ASTM B474 EFW Pipe Manufacturer & Weld Filler Specification Table

What is ASTM B474 EFW Pipe?

ASTM B474 is a specification standard for electric-fusion-welded (EFW) nickel and nickel-cobalt alloy pipe. ASME SB 474 EFW pipes are classified into five categories based on the welding method, namely Class 1, Class 2, Class 3, Class 4, and Class 5. It covers the requirements for pipes in nominal sizes from NPS 3/4 to NPS 30, including Schedule 5S, 10S, 40S, and 80S. The pipe material can be classified into different grades, including ASTM B474 UNS N02200 Pipe, Grade UNS N06002, UNS N06030, UNS N06035, UNS N06200, etc.

Understanding the 5 Classes of ASTM B474 EFW Pipe

When sourcing ASME SB474 welded pipe, the welding class dictates the fabrication and non-destructive testing (NDT) requirements. We manufacture all five standardized classes to meet your specific pressure and service limits:

Class 1: Double-welded using filler metal in all passes. Requires complete joint radiography (100 percent X-ray) of all welds.

Class 2: Double-welded using filler metal in all passes. No radiography is required unless specified.

Class 3: Single-welded using filler metal in all passes. The weld root must be fully penetrated, and the pipe requires 100 percent joint radiography.

Class 4: Same as Class 3, but without joint radiography.

Class 5: Double-welded using filler metal in all passes. Spot radiography is performed to verify weld quality.

We offer nominal sizes ranging from NPS 3/4 to NPS 30, with thickness schedules including Schedule 5S, 10S, 40S, and 80S to handle diverse structural and hydraulic requirements.

Chemical Composition

1. Product Analysis of Plate-The pipe manufacturer shall make an analysis of each mill heat of plate material. The product analysis so determined shall meet the requirements of the plate specification to which the material was ordered.

2. Product Analysis of Weld-The pipe manufacturer shall make an analysis of the finished deposited weld material from each lot of pipe. The chemical composition of the weld deposit shall fall within the chemical composition limits of the applicable AWS filler metal specification for the corresponding grade shown in Table 1 (or higher alloyed filler metal when approved by the purchaser). or shall, subject to the purchaser approval, be a filler metal more highly alloyed than the base metal when needed for corrosion resistance or other properties. The composite analysis variations from Table 1 limits, that are caused by the dilution of the weld metal with the base metal, shall be agreed upon between purchaser and manufacturer.

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ASTM B474 EFW Pipe and Weld Filler Materials

^ANew designation established in accordance with ASTM E527 and SAE J 1086,Practice for Numbering Metals and Alloys (UNS).
^BRegistered Trademark of Haynes International.
^CApproved by AWS but not published."
^DNo AWS classification existed at the time of this writing-consult material manufacturer for recommended fller metal.
^EFiller metal used is highly dependent on intended service temperature-consult material manufacturer for specific filler metal for end use temperature.
^FRegistered Trademark of Carpenter Steel."
^GRecommended filler metal-this material is highly dependent on intended service temperature for best filer metal selection-consult material manufacturer for specific filler metal given the end use temperature."
 

Rigorous Quality Control and Testing Standards

To ensure every ASTM B474 pipe meets strict international engineering standards, we perform comprehensive non-destructive and mechanical tests:

• Radiographic Examination: Full X-ray testing of longitudinal weld lines to ensure 100 percent joint integrity (standard for Class 1 and Class 3).
• Hydrostatic Testing: Every pipe section is pressure-tested to verify there are zero leak paths or micro-cracks along the welded seam.
• Weld Bend & Tension Testing: Transverse tension and bend tests confirm that the welded joint exhibits equivalent mechanical properties to the base metal.
• Dimensions and Tolerances: Outside diameter, wall thickness, and out-of-roundness are strictly measured using precision calibrated instruments.

Leading ASTM B474 Welded Pipe Supplier

As an experienced international pipeline equipment exporter, we provide complete material traceability, EN 10204 3.1 mill test certificates, and customized piping spool pre-fabrication services. Whether you require standard sizes or custom heavy-wall configurations, we deliver direct-factory solutions with competitive lead times.

Contact us today with your specific pipe grade, class, size, and schedule requirements. Our engineering team is ready to provide a fast, accurate technical quote.

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