ASTM B804-02(2024)
Standard Specification for UNS N08367 and UNS N08926 Welded Pipe
Standard Specification for UNS N08367 and UNS N08926 Welded Pipe
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 6
- Дата публикации:
- 1 апреля 2024 г.
- Издание:
- B804
- ICS:
- 77.150.40
ABSTRACT This guide covers UNS N08367 and UNS N08926 welded pipe for general corrosion applications. The joints of the specimens shall be double or single welded and full penetration welded made. The welds shall be made either manually or automatically by an electric process involving the deposition of filler metal according to the class specified. The weld surface on either side of the weld shall be flush with the base plate. The contour of the reinforcement shall be reasonably smooth and free of irregularities. The deposited metal shall be fused uniformly into the plate surface. Transverse tension tests shall be made across the welded joint to assure that it must have the same minimum ultimate tensile strength as the specified minimum ultimate tensile strength of the plate. Transverse guided weld bend test shall be used to check cracks or other imperfections. The pipe shall be furnished with smooth ends, free of burrs and injurious defects and shall have a workmanlike finish. SCOPE 1.1 This specification covers UNS N08367 and UNS N08926 welded pipe for general corrosion applications. (Although no restrictions are placed on the sizes of pipe that may be furnished under this specification, commercial practice is commonly limited to sizes not less than 8 in. nominal diameter.) 1.2 Six classes of pipe are covered as follows: 1.2.1 Class 1 pipe shall be double welded by processes employing filler metal in all passes and shall be completely radiographed. 1.2.2 Class 2 pipe shall be double welded by processes employing filler metal in all passes. No radiography is required. 1.2.3 Class 3 pipe shall be double welded by processes employing filler metal in all passes except the inside root weld may be made without the addition of filler metal. Welds are to be completely radiographed. 1.2.4 Class 4 pipe shall be double welded by processes employing filler metal in all passes except the inside root weld may be made without the addition of filler metal. No radiography is required. 1.2.5 Class 5 pipe shall be single welded by processes employing filler metal in all passes except that the pass exposed to the inside pipe surface may be made without the addition of filler metal. Welds are to be completely radiographed. 1.2.6 Class 6 pipe shall be single welded by processes employing filler metal in all passes except that the pass exposed to the inside pipe surface may be made without the addition of filler metal. No radiography is required. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 The following safety hazards caveat pertains only to the test methods portion, Section 13, of this standard: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM B804-02(2024) is the internationally recognized standard specification for welded pipe made from UNS N08367 and UNS N08926. These pipes are primarily designed for general corrosion applications, ensuring both durability and performance in demanding environments. Issued by ASTM International, this document establishes requirements concerning manufacturing, chemical composition, mechanical properties, and testing to guarantee product consistency and safety.
The specification applies to welded pipes usually not less than 8 inches in nominal diameter and covers six distinct classes of pipe, each defined by specific welding and inspection criteria. This standard is widely used across industries where corrosion resistance, structural reliability, and verifiable quality are essential.
Key Topics
- Material Grades: Covers UNS N08367 and UNS N08926, both known for their superior corrosion resistance in harsh environments.
- Welded Pipe Classes: Six classes (1-6) define the type of welding, use of filler metal, and requirements for radiographic examination:
- Double-welded or single-welded
- Use of filler metals during welding
- Requirement (or exemption) from radiographic inspection
- Manufacturing Requirements:
- Pipes must have double or single full penetration welds
- Manual or automatic welding by electric process
- Welds should be flush, smooth, and free of surface irregularities
- Mechanical & Chemical Testing:
- Mandatory transverse tension tests across welded joints
- Transverse guided weld bend tests for defects and cracks
- Adherence to specified chemical composition per referenced ASTM standards
- Dimensional Tolerances and Quality:
- Strict requirements for pipe dimensions, wall thickness, and out-of-roundness
- Smooth ends, absence of burrs or harmful defects, and a workmanlike finish
Applications
ASTM B804-02(2024) welded pipes are essential in industries and environments demanding high resistance to general corrosion. Typical applications include:
- Chemical Processing: Used in piping systems exposed to aggressive chemicals and temperature variations.
- Petrochemical Industry: Suitable for transporting liquids and gases that may cause corrosion or stress cracking.
- Offshore and Marine Structures: Ideal for seawater and brine environments due to the high corrosion resistance of UNS N08367 and UNS N08926.
- Power Generation: Utilized in boilers, heat exchangers, and condensers where reliability and maintenance of mechanical integrity are critical.
- Pharmaceutical and Food Processing: Chosen for environments requiring corrosion-resistant and contaminant-free piping solutions.
Pipes manufactured under this standard are also specified for pressure-containing systems, with optional supplementary requirements such as intergranular corrosion testing available when requested by the purchaser.
Related Standards
The following ASTM and related standards are referenced or relevant when considering welded pipe manufacturing and testing to ASTM B804-02(2024):
- ASTM B688: Specification for Chromium-Nickel-Molybdenum-Iron Alloy Plate, Sheet, and Strip (UNS N08367)
- ASTM B625: Specification for Ni-Fe-Cr-Mo-Cu-N Low-Carbon Alloy Plate, Sheet, and Strip (UNS N08926)
- ASTM A262: Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
- ASTM A370: Mechanical Testing of Steel Products
- ASTM E8/E8M: Tension Testing of Metallic Materials
- ASME Boiler and Pressure Vessel Code, Section VIII and IX: Rules for construction and welding procedure qualifications
- AWS A5.11 and A5.14: Nickel and Nickel Alloy Welding Electrodes
These standards collectively ensure the welded pipe manufactured under ASTM B804-02(2024) meets stringent chemical, mechanical, and quality requirements vital to high-performance, corrosion-resistant piping installations.
Keywords: ASTM B804-02, UNS N08367, UNS N08926, welded pipe, corrosion resistance, ASTM pipe standard, welded pipe specification, industrial piping, chemical processing pipe, marine pipe, mechanical testing, pressure pipe standards
Технические детали
- Технический комитет
- B02 - Nonferrous Metals and Alloys
- SKU
- ASTM B804-02(2024)
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