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Low-chromium and low-molybdenum type 2000 MPa-grade non-tempered steel plate and manufacturing method thereof

A manufacturing method, a non-quenched and tempered technology, applied to low chromium and low molybdenum type 2000MPa grade non-quenched and tempered steel plates and its manufacturing field, can solve the problems of toughness and wear resistance not mentioned, achieve excellent hardenability, low alloy cost Reduced, high toughness effect

Inactive Publication Date: 2016-01-06
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example: Chinese patent document CN1861831A (application number 200610051936.2) discloses a 1100MPa grade non-quenched and tempered high-strength steel and its production method. A cold-rolled steel strip with a maximum tensile strength of 1260MPa is produced without a heat treatment process. It is higher C content (0.29-0.35%) and higher Mn content (1.40-1.75%), the highest carbon equivalent is 0.77%, and toughness and wear resistance are not mentioned in the mechanical performance index

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Low chromium and low molybdenum type 2000MPa non-quenched and tempered steel plate with a thickness of 6mm

[0021] Steel plate thickness: 6mm, the smelting chemical composition of the steel plate by mass percentage is: C: 0.16%, Si: 0.46%, Mn: 1.31%, P: 0.008%, S: 0.001%, Alt: 0.030%, Cr: 0.35%; Mo: 0.09%; the rest is Fe and unavoidable impurities.

[0022] The specific key steps and key parameters for preparing the above-mentioned steel plates are as follows:

[0023] Double-stand rolling (rough rolling and finishing rolling): the total reduction ratio is 11.6, the rough rolling has 3 passes, the reduction ratio of each pass is 50%, 52%, and 49% respectively, and the rolling speed of each pass is They are 4.6m / s, 4.2m / s, and 4.9m / s respectively; the finishing rolling consists of 3 passes, the reduction rate of the first pass is 70%, and the rolling speed of the first pass is 6.2m / s.

[0024] Thermal straightening: The straightening temperature is 385°C, the straight...

Embodiment 2

[0027] Low chromium and low molybdenum type 2000MPa non-quenched and tempered steel plate with a thickness of 10mm

[0028] Steel plate thickness: 10mm, the smelting chemical composition of the steel plate by mass percentage is: C: 0.18%, Si: 0.47%, Mn: 1.26%, P: 0.009%, S: 0.003%, Alt: 0.027%, Cr: 0.50%; Mo: 0.14%; the rest is Fe and unavoidable impurities.

[0029] The specific key steps and key parameters for preparing the above-mentioned steel plates are as follows:

[0030] Double-stand rolling (rough rolling and finishing rolling): the total reduction ratio is 10.2, rough rolling has 2 passes, the reduction ratio of each pass is 70% and 65%, and the rolling speed of each pass is 5.0 m / s, 4.4m / s; 4 passes for finishing rolling, the reduction rate of the first pass is 67%, and the rolling speed of the first pass is 5.8m / s.

[0031] Thermal straightening: The straightening temperature is 410°C, the straightening force is 1996t, the straightening speed is 20m / min, and air-...

Embodiment 3

[0034] Low chromium and low molybdenum type 2000MPa non-quenched and tempered steel plate with a thickness of 20mm

[0035] Steel plate thickness: 20mm, the smelting chemical composition of the steel plate by mass percentage is: C: 0.19%, Si: 0.45%, Mn: 1.26%, P: 0.005%, S: 0.004%, Alt: 0.022%, Cr: 0.42%; Mo: 0.11%; the rest is Fe and unavoidable impurities.

[0036] The specific key steps and key parameters for preparing the above-mentioned steel plates are as follows:

[0037] Double-stand rolling (rough rolling and finishing rolling): the total reduction ratio is 10.9, rough rolling is carried out in 3 passes, and the reduction ratios of each pass are 51%, 49%, and 47% respectively, and the rolling speed of each pass is They are 4.1m / s, 4.6m / s, 4.8m / s respectively; 3 passes of finishing rolling, the reduction rate of the first pass is 66%, and the rolling speed of the first pass is 5.9m / s.

[0038] Thermal straightening: The straightening temperature is 400°C, the straighte...

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Abstract

The invention discloses a low-chromium and low-molybdenum type 2000 MPa-grade non-tempered steel plate and a manufacturing method thereof; the contents of chromium and molybdenum are lower; and the cost is obviously low. A double-liquid quenching process is used for fully exerting the advantages of two cooling mediums, so that the hardenability is excellent, the quenching effect is better, and the strength, the hardness and the toughness of the steel plate are prominently improved. The produced steel plate is widely applied to the manufacturing field of heavy equipment key components and special parts; the carbon equivalent is not more than 0.56%; the tensile strength is more than 2000 MPa; the elongation is more than 10%; the transverse low-temperature impact power of -40 DEG C is more than 50 J; and the surface Brinell hardness is more than 58 HBW.

Description

technical field [0001] The invention relates to the technical field of manufacturing high-strength wear-resistant steel plates, in particular to a low-chromium and low-molybdenum type 2000MPa non-quenched and tempered steel plate and its manufacturing method. Background technique [0002] In recent years, a large number of high-strength wear-resistant steel plates have been used in the fields of heavy equipment manufacturing, large-scale construction machinery, and wear-resistant parts of special equipment, and the required grades are getting higher and higher. For this steel plate, in addition to requiring high strength and high toughness In addition, high hardness and good welding adaptability are also required. However, my country's current high-strength steel and wear-resistant steel standards are implemented separately. For example, the national standard GB / T16270 "Quenched and Tempered Steel Plate for High-Strength Structures" has the highest product grade of Q960F, wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C21D8/02C21D1/18
Inventor 侯登义冯勇贾希光
Owner SHANDONG IRON & STEEL CO LTD