NB/T 47018.2-2017 (NB/T47018.2-2017)

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NB/T 47018.2-2017: PDF in English (NBT 47018.2-2017)
NB/T 47018.2-2017
NB
ENERGY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 25.160.10
J 33
Replacing NB/T 47018.2-2011
Technical Permission of Welding Materials for
Pressure Equipment Section 2: Electrodes for Steel
ISSUED ON: MARCH 28, 2017
IMPLEMENTED ON: AUGUST 01, 2017
Issued by: National Energy Administration
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Technical Requirements ... 7
4 Bending Test of Deposited Metal ... 14
5 Product Marking ... 15
Appendix A (Informative) Comparison of Electrode Model ... 17
Foreword
NB/T 47018-2017 Technical Permission of Welding Materials for Pressure
Equipment can be divided into 5 Parts:
--- Part 1: General Rule;
--- Part 2: Electrodes for Steel;
--- Part 3: Steel Electrodes and Rods for Gas Shielded Arc Welding;
--- Part 4: Electrodes and Fluxes or Submerged Arc Welding;
--- Part 5: Stainless-Steel Strip Electrodes and Fluxes for Overlay Welding.
This Part is the Part 2 of NB/T 47018-2017.
This Part was drafted as per the rules specified in GB/T 1.1-2009 Directives for
Standardization – Part 1: Structure and Drafting of Standards.
This Part revised NB/T 47018.2-2011 Technical Permission of Welding Materials for
Pressure Equipment - Part 2: Electrodes for Steel. Compared with NB/T 47018.2-2011,
the major technical Changes of this Part are as follows:
--- According to the provisions of national standards on electrodes of 2012 Version,
change the name of GB/T 5117 Carbon Steel Covered Electrodes into Electrodes
for Non-Alloy and Fine-Grain Steels; change the name of GB/T 5118 Low Alloy
Steel Covered Electrodes into Covered Electrodes for Manual Metal Arc Welding
of Creep-Resisting Steels; and newly add GB/T 32533 Covered Electrodes for
Manual Metal Arc Welding of High-Strength Steels.
--- Reserve 7 electrode models of E4303, E4315, E4316, E5015, E5016, E5018,
E5515-G in the electrodes for non-alloy and fine grain steels; and the model
formulation of the electrodes is the same as that in the new version of standard,
however, there are some changes in the technical requirements. Reserve 5
electrode models, and the corresponding changed models are put into the
brackets according to the provisions of new version of standard: E5015-E
(E5015-N1), E5016-E (E5016-N1), E5515-E (-40°C) (E5515-N1), E5516-E
(E5516-N1), E5515-E (-50°C) (E5515-N3). Add totally 23 electrode models,
including E4318, E5516-G, E5518-G (-30°C), E5018-G (-40°C), E5518-G (-
40°C), E5018-1, E5015-G, E5016-G, E5015-N2, E5515-N2, E5018-N2, E5516-
N3, E5518-N3, E5515- N5, E5516-N5, E5518-N5, E5015-G (-70°C), E5015-N5,
E5016-N5, E5018-N5, E5015-N7, E5016-N7, and E5018-N7.
--- Reserve 5 electrode models in the electrodes for creep-resisting steels, and the
Technical Permission of Welding Materials for
Pressure Equipment Section 2: Electrodes for Steel
1 Scope
This Part of NB/T 47018-2017 specifies the technical requirements, deposited metal
bending test and product marking for the steel electrodes.
This Part is applicable to the electrodes for non-alloy and fine-grain steels, electrodes
for creep-resisting steels, electrodes for high-strength steel, and stainless-steel
electrodes used for the pressure equipment.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) is applicable to this document.
GB/T 983-1995 Stainless Steel Covered Electrodes
GB/T 983 Stainless Steel Covered Electrodes
GB/T 2653 Methods of Bend and Compression Tests for Welded Joint
GB/T 3965 Methods for Determination of Diffusible Hydrogen in Deposited Metal
GB/T 5117-1995 Carbon Steel Covered Electrodes
GB/T 5117 Covered Electrodes or Manual Metal Arc Welding of Non-Alloy and
Fine Grain Steels
GB/T 5118-1995 Low Alloy Steel Covered Electrodes
GB/T 5118 Covered Electrodes for Manual Metal Arc Welding of Creep-Resisting
Steels
GB/T 32533 Covered Electrodes for Manual Metal Arc Welding of High-Strength
Steels
NB/T 47013.2 Non-Destructive Testing of Pressure Equipment - Part 2:
Radiographic Testing
NB/T 47014 Welding Procedure Qualification for Pressure Equipment
NB/T 47018.1 Technical Permission of Welding Materials for Pressure Equipment
- Section 1: General Rule
3 Technical Requirements
3.1 General rules
In addition to the provisions of GB/T 983, GB/T 5117, GB/T 5118 and GB/T 32533, the
steel electrodes for pressure equipment shall also comply with the provisions of NB/T
47018.1 and this Part.
Refer to Appendix A for the correspondence between the electrode models in this Part
and the models in and other related standards.
3.2 The eccentricity of the electrode
3.2.1 The eccentricity of electrode with a diameter no greater than 2.5mm shall be no
greater than 5%; however, the eccentricity of 5% inspected electrodes is allowed to be
greater than 5% and no greater than 7%.
3.2.2 The eccentricity of electrode with diameters of 3.2mm and 4.0mm shall be no
greater than 4%; however, the eccentricity of 5% inspected electrodes is allowed to be
greater than 4% and no greater than 5%.
3.2.3 The eccentricity of electrode with a diameter of no less than 5.0mm shall be no
greater than 3%; however, the eccentricity of 5% inspected electrodes is allowed to be
greater than 3% and no greater than 4%.
3.3 Chemical composition of deposited metal
The sulfur and phosphorus contents of the deposited metal of commonly used steel
electrodes for pressure equipment is shown in Table 1.
......
 
(Above excerpt was released on 2022-01-06, modified on 2022-01-06, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/NBT47018.2-2017