Nitriding iron container base plate without surface defects and production method

Abstract

A nitriding iron container base plate without surface defects comprises, by weight percent, 0.010%-0.020% of C, 0.10%-0.50% of Mn, smaller than or equal to 0.030% of Si, smaller than or equal to 0.02% of P, smaller than or equal to 0.01% of S, 0.02%-0.06% of Als, smaller than or equal to 0.0035% of N, 0.20%-0.50% of Mo, 0.01%-0.05% of Ti or 0.01%-0.05% of Nb or 0.01%-0.05% of V or composition of two or more of the elements including the Ti, the Nb and the V. A production method comprises the preparing steps of molten iron pretreatment, converter smelting, continuous casting blank forming, cast blank heating, hot rolling, reeling, conventional acid pickling, cold rolling, annealing, finishing and standby usage. After nitriding of a steel plate, the phenomena of surface strip-shaped defects and bubbling are avoided, and excellent forming performance is achieved as well; and compared with a DC01 steel plate, only a small number of alloys containing Mo, Ti, Nb or V are added, and the production cost is low.

Description

technical field [0001] The invention relates to a nitriding iron container substrate and a production method, in particular to a nitriding iron container substrate with no surface defects and a production method. Background technique [0002] Iron containers are widely used in industry and daily life. Steel plates are stamped into containers, and then surface treated such as nitriding, carburizing or surface treatment to obtain good performance. At present, the substrates of iron containers for nitriding are mainly low-carbon steel plates, such as DC01 steel plates. ≤0.045%, Als ≥0.02%. Iron containers made of this steel, due to the wide range of chemical composition of the steel plate, high content of inclusions in the steel, coarse grains and poor uniformity, make the steel plate prone to a large number of strip defects after nitriding (that is, " Exploding strips") and blistering problems, when the surface defects are serious, the failure rate reaches more than 50%. ...

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Problems solved by technology

[0004] The Chinese patent application number is CN201510580302.5, which discloses a kind of "a kind of brittle 38CrMoAl nitrided steel with low nitriding layer", whose components are: C 0.35-0.42%; Si 0.20-0.45%; 0.60%; Cr1.35~1.65%; Mo 0.15~0.25%; Al 0.70~1.10%; P≤0.015%; S≤0.010%; V 0.001~0.01%; N 0.0020~0.006%; O 0.0005~0.0025%, its disadvantages: the steel has high carbon content and high strength, and is mainly used for structural parts, and cannot be used for stamping to manufacture thin-walled iron containers. high, expensive

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