DL/T 1918-2018 in English

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Standard No:	DL/T 1918-2018
Document status:	VALID
Title in English:	Specifications for Aluminum copper alloy in power engineering grounding
Title in Chinese:	电力工程接地用铝铜合金技术条件
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2018-12-25
Implemented on:	2019-05-01
ICS Classification:	27.100-Power stations in general
Chinese Classification:	F29-Others
Professional Classification:	DL-Electricity
Related Keywords:	copper content aluminum copper alloy pre-oxidation layer copper content traditional galvanized steel copper content limit copper element resistivity
Related Topics:	Copper Alloy Standard Copper Alloy Standard grounding Power Engineering Aluminum Copper Aluminum Copper Alloy Grounding standard copper alloy Ground box technology for power cable lines

Introduction

Analysis of the core content of the standard

Technical dimensions	Requirements for aluminum-copper alloys	Comparison with traditional galvanized steel
Copper content limit	≤5% (anti-heavy metal pollution)	No copper element
Resistivity (20℃)	≤4×10⁻⁸Ω·m	1.7×10⁻⁷Ω·m
Corrosion rate	≤0.05mm/a (pH5-10 soil)	0.1-0.3mm/a

Aluminum-copper alloy (ACR) must meet the following requirements:

Composition control: Cu 3.0-5.0%, Re 0.1-0.3%, impurity Fe<0.5%
Metallurgical structure: α+β solid solution matrix + dispersed CuAl₂ phase (particle size ≤80μm)
Surface treatment: shot peening roughness Ra 5-8μm, pre-oxidation layer copper content ≥3%

Typical case: After aging at 200℃,>ACR-B-50 rod resistance change rate <5%, meet:

Select according to the grounding environment:

Soil pH value	Recommended specifications	Connection method
5.0-7.5	ACR-S40×4 strip	Argon arc welding
7.5-10.0	ACR-B-50 rods	Exothermic welding

After welding, seal with asphalt paint (≥150mm on both sides)
Crossing metal components need to be insulated
Focus on checking the shot peening coverage during acceptance (≥1mm deformation layer under 100x microscope)

Compared with DL/T 1312 copper-clad steel standard, this standard has the following advantages:

Environmental advantages: copper content is reduced by more than 60%
Cost-effectiveness: material cost is reduced by about 35%
Technology innovation: original shot peening + pre-oxidation composite treatment process

More samples: YD/T 3934-2021 QC/T 942-2021 JC/T 2453-2018

Sample only — not a preview of DL/T 1918-2018