A kind of hard austenitic stainless steel for conveyor belt and its manufacturing method and application

Abstract

The invention provides a hard austenitic stainless steel for a conveyor and a manufacturing method and application thereof. The chemical compositions of the austenitic stainless steel comprises, by mass, 0.07%-0.10% of C, 1.0% or the less of Si, 2.0% or the less of Mn, 16.5%-17.5% of Cr, 6.5%-7.0% of Ni, 0.02%-0.04% of N, 0.4%-0.6% of V, 0.040% or the less of P, 0.01% or the less of S and the balance Fe and inevitable impurities. On the basis of the chemical compositions of common 301 stainless steel, a small quantity of V is added, the proportion of alloy components is optimized, and especially it is guaranteed that Nieq is 18.9-21, so that the fluctuation range of performance after same quenching-tempering and cold rolling process is reduced; and the total reduction ratio of quenching-tempering and cold rolling is reduced, the reduction ratio of single pass of cold rolling is reduced, and the condition is provided for improving of plate cut.

Description

technical field [0001] The invention relates to a hard austenitic stainless steel, in particular to a hard austenitic stainless steel for conveyor belts and a manufacturing method thereof. Background technique [0002] Stainless steel belts used in the manufacture of conveyor belts in the chemical industry, embossed plates and food industries require better corrosion resistance to improve service life, higher yield strength (yield strength greater than 930MPa) and suitable hardness range (HRC is 35 to 42 ) to avoid deformation during impact, and a good plate shape to ensure the shape of the conveyed product. In order to reduce the number of longitudinal welding passes, the width of the steel strip is expected to be greater than 1500mm. By entering keywords hard and austenitic stainless steel, the retrieval results shown in Table 1 appear. Patent CN201210050809.6 discloses a non-magnetic hard state nickel-saving austenitic stainless steel and its manufacturing method. The au...

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Problems solved by technology

Although the above two patents can meet the dual requirements for strength and hardness of hardened steel for conveyor belts, there are three significant problems: ①The performance fluctuates greatly, and the performance fluctuation after the same cold rolling reduction is relatively large due to the fluctuation of chemical composition. Large, for 301, the change range of yield strength after two passes of 30% cold rolling reduction is 750MPa~1400MPa, for 304, the change of yield strength after three passes of 42~45% cold rolling reduction The range is 860MPa~1278MPa

② There is a large difference in vertical and horizontal properties. After 30% cold rolling reduction, the vertical and horizontal performance difference can reach more than 180MPa, and after 42% cold rolling reduction, the vertical and horizontal performance difference is more than 225MPa.

③The plate shape is not easy to control, and the excessive reduction in a single pass is likely to produce wave patterns, such as figure 1 shown

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