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

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NB/T 47018.2-2017: Technical permission of welding materials for pressure equipment. Section 2: Electrodes for steel
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.