GB/T 12470-2018 in English

《GB/T 12470-2018埋弧焊用热强钢实心焊丝、药芯焊丝和焊丝-焊剂组合分类要求》由TC55（全国焊接标准化技术委员会）归口，TC55SC1（全国焊接标准化技术委员会焊接材料分会）执行，主管部门为国家标准化管理委员会。

Solid wire electrodes, tubular cored electrodes and electrode/flux combinations for submerged arc welding of creep-resisting steels

1 Scope

This standard specifies the classification, technical requirements, test methods, re-inspection and supply technical conditions for solid wire electrodes, tubular cored electrodes and electrode/flux combinations for submerged arc welding of creep-resisting steels.

This standard is applicable to the classification requirements of solid wire electrodes, tubular cored electrodes and electrode/flux combinations for submerged arc welding of creep-resisting steels.

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 (including any amendment) applies.

GB/T 2650 Method of impact test for welded joint(GB/T 2650-2008, ISO 9016:2001, 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 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 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

Solid wire electrode models are classified according to chemical composition, in which the letter "SU" indicates a solid wire electrode for submerged arc welding, and the combination of numbers and letters after "SU" indicates its chemical composition classification. Please refer to Annex A for model/designation comparison between different standards on solid wire electrode.

Examples of solid wire electrode model in this standard are as follows:

Example 1:



3.2 Classification of electrode/flux combinations

3.2.1 Solid wire electrode/flux combinations are classified according to mechanical properties, flux type and electrode model.

3.2.2 Tubular cored electrode/flux combinations are classified according to mechanical properties, flux type and chemical composition of metal deposit.

3.2.3 The classification of electrode and flux combinations consists of five parts:

1) Part I: Use the letter "S" to represent the electrode/flux combinations for submerged arc welding;

2) Part II: Indicate the code for tensile strength of metal deposit under post-weld heat treatment, as shown in Table 1;

3) Part III: Indicate the code for test temperature when the impact energy (KV2) is not less than 27J, as shown in Table 2;

4) Part IV: Indicate the flux type code, as shown in Annex B;

Foreword i
1 Scope
2 Normative references
3 Classification
4 Technical requirements
5 Test methods
6 Re-inspection
7 Technical conditions for supply
Annex A (Informative) Model/designation comparison of solid wire electrodes
Annex B (Informative) Flux type