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A kind of low-cost s420nl low temperature ductile steel plate and its manufacturing method

A low-temperature toughness and low-cost technology, applied in the field of iron and steel smelting, can solve the problems of high cost, many production processes, and high CEV, and achieve the effects of improving low-temperature impact performance, ensuring heating uniformity, and excellent welding performance.

Active Publication Date: 2021-05-11
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high carbon content of the above-mentioned steel design, the low-temperature impact performance is not ideal; the amount of alloy added is high, and the production cost is high; the CEV is too high, which is not good for welding performance; in addition, the steel plate needs to be normalized, and the production process is many and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a low-cost S420NL low-temperature tough steel plate and its manufacturing method, and the thickness of the steel plate is 60mm.

[0053] Its chemical composition and mass percentage are as follows: C: 0.14%, Mn: 1.51%, Si: 0.35%, P: 0.012%, S: 0.003%, Nb: 0.028%, V: 0.045%, Ni: 0.28%, Alt: 0.026%, CEV: 0.43%, the balance is Fe and impurities.

[0054] Steps include:

[0055] S1. Steelmaking process: molten steel P: 0.012% when using converter for deep dephosphorization, molten steel S: 0.003% for molten iron pretreatment and LF deep desulfurization, continuous casting production to prepare a slab with a thickness of 260mm;

[0056] S2. Heating process: the billet is heated in a heating furnace, the heating coefficient is 11.6min / cm, and the heating temperature is 1218°C;

[0057] S3. Rolling process: two-stage controlled rolling process is adopted, the first stage is rough rolling, and the rolling end temperature is 1022°C; the second stage is...

Embodiment 2

[0061] This embodiment provides a low-cost S420NL low-temperature tough steel plate and its manufacturing method, and the thickness of the steel plate is 60mm.

[0062] Its chemical composition and mass percentage are as follows: C: 0.13%, Mn: 1.55%, Si: 0.32%, P: 0.010%, S: 0.002%, Nb: 0.026%, V: 0.043%, Ni: 0.27%, Alt: 0.033%, CEV: 0.43%, the balance is Fe and impurities.

[0063] Steps include:

[0064] S1. Steelmaking process: molten steel P: 0.010% when using converter for deep dephosphorization, molten steel S: 0.002% for molten iron pretreatment and LF deep desulfurization, continuous casting production to prepare a slab with a thickness of 260mm;

[0065] S2. Heating process: the billet is heated in a heating furnace, the heating coefficient is 12.2min / cm, and the heating temperature is 1193°C;

[0066] S3. Rolling process: Two-stage controlled rolling process is adopted, the first stage is rough rolling, and the rolling end temperature is 1193°C; the second stage is...

Embodiment 3

[0070] This embodiment provides a low-cost S420NL low-temperature tough steel plate and its manufacturing method, and the thickness of the steel plate is 40mm.

[0071] Its chemical composition and mass percentage are as follows: C: 0.13%, Mn: 1.46%, Si: 0.27%, P: 0.014%, S: 0.003%, Nb: 0.023%, V: 0.038%, Ni: 0.24%, Alt: 0.028%, CEV: 0.41%, the balance is Fe and impurities.

[0072] Steps include:

[0073] S1, steelmaking process: molten steel P: 0.014% when using converter for deep dephosphorization, molten steel S: 0.003% for molten iron pretreatment and LF deep desulfurization, continuous casting production to prepare a slab with a thickness of 260mm;

[0074] S2. Heating process: the billet is heated in a heating furnace, the heating coefficient is 11.1min / cm, and the heating temperature is 1204°C;

[0075] S3. Rolling process: two-stage controlled rolling process is adopted, the first stage is rough rolling, and the rolling end temperature is 1012°C; the second stage is...

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Abstract

The invention discloses a low-cost S420NL low-temperature ductile steel plate and its manufacturing method, which relate to the technical field of iron and steel smelting. Its chemical composition and mass percentage are as follows: C: 0.12%-0.15%, Mn: 1.40%-1.60%, Si: 0.20% ~0.40%, P≤0.015%, S≤0.005%, Nb:0.015%~0.030%, V:0.030%~0.050%, Ni:0.10%~0.30%, Alt:0.020%~0.050%, CEV≤0.45% , the balance being Fe and impurities. The invention adopts low carbon content design, and replaces normalizing heat treatment with normalizing rolling process, cancels normalizing heat treatment process, and obtains S420NL low-temperature tough steel plate whose performance fully meets the requirements of EN10025‑3 standard, with low production cost and realizes economy and high efficiency Production.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a low-cost S420NL low-temperature tough steel plate and a manufacturing method. Background technique [0002] S420NL steel plate is an EN10025-3 standard product, which requires normalizing or normalizing rolling delivery. It is mainly used in key structural parts such as large bridges, long-span buildings, wind power, hydropower, and marine engineering. Steel plates are not only required to have a high strength grade, but also have strict requirements on the product's low-temperature impact performance, lamellar tear resistance, internal quality, and welding performance. The greater the thickness of the steel plate, the greater the rolling compression ratio is required to improve the quality of internal segregation and porosity. During smelting, the content of low phosphorus and sulfur should be controlled to improve the cleanliness of molten steel, so as to ensu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/08C22C38/06C21D8/02
CPCC21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 潘中德吴俊平谯明亮方磊刘继宏陈富强高飞李伟张淼
Owner NANJING IRON & STEEL CO LTD
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