This standard is drafted in accordance with the rules given in the GB/T 1.1-2009.
This standard replaces GB/T 5293-1999 Carbon Steel Electrodes and Fluxs for Submerged Arc Welding. The following main changes have been made with respect to GB/T 5293-1999 (the previous edition):
— standard name is changed to Solid Wire Electrodes, Tubular Cored Electrodes and Electrode/Flux Combinations for Submerged Arc Welding of Non Alloy and Fine Grain Steels;
— addition of the requirements for classification of tubular cored electrodes-flux combinations in accordance with ISO 14171:2016;
— addition of the corresponding technical requirements for double-sided single-pass welding in accordance with ISO 14171:2016;
— adjustment of the classification method and mechanical property requirements in accordance with ISO 14171:2016;
— deletion of the technical requirements for flux, and relevant contents are adjusted to GB/T 36037 Fluxes for Submerged Arc Welding and Electroslag Welding.
— retain 9 welding wire designations in the original standard, the metallurgical designation classification and chemical composition requirements are adjusted according to GB/T 3429-2015 Wire Rods for Welding, and the wire symbols are compiled respectively;
— addition of 44 symbols for welding wires in accordance with ISO 14171:2016. According to domestic usage habits of China, metallurgical designations have been classified according to GB/T 221-2008 Notations for Designation of Iron and Steel.
— according to the tensile strength range specified in this standard, addition of the technical requirements of 3 welding wire designations of H10Mn2A, H08MnMoA and H08Mn2MoA in GB/T 12470-2003 Low-alloy Steel Electrodes and Fluxes for Submerged Arc Welding; and according to GB/T 3429-2015, the classification of its metallurgical designations are changed to H13Mn2, H08MnMo and H08Mn2Mo, respectively, and the symbols are compiled as SU43, SUM3 and SUM31 respectively;
— according to the domestic use requirements of China, addition of the technical requirements of 4 designations of H10MnSi, H10Mn2Ni, H11Mn2Mo and H08MnCrNiCu in GB/T 3429-2015, and the symbols are compiled as SU28, SU35, SU4M32 and SUN1C1C respectively.
This standard has been redrafted and modified adoption of International Standard ISO 14171:2016 Welding Consumables — Solid Wire Electrodes, Tubular Cored Electrodes and Electrode/Flux Combinations for Submerged Arc Welding of Non Alloy and Fine Grain Steels — Classification (English version).
This standard has structural adjustments with respect to the ISO 14171:2016, and is compiled according to classification, technical requirements, test methods, re-inspection and technical conditions of supply.
The technical deviations between this standard and the International Standard ISO 14171:2016, together with their justifications, are given below:
— adjustment of technical difference are made for the normative references in this standard so as to adapt to the technical conditions in China. The adjustment conditions are mainly reflected in Clause 2 Normative References; see below for specific adjustments:
? addition of references GB/T 2650, GB/T 2651 GB/T 2652 and GB/T 3323;
? ISO 6847 and ISO 13916 are replaced by GB/T 25777 and GB/T 18591, which are identical with the international standards;
? ISO 3690, ISO 15792-1, ISO 15792-2, ISO 544 and ISO 14344 are replaced by GB/T 3965, GB/T 25774.1, GB/T 25774.2, GB/T 25775 and GB/T 25778, which are modified adoption of the international standards;
? deletion of ISO 80000-1:2009.
— addition of the corresponding metallurgical designations classification comparing with solid wire electrode symbols according to the actual application in China.
— addition of the technical requirements for solid wire electrode symbols SU08A, SU08E, SU08C, SU13, SU26, SU27, SU28, SU34, SU35, SU43, SU44, SU45, SUM3, SUM31, SU4M32 and SUN1C1C.
— retain the technical requirements of wire electrode size and surface quality specified in GB/T 5293-1999.
— retain the requirements of radiographic inspection specified in GB/T 5293-1999 to adapt to the technical requirements of China.
