Brand | Baosteel，TISCO |
| Certifications | ISO/EN 10204 Type 3.1 / 3.2 available | Grade | 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 / 630 (17-4PH) |
| MOQ | 100kg | Packaging | Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag |
| Supply Capacity | 10000tons | Brand Name | Baosteel，TISCO |
| Model Number | 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 | Certification | EN 10204 Type 3.1 / 3.2 available |
| Place of Origin | MADE IN CHAINA | ||
| High Light | Mill Finish Stainless Steel Welded Pipe ，Stainless Steel Welded Pipe Schedule 5S ，Stainless Steel Welded Tube Schedule 40S | ||
The Mill Finish Stainless Steel Welded Pipe is manufactured by roll forming stainless steel coil into a cylindrical shape and longitudinally welding the seam using TIG, laser, or ERW technology. The mill finish surface is the condition directly after welding and annealing, characterized by the presence of a thin oxide scale (heat tint) and the absence of any subsequent mechanical or chemical surface treatment. This economical finish is ideal for industrial applications where surface appearance is secondary to structural integrity and corrosion resistance. It serves as an excellent base material for further fabrication, painting, or coating.
| Parameter | Details |
|---|---|
| Standards | ASTM A312, A269, A358; EN 10217-7; JIS G3459 |
| Available Grades | 304, 304L, 316, 316L, 201 |
| Outer Diameter | 6 mm – 1219 mm (1/8″ – 48″ NPS) |
| Wall Thickness | 0.5 mm – 12.7 mm (Schedule 5S, 10S, 40S) |
| Length | 6m standard; custom lengths up to 12m |
| Welding Process | TIG (GTAW), Laser, or ERW |
| Weld Seam | Single longitudinal seam |
| Heat Treatment | Annealed after welding |
| Surface Finish | Mill finish (as-annealed, unpolished) |
| End Finish | Plain ends or beveled ends |
| Grade | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| 304 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-10.5 | – |
| 304L | 0.03 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-12.0 | – |
| 316 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
| 316L | 0.03 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
| 201 | 0.15 | 0.75 | 5.5-7.5 | 0.045 | 0.030 | 16.0-18.0 | 3.5-5.5 | – |
| Grade | Tensile Strength (MPa) min | Yield Strength (MPa) min | Elongation (%) min | Hardness (HB) max |
|---|---|---|---|---|
| 304 | 515 | 205 | 35 | 201 |
| 304L | 485 | 170 | 35 | 201 |
| 316 | 515 | 205 | 35 | 217 |
| 316L | 485 | 170 | 35 | 217 |
| 201 | 515 | 275 | 35 | 241 |
Note: Tested in accordance with ASTM E8 / E8M.
Mill finish refers to the surface condition of stainless steel immediately following the final manufacturing process (welding and annealing). Key characteristics include:
| Characteristic | Description |
|---|---|
| Appearance | Dull, matte gray with visible oxide scale (heat tint) |
| Surface Texture | Slightly rough; weld seam may be visible |
| Oxide Layer | Heat tint and chromium oxide scale present |
| Reflectivity | Non-reflective |
| Consistency | May show minor variations along the pipe length |
| Cost | Lowest among all finish options |
Note: Mill finish is not recommended for decorative or sanitary applications without additional surface treatment.
| Finish | Appearance | Corrosion Resistance | Relative Cost | Typical Use |
|---|---|---|---|---|
| Mill Finish | Dull, scale present | Full (after scale removal) | $ | Industrial structures, concealed |
| Pickled | Clean, matte gray | Excellent (scale removed) | $$ | Chemical, marine, visible industrial |
| Brushed / Satin | Directional grain, semi-bright | Good (passivated) | $$$ | Handrails, furniture |
| Polished | Reflective, smooth | Good (passivated) | $$$$ | Food equipment, decorative |
| Mirror | Highly reflective | Good (passivated) | $$$$$ | Elevators, luxury architecture |
| Parameter | Tolerance |
|---|---|
| Outer diameter | ±0.4 mm for OD ≤ 48.3 mm; ±0.8% for larger |
| Wall thickness | ±12.5% |
| Length (fixed) | +0 / -3 mm |
| Straightness | 0.2% of total length |
| Ovality | Within OD tolerance |
| NPS (inch) | OD (mm) | Schedule 5S (mm) | Schedule 10S (mm) | Schedule 40S (mm) |
|---|---|---|---|---|
| 1/2″ | 21.3 | 1.65 | 2.11 | 2.77 |
| 1″ | 33.4 | 1.65 | 2.77 | 3.38 |
| 2″ | 60.3 | 1.65 | 2.77 | 3.91 |
| 4″ | 114.3 | 1.65 | 3.05 | 6.02 |
| 6″ | 168.3 | 1.65 | 3.40 | 7.11 |
| 8″ | 219.1 | 1.65 | 3.76 | 8.18 |
| 10″ | 273.1 | – | 4.19 | 9.27 |
| 12″ | 323.9 | – | 4.57 | 9.53 |
Mill finish pipes can be further processed to achieve desired surface characteristics:
| Process | Result |
|---|---|
| Pickling (acid bath) | Removes oxide scale, restores uniform matte finish |
| Mechanical Polishing | Achieves brushed, satin, or mirror finish |
| Abrasive Blasting | Creates uniform matte texture |
| Painting / Coating | Allows color matching or additional protection |
| Electropolishing | Smooths surface, enhances corrosion resistance |
| Operation | Recommendation |
|---|---|
| Cutting | Band saw, abrasive wheel, or plasma cutter |
| Welding | TIG (GTAW) or MIG (GMAW); remove mill scale at weld zone |
| Drilling | Cobalt or carbide bits; use cutting fluid |
| Surface Prep for Welding | Grind or pickle to remove oxide scale at joint area |
| Post-Weld Cleaning | Pickle or wire brush to restore corrosion resistance |
| Grinding | Use dedicated stainless steel abrasives to prevent contamination |
For inquiries, technical datasheets, or custom sizes, please contact our sales team.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller
Year Established:
2010
Total Annual:
20000000-50000000
Employee Number:
50~100
Ecer Certification：
Verified Supplier
Zhongcheng Metal: A professional supplier of stainless steel tubes and plates. We export to 11 countries, including Germany, the United States, the United Kingdom, and Japan. By adopting advanced manufacturing processes and implementing comprehensive 5S management across our operations, we provide... Zhongcheng Metal: A professional supplier of stainless steel tubes and plates. We export to 11 countries, including Germany, the United States, the United Kingdom, and Japan. By adopting advanced manufacturing processes and implementing comprehensive 5S management across our operations, we provide...
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