Sulfur-containing tellurium-containing free-cutting ferritic stainless steel and manufacturing method thereof

A kind of stainless steel and ferrite technology, applied in the direction of manufacturing tools, metal rolling, temperature control, etc., can solve problems such as poor turning performance, and achieve the effect of improving turning performance, uniform metallographic structure, and improving corrosion resistance.

Active Publication Date: 2022-03-15
浙江青山钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent with the publication number CN 105132812A discloses a ferritic free-cutting stainless steel, which is characterized in that the composition of alloying elements in weight percent: C≤0.025%, Si 0.05-0.80%, Mn 0.5-0.8%, P 0.02-0.04 , S 0.01~0.1%, Cr 15.0-20.0%, Ti 0.05~0.5%, N 0.04~0.06%, Mo 0.8~1.2%, the balance of iron and unavoidable impurities, the invention improves the plasticity and corrosion resistance , but poor machinability

Method used

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  • Sulfur-containing tellurium-containing free-cutting ferritic stainless steel and manufacturing method thereof
  • Sulfur-containing tellurium-containing free-cutting ferritic stainless steel and manufacturing method thereof
  • Sulfur-containing tellurium-containing free-cutting ferritic stainless steel and manufacturing method thereof

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preparation example Construction

[0066] The present invention provides a method for preparing the above free-cutting ferritic stainless steel containing sulfur and tellurium, comprising the following steps: electric furnace smelting→AOD furnace refining→LF furnace refining→continuous casting→rolling→annealing, wherein:

[0067] Electric furnace smelting: melting raw materials into molten steel in an electric furnace;

[0068] AOD furnace refining: molten steel is decarburized and chromium-preserved in the AOD furnace, so that the C content in molten steel after decarburization and chromium preservation is not higher than the target value; argon gas is blown and stirred throughout the refining process to ensure that the N content is not higher than the target value;

[0069] LF furnace refining: add materials according to the target value of each component in the molten steel in the next step, then add ferroboron to make the B content the target value, and then feed tellurium wire to make the Te content the tar...

Embodiment 1

[0097] The sulfur-containing and tellurium-containing free-cutting ferritic stainless steel described in this embodiment comprises, by mass percentage: C: 0.042%, Si: 0.40%, Mn: 0.81%, P: 0.023%, S: 0.25%, Ni: 0.22%, Cr: 17.23%, Mo: 0.26%, N: 0.018%, Te: 0.0081%, B: 0.0019%, and the rest are iron and unavoidable impurities. The production process of the above-mentioned free-cutting ferritic stainless steel containing sulfur and tellurium is: electric furnace→AOD→LF→continuous casting→rolling→annealing, specifically:

[0098] Electric furnace: 30 tons of electric furnace is used for smelting, and the raw materials are 34 tons of waste stainless steel with low P and five harmful elements (Pb, Sn, As, Sb, Bi). Add 14 tons of small pieces of raw materials. After complete melting, the P content is 0.023%, and the content of other elements is: C: 0.806%, Si: 0.14%, Mn: 0.68%, S: 0.017%, Ni: 0.22%, Cr: 16.99 %, Mo: 0.26%, N: 0.072%, adjust the temperature to 1670°C, pull out 2 / 3 of ...

Embodiment 2

[0106] The sulfur-containing and tellurium-containing free-cutting ferritic stainless steel described in this embodiment comprises, by mass percentage: C: 0.049%, Si: 0.51%, Mn: 0.99%, P: 0.014%, S: 0.28%, Ni: 0.30%, Cr: 17.33%, Mo: 0.32%, N: 0.009%, Te: 0.0062%, B: 0.0021%, and the rest are iron and unavoidable impurities. The production process of the above sulfur-containing and tellurium-containing free-cutting ferritic stainless steel is: electric furnace→AOD→LF→continuous casting→rolling→annealing, specifically:

[0107] Electric furnace: 30 tons of electric furnace is used for smelting, and the raw materials are 33 tons of scrap stainless steel with low P and low five harmful elements (Pb, Sn, As, Sb, Bi). Add 8 tons of small pieces of raw materials. After complete melting, the P content is 0.014%, and the content of other elements is: C: 0.780%, Si: 0.16%, Mn: 0.61%, S: 0.016%, Ni: 0.32%, Cr: 16.81 %, Mo: 0.34%, N: 0.016%, adjust the temperature to 1675°C, pull out 2 / 3...

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Abstract

The invention relates to free-cutting ferritic stainless steel, in particular to free-cutting ferritic stainless steel containing sulfur and tellurium and a preparation method of the free-cutting ferritic stainless steel. The free-cutting ferritic stainless steel containing sulfur and tellurium comprises the following components in percentage by mass: less than or equal to 0.10% of C, less than or equal to 1.0% of Si, less than or equal to 1.25% of Mn, less than or equal to 0.03% of P, 0.20-0.30% of S, less than or equal to 0.60% of Ni, 17.0-18.0% of Cr, less than or equal to 0.60% of Mo, less than or equal to 0.05% of N, 0.005-0.015% of Te, 0.001-0.005% of B and the balance of iron and inevitable impurities. The sulfur-containing tellurium-containing free-cutting ferritic stainless steel is prepared through electric furnace smelting, AOD furnace refining, LF furnace refining, continuous casting, rolling and annealing, the turning performance, corrosion resistance and plasticity of the sulfur-containing tellurium-containing free-cutting ferritic stainless steel are completely superior to those of a common 430F material, and the sulfur-containing tellurium-containing free-cutting ferritic stainless steel has a wider industrial application prospect.

Description

technical field [0001] The invention relates to a free-cutting stainless steel, in particular to a free-cutting ferritic stainless steel containing sulfur and tellurium and a preparation method thereof. Background technique [0002] Due to its excellent corrosion resistance, plasticity and machinability, stainless steel is widely used. At present, it not only has a large amount in petroleum, chemical industry, marine and machinery, but also occupies a large amount in food, medical treatment, electronics, office, etc. Important position. However, the work hardening of stainless steel is relatively large, which makes its machinability poor, resulting in low precision of the workpiece and low efficiency of automatic processing. As the amount of stainless steel is increasing, the requirements for automatic processing and high precision of stainless steel workpieces are increasingly urgent. Therefore, it is extremely necessary to improve the machinability of stainless steel prod...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C38/44C22C38/54C22C33/06C21D8/06C21D1/26B21B1/46B21B37/74B21B45/00B21B3/02C21C5/00C21C5/52B22D11/00
CPCC22C38/02C22C38/04C22C38/60C22C38/44C22C38/001C22C38/54C22C33/06C21D8/065C21D1/26B21B1/463B21B37/74B21B45/004B21B3/02C21C5/005B22D11/002C21D2211/005Y02P10/20
Inventor 严道聪王贞应马振宇季灯平李立
Owner 浙江青山钢铁有限公司
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