Rubber composition for tire bead ring

The invention relates to the technical field of rubber, in particular to a rubber composition for a tire bead ring. The rubber composition is characterized by being prepared from the following raw materials in parts by weight through mixing: 0-40 parts of natural rubber, 60-100 parts of butadiene styrene rubber, 5-40 parts of high styrene resin, 60-120 parts of carbon black, 0-15 parts of reinforcing phenolic resin, 3.0-5.0 parts of zinc oxide, 1.0-3.0 parts of stearic acid, 5-15 parts of tackifying resin, 0.5-1.5 parts of protecting wax, 15-25 parts of sulphur powder, 10-25 parts of softening oil, 0.8-1.5 parts of an accelerant DM and 0.1-0.2 part of an accelerant DPG. According to the rubber composition, under the condition that the structure of the tire bead ring keeps unchanged, the adhesive force of the bead ring modulus and coating is improved, and the problems of tire wiredrawing explosion, bead hollowness and bead break are solved.

Electric furnace smelting method for high-grade pipe line steel

Steel plate with low welding crack sensitivity and production method thereof

The invention discloses a low-welding crack sensitivity steel board and manufacturing method, which comprises the following parts: not more than 0.07% C, 0.15-0.40% Si, 1.00-1.60% Mn, not more than 0.015% P, not more than 0.010% S, not more than 0.30% Cu, not more than 0.50% Ni, not more than 0.30% Cr, not more than 0.30% Mo, not more than 0.08% V, not more than 0.08% Nb, 0.010-0.020% Ti, not more than 0.003% B, Fe and inevitable impurity. The invention is characterized by the following: (1)displaying lower welding crack sensitivity component with Pcm not more than 0.20%; (2)mating the strength and flexibility reasonably with fitful yielding ratio; (3)making the price and property of the steel board superior to the congeneric import product; (4)making the maximum breadth of steel board to 4000mm; (5)simplifying the technique to ensure higher flatness without quenching water.

Pressure retention and temperature varying nitrogen vulcanization method for tire

The invention relates to a pressure retention and temperature varying nitrogen vulcanization method for a tire, and belongs to the field of tire production. The pressure retention and temperature varying nitrogen vulcanization method comprises the technical steps of feeding a high-temperature steam medium into a tire capsule, quickly heating the interior of the capsule for about 8-10 minutes, then feeding a high-pressure nitrogen medium, performing pressure retention after the pressure in the capsule reaches a standard value range, and performing pressure release, vacuumizing and die opening after the pressure retention is ended. According to the pressure retention and temperature varying nitrogen vulcanization method for the tire, in a tire vulcanization process, under a condition of insufficient high-temperature steam medium, the total sub-temperature time is automatically calculated by a programmable logic controller (PLC) program, delaying vulcanization is automatically executed within ...

Electric furnace smelting method for high-grade pipe line steel

The invention relates to a electric furnace smelting method of the high-grade pipe line steel, which comprises the following steps: proportioning 60%-70% hot iron, 5%-10% iron, 15%-30% scrap steel and 5%-20% sponge iron; smelting the proportioned material in the electric stove( the smelting cycle is 45-55minutes); decarbonizing with the vacuum natural oxygen; proceeding with the reaction of the surplus oxygen content in the steel and the carton in the steel in the vacuum state after the electric stove discharges the steel; refining slag in the LF finer( the alkalinity of the refining slag is controlled at 2.5-3.5, the binary alkalinity is controlled at 5-7); deoxidizing with deoxidizer; controlling the argon gas flow at 300L/min; adding the electrolytic manganesium or the like in 20 minutes; completing 90% desulfuration in the good deoxidization condition when the temperature reaches about 1600Deg. C; adding the slight ferro-silicon powder and lime at the late refining when the argon gas ...