Core rod graphite lubricant

Abstract

The invention provides a graphite lubricant for a mandrel. The compositions by weight percentage of the lubricant are: 50 to 60 percent of graphite (with the granularity of between 200 and 300 meshes), an adhesive (namely a B-type (COB-B) composite adhesive) and an auxiliary additive which are mixed. The graphite lubricant for the mandrel has the advantages that the graphite lubricant improves the service life of the mandrel, has certain lubricity, can generate a corresponding solid lubricant film on the surface of the mandrel, has high temperature resistance, can resist high contact pressure, and has sufficient lubricating and load capacity. When the graphite lubricant is used as a lubricant for the mandrel to prepare Cr alloy steel through rolling, the surface of the mandrel is protected; the mandrel is protected because each mandrel can still be used after rolling 200 to 300 13Cr alloy tubes; and the quality of inner surfaces of the steel tubes is improved. The graphite lubricant for the mandrel improves the lubricating effect of the mandrel, reduces the equipment vibration during the rolling process, avoids the damage due to locking of five rods of a clamping head of the mandrel by a limit mechanism, and prolongs the replacement cycle of equipment.

Description

technical field [0001] The invention relates to a lubricant, in particular to a mandrel graphite lubricant. Background technique [0002] Generally, the pipes for the production of steel pipes are mainly used for oil and natural gas exploration, power station construction and maintenance, etc. However, as the earth's shallow oil and natural gas resources are becoming less and less, the exploitation of oil and natural gas wells continues to deepen, and the technical performance of steel pipes used for oil is increasingly demanding, so high-alloy casings and oil pipes are used commonly used. At the same time, my country is now vigorously developing large-scale power stations, and the pipes used need to meet the requirements of ultra-high pressure and ultra-high temperature, and the demand for high-pressure boiler tubes containing alloys such as Cr and Ni is also increasing. In order to meet the needs of the market, the development and production of high value-added products ...

AI Technical Summary

Problems solved by technology

However, when rolling high-alloy steel pipes of the above varieties, generally domestic graphite cannot meet the requirements for mandrel lubrication. When rolling less than 30 to 50 steel pipes, the surface of the mandrel will be seriously damaged, seriously affecting the steel pipe. Internal surface quality

[0005] 2. High equipment load: Steel pipe production adopts a limited-movement mandrel rolling process, and the speed of the steel pipe remains unchanged during the rolling process of the continuous rolling mill. This process needs to be completed by a stop mechanism that grasps the tail handle of the mandrel.

When rolling high-alloy steel pipes, the detent torque increases significantly, and the detent mechanism will generate large vibration noise

For example, rolling alloy pipes will cause frequent damage to the five connecting rods of the clamping head. Sometimes the clamping head needs to be replaced once a week, and the replacement is frequent.

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