High-strength S420 NL-Z35 low-temperature toughness steel plate and manufacturing method thereof

A technology of S420NL-Z35, low temperature toughness, applied in the field of iron and steel smelting, can solve the problems of high production cost, unsatisfactory low temperature impact performance, high alloy addition amount, etc., to achieve excellent welding performance, reduce addition amount, and improve low temperature impact performance. Effect

Pending Publication Date: 2019-09-20
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the existing S420NL-Z35 steel plate generally adopts a higher carbon content and CEV design to ensure the strength after normalizing. Due to the higher carbon content, the low-temperature impact performance of the above-mentioned steel design is not ideal, and the CEV is relatively high. bad performance
In addition, in order to ensure low-temperature impact performance at -50°C, more Ni is added to improve toughness, and the amount of alloy added is high, and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A high-strength S420NL-Z35 low-temperature toughness steel plate and its manufacturing method provided in this embodiment, the thickness of the steel plate is 100mm, its chemical cost and mass percentage are as follows: C: 0.14%, Mn: 1.58%, Si: 0.41%, P: 0.010 %, S: 0.002%, Nb: 0.028%, V: 0.058%, Ni: 0.18%, Alt: 0.032%, CEV: 0.44%, and the balance is Fe and unavoidable impurities.

[0068] Steps include:

[0069] S1. Steelmaking process: molten steel P: 0.010% during deep dephosphorization of converter, molten steel S: 0.002% during molten iron pretreatment desulfurization and LF deep desulfurization, continuous casting production to prepare a slab with a thickness of 320 mm;

[0070] S2. Heating process: the billet is heated in a heating furnace, the heating coefficient is 10.7min / cm, and the heating temperature is 1208°C;

[0071] S3. Rolling process: Two-stage controlled rolling process is adopted, the finishing temperature of rough rolling in the first stage is 101...

Embodiment 2

[0076] A high-strength S420NL-Z35 low-temperature toughness steel plate and its manufacturing method provided in this embodiment, the thickness of the steel plate is 100mm, and its chemical cost and mass percentage are as follows: C: 0.15%, Mn: 1.55%, Si: 0.39%, P: 0.012 %, S: 0.002%, Nb: 0.027%, V: 0.052%, Ni: 0.17%, Alt: 0.035%, CEV: 0.44%, and the balance is Fe and unavoidable impurities.

[0077] Steps include:

[0078] S1. Steelmaking process: molten steel P: 0.012% during deep dephosphorization of converter, molten steel S: 0.002% during molten iron pretreatment desulfurization and LF deep desulfurization, continuous casting production to prepare a slab with a thickness of 320 mm;

[0079] S2. Heating process: the billet is heated in a heating furnace, the heating coefficient is 10.5min / cm, and the heating temperature is 1205°C;

[0080] S3. Rolling process: Two-stage controlled rolling process is adopted, the finishing temperature of rough rolling in the first stage is...

Embodiment 3

[0085] A high-strength S420NL-Z35 low-temperature toughness steel plate and its manufacturing method provided in this embodiment, the thickness of the steel plate is 95mm, and its chemical cost and mass percentage are as follows: C: 0.13%, Mn: 1.56%, Si: 0.37%, P: 0.011 %, S: 0.003%, Nb: 0.026%, V: 0.055%, Ni: 0.15%, Alt: 0.028%, CEV: 0.43%, and the balance is Fe and unavoidable impurities.

[0086] Steps include:

[0087] S1. Steelmaking process: molten steel P: 0.011% during deep dephosphorization of converter, molten steel S: 0.003% during molten iron pretreatment desulfurization and LF deep desulfurization, continuous casting production to prepare a slab with a thickness of 320 mm;

[0088] S2. Heating process: the billet is heated in a heating furnace, the heating coefficient is 11.3min / cm, and the heating temperature is 1201°C;

[0089] S3. Rolling process: Two-stage controlled rolling process is adopted, the finishing temperature of rough rolling in the first stage is ...

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Abstract

The invention discloses a high-strength S420 NL-Z35 low-temperature toughness steel plate and a manufacturing method thereof, and relates to the technical field of steel smelting. The steel plate comprise the following chemical components of, in percentage by mass, 0.13%-0.15% of C, 1.40%-1.60 of Mn, 0.30%-0.45% of Si, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020%-0.030% of Nb, 0.040%-0.060% of V, 0.020%-0.050% of Alt, less than or equal to 0.45% of CEV, and the balance Fe and inevitable impurities. A low carbon content design is adopted, the process of rolling, the special normalizing heat treatment and the like are controlled, the S420 NL-Z35 steel plate with the maximum thickness 100 mm is developed, the product quality is excellent, the production cost is controlled to be appropriate, and the comprehensive cost ratio is high.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a high-strength S420NL-Z35 low-temperature tough steel plate and a manufacturing method. Background technique [0002] S420NL-Z35 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. The steel plate not only requires high strength Grades also have strict requirements in terms of 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 problems such as 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/08C22C38/06C22C38/04C22C38/02C22C33/04C21C7/064C21D8/02C21D1/28
CPCC22C38/12C22C38/08C22C38/06C22C38/04C22C38/02C22C38/002C22C33/04C21C7/064C21D8/0205C21D8/0226C21D1/28
Inventor 潘中德吴俊平谯明亮胡其龙高飞李伟姜金星姜辉顾小阳
Owner NANJING IRON & STEEL CO LTD
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