Custom 321/347H Stainless Steel Heat Exchanger Tube ASTM A213/A312 CE/PED/Tped for Power-Plant/Nuclear-Industry

• Customization: Available
• After-sales Service: 24h Onilne Service
• Type: Seamless
• Model NO.: ASTM A213 / ASME SA213, EN 10216-5, JIS G3463
• Technique: Cold Rolled
• Material: Stainless Steel
• Surface Treatment: Polished
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Standard Specifications: ASTM SA268 ASTM A213 / ASME SA213 (Us), En 10216-5
• Steel Grades: 304/304h/304L/304ln, 316/316L, 347/347H/347hfg
• Main Process: Hot-Formed Seamless
• Coating: Pickling & Passivation, Mirror Polish
• Application1: Electronics, Industrial, Food, Boiler, Condenser
• Application 2: Pipeline Transport, Boiler Pipe, Hydraulic/Automob
• Application 3: Chemical/Electrical/Power Industry
• Certificates: ISO 9001, PED 2014/68/EU, ASME Stamp, Dnv-Gl
• Ends: Plain Ends/Bevelled Ends
• Package: Packed by Bundles, Plastic Bags, Wooden Case, etc
• Delivery: 7-35 Days
• Surface: Pickled, Bright Annealed, Polished
• Unit Leagth: 5800mm-32000mm
• Od: 12mm-76.2mm
• Wt: 0.5mm-12mm
• Transport Package: Seaworthy Package
• Specification: DN6mm-16mm
• Trademark: EZS
• Origin: China
• Production Capacity: 500000/Year

Product Description

 

Product Description

Custom 321/347H Stainless Steel Heat Exchanger Tube ASTM A213/A312 CE/PED/TPED for Power-Plant/Nuclear-Industry

Stainless Steel Boiler Tube Specifications Table

Category	Details
Standards	ASTM A213 / ASME SA213 (US), EN 10216-5 (EU), JIS G3463 (Japan), GB/T 13296 (China), DIN 17456 (Germany)
Material Grades	TP304/304L, TP316/316L, TP321/321H, TP347/347H, S31803 (Duplex), S31008 (High-Temp)
Dimensions	- OD: 6mm ~ 426mm (1/4" ~ 16") - Wall Thickness: 1mm ~ 40mm (SCH 5S ~ SCH XXS) - Length: 1m ~ 12m (Customizable)
Coatings	Pickling & Passivation, Mirror Polish (Ra ≤0.4μm), Electropolishing, Aluminized (for high-temp applications)
Processing	Seamless (Cold/Hot Finished), Welded (ERW/Laser Welded), Annealed, Solution Heat-Treated, Ultrasonic Tested
Packaging	- Bundled with steel strips & plastic caps - Wooden crates for heavy tubes - Waterproof film + seaworthy pallets (for export)
Payment Terms	T/T 30% Advance + 70% Before Shipment, LC at Sight, Western Union, PayPal (for samples)
Certifications	ISO 9001, PED 2014/68/EU, ASME Stamp, DNV-GL, TUV, NACE MR0175 (for sour gas), MTC (Mill Test Certificate)
Key Features	- High creep resistance (up to 800°C) - Acid/alkali corrosion proof - Low carbon content (304L/316L for welding) - Precision tolerances (±0.1mm)

 

321/347H Stainless Steel Boiler Tubes - Technical Specification

Introduction

321 (Ti-stabilized) and 347H (Nb-stabilized) are austenitic stainless steel tubes specifically designed for high-temperature boiler applications. These grades feature enhanced carbide stabilization to prevent sensitization and maintain corrosion resistance in welded assemblies under extreme heat conditions.

Key Differences:

• 321: Titanium (Ti) stabilized (5xC min)

• 347H: Niobium (Nb) stabilized + higher carbon (0.04-0.10%)

 

Key Features & Properties

1. Material Composition

   • 321: Cr (17-19%), Ni (9-12%), Ti (5xC min), C (≤0.08%)

   • 347H: Cr (17-19%), Ni (9-13%), Nb (10xC min), C (0.04-0.10%)

2. Temperature Performance

   • Continuous service: 800-900°C (1472-1652°F)

   • Intermittent service: Up to 1000°C (1832°F)

   • Superior to 304/316 in sustained high-heat environments

3. Critical Advantages

   • Carbide Stabilization: Ti/Nb prevents chromium carbide precipitation

   • Oxidation Resistance: Forms protective Cr2O3 scale at high temps

   • Creep Strength: 347H outperforms 321 above 600°C due to NbC formation

4. Mechanical Properties

   Property	321	347H
   Tensile Strength	≥515 MPa	≥515 MPa
   Yield Strength	≥205 MPa	≥205 MPa
   Elongation	≥40%	≥40%

 

