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Protective steel and production method thereof

A production method and technology of steel coils, applied in the field of metallurgy, can solve problems such as fatigue cracking of weld seams, decline in welding performance, poor cold forming performance and low-temperature impact toughness, etc.

Inactive Publication Date: 2019-03-01
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a protective steel and its production method, which is used to solve the problem that the protective steel plate in the prior art is added with relatively high content of C and Mn, and the design of Pcm is too high, which leads to the decline of welding performance and the existence of welding coldness. Problems of cracks and fatigue cracking of welds, technical problems of poor cold forming performance and low temperature impact toughness, realized protective steel with good welding performance, cold forming performance and low temperature impact toughness, and improved the technical effect of the safety performance of protective products

Method used

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  • Protective steel and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The embodiment of the present invention provides a protective steel, please refer to figure 1 , the composition mass percentage of the protective steel is C: 0.10%-0.20wt%; Si: 0.10%-0.60wt%; Mn: 0.8%-1.65wt%; Nb: 0.02%-0.05wt%; Mo: 0.3 %~0.8wt%; V: 0.05%~0.15wt%; Ti: 0.01%~0.05wt%; Al: 0.01%~0.06wt%; Cr: 0.4%~1.0wt%; B: 0.0015%~0.0025wt% ; P: ≤0.02wt%; S: ≤0.01wt%; N: ≤0.008wt%, the rest is Fe and unavoidable impurities.

[0025]Further, the mass percentage of a part of the protective steel is C: 0.13-0.20wt%, Mn: 1.0-1.5wt%, Nb: 0.03-0.04wt%, Ti: 0.01-0.03wt%, Mo: 0.3- 0.5wt%, V: 0.06-0.10wt%, Cr: 0.5-1.0wt%, B: 0.0015-0.0020wt%.

[0026] Further, the mass percentage of a part of the protective steel is C: 0.15-0.18wt%, Mn: 1.2-1.6wt%, Nb: 0.02-0.03wt%, Ti: 0.02-0.04wt%, Mo: 0.35- 0.65wt%, V: 0.05-0.13wt%, Cr: 0.55-0.08wt%, B: 0.0016-0.0022wt%.

[0027] Specifically, C in the protective steel plays an important role in the heat treatment of high-strength steel. On...

Embodiment 2

[0031] This embodiment provides a production method of protective steel, please refer to figure 2 , the method includes:

[0032] Step 110: Obtain a cast slab by smelting molten steel.

[0033] Step 120: heating the cast slab in a heating furnace, and the temperature of the cast slab is 1180-1250° C. after heating.

[0034] Further, the holding time of the slab is set to control the effective thickness of the slab within the range of 1-1.5 min / mm.

[0035] Specifically, in the embodiment of the present application, molten steel is smelted by a converter to obtain a slab, and the slab is heated in a heating furnace. After the heating, the temperature of the slab is 1180-1250°C. The holding time of the slab is set according to controlling the effective thickness of the slab within the range of 1 to 1.5 min / mm. The purpose of using a higher heating temperature is to ensure the homogenization of austenite and the formation of alloy elements such as the slab. Compounds of Ti an...

Embodiment 3

[0055] This embodiment provides a production method of steel for protection. The method is smelted in a 220-ton converter and rolled on a 1580 or 2250 hot rolling production line. The target width of the finished steel for protection is 1500 mm, and the thickness is 2-12 mm. The specific steps of this embodiment are as follows:

[0056] The molten steel is smelted in a converter to obtain a slab; the smelting process strictly controls the content of P and S to ensure the quality of the slab. The chemical composition of steel for smelting protection is shown in Table 1. Table 1 lists the chemical composition of the protective steel used in the examples of the present application.

[0057] Table 1 Chemical composition of protective steel

[0058]

[0059]

[0060] The cast slab is put into a heating furnace for heating, and the heated cast slab is put into a rolling mill for rolling to obtain a hot-rolled plate. Cool the hot-rolled sheet, adopt the front cooling mode to...

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Abstract

The invention discloses protective steel and a production method thereof. The protective steel is prepared from the following components in percentage by mass: 0.10-0.20% of C, 0.10-0.60% of Si, 0.8-1.65% of Mn, 0.02-0.05% of Nb, 0.3-0.8% of Mo, 0.05-0.15% of V, 0.01-0.05% of Ti, 0.01-0.06% of Al, 0.4-1.0% of Cr, 0.0015-0.0025% of B, no more than 0.02% of P, no more than 0.01% of S, no more than 0.008% of N, and the balance of Fe and unavoidable impurities. The problems that in the prior art, high-content C and high-content Mn are added into protective steel, Pcm is designed to be excessivelyhigh, consequently welding performance is lowered, and welding cold cracks and weld joint fatigue cracking are caused are solved, the technical problems of poor cold forming performance and poor low-temperature impact toughness are solved, and the technical effects that the protective steel has good cold forming performance and good low-temperature impact toughness, and safety performance of protected products is improved are achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a protective steel and a production method thereof. Background technique [0002] With the rapid advancement of my country's "military-civilian integration" development strategy, the demand for protective steel plates in the military and civilian fields has increased rapidly, and there is a strong demand for the development of protective steel plates with good weldability and good low-temperature impact toughness. At present, protective steel plate products are mainly used in the manufacture of armored vehicles, outer panels of off-road protective vehicles, protective outer panels of military and police equipment, cash transport vehicles, safes, etc. [0003] Due to the addition of relatively high content of C and Mn in the protective steel plate in the prior art, the design of Pcm is too high, resulting in a decrease in welding performance, problems of welding cold cracks and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38B23P15/00C21D8/02C22C33/04
CPCB23P15/00C21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38
Inventor 潘辉陈斌崔阳章军朱国森惠亚军李晓林肖宝亮刘锟
Owner SHOUGANG CORPORATION
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