Corrosion-resistant steel with 700 MPa yield strength for coal transporting gondola car and manufacturing method of corrosion-resistant steel

Abstract

The invention discloses corrosion-resistant steel with the 700 MPa yield strength for a coal transporting gondola car and a manufacturing method of corrosion-resistant steel. The steel contains 0.055-0.079% of C, 0.21- 0.29% of Si, 1.41-1.69% of Mn, no more than 0.018% of P, no more than 0.006% of S, 0.015-0.045% of Als, 0.51-0.99% of Cr, 0.11-0.19% of Ni, 0.29-0.46% of Cu, 0.041-0.062% of Nb, 0.017-0.042% of Ti, 0.051-0.119 % of Sb, 0.037-0.089% of Sn, 0.11-0.19% of Mo, 0.0008-0.0019% of B, 0.0008-0.0030% of Ca, and the balance iron and unavoidable impurities. A 135-170 mm slab is heated to 1228-1249 DEG C, the rough rolling temperature is greater than 1100 DEG C, the fine and starting rolling temperature is 1000-1100 DEG C, the final rolling temperature is 830-895 DEG C, the coiling temperature is 580-650 DEG C, and the steel plate resistance to sulfuric acid and chloride ion corrosion performance are excellent.

Description

technical field [0001] The invention belongs to the field of steel for railway vehicles, and relates to a corrosion-resistant steel suitable for use in a corrosion environment containing acidic medium and chloride ions and a manufacturing method thereof. Background technique [0002] Ordinary steel gondola cars are usually only subject to atmospheric corrosion, while coal transport gondola cars are attacked by a rather harsh corrosive environment. First of all, coal contains sulfides that have a strong chemical corrosion effect on steel; moreover, because water is used to shock coal during mining, the coal contains water, and when coal is transported in winter, certain salts must be added to prevent freezing. In order to lower the freezing point, this brings extremely corrosive chloride ions. [0003] At present, the manufacturing materials used for coal transport gondolas are aluminum alloy, stainless steel or traditional weathering steel. Although aluminum alloy and stai...

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Problems solved by technology

[0011] Aiming at the technical problems existing in the production of steel used in the current gondola for coal transportation, such as: the use of aluminum alloy and stainless steel is relatively expensive, the welding and formability are not good, and the corrosion resistance of the existing steel cannot meet the requirements, the invention is proposed. Technical solutions

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