A deep-drawing sensor housing with a low earing rate cold-rolled austenitic stainless steel and a manufacturing method thereof

Abstract

The application provides a low-earring-rate deep-drawing sensor shell cold-rolled austenitic stainless steel and a manufacturing method thereof, and comprises the following steps: S1: hot-rolled black skin is subjected to a hot-rolled continuous fire pickling unit to obtain white skin raw material; S2: the white skin raw material obtained in step S1 is subjected to rolling of a twenty-roller single-stand reversible cold-rolling mill to obtain a hard-state plate; S3: the hard-state plate obtained in step S2 is subjected to intermediate-process annealing of a cold-rolling annealing process to obtain soft-state material with a grain size of 7.5-8; S4: the soft-state material obtained in step S3 is subjected to rolling to obtain hard-state material; and S5: the hard-state material is subjected to cold-rolling annealing and pickling to obtain material with a grain size of 8. The application has the beneficial effects of greatly reducing the wear of a mold, improving production efficiency and avoiding material waste.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of sensors, and particularly relates to a low-ear-rate deep-drawing sensor shell cold-rolled austenitic stainless steel and a manufacturing method thereof. BACKGROUND

[0002] As an important protective part of a precision sensor element, a sensor shell is often made of plastic, aluminum, copper, stainless steel and the like. Austenitic stainless steel is widely used in daily life, and in particular, 304 stainless steel is an excellent food-grade stainless steel, which is more corrosion-resistant and reliable than conventional aluminum and plastic materials. In the temperature sensor shell industry, a stainless steel material with a thickness of 0.4 mm is generally used. The stainless steel material produced by a conventional production process has a local material protrusion at the edge of the shell body during the stretching of the sensor shell, that is, an ear phenomenon. The protruding edge can seriously damage the mold during further stretching, and a process of cutting off the ear is also needed, which not only increases the production cost and reduces the efficiency, but also causes great waste of raw materials. SUMMARY

[0003] Therefore, the application aims to provide a low-ear-rate deep-drawing sensor shell cold-rolled austenitic stainless steel and a manufacturing method thereof to solve at least one technical problem in the background art.

[0004] To achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0005] A preparation method of a low-ear-rate deep-drawing sensor shell cold-rolled austenitic stainless steel, comprising the following steps:

[0006] S1: hot-rolled black skin is subjected to a hot-rolled continuous pickling unit to obtain white skin raw material;

[0007] S2: the white skin raw material obtained in step S1 is subjected to rolling by a twenty-roll single-stand reversible cold rolling mill to obtain hard-state plate;

[0008] S3: the hard-state plate obtained in step S2 is subjected to intermediate process annealing by a cold-rolled annealing process to obtain soft-state material with a grain size of 7.5-8;

[0009] S4: the soft-state material obtained in step S3 is subjected to rolling to obtain hard-state material.

[0010] S5: the hard-state material is subjected to cold-rolled annealing and pickling to obtain material with a grain size of 8.

[0011] Further, the thickness of the hot-rolled black skin in step S1 is 2.4-2.6 mm.

[0012] Further, in step S2, the 20-roll single stand reversible cold rolling mill is rolled for 7 passes, and the first cold rolling deformation is controlled at 60%-70%, so as to obtain a hard state plate with a thickness of 0.78-0.82 mm.

[0013] Further, in step S3, the parameters of the intermediate process annealing are as follows: running speed of 135 m / min, and furnace temperature of 1050-1120 DEG C.

[0014] Further, in step S4, the soft state material is rolled for 5 passes, and the second cold rolling deformation is controlled at 50%-60%, so as to obtain a hard state material with a thickness of 0.38-0.42 mm.

[0015] A preparation method of a low-earring-rate deep-drawing sensor shell cold-rolled austenitic stainless steel, the low-earring-rate deep-drawing sensor shell cold-rolled austenitic stainless steel prepared by the method comprises, by mass percentage, 0-0.08% of carbon, 0-0.80% of silicon, 0-2.00% of manganese, 0-0.045% of phosphorus, 0-0.003% of sulfur, 18.00-20.00% of chromium, 8.00-10.00% of nickel, and the balance of iron.

[0016] Compared with the prior art, the low-earring-rate deep-drawing sensor shell cold-rolled austenitic stainless steel and the manufacturing method thereof have the following advantages:

[0017] Through the implementation of the low-earring-rate deep-drawing sensor shell cold-rolled austenitic stainless steel process method, the earring problem of the sensor shell in the stretching process is solved, the wear of the mold is greatly reduced, the production efficiency is improved, and the waste of materials is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and serve as an aid in explaining the principles of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 A product schematic diagram of the low-earring-rate deep-drawing sensor shell cold-rolled austenitic stainless steel described in Embodiment 1 of the present application;

[0020] Figure 2 A product schematic diagram of the low-earring-rate deep-drawing sensor shell cold-rolled austenitic stainless steel described in Comparative Example 1 of the present application. DETAILED DESCRIPTION

[0021] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0022] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] Example 1

[0024] In this embodiment, the specific implementation process and key process parameters of a cold-rolled austenitic stainless steel process for a low earing rate deep-drawing sensor shell are provided. The material is a conventional 304 grade steel with a 2.5*1240 specification black skin raw material.

