Unmodified high-toughness low-temp steel for high-energy line welding and its production method

A technology of large line energy welding and production method, applied in the field of low-alloy steel manufacturing, can solve the problems of low yield and high production cost, achieve the effects of excellent strength and toughness, simplify production process, and ensure safety and reliability

Inactive Publication Date: 2002-03-06
武钢集团有限公司
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Problems solved by technology

The disadvantage of this patent is that the production process control requirements are extremely strict, so the finished product rate is very low and the production cost is high

Method used

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Embodiment 1

[0027] Example 1: According to the composition requirements of the steel of the present invention, three batches of the steel of the present invention were smelted in a vacuum induction electric furnace, and the steel ingots were heated to 1280°C and rolled out. The opening temperatures were 1180°C, 1200°C, and 1220°C, respectively. The reduction rate is 68 to 75%, and the finishing temperature is 830, 850, and 870°C, respectively. The thickness of the rolled steel plate is 16, 20, and 24mm respectively. The normalizing temperature is 890, 920, 950℃, and the normalizing heat preservation time is 46, 50, 54 minutes; the tempering temperature is 590, 630, 670℃, and the tempering heat preservation time is 56, 60, 64 minutes, respectively. Subsequently, the mechanical properties of the three steel plates were tested, and the impact toughness of the steel plate at -50℃ and the impact toughness of the steel plate at -50℃ HAZ after 60kJ / cm high heat input welding were tested, and compare...

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Abstract

A high-toughness low-temp steel for high-energy linear welding contains C, Si, Mn, P, S, Al, Ti, N, B, Fe, and one or more of Cu, Ni, Nb, V, Mo and RE. The compound Ti-B oxide is used to obtain high welding performance under high linear energy (greater than 50 KJ / cm). Its low content of C and impurities can improve its toughness. Its advantags are high weld performance and low-temp toughness, andlow cost. It is suitable for low-temp spherical tank and large containers.

Description

【Technical Field】 [0001] The invention relates to a large heat input welding non-quenched and tempered high toughness low temperature steel and a production method thereof, belonging to the field of low alloy steel manufacturing. 【Background technique】 [0002] Before the present invention, as in 1990, the Japanese steel company NIPPON STEELCORP (YAWA) applied for a patent (JP2837732 JP03264614) "Hot continuous casting slab has a special chemical composition, a high toughness steel cooled at a special speed and reheated before rolling" In the composition requirements, Ni: 0.2~1.5%, Cu: 0.2~1.5%, and meet Mn / 6+(Cu+Ni) / 15=0.28~0.40%, B×10000+Nb×1000=4~10, Ti / N=2.0~ 4.0, when the hot cast slab is at 1000~600℃, the cooling rate is ≤5℃ / min, and the heating temperature before rolling is ≤1150℃. Its chemical composition requirements are extremely strict, and the casting billet cooling rate and casting billet heating temperature are also strict requirements, so the cooling conditions and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/14
Inventor 陈晓习天辉董汉雄童明伟
Owner 武钢集团有限公司
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