CN-117066753-B - High-temperature-resistant submerged-arc wear-resistant flux-cored wire special for seamless pipe core rod

Abstract

The invention belongs to the technical field of flux-cored wires, and relates to a high-temperature-resistant submerged arc wear-resistant flux-cored wire special for a seamless pipe core rod. The drug core comprises, by mass, 16-30 parts of micro-carbon ferrochrome, 10-30 parts of metallic chromium, 1-3 parts of zircon sand, 5-12 parts of cobalt powder, 10-20 parts of nickel powder, 6-20 parts of molybdenum powder, 1-4 parts of rare earth ferrosilicon alloy, 2-6 parts of ferroniobium, 4-8 parts of low-carbon ferromanganese, 2-6 parts of ferrovanadium, 1-4 parts of ferrotitanium, 1.0-2.2 parts of chromium nitride, and the balance of atomized iron powder, wherein the filling ratio is 30-40%. The flux core of the invention replaces C with N, inhibits ferrite from forming, improves cold and hot fatigue resistance, forms stable nitrides with chromium, molybdenum, cobalt, vanadium and the like in alloy, is dispersed in deposited metal, improves high-temperature wear resistance, corrosion resistance and high-temperature hardness of welding materials, and obviously improves the number of penetrating pipes.

Inventors

• LI CHANGXIN
• ZHANG YIHAN

Assignees

• 济南法瑞钠焊接器材股份有限公司

Dates

Publication Date

20260512

Application Date

20230815

Claims (1)

1. 1. The high-temperature-resistant submerged arc wear-resistant flux-cored wire special for the seamless pipe core rod consists of a sheath and a flux core, and is characterized in that the flux core comprises, by mass, 26 parts of micro-carbon ferrochrome, 15 parts of metallic chromium, 1 part of zircon sand, 7 parts of cobalt powder, 18 parts of nickel powder, 11 parts of molybdenum powder, 2 parts of rare earth ferrosilicon alloy, 3 parts of ferroniobium, 7 parts of low-carbon ferromanganese, 5 parts of ferrovanadium, 2 parts of ferrotitanium, 1 part of chromium nitride, 2 parts of atomized iron powder and a filling ratio of 38+/-0.5%.

Description

High-temperature-resistant submerged-arc wear-resistant flux-cored wire special for seamless pipe core rod Technical Field The invention belongs to the technical field of flux-cored wires, and relates to a high-temperature-resistant submerged arc wear-resistant flux-cored wire special for a seamless pipe core rod. Background The mandrel is an important tool for fixing pipes and fixing walls, which are necessary for rolling seamless steel pipes, and is also a main consumption component in a continuous rolling pipe unit. The core rod has very bad working conditions in the service process, and is required to bear high-temperature heat generation caused by friction in the rolling process, high-temperature heat impact of more than 1200 ℃ and heat-cold circulation stimulation of cooling water, larger radial rolling force, and longitudinal tensile force and surface friction force generated by relative movement between the pipe blank and the core rod in the length rolling direction. Therefore, the mandrel bar is easily worn, cracked and bent during use, and once worn during use, the mandrel bar must be replaced in order to ensure the quality of the seamless tube and the safety of the rolling mill. More than 50% of the production and maintenance costs of the continuous rolling pipe unit equipment are consumed and scrapped for replacing the core rod, and the cost is extremely high. The replaced core rod can be reused only after the large specification is changed into the small specification or hard chromium is electroplated, and the surfacing repair is the most commonly used repair means at present. The existing wear-resistant welding wire for welding repair in the market mainly comprises solid 0Cr13Ni4Mo, has fewer types of flux-cored wires and is similar to the solid welding wire alloy series. The alloy wear-resistant welding wire has fewer through pipes, and the number of the through pipes is below 1200, for example, the diameter of the through pipes is 1000 mm. The reason is that the common wear-resistant welding wire has low high-temperature hardness, poor high-temperature wear resistance and poor hot cracking resistance, and the common wear-resistant welding wire is difficult to meet the requirement of surfacing maintenance and use of a core rod for continuous rolling pipe unit equipment. Therefore, the research on the wear-resistant flux-cored wire which has good high-temperature wear resistance and strong thermal cracking resistance and is specially suitable for repairing the seamless tube core rod and can obviously improve the number of the penetrating tubes is a technical problem to be solved. Disclosure of Invention The invention provides a novel high-temperature-resistant submerged arc abrasion-resistant flux-cored wire special for a seamless pipe core rod, aiming at the problems existing in the process of overlaying a core rod of equipment of a traditional continuous rolling pipe unit. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: the invention provides a special high-temperature-resistant submerged arc wear-resistant flux-cored wire for a seamless pipe core rod, and the number of penetrating pipes after repairing the core rod with the diameter of 1000mm by using the flux-cored wire can reach more than 2800. The flux-cored wire comprises, by mass, 16-30 parts of micro-carbon ferrochrome, 10-30 parts of metallic chromium, 1-3 parts of zircon sand, 5-12 parts of cobalt powder, 10-20 parts of nickel powder, 6-20 parts of molybdenum powder, 1-4 parts of rare earth ferrosilicon alloy, 2-6 parts of ferroniobium, 4-8 parts of low-carbon ferromanganese, 2-6 parts of ferrovanadium, 1-4 parts of ferrotitanium, 1.0-2.2 parts of chromium nitride, and the balance of atomized iron powder, wherein the filling ratio is 30-40%. The sheath adopts a low-carbon steel strip, the model HS1 (technical parameters are as follows: C is <0.04%, mn is 0.1-0.45%, si is <0.04%, S is < 0.02%, P is <0.022, yield strength is 140-180Mpa, tensile strength is 280-360 Mpa), thickness is 0.5-0.8mm, width is 14-16mm, the steel strip is used as an outer wrapping material of the welding wire, after deoiling and drying, the steel strip is rolled into a U-shaped groove through a roller, the uniformly mixed flux core is synchronously filled according to a certain filling coefficient of 30-40%, the steel strip is rolled into an O shape, and then a finished submerged arc abrasion-resistant flux-cored wire with the diameter of 2.4-4.0mm is manufactured through multiple drawing. Preferably, the flux core comprises, by mass, 16-26 parts of micro-carbon ferrochrome, 15-25 parts of metallic chromium, 1-3 parts of zircon sand, 7-11 parts of cobalt powder, 14-18 parts of nickel powder, 6-11 parts of molybdenum powder, 2-3 parts of rare earth ferrosilicon alloy, 2-5 parts of ferroniobium, 5-7 parts of low-carbon ferromanganese, 2-5 parts of ferrovanadium, 1.5-3 parts of ferrotitanium, 1-2 parts