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Large-thickness quenched and tempered Q690E/F high-strength steel and manufacturing method thereof

A technology of Q690E, manufacturing method, applied in the field of metallurgy, to achieve the effect of good application prospects, good strength and toughness, and excellent atmospheric corrosion resistance

Active Publication Date: 2022-03-01
MINMETALS YINGKOU MEDIUM PLATE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, in the prior art, large-thickness quenched and tempered Q690E / F high-strength steel does not have high strength and atmospheric corrosion resistance at the same time.

Method used

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  • Large-thickness quenched and tempered Q690E/F high-strength steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A large-thickness quenched and tempered Q690E / F grade high-strength steel plate has a thickness of 100mm. The chemical composition and mass percentage of the steel plate are: C: 0.11%, Si: 0.4%, Mn: 1.4%, P: 0.009%, S : 0.003%, Al: 0.015%, Nb: 0.035%, Ni: 0.5%, B: 0.0008%, Ti: 0.008%, Cr: 0.4%, Mo: 0.5%, Cu: 0.25%, N: 0.002%, H : 0.0015%, the balance is Fe and unavoidable impurities, CEV=0.57%.

[0030] The production steps and process parameters of the steel plate are:

[0031] 1. Smelting: LF refining time is 40 minutes, RH vacuum treatment time is 15 minutes;

[0032] 2. Continuous casting: superheat degree 10℃, slab thickness 328mm, casting speed 0.7m / min, center segregation type C: none;

[0033] 3. Heating: The maximum heating temperature in the heating section is 1230°C, the temperature in the soaking section is 1220°C, and the total heating time of the billet in the heating furnace is 280min;

[0034] 4. Rolling and cooling: adopt the two-stage controlled rol...

Embodiment 2

[0038] A large-thickness quenched and tempered Q690E / F grade high-strength steel plate has a thickness of 110mm. The chemical composition and mass percentage of the steel plate are: C: 0.12%, Si: 0.38%, Mn: 1.45%, P: 0.010%, S : 0.002%, Al: 0.020%, Nb: 0.025%, Ni: 0.45%, B: 0.0008%, Ti: 0.02%, Cr: 0.45%, Mo: 0.4%, Cu: 0.35%, N: 0.001%, H : 0.0014%, the balance is Fe and unavoidable impurities, CEV=0.58.

[0039] The production steps and process parameters of the steel plate are:

[0040] 1. Smelting: LF refining time is 45 minutes, RH vacuum treatment time is 12 minutes;

[0041] 2. Continuous casting: superheat degree 12°C, slab thickness 328mm, casting speed 0.7m / min, center segregation type C: 0.5;

[0042] 3. Heating: The maximum heating temperature in the heating section is 1240°C, the temperature in the soaking section is 1210°C, and the total heating time of the billet in the heating furnace is 300min;

[0043] 4. Rolling and cooling: adopt the two-stage controlled r...

Embodiment 3

[0047] A large-thickness quenched and tempered Q690E / F grade high-strength steel plate has a thickness of 120mm. The chemical composition and mass percentage of the steel plate are: C: 0.13%, Si: 0.35%, Mn: 1.5%, P: 0.008%, S : 0.002%, Al: 0.025%, Nb: 0.028%, Ni: 0.42%, B: 0.0025%, Ti: 0.01%, Cr: 0.42%, Mo: 0.42%, Cu: 0.28%, N: 0.002%, H : 0.0012%, the balance is Fe and unavoidable impurities, CEV=0.59.

[0048] The production steps and process parameters of the steel plate are:

[0049] 1. Smelting: LF refining time is 48 minutes, RH vacuum treatment time is 15 minutes;

[0050] 2. Continuous casting: superheat degree 18°C, slab thickness 328mm, casting speed 0.7m / min, center segregation type C: 1.0;

[0051] 3. Heating: The maximum heating temperature in the heating section is 1240°C, the temperature in the soaking section is 1230°C, and the total heating time of the slab in the heating furnace is 310min;

[0052] 4. Rolling and cooling: The two-stage controlled rolling p...

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Abstract

The invention discloses a large-thickness quenched and tempered Q690E / F high-strength steel plate and a manufacturing method thereof. The manufacturing method comprises the steps of smelting, continuous casting, heating, rolling, cooling and heat treatment. The steel plate comprises the following components in percentage by weight: 0.11 to 0.14 percent of C, 0.25 to 0.4 percent of Si, 1.4 to 1.55 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.015 to 0.035 percent of Al, 0.020 to 0.035 percent of Nb, 0.4 to 0.5 percent of Ni, 0.0008 to 0.0025 percent of B, 0.008 to 0.02 percent of Ti, 0.4 to 0.45 percent of Cr, 0.4 to 0.5 percent of Mo, 0.25 to 0.35 percent of Cu, less than or equal to 0.0030 percent of N, less than or equal to 0.00015 percent of H and the balance of Fe. The steel plate has high strength, good low-temperature toughness and excellent atmospheric corrosion resistance, and can be used in the fields of engineering machinery, mining, ocean platforms and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a large-thickness quenched and tempered Q690E / F high-strength steel and a manufacturing method thereof. Background technique [0002] High-strength steel is a resource-saving product with high technical content and high added value. High-strength steel of Q690 and above grades has been widely used in construction machinery, mining, crane trucks, offshore platforms, etc. , has the characteristics of simple structure, light weight, high safety, large carrying capacity and long service life. Large-thickness high-strength steels are applied to key parts and play a vital role in the structure of large-scale components. Many domestic steel mills are studying the production process of large-thickness Q690 and above high-strength steels, but for adjustments with a thickness ≥100mm The quality of Q690 high-strength steel is less researched, and it is even more rare to meet...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/54C22C38/58B22D11/12B22D11/18B22D11/22C21C7/10C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/58C22C38/48C22C38/54C22C38/50C22C38/44C22C38/42C22C38/001C22C33/04C21D8/0205C21D8/0226C21D8/0263C21C7/10B22D11/225B22D11/18B22D11/1206
Inventor 张德勇李新宇李伟许继勇杨志强冯仰峰曲之国马林欧阳宇杨清山宋继强王博马鑫邴纯于涛
Owner MINMETALS YINGKOU MEDIUM PLATE
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