Competitive Advantages

 Longer Service Life - Resists sensitization in 425-850°C "danger zone"
 ASME Code Compliance - Approved for Section I power boilers (SA-213)
 Weldability - No post-weld heat treatment required (vs. non-stabilized grades)
 Cost Efficiency - 347H offers better value for ultra-high-temp (>600°C) applications

 

Typical Applications

• Power Generation: Superheater/reheater tubes in coal-fired plants

• Petrochemical: Cracking furnace tubes, reformer manifolds

• Aerospace: Jet engine exhaust components

• Nuclear: Secondary circuit piping (347H preferred)

• Heat Treating: Radiant tubes, annealing covers

 

Technical Comparison: 321 vs. 347H

Factor	321	347H
Stabilizer	Titanium	Niobium
Max Temp	800°C (optimal)	900°C+ (Nb retains strength)
Weldability	Good (but Ti burns easily)	Excellent (Nb more stable)
Cost	5-8% lower	Premium for high-temp apps

 

Our Manufacturing Capabilities

• Standards: ASTM A213/ASME SA213, EN 10216-5, DIN 17456

• Sizes: OD 10.3-273mm (0.4"-10.7"), Wall 1.2-40mm

• Processing:

  • Seamless (cold/hot finished)

  • Solution annealed & pickled

  • 100% eddy current tested

• Certifications: PED 2014/68/EU, ISO 9001, NACE MR0175

Sample Product Marking:
SA-213 TP321H | 2.5" OD x 0.35" WT x 20' | HEAT #XXXX | EN 10216-5

 

Why Partner With Us?

• In-house Testing: Hydrostatic, ultrasonic, and PMI testing available

• Global Logistics: Experience shipping to EU/US/Asian power projects

• Technical Support: Provide welding procedure specifications (WPS) upon request

Request Quote: Specify required standard, dimensions (OD/WT/length), and end-use environment for optimized recommendations.

FAQ

Q:  How many days can you deliver after confirmed the order?
A:  For stock:  within 5-7 days;
      For customized product:  around 30 days;
      For special sizes:  subject to negotiation.

Q: How does your company do quality control?
A: ISO 9001:2015 certified;
     Product certificate as per EN10204 3.1 or 3.2 as per customer's request.
    
  
Q: Can I have a factory-visit?
A:  Surely. All customers are welcome to visit us in China.

Q: Can I have a trial order?
A: Of course, it is an honor for us to have the opportunity to show our quality and service. 
 

Company Profile

	Business Type:	Manufacturer/Factory
	Main Products:	Carbon Steel Pipe , Stainless Steel Pipe , Copper Nickel Tube , Heat Exchanger Tube , Boiler ...
	Registered Capital:	2000000 RMB
	Plant Area:	>2000 square meters
	Management System Certification:	ISO 9001, ISO 14001, OHSAS/ OHSMS 18001, ANSI/ESD
	Average Lead Time:	Peak Season Lead Time: 1-3 months Off Season Lead Time: within 15 workdays

SGS Serial NO. :

QIP-ASI199413Report Verification

EZ STEEL INDUSTRIAL Co., Ltd, together with LONG-RUN METALS Co., Ltd, is the export division and window company of EZ STEEL GROUP, which was founded in 1996 and has been committed to the development and manufacturing of industrial tubes in the past 20 years. It is one of the largest steel tube manufacturing enterprise groups in China. The group possess fixed assets over 200million and more than 800 employees with annual production capacity over 300 thousand tons.

The company has continuously introduced the world advanced manufacturing equipment and now is able to produce welded and seamless steel tube, copper tube and nickle alloy tube. We also have our own coating facilities and workshops for further processing. After years of development, EZ STEEL GROUP and the affiliated enterprises have obtained many kinds of domestic and international certifications including ISO 9001 Quality Management System Certification, ISO14000 Environment Management System Certification, CE, License for Manufacture of Pressure Piping in China, etc. The company has obtained good domestic achievements and is the nominated supplier of CNPC and CNOOC. The product are exported to Southeast Asia, the Middle East and Africa, Europe, Australia, North and Latin Americas via trade companies, and are widely used in pipeline works, foundation works, steel structure works, boiler and condenser fabrication, oil refinery plant, power plant, sugar-making plant, ship-building and offshore construction projects etc.

Holding the concept of First-class Brand, First-class Service, First-class Value, EZ STEEL GROUP is aiming to build up a win-win enterprise platform for both our customers and employees.

CONTACT US
Contact: Rosy Xu
EZ STEEL INDUSTRIAL CO., LTD
Add: No.199,  Xiangfu Road, Yuhua Industrial Zone, Changsha City , P.R China 

Pls. do not hesitate to contact me if you have any questions!

You are warm welcomed to visit our factory!!!

Thank you for visiting our products & Looking forward to hearing from you!