DL/T 752-2023 in English

VALID

The code of practice for dissimilar steels welding in power plant

Issued on:2023-10-11
Implemented on:2024-04-11
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $220.00
$214.00

Standard No:	DL/T 752-2023
Document status:	VALID
Title in English:	The code of practice for dissimilar steels welding in power plant
Title in Chinese:	火力发电厂异种钢焊接技术规程
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2023-10-11
Implemented on:	2024-04-11
Superseding:	DL/T 752-2010 The code of the welding on dissimilar steel for power plant
Professional Classification:	DL-Electricity
Related Keywords:	austenitic/ferritic dissimilar steel welding nickel-based welding materials hardness test nickel-based welding materials examples nickel-based alloy welding materials welding wires
Related Topics:	Welding Technology Welding Technology thermal power plant xenogeneic complement Alien Influenza xenogeneic organ Welding Technical Regulations Dissimilar steel welding standards General welding technology for dissimilar rails Specifications for welding of dissimilar steels Compilation of technical standards for thermal power plants Thermal power plant debugging technology dl752-2023 dl/t2667-2023 dl/t 752-2023 dl/t2680-2023 dl/t748-2023 dl/t752-2023 dl/t2699-2023 dl/t5215-2023

Introduction

Core changes in the standard revision

Technical dimension	DL/T 752-2010	202X Draft for Approval
Material brand	Based on the old version of the standard	Updated to current standards such as GB/T 713-2014
Selection of welding materials	Principle provisions	Added Nickel-based welding materials examples and recommendation tables
Groove design	Single form	Add 3 optional grooves

Analysis of key technical points

4.1 Selection of welding materials

The new regulations particularly emphasize the application of nickel-based alloy welding materials in austenitic/ferritic dissimilar steel welding. Appendix C lists in detail the chemical composition control requirements of materials such as ERNiCr-3. Typical application case: P91/T92 joints are recommended to use welding wires with a Ni content of ≥62%, and the delta ferrite content of the deposited metal needs to be controlled at 3-10FN.

Implementation suggestions

Pre-welding preparation: Strictly check the parent material grade according to Table 1, and pay special attention to the new requirements for S content of P92 steel in GB/T 5310-2017
Process assessment: Refer to DL/T 868-202X to add the coverage assessment of nickel-based welding materials
Hardness test: When using the portable Brinell hardness tester specified in DL/T 1719, the test surface roughness Ra≤1.6μm

Typical problem handling

A 660MW unit Type IV cracking occurred in the TP347H/12Cr1MoV dissimilar steel joint of the final reheater. After adjusting the tempering temperature to 740±10℃ and extending the insulation time according to the new regulation 8.3, the hardness gradient qualified rate increased to 98%.

More samples: GB 18306-2015 JGJ 94-2008 QC/T 942-2021

Sample only — not a preview of DL/T 752-2023

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