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Quality Astm A312 Stainless Steel Seamless Pipe TP304 TP316L Welded Seamless SS Pipe factory
Quality Astm A312 Stainless Steel Seamless Pipe TP304 TP316L Welded Seamless SS Pipe factory

Astm A312 Stainless Steel Seamless Pipe TP304 TP316L Welded Seamless SS Pipe

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
Tags

Molybdenum Alloy Stainless Steel Pipe

Stainless Steel Pipe Chloride Resistance

Stainless Steel Seamless Pipe TP316L
Product Summary
Astm A312 Stainless Steel Pipe TP304 TP316L Seamless Welded

Product Details

Highlight:

Stainless Steel Seamless Pipe TP316L

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Stainless Steel Seamless Pipe Welded

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TP304 Seamless SS Pipe
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

ASTM A312 is the most widely recognized American standard specification for seamless, straight-seam welded, and heavily cold-worked stainless steel pipes intended for high-temperature and general corrosive service.

At [Your Company Name], we supply fully certified ASTM A312 stainless steel pipes in a comprehensive range of diameters, wall thicknesses, and grades. Whether your project requires seamless pipes for high-pressure applications or welded pipes for cost-efficiency, our inventory meets strict NACE MR0175 and ISO 9001 standards.

Key Target Applications: Chemical processing, oil & gas refineries, marine engineering, heat exchangers, and pharmaceutical lines.

Key Specifications
Parameter Range / Details
Standard ASTM A312 / ASME SA312
Manufacturing Type Seamless (SMLS) – no weld seam
Material Grades TP304, TP304L, TP316, TP316L
Outer Diameter (OD) 10.3mm – 609.6mm (1/8″ – 24″)
Wall Thickness (WT) 0.2mm – 60mm (SCH 5S, 10S, 40S, 80S, 160, XXS)
Length 5 – 12 meters, or custom cut
End Finish Plain / Beveled / Threaded
Surface Condition Annealed & pickled / Bright annealed / Passivated / Polished
Testing Hydrostatic test, PMI, UT, Eddy current, Third-party (SGS/BV)
Certification ISO 9001, MTC EN 10204 3.1, RoHS
Delivery Condition Solution annealed, cold drawn or hot rolled
Chemical Composition (wt%, max unless noted)
Grade C Mn P S Si Cr Ni Mo
TP304 0.08 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 —
TP304L 0.035 2.00 0.045 0.030 1.00 18.0–20.0 8.0–13.0 —
TP316 0.08 2.00 0.045 0.030 1.00 16.0–18.0 11.0–14.0 2.00–3.00
TP316L 0.035 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00

Key Advantage of TP316/316L: The addition of molybdenum (Mo) provides superior resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking, making it ideal for marine, chemical, and high-chloride environments.

Mechanical Properties (Solution Annealed Condition)
Grade Tensile Strength (MPa) min Yield Strength (MPa) min Elongation % min
TP304 515 205 35
TP304L 485 170 35
TP316 515 205 35
TP316L 485 170 35

Heat Treatment: Solution annealed at 1900°F (1040°C) minimum, followed by rapid cooling.
Service Temperature Range: Cryogenic to 870°C (depending on grade). TP304/316 is suitable for continuous service up to 800°C in oxidizing atmospheres.

Dimensional Tolerances (ASTM A312 – Seamless Pipe)
Outside Diameter (OD) Tolerance
NPS (inch) Positive Tolerance (in / mm) Negative Tolerance (in / mm)
1/8 – 1½ +0.015" / 0.4mm -0.031" / 0.8mm
>1½ – 4 +0.031" / 0.8mm -0.031" / 0.8mm
>4 – 8 +0.062" / 1.6mm -0.031" / 0.8mm
>8 – 18 +0.093" / 2.4mm -0.031" / 0.8mm
>18 – 26 +0.125" / 3.2mm -0.031" / 0.8mm
Wall Thickness Tolerance (Seamless Pipe)
NPS Condition Positive Tolerance Negative Tolerance
1/8 – 2½ All +20.0% -12.5%
3 – 18 t/D ≤ 5% +22.5% -12.5%
3 – 18 t/D > 5% +15.0% -12.5%
≥20 t/D ≤ 5% +22.5% -12.5%
≥20 t/D > 5% +15.0% -12.5%

t/D = ratio of wall thickness to outside diameter

Why Choose Seamless Construction?
Feature Benefit
No weld seam Eliminates weak points; uniform mechanical properties
Higher pressure rating Suitable for high-pressure hydraulic and steam systems
Better fatigue resistance Ideal for cyclic pressure and vibration applications
Superior corrosion resistance No weld-affected zone susceptible to preferential attack
Wider temperature range Performs reliably from cryogenic to high temperatures
Typical Applications – High-Pressure & Corrosive Service
Industry Specific Uses Recommended Grade
Oil & Gas Downhole tubing, flow lines, offshore platforms TP316 / 316L
Chemical Processing Reactors, heat exchangers, transfer lines for acids/alkalis TP316L
Power Generation Boiler tubes, superheater lines, high-pressure steam TP304H / TP316H
Marine Engineering Seawater cooling lines, shipbuilding, and desalination plants TP316 / 316L
Pharmaceutical & Biotech High-purity systems, sanitary piping TP304L / 316L (electropolished)
Hydrogen & Alternative Energy High-pressure hydrogen transport, fuel cell systems TP316 / 316L
Hydraulic & Instrumentation Precision seamless tubing for control systems TP304 / 316
Available Surface Finishes for Seamless Pipe
Finish Description Typical Application
Mill Finish (Annealed & Pickled) Oxide scale removed by acid pickling General industrial piping
Bright Annealed (BA) Bright, reflective surface; no scaling Clean systems, food/dairy
Polished (No.4 / 180-600 grit) Uniform brushed finish Architectural, sanitary
Mirror Polish (#8) Highly reflective Decorative, ultra-clean
Electropolished Smooth, passive surface Pharmaceutical, semiconductor
Why Prefer ASTM A312 Stainless Steel Pipes?

Engineers choose A312 pipes over generic stainless alternatives because of the strict manufacturing controls. Here is what you get:

1. Superior Corrosion Resistance

The controlled chemical composition (specifically Chromium & Nickel %) ensures resistance to oxidation, scaling, and intergranular corrosion. Grade TP316L specifically offers enhanced resistance to pitting in seawater and acidic media.

2. High Temperature Sustainability

Unlike PVC or carbon steel, A312 stainless maintains its mechanical integrity at temperatures up to 1500°F (815°C). Ideal for superheaters and boiler tubes.

3. 100% Dimensional Accuracy

Compliance with ASTM A312 means strict tolerances on OD, wall thickness, and straightness. No “undersized" problems when connecting with A182 forged fittings or A403 butt weld elbows.

4. Weldability (L-Grades)

The Low Carbon (L) variants (304L, 316L) eliminate the need for post-weld annealing, saving fabrication time and labor costs.

Need Certified ASTM A312 Stainless Steel Pipe for your next shutdown or long-term project?

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