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Martensitic stainless steel rectangular billet continuous casting method

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

Active Publication Date: 2012-11-28
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

[0019] 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:

[0020] 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.

[0021] 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:

[0022] 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.

[0023] This embodiment includes the following steps in sequence:

[0024] 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

[0033] 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:

[0034] C 0.16-0.25; Si≤1.00; Mn≤1.00; P≤0.035; S≤0.030;

[0035] Cr 12.00-14.00; Ni≤0.60; N≤0.030; the rest is Fe and unavoidable impurities.

[0036] Entering the LF furnace, the net weight of molten steel is 85t, the slag thickness is 220mm, the temperature is 1503°C, and the mass percentage of chemical composition is:

[0037] 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.

[0038] This embodiment includes the following steps in sequence:

[0039] 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 co...

Embodiment 3

[0048] 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:

[0049] C 0.26-0.35; Si≤1.00; Mn≤1.00; P≤0.035; S≤0.030;

[0050] Cr 12.00-14.00; Ni≤0.60; N≤0.030; the rest is Fe and unavoidable impurities.

[0051] 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:

[0052] C 0.30; Si 0.50; Mn 0.23; P 0.018; S 0.001; Cr 12.60; Ni 0.06;

[0053] N 0.0095; the rest is Fe and unavoidable impurities.

[0054] This embodiment includes the following steps in sequence ：

[0055] 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 invention relates to a martensitic stainless steel rectangular billet continuous casting method, which includes the following successive steps of: I. in a refining furnace, conducting adjustment with high carbon ferromanganese or high carbon ferrochrome, and controlling the content of [S] at less than or equal to 0.005% and the content of [N] at less than or equal to 0.018% in steel before continuous casting; II. controlling the superheat at 20-40DEG C, keeping an immersion nozzle insertion depth at 100-130mm, controlling a pulling speed at 0.75-1.15m / min, and maintaining a secondary cooling specific water flowrate at 0.29-0.32L / Kg; III. using M+F-EMS combined electromagnetic stirring, controlling the frequency at 3-5Hz and the M-EMS current intensity at 400-550A, and keeping the current intensity of F-EMS respectively at: 300-400A for 1Cr13, 450-550A for 2Cr13, 500-600A for 3Cr13, and 550-650A for 4Cr13; IV. maintaining the alkalinity of crystallizer protection slag at 0.90-1.05, the melting point at 1110-1130DEG C, and the viscosity at 0.1-0.13Pa.s (1300DEG C); and V. carrying out casting to obtain a continuous casting billet. The rectangular continuous casting billet casted by the method provided in the invention has no surface crack, and has surface dents less than 1.0mm.

Description

[0001] technical field [0002] The invention relates to a method for continuous casting of a martensitic stainless steel rectangular billet. Background technique [0003] 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 [0004] In order to overcome the above-mentioned shortcomings of the existing method for continuous casting of martensitic stainless steel recta...

Claims

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Application Information

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Patent Type & Authority Applications(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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