GB/T 47975-2026Seamless steel pipes for trenchless drill pipe (English PDF)

Foreword

Drafting.

This document adopts T/CISA137-2021 "Seamless Steel Pipes for Trenchless Drill Pipes" published by the China Iron and Steel Association.

Introduction

Trenchless technology is an advanced and environmentally friendly method for laying, repairing, or replacing underground pipelines, conduits, and cables without creating surface trenches.

Environmentally friendly construction technology. Compared with traditional trenching, this technology has the advantages of lower overall cost, shorter construction period, less environmental impact, and no disruption to traffic.

Trenchless construction technology boasts advantages such as good ventilation, high construction safety, wide adaptability, small work site requirements, and the ability to avoid obstacles. It has evolved from a mere "alternative" to a more advanced technology.

The "alternative solution" has been transformed into the "preferred solution" for the construction, repair and management of urban underground pipe networks, becoming the mainstream approach to the development and utilization of underground space.

Trenchless tunneling is a high-tech and risky systems engineering project. Therefore, drill pipe, as a conventional and high-cost consumable material, is essential.

The consistency, stability, and safety of the materials have a significant impact on the success of construction. With the continuous innovation of trenchless technology... The new technology also places increasingly higher demands on the drilling rig's crossing capabilities, the selection and matching of drill rods and drilling tools, and the configuration of the pilot hole trajectory.

Before the formulation of national standards for seamless steel pipes for trenchless drill pipes, enterprises adopted the group standard T/CISA137-2021 "Seamless Steel Pipes for Trenchless Drill Pipes".

The demand for new trenchless technologies and processes has driven the research, development, and application of these products. Through large-scale market application testing, this group standard has proven its technical effectiveness.

The technology is mature and sufficiently necessary for industry, providing a solid foundation for its transformation into a recommended national standard, and is conducive to fully leveraging the standard's role in promoting... The role of technological progress in leading industrial upgrading. Seamless steel pipes for trenchless drill pipes

1 Scope

This document specifies the designation method, ordering details, manufacturing process, technical requirements, and testing methods for seamless steel pipes used in trenchless drill pipes. Inspection rules, packaging, marking, and quality certificates.

This document applies to seamless steel pipes (hereinafter referred to as "steel pipes") used in the manufacture of drill pipes for trenchless horizontal directional drilling.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

GB/T 222 Permissible Deviations in Chemical Composition of Finished Steel and Alloy Products

GB/T 223.5 Determination of Acid-Soluble Silicon and Total Silicon Content in Iron and Steel - Reduced Molybdate Spectrophotometric Method

GB/T 223.8 Determination of Aluminum Content in Iron and Steel and Alloys by Titration and Spectrophotometry

GB/T 223.11 Determination of Chromium Content in Iron and Steel and Alloys by Titration and Spectrophotometry

GB/T 223.19 Chemical Analysis Methods for Iron and Steel Alloys - Determination of Copper Content by Neo-Copper-Chloroform Extraction Spectrophotometric Method

GB/T 223.23 Determination of Nickel Content in Iron and Steel and Alloys - Dimethylglyoxime Spectrophotometric Method

GB/T 223.59 Determination of phosphorus content in iron and steel and their alloys - Bismuth-phosphomolybdenum blue spectrophotometric method and antimony-phosphomolybdenum blue spectrophotometric method

GB/T 223.84 Determination of Titanium Content in Iron and Steel and Alloys - Diantipyrine Methane Spectrophotometric Method

GB/T 223.85 Determination of sulfur content in iron and steel and their alloys by infrared absorption method after combustion in an induction furnace

GB/T 223.86 Determination of total carbon content in iron and steel and their alloys by infrared absorption method after combustion in an induction furnace

GB/T 228.1 Metallic materials - Tensile testing - Part 1: Test method at room temperature

GB/T 229 Metallic materials Charpy impact test method

GB/T 2102 Acceptance, Packaging, Marking and Quality Certificate of Steel Pipes

GB/T 2975 Sampling Location and Specimen Preparation for Mechanical Property Testing of Steel and Steel Products

GB/T 4336 Determination of Multi-Element Content in Carbon Steel and Medium-Low Alloy Steels by Spark Discharge Atomic Emission Spectrometry (Conventional Method)

GB/T 5777 Automatic circumferential ultrasonic testing of longitudinal and/or transverse defects in seamless and welded (excluding submerged arc welded) steel pipes

GB/T 7735 Automatic eddy current testing for defects in seamless and welded (excluding submerged arc welded) steel pipes

GB/T 10561-2023 Determination of Nonmetallic Inclusions in Steel - Standard Rating Chart Microscopic Examination Method

GB/T 12606 Automatic circumferential flux leakage detection for longitudinal and/or transverse defects in seamless and welded (excluding submerged arc welding) ferromagnetic steel pipes

GB/T 17395 Dimensions, shape, weight and permissible deviations of steel pipes

GB/T 20066 Sampling and sample preparation methods for the determination of chemical composition of steel and iron

GB/T 20123 Determination of Total Carbon and Sulfur Content in Iron and Steel - Infrared Absorption Method After Combustion in a High-Frequency Induction Furnace (Conventional Method)

GB/T 30062 Steel Pipe Terminology

YB/T 4149 Continuously Cast Round Tube Billets

YB/T 5221 Hot-rolled and forged round tube billets of alloy structural steel