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Quality Welded 304 Stainless Steel Round Pipe ASTM A312 Mirror Finish For Handrails Railings factory
Quality Welded 304 Stainless Steel Round Pipe ASTM A312 Mirror Finish For Handrails Railings factory
Quality Welded 304 Stainless Steel Round Pipe ASTM A312 Mirror Finish For Handrails Railings factory

Welded 304 Stainless Steel Round Pipe ASTM A312 Mirror Finish For Handrails Railings

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

Welded 304 Stainless Steel Round Pipe
Product Summary
Welded stainless steel round pipe is manufactured by forming a flat stainless steel strip or sheet into a cylindrical shape and welding the longitudinal seam. This process creates a cost-effective, dimensionally consistent pipe suitable for a wide range of industrial, commercial, and architectural ...

Product Details

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Welded 304 Stainless Steel Round Pipe

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Stainless Steel Round Pipe ASTM A312

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SS Round Pipe Mirror Finish
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

Welded stainless steel round pipe is manufactured by forming a flat stainless steel strip or sheet into a cylindrical shape and welding the longitudinal seam. This process creates a cost-effective, dimensionally consistent pipe suitable for a wide range of industrial, commercial, and architectural applications.

While seamless pipes are preferred for extremely high-pressure environments, welded pipes offer exceptional value for general-purpose applications where pressure ratings are moderate, but cost efficiency, size availability, and dimensional accuracy are priorities.

Modern welding technologies — including Tungsten Inert Gas (TIG), Laser, and Electric Resistance Welding (ERW) — produce weld seams that are virtually indistinguishable from the base metal, with many welded pipes capable of meeting or exceeding the same pressure ratings as seamless alternatives.

Specifications at a Glance
Parameter Details
Product Name Welded Stainless Steel Round Pipe
Standards ASTM A312, A358, A778, A269, EN 10217-7, JIS G3459, GB/T 12771
Grades 304, 304L, 316, 316L, 316Ti, 321, 310S, 317L, 904L, Duplex 2205
Dimensions 1/2″ – 48″+ OD (12.7mm – 1219mm+)
Wall Thickness Schedule 5S, 10S, 20, 40, 80 (0.5mm – 20mm)
Length 3m – 12m (random, fixed, or custom lengths)
Weld Types ERW (Electric Resistance Welded), EFW (Electric Fusion Welded), TIG
Surface Finish Mill Finish, Pickled, Polished (Mirror), Brushed (Hairline)
Manufacturing Process Cold Rolled / Hot Rolled strip → Forming → Welding → Heat Treatment → Sizing
Available Grades & Standards
Grade Standard Key Characteristics Typical Applications
304 ASTM A312 General-purpose, good corrosion resistance Food processing, dairy, beverage lines
304L ASTM A312 Low carbon, better weldability Chemical tanks, welded equipment
316 ASTM A312 Molybdenum added, chloride resistance Marine, pharmaceutical, coastal
316L ASTM A312 Low-carbon version of 316 High chloride environments
316Ti ASTM A249 Titanium stabilized, high temperature Exhaust systems, heat exchangers
321 ASTM A249 Titanium stabilized, 800-1500°F service Aircraft, exhaust stacks
310S ASTM A312 High temperature up to 2000°F Furnace parts, heat treatment
317L ASTM A312 Higher molybdenum than 316 Pulp & paper, chemical processing
904L ASTM A312 Super austenitic, severe corrosion Sulfuric acid, seawater
2205 ASTM A358 Duplex, high strength + SCC resistance Offshore, desalination
Chemical Composition (%)
Grade C Mn Si Cr Ni Mo Others
304 ≤0.08 ≤2.00 ≤1.00 18.0-20.0 8.0-11.0 – –
304L ≤0.030 ≤2.00 ≤1.00 18.0-20.0 8.0-12.0 – –
316 ≤0.08 ≤2.00 ≤1.00 16.0-18.0 10.0-14.0 2.0-3.0 –
316L ≤0.030 ≤2.00 ≤1.00 16.0-18.0 10.0-14.0 2.0-3.0 –
310S ≤0.08 ≤2.00 ≤1.50 24.0-26.0 19.0-22.0 – –
2205 ≤0.030 ≤2.00 ≤1.00 22.0-23.0 4.5-6.5 3.0-3.5 N 0.14-0.20
Mechanical Properties (Typical)
Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HB max)
304 ≥515 ≥205 ≥40 ≤201
304L ≥485 ≥170 ≥40 ≤201
316 ≥515 ≥205 ≥40 ≤217
316L ≥485 ≥170 ≥40 ≤217
310S ≥515 ≥205 ≥40 ≤217
2205 ≥620 ≥450 ≥25 ≤293
Physical Properties
Property 304/304L 316/316L 2205
Density (g/cm³) 7.93 7.98 7.80
Modulus of Elasticity (GPa) 193 193 190
Thermal Conductivity (W/m·K) 16.2 16.3 19.0
Coefficient of Thermal Expansion (10⁻⁶/°C) 17.2 17.2 13.7
Electrical Resistivity (μΩ·cm) 72 74 80
Welded stainless steel round pipe Dimensions & Schedule Chart
Standard Pipe Sizes (ANSI B36.19) – Welded
NPS (inch) OD (mm) Schedule 5S (mm) Schedule 10S (mm) Schedule 40S (mm) Schedule 80S (mm)
1/2″ 21.3 1.65 2.11 2.77 3.73
3/4″ 26.7 1.65 2.11 2.87 3.91
1″ 33.4 1.65 2.77 3.38 4.55
1-1/2″ 48.3 1.65 2.77 3.68 5.08
2″ 60.3 1.65 2.77 3.91 5.54
3″ 88.9 2.11 3.05 5.49 7.62
4″ 114.3 2.11 3.05 6.02 8.56
6″ 168.3 2.77 3.40 7.11 10.97
8″ 219.1 2.77 3.76 8.18 12.70
10″ 273.1 3.40 4.19 9.27 15.09
12″ 323.9 3.40 4.57 10.31 17.48
14″ 355.6 3.96 4.78 11.13 19.05
16″ 406.4 4.19 4.78 12.70 21.44
18″ 457.2 4.19 4.78 14.27 23.83
20″ 508.0 4.78 5.54 15.09 26.19
24″ 609.6 5.54 6.35 17.48 30.96

