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Hardened and tempered S460G1+Q structural steel and manufacturing method thereof

A manufacturing method and technology for structural steel, applied in the field of low-alloy quenched and tempered steel production, can solve problems such as impacting unstable steel plates in the center of thick quenched and tempered steel plates, and achieve excellent internal quality, low alloy cost, and excellent comprehensive mechanical properties Effect

Active Publication Date: 2015-10-21
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a quenched and tempered S460G1+Q structural steel and its manufacturing method, through the use of 400mm thick continuous casting slab and strict rolling and heat treatment process, to solve the problem of unstable impact at the core of the quenched and tempered steel plate and flaw detection of the steel plate There are problems such as local defects

Method used

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  • Hardened and tempered S460G1+Q structural steel and manufacturing method thereof
  • Hardened and tempered S460G1+Q structural steel and manufacturing method thereof
  • Hardened and tempered S460G1+Q structural steel and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A quenched and tempered S460G1+Q structural steel, smelting slab, slab casting (slab thickness: 400mm), steel plate rolling (steel plate thickness: 130mm) and heat treatment (quenching and tempering) in the 4300mm wide and thick plate production line of Shouqin Company . Its chemical composition (wt%) is as shown in table 1-1:

[0022] Table 1-1 billet chemical composition (wt%)

[0023] Ingredient number

C

Si

mn

P

S

Ni

Mo

V

Ti

Alt

CFQ

1#

0.055

0.35

1.64

0.007

0.0029

0.54

0.22

0.040

0.012

0.030

0.42

[0024] The billet heating temperature is 1180℃~1220℃, and the furnace time is 410min.

[0025] Steel plate rolling process parameters are shown in Table 1-2:

[0026] Table 1-2 Rolling process parameter settings

[0027]

[0028] Embodiment 1 uses 400mm continuous casting slab, rolling 130mm specification steel plate, the rough rolling end waiting temperatu...

Embodiment 2

[0040] A quenched and tempered S460G1+Q structural steel, smelting slab, slab casting (slab thickness: 400mm), steel plate rolling (steel plate thickness: 130mm) and heat treatment (quenching and tempering) in the 4300mm wide and thick plate production line of Shouqin Company . Its chemical composition (wt%) is shown in Table 2-1:

[0041] Table 2-1 Billet Chemical Composition (wt%)

[0042] Ingredient number

C

Si

mn

P

S

Ni

Mo

V

Ti

Alt

CEQ

2#

0.061

0.38

1.55

0.008

0.0025

0.42

0.19

0.035

0.013

0.042

0.39

[0043] The billet heating temperature is 1180℃~1220℃, and the furnace time is 425min.

[0044] Steel plate rolling process parameters are shown in Table 1-2:

[0045] Table 2-2 Rolling process parameter setting

[0046]

[0047] Example 2 uses a 400mm continuous casting slab, rolling a 130mm specification steel plate, the thickness of the waiting temperature at ...

Embodiment 3

[0059] A quenched and tempered S460G1+Q structural steel, smelting slab, slab casting (slab thickness: 400mm), steel plate rolling (steel plate thickness: 130mm) and heat treatment (quenching and tempering) in the 4300mm wide and thick plate production line of Shouqin Company . Its chemical composition (wt%) is shown in Table 3-1:

[0060] Table 3-1 Billet Chemical Composition (wt%)

[0061] Ingredient number

C

Si

mn

P

S

Ni

Mo

V

Ti

Alt

CEQ

3#

0.069

0.23

1.52

0.005

0.0018

0.38

0.25

0.039

0.016

0.029

0.41

[0062] The billet heating temperature is 1180℃~1220℃, and the furnace time is 440min.

[0063] Steel plate rolling process parameters are shown in Table 3-2:

[0064] Table 3-2 Rolling process parameter setting

[0065]

[0066] Example 2 uses a 400mm continuous casting slab, rolling a 130mm specification steel plate, the thickness of the waiting temperature a...

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Abstract

The invention discloses hardened and tempered S460G1+Q structural steel and a manufacturing method of the steel, and belongs to the technical field of production of low-alloy hardened and tempered steel. The manufacturing method mainly comprises the step of controlling technological parameters in the steps of steel blank heating, steel plate rolling, heat treatment and the like. The method has the beneficial effects that through composition system in reasonable design and an optimized rolling and heat treatment technology, the comprehensive mechanical property of the steel plate can be excellent, the internal quality is excellent, a flaw detection result meets the requirement of the European standard EN10160, and the flaw detection level can reach S1 / E1.

Description

technical field [0001] The invention belongs to the technical field of low-alloy quenched and tempered steel production, and in particular relates to a quenched and tempered S460G1+Q structural steel and a manufacturing method thereof. Especially for quenched and tempered S460G1+Q structural steel with -60°C impact ≥ 320J at the core of the steel plate, lamellar tear resistance (Z-direction performance) ≥ 50%, and thickness specification ≥ 100mm-150mm. Background technique [0002] In general, extra-thick plates with a thickness of 100mm and above are mainly used in various large ships, bridges, boilers, pressure vessels, construction machinery, high-rise buildings, offshore platforms and other facilities that require high performance of steel plates. Offshore platforms are special places for operations on the ocean, and their service life is 50% longer than that of ships. Therefore, the steel plates required for them must have high strength, high toughness, fatigue resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 宋欣谌铁强韩承良郑会平张学峰周希楠白学军田士平闫智平刘海龙周德光赵久梁
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD