Low-alloy high-intensity high-toughness steel and production method of low-alloy high-intensity high-toughness steel

A production method and low-alloy technology, applied in the field of metal materials, can solve problems affecting performance, plastic toughness, wear resistance, etc., and achieve the effect of simple manufacturing and processing technology

Inactive Publication Date: 2012-07-25
SANY GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 1) The material is in a casting state. If the process control is not good, there may be casting defects and affect the performance; 2) The carbon content is high, and ...

Method used

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  • Low-alloy high-intensity high-toughness steel and production method of low-alloy high-intensity high-toughness steel
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  • Low-alloy high-intensity high-toughness steel and production method of low-alloy high-intensity high-toughness steel

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Embodiment 1

[0059]Based on the composition and content of the above-mentioned low-alloy high-strength high-toughness steel, Embodiment 1 of the present invention provides a production method of low-alloy high-strength high-toughness steel to realize low-alloy high-strength high-toughness steel with a yield strength of 1000 MPa; and the low-alloy high-strength steel High-toughness steel can solve problems such as alloy chemical element content, material forming process, and increase strength level; this method performs large deformation forging on the as-cast material, and forging can break the as-cast structure, refine the grain, and increase the dislocation density. , improve strength, and at the same time heal some defects formed by casting to prevent the reduction of plasticity and toughness; after forging, quenching + high temperature tempering heat treatment is carried out to obtain tempered sorbite structure, which can obtain high toughness while maintaining high strength.

[0060] ...

Embodiment 2

[0076] Step 1. Cast a low-alloy high-strength high-toughness steel ingot with the composition shown in Table 1, and the specification of the ingot is Φ100×110mm, and control the process of melting and pouring.

[0077] Table 1 Low alloy steel chemical composition (wt%)

[0078] C

S

P

mn

Si

Cr

Ni

Mo

Al

La

0.25

0.003

0.012

0.72

0.32

1.04

0.83

0.31

0.039

0.0009

[0079] Step 2, forging the ingot obtained in Step 1.

[0080] In the embodiment of the present invention, the heating temperature for blank forging is 1160-1200°C, the final forging temperature is 700°C, the deformation per firing is not less than 30%, and the cross-sectional specification of the forging is 16×80mm.

[0081] Step 3. Heating the forging obtained in step 2 to 930° C., keeping it warm for 3 hours, and cooling to room temperature in the air; this process is a normalizing process.

[...

Embodiment 3

[0089] Step 1. Cast a low-alloy high-strength high-toughness steel ingot with the composition shown in Table 3, and the specification of the ingot is Φ100×110mm, and control the melting and pouring process.

[0090] Table 3 Chemical Composition of Low Alloy Steel (wt%)

[0091] C

S

P

mn

Si

Cr

Ni

Mo

Al

La

0.29

0.004

0.017

0.62

0.40

0.85

0.82

0.25

0.046

0.0005

[0092] Step 2, forging the ingot obtained in Step 1.

[0093] In the embodiment of the present invention, the heating temperature for blank forging is 1160-1200°C, the final forging temperature is 750°C, the deformation per firing is not less than 30%, and the cross-sectional specification of the forging is 16×80mm.

[0094] Step 3. Heating the forging obtained in step 2 to 930° C., keeping it warm for 3 hours, and cooling to room temperature in the air; this process is a normalizing process.

[...

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Abstract

The invention discloses low-alloy high-intensity high-toughness steel and a production method of low-alloy high-intensity high-toughness steel. The method comprises the following work procedures of: the casting work procedure: the casting is carried out according to the following ingredients and contents to obtain low-alloy steel cast ingots: 0.15 to 0.30 weight percent of C elements, 0.30 to 0.70 weight percent of Si elements, 0.60 to 1.00 weight percent of Mn elements, 0.60 to 1.10 weight percent of Cr elements, 0.50 to 1.00 weight percent of Ni elements, 0.20 to 0.60 weight percent of Mo elements and the balance Fe and unavoidable impurities; the forging work procedure: the low-alloy steel cast ingots are forged, in addition, the blank opening forging heating temperature is 1160 DEG C to 1200 DEG C, the final forging temperature is 650 DEG C to 900 DEG C, and the deformation in each firing time is not smaller than 30 percent; and the heat treatment work procedure: the temperature of the forged and formed forgings is raised to 900 to 940 DEG C to be subjected to normalizing, the temperature is raised to 880 to 920 DEG C for carrying out quenching after the normalizing treatment, the temperature is raised to 530 to 600 DEG C for carrying out high-temperature tempering after the quenching treatment, and the low-alloy high-intensity high-toughness steel is obtained. In the embodiment of the invention, the low-alloy high-intensity high-toughness steel has high intensity and high toughness.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a low-alloy high-strength high-toughness steel and a production method thereof. Background technique [0002] Due to its excellent mechanical properties and relatively low production and use costs, low-alloy steel is widely used in the field of construction machinery; currently the most used type of steel, the tensile strength is usually below 1000MPa, and its impact energy is low, it is difficult to Adapt to increasingly severe working conditions; therefore, it is necessary to further improve the plasticity and toughness of low alloy steels, especially the impact toughness at low temperature conditions, so that low alloy steels can be used at lower temperatures use. [0003] In the prior art, a kind of strong toughness low-alloy structural steel and its production method are disclosed. The low-alloy structural steel contains alloy elements such as Cr, Ni, Mo, Cu, V, Nb, etc.; Th...

Claims

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Application Information

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IPC IPC(8): C22C38/44C21D8/00
Inventor 李杰邵威朱文旭
Owner SANY GRP
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