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High strength and toughness Q690E steel plate for engineering machinery and production method thereof

A technology of Q690E and construction machinery, which is applied to the Q690E steel plate for high-strength and toughness construction machinery and its production field. It can solve the problems of high yield strength of steel plate and poor formability of steel plate, and achieve good strength and toughness, good matching, and shortened delivery time. Effect

Inactive Publication Date: 2018-12-18
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (3) The yield strength of the steel plate produced in the prior art is relatively high, between 0.88-0.94, resulting in poor formability of the steel plate

Method used

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  • High strength and toughness Q690E steel plate for engineering machinery and production method thereof
  • High strength and toughness Q690E steel plate for engineering machinery and production method thereof
  • High strength and toughness Q690E steel plate for engineering machinery and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, the Q690E steel plate for high-strength and tough construction machinery is produced by continuous casting slab, and the thickness of the steel plate is 12 mm; its chemical composition and mass percentage are: C: 0.05, Si: 0.31, Mn: 1.45, P: 0.010, S: 0.003, Nb: 0.052, Ti: 0.025, Cr: 0.39, Mo: 0.25, Cu: 0.46, Ni: 0.28, Als: 0.040, the rest are Fe and other unavoidable impurities;

[0041] The production method described in this embodiment includes steelmaking, continuous casting, TMCP, DQ+ACC cooling, and heat treatment processes;

[0042] (1) Heating process, the temperature in the heating section is 1150-1170°C, the temperature in the soaking section is 1125-1140°C, and the total heating time is 5 hours;

[0043] (2) Rolling process, using TMCP technology, two-stage controlled rolling mode; the starting temperature of rolling is 1035°C; the finishing temperature of the first stage is 985°C; the starting temperature of the second stage is 900°C; the te...

Embodiment 2

[0048] In this example, the Q690E steel plate for high-strength and tough construction machinery is produced by continuous casting slab, and the thickness of the steel plate is 15 mm; its chemical composition and mass percentage are: C: 0.06, Si: 0.35, Mn: 1.40, P: 0.012, S: 0.002, Nb: 0.060, Ti: 0.015, Cr: 0.45, Mo: 0.20, Cu: 0.40, Ni: 0.30, Als: 0.025, and the rest are Fe and other unavoidable impurities.

[0049] The production method described in this embodiment includes steelmaking, continuous casting, TMCP, DQ+ACC cooling, and heat treatment processes.

[0050] (1) Heating process, the temperature of the heating section is 1160-1165°C, the temperature of the soaking section is 1115-1130°C, and the total heating time is 4.5 hours;

[0051] (2) The rolling process adopts TMCP technology and two-stage controlled rolling mode; the starting rolling temperature is 1028°C; the final rolling temperature of the first stage is 960°C; the starting temperature of the second stage is...

Embodiment 3

[0056] In this example, the Q690E steel plate for high-strength and tough construction machinery is produced by continuous casting slab, and the thickness of the steel plate is 20mm; its chemical composition and mass percentage are: C: 0.04, Si: 0.25, Mn: 1.30, P: 0.011, S: 0.004, Nb: 0.050, Ti: 0.020, Cr: 0.40, Mo: 0.18, Cu: 0.50, Ni: 0.35, Als: 0.0215, and the rest are Fe and other unavoidable impurities.

[0057] The production method described in this embodiment includes steelmaking, continuous casting, TMCP, DQ+ACC cooling, and heat treatment processes.

[0058] (1) Heating process, the temperature of the heating section is 1150-1168°C, the temperature of the soaking section is 1122-1137°C, and the total heating time is 4.8 hours;

[0059] (2) Rolling process, using TMCP technology, two-stage controlled rolling mode; the starting rolling temperature is 1044°C; the final rolling temperature of the first stage is 955°C; the starting temperature of the second stage is 862°C;...

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Abstract

The invention provides a high strength and toughness Q690E steel plate for engineering machinery. The chemical components of the high strength and toughness Q690E steel plate for engineering machinerycomprise, by mass, 0.04-0.07% of C, 0.25-0.35% of Si, 1.30-1.45% of Mn, 0.014% or less of P, 0.005% or less of S, 0.050-0.060% of Nb, 0.010-0.025% of Ti, 0.35-0.45% of Cr, 0.15-0.25% of Mo, 0.40-0.50% of Cu, 0.25-0.35% of Ni, 0.015-0.040% of Als, and the balance Fe and unavoidable impurities. During rolling, the TMCP technology is adopted in cooperation with the ultra-fast cooling technology, thelow finish cooling temperature technology and the low temperature tempering technology, so that the low-cost high strength and toughness Q690E steel plate for engineering machinery is obtained and has good interior structure uniformity and good low temperature impact toughness.

Description

technical field [0001] The invention relates to a steel plate and a production method thereof, in particular to a high-strength toughness engineering machinery Q690E steel plate and a production method thereof. Background technique [0002] High-strength steel Q690E for construction machinery requires high strength, hardness, toughness and weldability, and is a type of low-alloy steel with high strength and excellent low-temperature impact toughness. Most domestic steel mills can produce this high-strength steel for construction machinery; for example, Wuyang Iron and Steel Co., Ltd. applied for a patent "a low-cost and low yield strength ratio quenched and tempered Q690E steel plate and its production method" (public number CN106399840A), Nanjing Iron and Steel "A production method of high-transverse-longitudinal-impact-ratio and large-thickness Q690E high-strength steel" (public number CN 106282774A) declared by the Co., Ltd.; Method" (publication number CN103556061A) and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C21D2211/002C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50
Inventor 李玉谦成慧梅许伟杜琦铭姚宙杨雄孙电强
Owner HANDAN IRON & STEEL GROUP
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