For the purposes of this standard, the following editorial changes have also been made:
— standard name is changed to Solid Wire Electrodes, Tubular Cored Electrodes and Electrode/Flux Combinations for Submerged Arc Welding of Non Alloy and Fine Grain Steels;
— addition of Annex A (Informative) Complete List of Solid Wire Electrode Designations and Symbols
— addition of Annex B (Informative) Welding Flux Types
This standard was proposed by and is under the jurisdiction of National Technical Committee on Welding of Standardization Administration of China (SAC/TC 55).
The previous editions of the standard replaced by this standard are as follows:
— GB/T 5293-1985, GB/T 5293-1999.
Solid Wire Electrodes, Tubular Cored Electrodes and Electrode/Flux Combinations for Submerged Arc Welding of Non Alloy and Fine Grain Steels
1 Scope
This standard specifies the classification, technical requirements, test methods, re-inspection and technical conditions of supply of solid wire electrodes, tubular cored electrodes electrodes and electrode/flux combinations for submerged arc welding of non-alloy and fine grain steels.
This standard is applicable to the classification of solid wire electrodes, and electrode/flux combinations for submerged arc welding of non-alloy and fine grain steels with a minimum tensile strength of up to 570 MPa.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2650 Impact Test Methods on Welded Joints (GB/T 2650-2008, ISO 9016:2001, IDT)
GB/T 2651 Tensile Test Methods on Welded Joints (GB/T 2651-2008, ISO 4136:2001, IDT)
GB/T 2652 Tensile Test Methods on Weld and Deposited Metal (GB/T 2652-2008, ISO 5178:2001, IDT)
GB/T 3323 Radiographic Examination of Fusion Welded Joints in Metallic Materials
GB/T 3965 Determination of Diffusible Hydrogen in Deposited Metal (GB/T 3965-2012, ISO 3690:2000, MOD)
GB/T 18591 Welding — Guidance on the Measurement of Preheating Temperature, Interpass Temperature and Preheat Maintenance Temperature (GB/T 18591-2001, idt ISO 13916:1996)
GB/T 25774.1 Test Methods for Welding Consumables — Part 1: Preparation and Testing of Deposited Metal Specimens for Mechanical Properties in Steel Nickel and Nickel Alloys (GB/T 25774.1-2010, ISO 15792-1:2000, MOD)
GB/T 25774.2 Test Methods for Welding Consumables — Part 2: Preparation of Single-run and Two-run Technique Test Specimens in Steel (GB/T 25774.2-2016, ISO 15792-2:2000, MOD)
GB/T 25775 Technical Delivery Conditions for Welding consumables — Type of product, Dimensions, Tolerances and Markings (GB/T 25775-2010, ISO 544:2003, MOD)
GB/T 25777 Preparation Methods of Deposited Metal Specimens for Chemical Analysis (GB/T 25777-2010, ISO 6847:2000, IDT)
GB/T 25778 Procurement Guidelines for Welding Consumables (GB/T 25778-2010, ISO 14344:2010, MOD)
3 Classification
3.1 Classification of solid wire electrode
The solid wire electrode shall be classified in accordance with its chemical composition. The letter "SU" indicates the submerged arc welding solid wire electrode, and the combination of numbers or numbers and letters after "SU" indicates the classification of chemical composition. See Annex A for a comparison of symbols/designations between different standards for solid wire electrode.
The examples of symbols of solid wire electrodes in this standard are as follows:
Example 1:
Indicates classification of chemical composition
Indicates solid wire electrode for submerged arc welding
3.2 Classification of electrode/flux combination
3.2.1 Solid wire electrode/flux combination classification is divided according to mechanical properties, post-weld state, flux type and wire electrode symbol.
3.2.2 Flux cored wire electrode/flux combination classification is divided according to mechanical properties, post-weld state, flux type and chemical composition of all-weld metal.