[0025] S1: The hot-rolled black skin raw material with a nominal thickness of 2.5 mm is subjected to a conventional hot-rolled continuous annealing and pickling unit to obtain a white skin raw material.

[0026] S2: The raw material of the first plate is rolled by a twenty-roll single-stand reversible cold rolling mill for 7 passes, with the first cold rolling deformation controlled at 68%, to obtain a hard state plate with a thickness of about 0.8 mm.

[0027] S3: After rolling, the 0.8 mm hard state steel coil is subjected to intermediate process annealing (135 m / min running, furnace temperature 1050-1120°C) through a cold rolling and annealing process, to obtain a soft state material with a grain size of 7.5-8.

[0028] S4: The soft state material with a thickness of 0.8 mm is rolled for 5 passes with a total deformation of 50% to obtain a 0.4 mm hard state plate.

[0029] S5: The 0.4 mm hard state material after rolling is subjected to cold rolling, annealing and pickling to obtain a 2D surface material with a grain size of 7.5-8 and a planar anisotropy index Δr value of about -0.13. After sensor shell tensile testing, the ear height difference is 0.15 mm, which meets the tensile use requirements, as shown in Figure 1 .

[0030] The greater the cold rolling deformation, the more serious the fibrosis of the material grain structure, i.e. the more serious the deformation of the grain structure. During recrystallization annealing, the recrystallized grain orientation is not randomly distributed. The greater the deformation, the greater the degree of grain preferred orientation, and the stronger the deformation texture, thereby causing the material to have obvious differences in performance in the planar direction, and further causing the occurrence of earing after stretching. At the same time, without flattening and straightening, it is mainly to avoid one-way deformation and exacerbate the performance difference of the material in different directions.

[0031] Comparative Example 1

[0032] The material is a conventional 304 grade steel with a 2.5*1240 specification black skin raw material.

[0033] S1: The hot-rolled black skin raw material with a nominal thickness of 2.5 mm is subjected to a conventional hot-rolled continuous annealing and pickling unit to obtain a white skin raw material.

[0034] S2: The raw material of the first plate is rolled by a twenty-roll single-stand reversible cold rolling mill for 11 passes with a total deformation of 84%, to obtain a hard state plate with a thickness of about 0.4 mm.

[0035] S3: the 0.4mm hard material after rolling is subjected to cold rolling, annealing, pickling and skin passing to obtain a material with 2B surface, and the material is stretched and straightened, the grain size of the material is 8, the planar anisotropy index Δr value is about -0.60, the ear height difference is 0.85mm after sensor shell stretching test, which does not meet the requirement of continuous stretching sensor shell, and the material needs to be stretched after removing and cutting the ear, as shown in Figure 2 .

[0036] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a cold-rolled austenitic stainless steel for low-ear deep-drawing sensor housings, the cold-rolled austenitic stainless steel for low-ear deep-drawing sensor housings comprising, by mass percentage, carbon 0-0.08%, silicon 0-0.80%, manganese 0-2.00%, phosphorus 0-0.045%, sulfur 0-0.003%, chromium 18.00-20.00%, nickel 8.00-10.00%, and iron in the balance, characterized in that: The method comprises the following steps: S1: hot-rolled black skin is subjected to hot-rolled continuous annealing and pickling to obtain white skin raw material; S2: the white skin raw material obtained in step S1 is subjected to rolling by a twenty-roller single-stand reversible cold rolling mill to obtain hard-state plate; S3: the hard-state plate obtained in step S2 is subjected to intermediate process annealing by a cold rolling annealing process to obtain soft-state material with a grain size of 7.5-8; S4: the soft-state material obtained in step S3 is subjected to rolling to obtain hard-state material; S5: the hard-state material is subjected to cold rolling annealing and pickling to obtain material with a grain size of 8 and a plane anisotropy index Δr value of -0.13; The thickness of the hot-rolled black skin in step S1 is 2.4-2.6 mm; In step S2, the twenty-roller single-stand reversible cold rolling mill is rolled for 7 passes, and the first cold rolling deformation is controlled to be 60%-70% to obtain hard-state plate with a thickness of 0.78-0.82 mm; In step S4, the soft-state material is subjected to rolling for 5 passes, and the second cold rolling deformation is 50%-60% to obtain hard-state material with a thickness of 0.38-0.42 mm.

2. A method of producing a low earing rate deep-drawing cold-rolled austenitic stainless steel for sensor housings according to claim 1, characterized in that: In step S3, the parameters of the intermediate process annealing are 135 m / min running and a furnace temperature of 1050-1120 ℃.

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