ASTM A358 Grade 347 347H Class 1 Steel Pipes – High-Temperature Pressure Piping Solutions

When your extend requests dependable execution in high-temperature and destructive situations, ASTM A358 Grade 347 347H Class 1 Steel Pipes provide precisely what you require. YOUFASS makes electric fusion welded (EFW) stainless steel channels with niobium stabilization for prevalent resistance to intergranular erosion. With an yearly generation capacity of 50,000 tons over 15 present day generation lines, we supply pipes from 114.3 mm to 2500 mm in breadth. Each pipe experiences 100% ultrasonic or radiographic testing to guarantee basic astuteness for your basic applications.

What Makes ASTM A358 Grade 347 347H Class 1 Steel Pipes Special?

Grade 347 and 347H stainless steel pipes are particularly planned for hoisted temperature benefit. The niobium substance stabilizes the fabric, avoiding carbide precipitation amid welding and high-heat exposure.

Here's what sets them apart:

Grade 347: Contains niobium for fabulous weldability and erosion resistance in temperatures up to 800°C
Grade 347H: Highlights higher carbon substance (0.04-0.10%) for improved crawl quality at maintained tall temperatures
Class 1: Speaks to the most noteworthy quality classification with required ultrasonic testing and strict mechanical property requirements

You'll discover these pipes crucial in petrochemical preparing, control era plants, refinery operations, and warm exchanger frameworks where fabric disappointment basically isn't an option.

Applications Across Critical Industries

ASTM A358 Grade 347 347H Class 1 Steel Pipes serve requesting applications where customary materials drop short:

Petrochemical plants: Prepare piping for catalytic wafers and reformers
Power era: Superheater and reheater tubes in boilers
Oil & gas: High-temperature transmission lines and refinery equipment
Chemical handling: Reactor vessels and warm recuperation systems
Industrial piping: Steam lines and warm liquid circuits

The niobium-stabilized structure keeps up mechanical quality indeed amid delayed presentation to temperatures between 427°C and 816°C, making these pipes your dependable choice for the hardest environments.

Technical Specifications at a Glance

Parameter	Specification
Standard	ASTM A358
Grades Available	TP304/304L/304H, 309S/310S, 316/316L, 317/317L, 321/321H, 347/347H
Pipe Class	Class 1, 2, 3, 4, 5
Manufacturing Process	Electric Fusion Welded (EFW)
Outside Diameter (OD)	114.3 mm – 2500 mm
Wall Thickness (WT)	3 mm – 50 mm
Length	Random length or fixed length
Surface Finish	Pickled & Annealed, Solution Annealed
End Finish	Plain end, Beveled end
Testing Methods	RT / UT, Hydrostatic test, Mechanical & Chemical test
Quality Testing	100% UT/RT
Packaging	Wooden box (optional steel frame), hexagonal binding + woven bag
Certifications	ISO 9001, PED, TUV, ISO 17025
Available Documents	MTC/MTR (3.1/3.2), TPI, WPS/PQR, MPS, UT/RT report

Why Choose YOUFASS for Your Piping Needs?

Manufacturing Excellence You Can Count On

As a Top 500 venture in China with over 200 talented representatives, YOUFASS combines industrial-scale generation with accuracy quality control. Our ISO 17025-accredited research facility guarantees that ASTM A358 Grade 347 347H Class 1 Steel Pipes meet or surpass worldwide standards.

Our competitive focal points include:

Flexible arrange amounts: We acknowledge orders beginning from fair 1 pipe
Fast conveyance: Your arrange can reach Tianjin Port in as small as 7 days
Comprehensive documentation: Full fabric traceability with MTC/MTR 3.1/3.2 certificates, TPI reports, and total welding qualifications
One-stop arrangement: From building meeting to on-site commissioning support

Quality Control That Protects Your Investment

We do not fair make pipes—we construct unwavering quality into each weld crease. Our quality confirmation handle includes:

Traceable crude fabric sourcing from recognized steel suppliers
In-process assessment at basic fabricating stages
100% non-destructive testing (ultrasonic and radiographic)
Hydrostatic weight testing to confirm leak-tight integrity
Final dimensional and visual assessment some time recently packaging

Every pipe clears out our office with total documentation, giving you full certainty in fabric realness and execution capability.

Why Choose YOUFASS for Your Piping Needs

Standards and Certifications:

ISO 9001 Quality Management
PED (Pressure Equipment Directive)
TÜV certification.

Certifications

Package&delivery

Clients' approval & trust

Frequently Asked Questions

Q:What is ASTM A358 347/347H Class 1 pipe?

A:It is a niobium-stabilized stainless steel pipe specifically engineered for high-temperature service. The Class 1 designation indicates the highest quality level with mandatory ultrasonic examination and stringent acceptance criteria.

Q:What is the difference between 347 and 347H?

A:Grade 347H contains higher carbon content (0.04-0.10% vs. 0.08% max for 347), which provides better high-temperature creep strength. If your application involves sustained temperatures above 540°C, 347H is typically the recommended choice.

Q:Where are 347 pipes used?

A:You'll find them in boilers, heat exchangers, refinery equipment, petrochemical processing units, and any application requiring excellent resistance to intergranular corrosion after welding or stress relief.

Q:Can you customize pipe lengths and end preparation?

A:Absolutely. We offer both random and fixed lengths, with plain or beveled ends to match your project specifications and reduce on-site preparation time.

Q:What documentation do you provide with each shipment?

A:Every order includes Material Test Certificates (MTC/MTR per EN 10204 3.1 or 3.2), ultrasonic/radiographic test reports, WPS/PQR documentation, and Material Performance Specification sheets for complete traceability.