3.2.3 Wire electrode/flux combination classification consists of five parts:
1) Part 1: the wire electrode/flux combination of submerged arc welding is indicated by the letter "S";
2) Part 2: indicates the tensile strength code of the all-weld metal under the condition of welding or post-weld heat treatment, see Table 1A; or the tensile strength code of the welded joint for two-run welding, see Table 1B;
3) Part 3: the test temperature code when the impact energy (KV2) is not less than 27 J, see Table 2;
4) Part 4: indicates the flux type code, see Annex B;
5) Part 5: indicates the symbols of solid wire electrode, see Table 3; or the chemical composition of the all-weld metal of the tubular cored electrodes electrode-flux combination, see Table 4.
In addition to the above mandatory classification code, an optional code can be added to the combination classification:
a) the letter "U", appended to the Part 3, indicates that the impact energy absorption (KV2) shall not be less than 47 J at the specified test temperature;
b) diffusion hydrogen code "HX", appended to the last, where "X" may be the number 15, 10, 5, 4 or 2, respectively indicating the maximum value (mL) of diffusible hydrogen content per 100 g of all-weld metal, see Table 5.
The examples of classification of electrode/flux combination in this standard are as follows:
Example 2:
Indicates symbol of solid wire electrode
Indicates flux type
Indicates the impact energy (KV2) is not less than 27 J at the test temperature -40°C
Indicates the minimum tensile strength of the two-run welded joint is 550 MPa.
Indicates electrode/flux combination for submerged arc welding
Example 3:
Optional additional code, indicates that the diffused hydrogen content of the all-weld metal is not more than 5 mL/100 g
Indicates symbol of solid wire electrode
Indicates flux type
Indicates the impact energy (KV2) is not less than 47 J at the test temperature -20°C
Indicates that the minimum tensile strength of the multi-run all-weld metal in the as-welded state is 490 MPa
Indicates electrode/flux combination for submerged arc welding
?
Example 4:
Indicates chemical composition classification of tubular cored electrodes electrode/flux combination of all-weld metal
Indicates flux type
Indicates the impact energy (KV2) is not less than 47 J at the test temperature -80°C
Indicates that the minimum tensile strength of the multi-run all-weld metal in the as-welded state is 550 MPa
Indicates electrode/flux combination for submerged arc welding
Table 1A Symbols for Tensile Properties by Multi-run all-weld metals
Symbols of tensile strength a Tensile strength Rm
MPa Yield strength b ReL
MPa Elongation after fracture A
%
43X 430 to 600 ≥330 ≥20
49X 490 to 670 ≥390 ≥18
55X 550 to 740 ≥460 ≥17
57X 570 to 770 ≥490 ≥17
a X is “A” or “P”, where “A” indicates testing in the as-welded condition and “P” indicates testing in the post-weld heat-treated condition.
b For yield strength is not obvious, the specified plastic elongation strength, Rp0.2, is used.
Table 1B Symbols for Tensile Properties by Two-run Welded Joints
Symbol of tensile strength Tensile strength Rm
MPa
43S ≥430
49S ≥490
55S ≥550
57S ≥570
Table 2 Temperature Code of Impact Test
Temperature code of impact test Temperature for impact energy (KV2) not less than 27 J a
°C
Z No requirements
Y +20
0 0
2 -20
3 -30
4 -40
5 -50
Table 2 (continued)
Temperature code of impact test Temperature for impact energy (KV2) not less than 27 J a
°C
6 -60
7 -70
8 -80
9 -90
10 -100
a If the letter “U” is attached after the temperature code of impact test, the impact energy (KV2) shall not less than 47 J.
4 Technical Requirements
4.1 Wire electrode dimensions and surface quality
The dimensions and surface quality of wire electrodes shall meet the requirements of GB/T 25775.
4.2 Chemical composition
4.2.1 Chemical composition of solid wire electrodes
The chemical composition of solid wire electrodes shall comply with those specified in Table 3;
Foreword II
1 Scope
2 Normative References
3 Classification
4 Technical Requirements
5 Test Method
6 Re-inspection
7 Technical Conditions of Delivery
Annex A (Informative) Comparison of Solid Wire Electrode Symbol/Designation
Annex B (Informative) Welding Flux Types
