430 stainless steel for cold stamping processing, and manufacturing method thereof

A manufacturing method, stainless steel technology, applied in the field of iron and steel materials, can solve the problems of poor formability, poor polishing performance, low cold rolling reduction rate, etc., to improve the formability of finished products, ensure cold stamping formability, and ensure elongation performance Effect

CN103667950AInactive Publication Date: 2014-03-26NINGBO BAOXIN STAINLESS STEEL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-03-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention discloses a 430 stainless steel for cold stamping processing, and a manufacturing method thereof. The 430 stainless steel comprises 0.03-0.08 wt% of C, 0-0.85 wt% of Si, 0-0.6 wt% of Mn, 0-0.030 wt% of S, 16.00-18.00 wt% of Cr, 0-0.75 wt% of Ni, 0-0.07 wt% of N, and the balance of Fe and inevitable trace impurities, wherein the trace impurity P content is less than 0.040 wt%. The production method comprises steps such as hot rolling coil annealing, acid washing, cold rolling, finished product annealing, acid washing, temper rolling, and trimming coil cutting, and is characterized in that the hot rolling coil annealing temperature is controlled at 820-860 DEG C, and the thermal insulation time is 10-19 h. Compare with the manufacturing method in the prior art, the manufacturing method of the present invention has the following characteristics that: it can be ensured that the elongation after fracture of the finished product is more than 26%, and the cold stamping molding performance can be ensured.
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Description

technical field

[0001] The invention belongs to the technical field of iron and steel materials, and relates to a 430 stainless steel suitable for cold stamping with excellent formability and wrinkle resistance and a manufacturing method thereof. Background technique

[0002] 430 stainless steel is a general-purpose steel with good corrosion resistance. Its thermal conductivity is better than that of austenite, and its thermal expansion coefficient is smaller than that of 430 stainless steel pipe austenite. 430 stainless steel is used for architectural decoration, fuel burner parts, household appliances, and home appliance parts. Among them, 430 stainless steel has a lower elongation rate than 304 and other austenitic stainless steels and ordinary carbon steels, so the formability is relatively poor; 430 stainless steel has the defect that it is easy to wrinkle during cold rolling, and its polishing performance after processing is relatively poor. The cold stamping process...

Examples

Embodiment 1

[0034] 1. A kind of 430 stainless steel suitable for cold stamping processing, the weight percentage ratio of its chemical composition is:

[0035] C: 0.048%, Si: 0.32%, Mn: 0.38%, P: 0.025%, S: 0.005%, Cr: 16.18%, Ni: 0.21%, N: 0.036%, the balance is iron and unavoidable trace impurities .

[0036] 2, the manufacturing method of this 430 stainless steel comprises the following steps:

[0037] (1) Prepare steel ingot or slab according to the proportioning;

[0038] (2) Annealing in bell furnace for hot-rolled coils, the temperature is controlled at 846°C, and the holding time is 15 hours;

[0039] (3) pickling of hot-rolled coils to remove iron oxide scales produced by hot-rolling and bell-type furnace annealing;

[0040] (4) Cold rolling, the reduction rate is controlled between 73.3%;

[0041] (5) Annealing of cold-rolled coils, the temperature is controlled between 870°C and the holding time is between 52s;

[0042] (6) pickling of cold-rolled coils to remove iron oxid...

Embodiment 2

[0046] 1. A kind of 430 stainless steel suitable for cold stamping processing, the weight percentage ratio of its chemical composition is:

[0047] C: 0.049%, Si: 0.23%, Mn: 0.35%, P: 0.029%, S: 0.001%, Cr: 16.40%, Ni: 0.09%, N: 0.039%, the balance is iron and unavoidable trace impurities .

[0048] 2, the manufacturing method of this 430 stainless steel comprises the following steps:

[0049] (1) Prepare steel ingot or slab according to the proportioning;

[0050] (2) Annealing in a bell-type furnace for hot-rolled coils, the temperature is controlled at 847°C, and the holding time is 15 hours;

[0051] (3) pickling of hot-rolled coils to remove iron oxide scales produced by hot-rolling and bell-type furnace annealing;

[0052] (4) Cold rolling, the reduction rate is controlled between 77.1%;

[0053] (5) Annealing of cold-rolled coils, the temperature is controlled between 872°C and the holding time is between 51s;

[0054] (6) pickling of cold-rolled coils to remove ir...

Embodiment 3

[0058] 1. A kind of 430 stainless steel suitable for cold stamping processing, the weight percentage ratio of its chemical composition is:

[0059] C: 0.053%, Si: 0.24%, Mn: 0.26%, P: 0.027%, S: 0.004%, Cr: 16.13%, Ni: 0.13%, N: 0.034%, the balance is iron and unavoidable trace impurities .

[0060] 2, the manufacturing method of this 430 stainless steel comprises the following steps:

[0061] (1) Prepare steel ingot or slab according to the proportioning;

[0062] (2) Annealing in the hot-rolled coil bell furnace, the temperature is controlled at 845 ° C, and the holding time is 15 hours;

[0063] (3) pickling of hot-rolled coils to remove iron oxide scales produced by hot-rolling and bell-type furnace annealing;

[0064] (4) Cold rolling, the reduction rate is controlled between 73.3%;

[0065] (5) Annealing of cold-rolled coils, the temperature is controlled between 871°C and the holding time is between 53s;

[0066] (6) pickling of cold-rolled coils to remove iron oxi...