A kind of high-strength alloy structural steel and its preparation method

A high-strength alloy and structural steel technology, applied in the field of alloy steel, can solve the problems of unstable steel plate strength, toughness performance, difficult internal quality to meet customer needs, affecting yield strength, tensile strength, etc., and achieves stable and good performance indicators. The effect of eliminating mixed crystal phenomenon and improving tensile and impact resistance

Active Publication Date: 2017-10-17
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, domestic steel mills are limited by conditions such as steel material composition design, continuous casting blank size, deformation uniformity, compression ratio, and rolling rhythm. The strength and toughness of steel plates are unstable, the pass rate is low, the production cycle is slow, and the internal quality is even worse. Difficulty meeting customer needs
For example, the patent application of CN 104451379A discloses a high-strength low-alloy niobium-vanadium structural steel and its preparation method. This product is produced from a 320mm billet, and the strength can reach more than 345MPa under the premise of ensuring a large thickness. The production cycle is short and the production rhythm Fast, but its yield is low, steel structure performance is unstable, mixed crystal phenomenon and cold bending cracking problems
The patent application of CN102392106B discloses a heat treatment process of 30CrMnSiA alloy structural steel, which improves the hardness index of structural steel; however, in order to ensure its hardness, the alloy structural steel significantly affects the improvement of indicators such as yield strength and tensile strength
The patent application of CN102337458A discloses a kind of engineering machinery steel and its production method, adopts low C (0.09~0.12%), higher Si (≥0.50%) and Ti (≥0.03%), without adding Under the premise of containing elements such as Cr, Mo and other elements, the "high temperature quenching + lower temperature tempering" process is adopted. The design of this composition system is suitable for the production of thin gauge coils, and has no guiding significance for the production of thick gauge medium and thick plates; Although the material yield ratio is basically below 0.85, the stability is poor and the fluctuation is large

Method used

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  • A kind of high-strength alloy structural steel and its preparation method
  • A kind of high-strength alloy structural steel and its preparation method
  • A kind of high-strength alloy structural steel and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0037] A preparation method of high-strength alloy structural steel, said preparation method comprising the following steps:

[0038] 1) Smelting, refining and continuous casting into billets;

[0039] 2) soaking the casting slab, the thickness of the casting slab is 80mm;

[0040] 3) Forging: at 970°C and a forging pressure of 6.4MPa, forge the slab after soaking in step 2) to extend it by 8%;

[0041] 4) Primary rolling: at 320°C and 6100KN rolling force, roll the forged product in step 3) at a speed of 6.5mm / s, the rolling direction and the forging direction in step 3) are perpendicular to each other, and the rolling pass for one time;

[0042] 5) Secondary rolling: at 620°C and 3500KN, the product after step 4) is subjected to secondary rolling at 2.5mm / s, the angle between the direction of the secondary rolling and the rolling direction of step 4) is 18°, and the rolling pass is one time;

[0043] 6) Three times of rolling: the product after the second rolling in step...

Embodiment 2

[0048] A preparation method of high-strength alloy structural steel, said preparation method comprising the following steps:

[0049] 1) Smelting, refining and continuous casting into billets;

[0050] 2) soaking the casting slab, the thickness of the casting slab is 80mm;

[0051] 3) Forging: at 975°C and 5.5MPa, forge the slab soaked in step 2) to extend it by 8%;

[0052] 4) Rolling: at 330°C and 6500KN, the product forged in step 3) is rolled at a speed of 6.8mm / s, the rolling direction is perpendicular to the forging direction of step 3), and the rolling pass is one;

[0053] 5) Secondary rolling: at 620°C and 3450KN, the product after step 4) is subjected to secondary rolling at 2.8mm / s, the angle between the direction of the secondary rolling and the rolling direction of step 4) is 16°, and the rolling pass is one time;

[0054] 6) Three times of rolling: the product after the second rolling in step 5) is placed in heat conduction oil and cooled to room temperature, ...

Embodiment 3

[0059] A preparation method of high-strength alloy structural steel, said preparation method comprising the following steps:

[0060] 1) Smelting, refining and continuous casting into billets;

[0061] 2) soaking the casting slab, the thickness of the casting slab is 80mm;

[0062] 3) Forging: at 970°C and 6.3MPa, forge the slab after soaking in step 2) to extend it by 7%;

[0063] 4) Rolling: at 330°C and 6150KN, the product forged in step 3) is rolled at a speed of 6.4mm / s, the rolling direction is perpendicular to the forging direction of step 3), and the rolling pass is one;

[0064] 5) Secondary rolling: at 620°C and 3300KN, the product after step 4) is subjected to secondary rolling at 2.7mm / s, the angle between the direction of the secondary rolling and the rolling direction of step 4) is 20°, and the rolling pass is one time;

[0065] 6) Three times of rolling: the product after the second rolling in step 5) is placed in heat-conducting oil and cooled to room temper...

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Abstract

The invention provides high-strength alloy structural steel and a preparation method thereof. The structural steel comprises, by weight, 0.14-0.2% of C, 2.1-3% of Ni, 0.05-0.1% of Bi, 0.7-1% of Mn, 1.35-1.5% of Cr, 0.25-0.3% of W, 0.07-0.1% of Al, 0.05-0.08% of Te, 0.008-0.01% of Y, and the balance Fe and inevitable impurities. The preparation method can effectively forge and roll a blank, and improves the layout of crystals inside the steel, thereby improving the performance parameter of the steel. The grain size of the structural steel is refined, the mixed crystal phenomenon is basically eliminated, the cold bending forming performance is improved, the tensile property and impact resistance are improved, the strength is high, and performance is stable. The preparation method can achieve continuous industrial production, operation is convenient, practicability is high, and cost is saved.

Description

technical field [0001] The invention relates to an alloy steel, in particular to a high-strength alloy structural steel and a preparation method thereof. Background technique [0002] Alloy structural steel is a steel that is used as mechanical parts and various engineering components and contains one or several certain alloying elements. With the development of large-scale and light-weight construction machinery, the trend of high-strength steel is obvious; while high-strength steel can greatly reduce the self-weight of equipment, it can also improve the working efficiency and service life of construction machinery and reduce the consumption of raw materials. [0003] Internationally, Sweden's SSAB medium and heavy plate production line is well-equipped, advanced in technology, and complete in variety. Quality, to better meet user needs. In China, Baosteel, Wugang, Jinan Iron and Steel, Hunan Iron and Steel, Nangang and other enterprises have also achieved rapid developme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/08C22C38/04C22C38/18C22C38/12C22C38/06C22C38/60C21D8/02C21D6/00
CPCC21D6/001C21D8/0226C22C38/002C22C38/005C22C38/04C22C38/06C22C38/08C22C38/12C22C38/18C22C38/60
Inventor 郭志元李金浩时振明
Owner SHANDONG IRON & STEEL CO LTD
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