T/P91 steel electrode and manufacturing method thereof

Abstract

The invention discloses a T/P91 steel electrode manufacturing method. An R40 welding wire is used as a core wire. Medical powder comprises, by weight percentage, marble 31-35, fluorite 26-29, titanium dioxide 4-7, quartz 1-2, mica 1-2, chromium metal 13-15, atomization nickel powder 1-2, ferrotitanium 7-9, ferromolybdenum 1-2, ferroniobium 0.5-1, ferrovanadium 1-2, and vanadium-nitrogen alloy 1-2. After the powder is mixed in a drying mode, water glass is added according to a ratio of 3:1 and is mixed with the powder in a wet mode, and suppression is carried out after uniform stirring is carried out. Electrode coating weight coefficient is controlled to be 0.95-1.0, cracking of a coating after being dried is avoided, the compression environmental temperature is over 20 DEG C, the products are placed into a drying box after being dried for 3 hours, and is dried for 2 hours when temperature is 100 DEG C, 125 DEG C per hour is risen into 450 DEG C, and then furnace cooling of the products is carried out after being warmed for two hours. The steel electrode is good in welding process performance, little in splatter, low in smoke amount, and attractive in appearance of weld. All the performances can reach foreign imported similar steel electrode technological level. Production cost is greatly reduced.

Description

Technical field: [0001] The invention relates to a T / P91 steel welding rod and a manufacturing method thereof, which are suitable for welding T / P91 steel in chemical industry and power plant boilers. Background technique: [0002] Since the mid-1990s, imported or domestic thermal power units put into production in China have successively adopted T / P91 steel pipes, but so far, almost all of their welding materials have been imported, and the price is expensive. Although there are a few domestic units that can produce T / P91 P91 steel electrode, but its products all use steel core transition, because the welding core has more alloy elements and higher resistivity, it is easy to cause redness and cracking of the coating during welding, and the welding process is poor. The high content of alloy elements in T / P91 steel will increase the thickness of the coating of the electrode, which will easily cause uneven transition of alloy elements. The above problems can be better solved by...

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Problems solved by technology

[0002] Since the mid-1990s, imported or domestic thermal power units put into production in China have successively adopted T / P91 steel pipes, but so far, almost all of their welding materials have been imported, and the price is expensive. Although there are a few domestic units that can produce T / P91 P91 steel electrode, but its products all use steel core transition, because the welding core has more alloy elements and higher resistivity, it is easy to cause redness and cracking of the coating during welding, and the welding process is poor. The high content of alloy elements in T / P91 steel will increase the thickness of the coating of the electrode, which will easily cause uneven transition of alloy elements. The above problems can be better solved by using the mixed transition form of the coating and the steel core, but the focus is on the coating of the electrode. Skin recipe design

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