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Low welding crack sensitivity steel with tensile strength at 700MPa level and production method thereof

A technology with low welding crack and tensile strength, used in temperature control, manufacturing converters, etc., can solve problems such as low strength, and achieve the effects of excellent welding performance, low welding crack sensitivity and low production cost

Active Publication Date: 2010-02-10
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the steel of the invention, the strength of the steel of the invention is lower

Method used

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  • Low welding crack sensitivity steel with tensile strength at 700MPa level and production method thereof
  • Low welding crack sensitivity steel with tensile strength at 700MPa level and production method thereof
  • Low welding crack sensitivity steel with tensile strength at 700MPa level and production method thereof

Examples

Experimental program
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Effect test

Embodiment

[0037] Embodiment: Carry out 9 embodiments (specification 16mm) by steel chemical composition of the present invention and production technology requirement, and with the steel grade of related technology in the background technology, as Sumitomo Metal (comparison steel 1), Anshan Iron and Steel (comparison steel 2) , Wuyang Iron and Steel Company (comparison steel 3) to conduct a comparative test. The chemical composition of the steels of the examples and the comparison is shown in Table 1, the rolling and heat treatment processes are shown in Table 2, and the mechanical properties are shown in Table 3.

[0038] Table 1 embodiment and comparative steel chemical composition (wt, %)

[0039]

[0040] Table 2 Example and comparative steel production process

[0041]

[0042] Table 3 embodiment and comparative steel properties

[0043]

[0044]

[0045] Best Example 1: The weight percentage of the chemical composition of the steel is C: 0.08, Si: 0.25-0.30, Mn: 1.70...

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Abstract

The invention provides low welding crack sensitivity steel with tensile strength at a 700MPa level and a production method thereof. The steel comprises the following two or more chemical components inpercentage by weight: C: 0.08-0.12, Si: 0.15-0.40, Mn: 1.00-2.00, P: smaller than or equal to 0.015, S: smaller than or equal to 0.006, Ni: 0.25-0.55, Mo: 0.15-0.28, V: 0.02-0.10, Cu: 0.18-0.30, Cr:0.15-0.30, Ti: 0.008-0.020 and B: 0.0007-0.0027 as well as the balance of Fe and inevitable impurities and also satisfies that Pcm is smaller than or equal to 0.24 percent and satisfies an equation: Pcm=C+Si / 30+Mn / 20+Cu / 20+Cr / 20+Ni / 60+Mo / 15+V / 10+5B (percent). The invention adopts a deep molten iron desulphurization technology, a converter top and bottom converting, vacuum treatment and continuouscasting processes and carries out rolling and hardening, tempering and thermal treatment production according to a general clean steel process.

Description

technical field [0001] The invention relates to a low welding crack sensitivity steel with a tensile strength of 700MPa and a production method thereof, belonging to the field of low alloy steel manufacturing. Background technique [0002] Before the present invention, there was a patent (JP08209238) applied by Japan NKK "Method for manufacturing high-strength steel containing Si, Mn, Mo, Ni, V, Al, Ti, B by heating to obtain excellent welding crack sensitivity", in this patent Although the steel plate possesses low crack sensitivity and high heat input resistance welding performance simultaneously, the content of Nb and V in the steel is limited by the formula 625Nb+250V+210Ceq=40+t (t is the steel plate thickness mm), which is different from that of the steel plate of the present invention. The design ideas of the components are different, and the patent does not show the specific strength level of the steel plate. [0003] The patent (JP54130426) applied by Sumitomo Meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/54C21C1/02C21C5/30C21C7/10B22D11/00C21D1/25C21D8/02C21D1/18B21B37/74
Inventor 习天辉郭爱民张开广刘文斌芮晓龙董汉雄董中波郭斌黄成红周佩丁庆丰邱保文
Owner 武汉钢铁有限公司
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