With the rapid development of petrochemicals, medical equipment, food machinery, and the atomic energy industry, stainless steel production in both varieties have a larger growth. In 1995, stainless steel production has been the extraordinary development of the Western developed countries. Stainless steel production has been close to 3% of the crude steel production (of 0.3%). Manufacturing costs lower than in 1980, more than 50%, S31803 and 329 austenitic / ferritic duplex stainless steel scale production in 1987, this type of high-performance low-nickel stainless steel has been confirmed may gradually replace 316 stainless steel such as impurities such as nitrogen, hydrogen sulfide environment better materials, and also to develop a variety of Welding Rod supporting worthy cause of concern.

1, duplex stainless steel electrode, duplex stainless steel is the microstructure of 50% F 50% A state of equilibrium for a class of stainless steel, duplex structure, which both austenitic stainless steels and ferritic stainless steel characteristics, compared with the ferritic stainless steel, duplex stainless steel high toughness, low-brittle transition temperature, resistance to intergranular corrosion and welding performance are significantly improved, while retaining some of the characteristics of ferritic stainless steel, such as 475 ℃ brittleness high thermal conductivity, superplasticity and magnetic compared to austenitic steels, duplex stainless steel, high strength, resistance to intergranular corrosion, stress corrosion resistance can significantly improve the duplex stainless steel excellent cost performance stainless steel.

The characteristics of such steel is: chromium 22-25%, 5-7% nickel, less than 304,316 austenitic stainless steel horizontal, add a certain amount of molybdenum, and a small amount of nitrogen, and some also added copper and tungsten . Evaluation of duplex stainless steel in chloride environment, the ability to resist pitting, pitting resistance equivalent (the PRE)

PRE =% Cr +3.3 ×% Mo +16 ×% N

General PRE25-43, the PRE over 40 usually referred to as super duplex steel. Now at home and abroad have come up with all kinds of duplex stainless steel electrode, such as the British Man Chete (METRODE) duplex stainless steel varieties of 10 kinds, including standard dual-phase steel electrode, Li Yang Welding Electrode dedicated duplex, super duplex steel electrode steel electrodes. The domestic Central Iron and Steel Research Institute Aetna Technologies AG research the four duplex stainless steel electrode, and The Beijing Jinwei and Sichuan Atlantic also developed a 2209 duplex stainless steel electrode.

2, the development of new boiler with stainless steel electrode.

In order to further improve the boiler with stainless steel tube of high temperature creep strength, high temperature corrosion characteristics and resistance to steam oxidation resistance, Japanese existing of SA213-TP304H and TP310H two austenitic steels improved to develop a good overall performance of the supercritical ultra supercritical boiler with a new stainless steel pipe material Super 304H stainless steel and supporting electrode.

3, generic steel grades stainless steel electrode seriation and specialization.

For the commonly used industrial stainless steel species, such as the 304,316 type. Abroad to consider the needs of the welding process, the development of a variety of special electrodes are the the AVESTA company dedicated welded pipe 308L/MVR-PW electrode, vertical down welding 308L/MVR-VDX electrode and medical devices for food use in particular small splash in Japan grease the EX series electrodes.

In addition, with the development of stainless steel metallurgical industry abroad has also developed a stainless steel electrode with a variety of performance industrial hand to meet all the needs. Such as Nippon Oil and Fats (TASETO) In addition to the generic 308,308 L electrodes commonly used 308-type electrode, also developed the 308HL electrodes improve high temperature performance for 308LA electrode temperature control different carbon content in order to improve its corrosion resistance The 308L3, 308L2 electrode. Japan dissolved successor company apart from the above varieties, developed with certain nitrogen content, in order to improve weld strength WEL308N2, WEL316LN, such as nitrogen-containing stainless steel welding rod, foreign manufacturers are also committed to the development of special stainless steel electrode, in order to meet the special needs , welcomed by users.