Casting method of free-cutting ferritic stainless steel

A ferrite and stainless steel technology, applied in the field of iron and steel smelting, can solve the problems of deterioration of steel toughness, inability to process, influence of hot working, etc., to reduce the cooling rate, avoid the problem of cracking, and enhance the feeding ability.

Active Publication Date: 2022-07-08
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this field, in order to improve the cutting performance of free-cutting stainless steel materials, Pb will be added to stainless steel materials, but because Pb is toxic, it will cause potential harm to the human body during the production process and product use.
[0003] In addition, the production of ferritic stainless steel has always been a problem, because of the high risk of cracking, there are few reports on the die casting method of this type of steel
Moreover, high sulfur content will further deteriorate the toughness of steel
After casting, the surface of the steel billet is very easy to form cracks on the surface of the steel ingot, or even break, which will seriously affect the subsequent thermal processing, or even fail to process, resulting in waste products
Another problem with high-sulfur ferritic free-cutting stainless steel is the control of carbon and nitrogen. The use of high-carbon mold slag and low-flow nitrogen control cannot meet the composition requirements of the product, which will have a great impact on the corrosion resistance of the subsequent finished products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In addition to iron and inevitable impurity elements, the chemical composition (mass percentage) of the molten steel to be poured is as follows:

[0054] C+N Si Mn P S Cr Mo Bi 0.022 0.42 1.20 0.031 0.30 20.05 1.86 0.15

[0055] (1) Control the tapping temperature of the molten steel to be poured within the range of liquidus temperature + 120°C.

[0056] (2) The mold casting ingot type adopts 5.8 tons of square ingot, the temperature of the ingot mold should be kept above 80 ℃ before pouring, and the molten steel flow rate should be controlled at 2.1 tons / min.

[0057] (3) The pouring process is protected by argon gas seal, and the argon gas flow rate is not less than 7.5m 3 / min, casting mold powder adopts low-carbon mold powder with a carbon content not exceeding 1.5%.

[0058] (4) After pouring, the vehicle is moved after 5 hours of standing time.

[0059] After testing, the surface of the steel ingot is good without cracks, and ...

Embodiment 2

[0062] In addition to iron and inevitable impurity elements, the chemical composition (mass percentage) of the molten steel to be poured is as follows:

[0063] C Si Mn P S Cr Mo Bi 0.035 0.69 1.01 0.031 0.19 18.2 1.2 0.05

[0064] (1) Control the tapping temperature of the molten steel to be poured within the range of liquidus temperature + 100 °C.

[0065] (2) The mold casting ingot type adopts 5.8 tons of square ingot, the temperature of the ingot mold should be kept above 80 ℃ before pouring, and the molten steel flow rate should be controlled at 2.5 tons / min.

[0066] (3) The pouring process is protected by argon gas seal, and the argon gas flow rate is not less than 6m 3 / min, casting mold powder adopts low-carbon mold powder with a carbon content not exceeding 1.8%.

[0067] (4) After pouring, the vehicle is moved after 5 hours of standing time.

[0068] After testing, the surface of the steel ingot is good without cracks, and the t...

Embodiment 3

[0072] In addition to iron and inevitable impurity elements, the chemical composition (mass percentage) of the molten steel to be poured is as follows:

[0073] C+N Si Mn P S Cr Mo Bi 0.015 0.39 1.28 0.038 0.35 24.5 3.1 0.3

[0074] (1) Control the tapping temperature of the molten steel to be poured within the range of liquidus temperature + 85°C.

[0075] (2) The mold casting ingot type adopts 5.8 tons of square ingot, the temperature of the ingot mold should be kept above 100 ℃ before pouring, and the molten steel flow rate should be controlled at 1.6 tons / min.

[0076] (3) The pouring process is protected by argon gas seal, and the argon gas flow rate is not less than 9m 3 / min, casting mold powder adopts low-carbon mold powder with a carbon content not exceeding 1.1%.

[0077] (4) After pouring, the vehicle is moved after the standing time is 4 hours.

[0078] After testing, the surface of the steel ingot is good, without cracks, and ...

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PUM

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Abstract

The invention belongs to the technical field of iron and steel smelting, and relates to a free-cutting ferritic stainless steel and a casting method thereof. The free-cutting ferritic stainless steel of the present invention, in terms of weight percentage, comprises: 0.005%≤C+N≤0.05%, Si 0.3%-0.8%, Mn 0.5%-2.0%, P 0.025%-0.05%, S0.15%-0.40%, Cr 18%-25%, Mo 1.0%-3.5%, Bi 0.05%-0.20%, the rest are iron and inevitable impurities. The free-cutting ferritic stainless steel of the present invention has low carbon content in the ingot, few internal defects in the ingot, good surface quality, avoids the problem of cracking, and can greatly improve the yield of subsequent rolling, wherein the yield of billet can be increased to 85%, The wire rod rolling yield can be increased to 93%.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a free-cutting ferritic stainless steel and a casting method thereof, in particular to a high-sulfur and high-corrosion-resistant ferritic free-cutting stainless steel and a casting method thereof. Background technique [0002] Free-cutting stainless steel usually needs to be cold-worked when machining precision devices, so that the dimensional accuracy and mechanical properties can meet the processing requirements. Ultra-free cutting ferritic stainless steel generally adopts multi-phase composite method to improve the cutting performance of steel. S element is a traditional free cutting element. When the S element of the steel grade exceeds 0.15%, the cutting performance of the steel is significantly improved. Mainly due to the formation of MnS inclusions by S element and Mn element added in the steel, the continuity of the matrix structure is split, stress concent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/38C22C38/60C22C38/22C22C38/04B22D7/00
CPCC22C38/02C22C38/38C22C38/60C22C38/22C22C38/002C22C38/004C22C38/04B22D7/00C21D2211/005Y02P10/20
Inventor 车德会李建民张增武张威杨红岗李欢
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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