Metallurgical equipment quality appraisal

Metallurgical equipment refers to various mechanical equipment used in the metallurgical production process, mainly used for smelting, rolling, forging, extrusion and other processes.
The process of metallurgical equipment is complex and requires a high degree of continuity, mechanization and automation. These equipment are usually heavy and bulky, highly complete, consume high energy, and often work in high temperature, heavy load, dusty and corrosive environments. Therefore, understanding the construction and working principles of metallurgical equipment is crucial to understanding its function and performance. Mastery of the basic theories of metallurgical equipment and the selection of main components and materials are also crucial to the optimal operation and problem solving of the equipment.
In metallurgical equipment quality appraisal cases, Zhongke Testing can provide metallurgical equipment quality appraisal services.

Metallurgical machinery is mainly divided into four categories according to the production process: smelting equipment, continuous casting equipment, rolling (calendering) equipment and post-finishing equipment.
1. Smelting equipment mainly includes blast furnaces, converters, electric furnaces, as well as sintering, pelletizing and coke oven machinery that provide artificial rich ores and metallurgical coke for blast furnaces, molten iron pretreatment and molten steel refining equipment outside the furnace for pure steel production.
2, continuous casting equipment mainly includes complete sets of continuous casting equipment for slabs, billets, tube blanks, and special-shaped billets.
3, rolling (calendering) equipment mainly includes various types of cold rolling mills and hot rolling mill complete sets of equipment for plates, pipes, profiles and wire rods.
4, post-finishing equipment mainly includes complete sets of post-processing and deep processing equipment for various rolled materials, such as complete sets of longitudinal and transverse shearing line equipment, continuous pickling units, continuous annealing units, complete sets of coating and composite material production equipment such as hot-dip galvanizing, electro-galvanizing, electro-tin plating, organic coatings, and wire drawing and rope making equipment.

GB/T 35981-2018 Metallurgical equipment, welding lifting lugs Technical specifications
GB/T 38392-2019 Metallurgical equipment, couplings, test methods, inspection rules and acceptance specifications
GB/T 37009-2018 Frequency conversion speed regulation equipment for metallurgy 2018
YB/T 4629-2017 Oil Change Guide for Hydraulic Oil for Metallurgical Equipment L-HM Hydraulic Oil
JB 2162-1991 Types and Dimensions of Hydraulic Cylinders for Metallurgical Equipment
JB/T 12046-2014 Metallurgical Equipment Coupling Flange Embedded Connection Basic Parameters and Dimensions
JB/T 12045-2014 Metallurgical equipment coupling, flange end tooth connection, basic parameters and dimensions
YB/T 087-2009 Slewing bearing for metallurgical equipment
YB/T 4341-2013 Metallurgical equipment electromagnetic reciprocating drive device
JB/T 11061-2010 ZT type circumferential elastic coupling
0JB/T for metallurgical equipment 10650-2006 Split rolling bearing with seat
1YB/T for metallurgical equipment 4342-2013 Electromagnetic reciprocating drive device for metallurgical equipment
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A set of metallurgical equipment purchased by a steel company included a primary cylindrical mixer, a secondary cylindrical mixer, a single-roller crusher, and a four-roller crusher. After trial operation, it was found that the set of equipment did not meet the technical requirements agreed upon in the agreement, and a dispute arose with the equipment manufacturer.
was entrusted by the court to conduct appraisal and analysis on "whether there are quality problems" in the metallurgical equipment involved.
appraisal analysis results:
appraisal analysis expert group discussed the relevant information and on-site investigation of the metallurgical equipment involved and made a comprehensive quality and technical analysis, and made the following suggestions and conclusions:
(1) Cylindrical mixer: The gear tooth base plate of the secondary mixer has a crack, which does not meet the specification requirements.
(2) Single roller crusher spare parts: One gear tooth is broken, which does not meet the specifications and the requirements of the "Letter of Commitment" signed by both parties.
(3) Mixer roller:
1. During the long-term rolling process of the roller, the shear yield strength of the material on the contact surface is reduced under the action of shear stress, and plastic deformation and deformation strengthening occur at the contact surface. Gradual accumulation will cause cracks on the surface.
2. Equipment structure, in which the oil method does not reserve a separate oil hole (refueling hole). In addition, the lubricating oil added during the operation of the equipment is stored without a cover (storage in a container without a cover) and has not been filtered and circulated. The rough refueling method intensifies the speed of cracks on the contact surface, resulting in large areas of peeling and needle-shaped bean-shaped pits on the surface of the supporting wheel.