Larger diameters up to 48″ available upon request

Dimensional Tolerances (ASTM A312)
Parameter Tolerance
OD (≤48″) ±0.5%
OD (>48″) ±1.0%
Wall Thickness ±10%
Length (fixed) +3mm / -0mm
Straightness ≤1.5mm per meter
Out-of-Roundness Within OD tolerance
Key Process Steps Explained:
Step Description
Coil Preparation High-quality stainless steel coil is inspected and slit to the required width
Forming The strip is progressively roll-formed into a cylindrical shape
Welding Longitudinal seam is welded using TIG, ERW, or Laser (no filler metal for autogenous welding)
Weld Bead Trimming Internal and external weld beads are trimmed for a smooth surface
Heat Treatment Solution annealing at 1040-1120°C to restore corrosion resistance
Sizing Pipe passes through sizing rolls to achieve precise OD
Pickling/Polishing Removal of oxide scale and surface finishing
Welded vs. Seamless – Which to Choose?
Feature Welded Pipe Seamless Pipe
Cost 20-30% lower Higher
Lead Time Shorter Longer
Size Range 1/2″ to 48″+ 1/2″ to 24″
Wall Thickness Consistency Excellent Good
Weld Seam Present (but high quality) None
Pressure Rating High (meets ASTM standards) Very High
Corrosion Resistance Excellent (with proper HT) Excellent
Best For General industrial, large diameters, cost-sensitive projects Extreme high pressure, critical safety applications

Key Insight: Modern welded pipes — especially those that are solution annealed and full-penetration welded — perform nearly identically to seamless pipes for the vast majority of applications. Many ASTM standards treat welded and seamless as interchangeable for pressure ratings.

Contact Us for a Welded stainless steel round pipe Quote
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