Manual electric arc welding welding rod used for ultralow-temperature high manganese steel

Abstract

The invention relates to a manual electric arc welding welding rod used for ultralow-temperature high manganese steel. According to the technical scheme, the manual electric arc welding welding rod is composed of a welding rod core and a coating; the welding rod core comprises the following chemical components of 0.75-0.95 wt% of C; 26-30 wt% of Mn; 4.5-6.5 wt% of Ni; 1.5-3.5 wt% of Cr; 3.5-5.5 wt% of Al; P less than or equal to 0.002 wt%; S less than or equal to 0.002 wt%; and the balance Fe and inevitable impurities, the coating comprises the following chemical components of 40-45 wt% of fluorite; 15-20 wt% of marble; 4-10 wt% of rutile; 3-6 wt% of zircon sand; 1-2 wt% of sodium carbonate; and the balance Fe powder; and a preparation method of the manual electric arc welding welding rod comprises the following steps of blending according to the chemical components of the coating, mixing, adding a binder, uniformly stirring, and pressing and coating on the surface of the welding rod core to prepare the manual electric arc welding welding rod used for the ultralow-temperature high manganese steel. The manual electric arc welding welding rod used for the ultralow-temperature high manganese steel is low in cost and simple in alloy system; and formed weld metal has the characteristics of ultralow temperature and high toughness, and the strength is matched with the strength of the ultralow-temperature high manganese steel.

Description

technical field [0001] The invention belongs to the technical field of manual electric welding electrodes. Specifically relates to a manual arc welding electrode for ultra-low temperature high manganese steel. Background technique [0002] Steel for storage and transportation containers such as liquefied natural gas (LNG) is usually stored at a low temperature of -196°C. The steel for commercial LNG storage tanks at this stage is 9Ni steel, because the steel plate with 9% nickel content is expensive. While requiring high safety for steel used as a key material for LNG storage and transportation, reducing construction costs and realizing the development of Ni-reduced steel plates has become an important development direction of low-temperature steel. For this reason, nickel-saving low-temperature steel has been developed successively at home and abroad. In recent years, in order to reduce the production cost of steel for LNG storage tanks and the dependence on high-priced ni...

AI Technical Summary

Problems solved by technology

Although the composition has been adjusted and the Mo element has been added, the red tail phenomenon is still serious. The deterioration of the operation process caused by the red tail, and the problems that ultimately affect the weld formation and mechanical properties still exist

At present, there is no public report on the related technology and welding rod products without welding tail red that match the ultra-low temperature high manganese steel