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Martensitic stainless steel rectangular billet continuous casting method

A martensitic stainless steel and rectangular billet technology, applied in the field of martensitic stainless steel rectangular billet continuous casting, can solve problems such as center loose shrinkage, and achieve the effect of improving surface quality

Active Publication Date: 2014-08-27
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many quality problems in this kind of steel in the continuous casting process, such as defects such as center porosity and shrinkage cavity, which have not been effectively solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment is in 175×215mm 2 It is carried out on a four-strand rectangular billet continuous casting machine, the steel type is 1Cr13, the liquidus line is 1495°C, and the chemical composition of the finished product is as follows:

[0019] C≤0.15; Si≤1.00; Mn≤1.00; P≤0.035; S≤0.030; Cr 11.50-13.50; Ni≤0.60; N≤0.030; the rest are Fe and unavoidable impurities.

[0020] Entering the LF furnace, the net weight of molten steel is 83t, the slag thickness is 230mm, the temperature is 1507°C, and the mass percentage of chemical composition is:

[0021] C 0.11; Si 0.43; Mn 0.49; P 0.013; S 0.002; Cr 11.56; Ni 0.06; N 0.0103; the rest is Fe and unavoidable impurities.

[0022] This embodiment includes the following steps in sequence:

[0023] Ⅰ In the LF refining furnace, 118Kg of high-carbon ferrochrome (C 7.8%, Cr 67%) is added, the cumulative power is sent for 23 minutes, 249m of ∮13mm silicon-calcium wire is fed, the temperature of molten steel is 1595°C, and ...

Embodiment 2

[0032] This embodiment is in 175×215mm 2 It is carried out on a four-strand rectangular billet continuous casting machine, the steel type is 2Cr13, the liquidus line is 1493°C, and the chemical composition of the finished product is as follows:

[0033] C 0.16-0.25; Si≤1.00; Mn≤1.00; P≤0.035; S≤0.030;

[0034] Cr 12.00-14.00; Ni≤0.60; N≤0.030; the rest is Fe and unavoidable impurities.

[0035] Entering the LF furnace, the net weight of molten steel is 85t, the thickness of slag is 220mm, the temperature is 1503°C, and the mass percentage of chemical composition is:

[0036] C 0.20; Si 0.45; Mn 0.42; P 0.015; S 0.001; Cr 12.30; Ni 0.07; N 0.011; the rest is Fe and unavoidable impurities.

[0037] This embodiment includes the following steps in sequence:

[0038] Ⅰ In the LF refining furnace, add high-carbon ferromanganese (C 7.0%, Mn 78%) 125Kg, accumulatively feed electricity for 22 minutes, feed ∮ 13mm silicon-calcium wire 255m, molten steel temperature 1590°C, chemical...

Embodiment 3

[0047] This embodiment is in 230×230mm 2 It is carried out on a four-strand billet continuous casting machine, the steel type is 3Cr13, the liquidus line is 1490°C, and the chemical composition of the finished product is as follows:

[0048] C 0.26-0.35; Si≤1.00; Mn≤1.00; P≤0.035; S≤0.030;

[0049] Cr 12.00-14.00; Ni≤0.60; N≤0.030; the rest is Fe and unavoidable impurities.

[0050] Entering the LF furnace, the net weight of molten steel is 83t, the slag thickness is 220mm, the temperature is 1510°C, and the mass percentage of chemical composition is:

[0051] C 0.30; Si 0.50; Mn 0.23; P 0.018; S 0.001; Cr 12.60; Ni 0.06;

[0052] N 0.0095; the rest is Fe and unavoidable impurities.

[0053] This embodiment includes the following steps in sequence ：

[0054] Ⅰ In the refining furnace, add 230Kg of high-carbon ferromanganese (C 7.5%, Mn 76%), accumulatively feed electricity for 19 minutes, feed ∮13mm calcium-silicon wire 249m, molten steel temperature 1589°C, composit...

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Abstract

The present invention relates to a method for continuous casting of martensitic stainless steel rectangular slabs, which comprises the following sequential steps: 1. Adjusting with high-carbon ferromanganese or high-carbon ferrochrome in the refining furnace, [S]≤ 0.005%, [N]≤0.018%; II superheat degree 20-40°C; immersion nozzle insertion depth 100-130mm; casting speed 0.75-1.15min; secondary cooling specific water volume 0.29-0.32L / Kg; EMS combined electromagnetic stirring, the frequency is 3-5Hz, the current intensity of M-EMS is 400-550A, and the current intensity of F-EMS is respectively: 1Cr13 current intensity 300-400A, 2Cr13 current intensity 450-550A, 3Cr13 current intensity 500-600A, The current intensity of 4Cr13 is 550-650A; the alkalinity of 4Cr13 mold slag is 0.90-1.05, the melting point is 1110-1130℃, and the viscosity (1300℃) is 0.1-0.13Pa.s; Ⅴ is cast into continuous casting slabs. The rectangular continuous casting slab continuously cast by the method has no cracks on the surface, and the surface depression is less than 1.0 mm.

Description

technical field [0001] The invention relates to a method for continuous casting of a martensitic stainless steel rectangular billet. Background technique [0002] 1Cr13, 2Cr13, 3Cr13 and 4Cr13 are several grades used in large quantities in martensitic stainless steel. Because of their high strength, hardness, toughness and wear resistance, they are selected for making blades, fasteners and valves. , Shafts and tools and other main materials. At present, many manufacturers have applied the martensitic stainless steel rectangular billet continuous casting technology to industrial production. However, there are still many quality problems in this kind of steel in the continuous casting process, such as defects such as center porosity and shrinkage cavity, which have not been effectively resolved. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the existing method for continuous casting of martensitic stainless steel rectangular sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/40C22C33/06B22D11/00B22D11/115B22D11/07
Inventor 张增武刘亮陈景锋谭俊任国
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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