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Quality Mill Finish Stainless Steel Welded Pipe Tube Schedule 5S To 40S Cut To Size factory
Quality Mill Finish Stainless Steel Welded Pipe Tube Schedule 5S To 40S Cut To Size factory

Mill Finish Stainless Steel Welded Pipe Tube Schedule 5S To 40S Cut To Size

Basic Properties
Place of Origin: MADE IN CHAINA
Brand Name: Baosteel，TISCO
Certification: EN 10204 Type 3.1 / 3.2 available
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
Trading Properties
Minimum Order Quantity: 100kg
Price: Negotiable (Request a Quote)
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Ability: 10000tons
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Molybdenum Alloy Stainless Steel Pipe

Stainless Steel Pipe Chloride Resistance

Mill Finish Stainless Steel Welded Pipe
Product Summary
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 ...

Product Details

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Mill Finish Stainless Steel Welded Pipe

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Stainless Steel Welded Pipe Schedule 5S

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Stainless Steel Welded Tube Schedule 40S
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
Price: Negotiable (Request A Quote)
Packaging: Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag
Delivery Time: 15-25days
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Capacity: 10000tons
Product Description

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.

Product Specifications
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
Chemical Composition (Typical Values, %)
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 –
Mechanical Properties (at Room Temperature)
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.

What is Mill Finish?

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.

Key Features
  • Lowest Cost Option – Most economical stainless steel pipe finish
  • Full Corrosion Resistance – Inherent stainless steel protection (oxide scale does not impair performance)
  • Annealed Condition – Soft, ductile, and easy to fabricate
  • Good Structural Integrity – Ideal for load-bearing and pressure applications
  • Excellent Base for Fabrication – Easily welded, cut, drilled, and machined
  • Ready for Surface Treatment – Can be pickled, polished, painted, or coated as needed
  • No Decorative Requirements – Suitable where appearance is not critical
  • Wide Size Range – Available from 6 mm to 1219 mm OD
Mill Finish vs. Other Finishes
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
Dimensional Tolerances (ASTM A312)
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
Schedule Wall Thickness (ASME B36.19)
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
Post-Finishing Options

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
Applications
Industrial & Process Piping
  • Chemical and petrochemical process lines
  • Cooling water systems
  • Utility steam and condensate lines
  • Compressed air systems
Water Treatment
  • Raw water intake lines
  • Wastewater and effluent lines
  • Filtration system piping
Oil & Gas
  • Low-pressure gathering lines
  • Fire water mains
  • Utility water distribution
Structural
  • Handrails and guardrails (concealed or painted)
  • Equipment supports and platforms
  • Scaffolding and temporary structures
General Industrial
  • Conveyor systems
  • Machine guards
  • Plant utility piping
Agricultural
  • Irrigation supply lines
  • Livestock watering systems
  • Greenhouse structures (painted)
Fabrication Guidelines
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
Contact Us

For inquiries, technical datasheets, or custom sizes, please contact our sales team.

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