231results about "Bell type furnaces" patented technology

The invention discloses TRIP (Transformation-Induced Plasticity) steel with low carbon content and high manganese content and a production method thereof, belonging to the technical field of steel products. The TRIP steel is the steel with the low carbon content and the high manganese content. The production method of the TRIP steel comprises the steps of smelting, thermal and continuous rolling, acid-washing in a push-pull manner, cold rolling, annealing in a cover manner and flattening. The yield strength of the TRIP steel is 400-900 MPa. The tensile strength of the TRIP steel is 1000-1500 MPa. The bake hardening value of the TRIP steel is 30-70 MPa. The TRIP steel can be applied to automobile components, and therefore, the TRIP steel has good application prospect in the respects of reducing the weight of an automobile and increasing the safety.

The invention discloses 700MPa-grade cold rolled steel plate with high weather resistance and a preparation method thereof. In the invention, a thin plate black continuous casting and continuous rolling flow is adopted. The refined molten steel mainly comprises the following chemical components: 0.03 to 0.07 weight percent of C, less than or equal to 0.35 weight percent of Si, 0.4 to 1.8 weight percent of Mn, less than or equal to 0.020 weight percent of P, less than or equal to 0.010 weight percent of S, 0.25 to 0.50 weight percent of Cu, 0.25 to 0.80 weight percent of Cr, 0.05 to 0.30 weight percent of Ni, 0.06 to 0.20 weight percent of Ti, and the balance of Fe and inevitable impurities. In an annealing process, steel is annealed in a cover annealing furnace at the temperature of 500 DEG C to an A1 transition point. The yield strength of the cold rolled steel plate with high weather resistance exceeds 700MPa, and the elongation rate is over 5 percent, and the cold rolled steel plate has high machinability and high weather resistance.

A process for avoiding the bonding of cold rolling strip steel and a hood-type annealing furnace without bonding belong to the heat treatment field. The invention provides a process for avoiding the bonding of cold rolling strip steel aiming at the problem of strip steel bonding existing in the process that the hood-type annealing furnace is annealed for strip coils, controls the cooling speed of the strip coils from the inner ring of strip coils and the middle portion of strip coils to the outer ring of strip coils in turn. Simultaneously the invention provides a hood-type annealing furnace without bonding, which comprises a hood body which is fixed on the furnace platform, wherein a cooling system is axially arranged in the hood body, and the cooling system is fixed on the furnace platform. The phenomenon of bonding can be avoided through cooling down steel rings through the process of the invention, and the situation of waste product caused by the bonding of experimental steel ring is completely overcome. Simultaneously the purpose of non bonding can be well realized through placing steel ring into the hood-type annealing furnace of the invention, and the improvement on the original hood-type furnace can be carried out, therefore the process has the advantages of excellent benefits, favorable effect, less investment and expansive market prospect, and is beneficial for application and popularization.