Low welding crack sensitivity, quenching and tempering, high rigid plate and manufacturing method thereof

A technology of low welding cracks and high strength steel plate, which is applied in manufacturing tools, temperature control, metal rolling, etc., can solve the problems of long waiting time, low effective utilization rate of rolling mill, prolonging the time of steel plate in high temperature stage, etc. To achieve the effect of ensuring continuity, shortening production cycle and shortening time on roll

Active Publication Date: 2009-07-08
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the existing two-stage or even three-stage rolling process, it is inevitable to experience a long waiting time during the rolling process, which prolongs the rolling time of the high-temperature stage

Method used

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Embodiment Construction

[0026] The actual composition (by weight percentage) of the low-alloy high-strength steel plate of the present invention is: C 0.08%, Si 0.20%, Mn 1.20%, P 0.007%, S0.0027%, Ni 0.45%, Ti 0.015%, Mo 0.123% , V 0.057%, Pcm 0.13%, Ceq 0.33%, rolled into a 12mm steel plate. Its mechanical properties: yield strength 546MPa, tensile strength 640MPa, δ 5 It is 24%, and the transverse impact energy at -40°C is 160J.

[0027] The production method of the present invention is as follows: the heating temperature is 1200-1250° C., the rolling start temperature is 1100° C., the finishing rolling temperature is 985° C., and air cooling after rolling. The corresponding deformation system is 80→58→42→30→22→16→12mm. The quenching and tempering process conditions are: the quenching temperature is 940°C, the holding time is 45min; the tempering temperature is 640°C, the holding time is 55min, and it is air-cooled after being released from the furnace.

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Abstract

The invention pertaining to the field of low-alloy steel fabrication technique provides low welding crack sensibility quenching and tempering high-strength steel plates and a method for producing the same. The steel plate comprises the following chemical components by quality percent: C of 0.07-0.09%, Si of 0.20-0.40%, Mn of 1.20-1.40%, Alt of 0.30-0.50%, Mo of 0.10-0.20%, V of 0.04-0.06%, Ti of 0.01-0.02%, and Fe and ineluctable foreign matters of the rest; the tissue are secondary troostite and tempering sorbite.Comparing with the two-stage or three-stage rolling, the rolling adopting a austenite perfect recrystallization section has advantages of omitting a temperature-holding stage for assuring the consistency of rolling steel plates and greatly shortening the rolling time of steel blocks on the basis of simplified processes; rolling only in high-temperature regions, therefore, reducing the requirement of the ability of rolling mill equipment and simultaneously shortening the on-rolling time of the steel plates in a high temperature; room-temperature tissue obtained after rolling providing an appropriate tissue base for obtaining homogeneous tissue after quenching and tempering the steel plates.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel manufacture, and in particular relates to a quenched and tempered high-strength steel plate with low welding crack sensitivity and a manufacturing method thereof. Background technique [0002] At present, high-strength steel plates for pressure vessels with low welding crack sensitivity at home and abroad are delivered in quenched and tempered state. The steel plate delivered in the quenched and tempered state in China is generally rolled in the austenite fully recrystallized zone and the austenite non-recrystallized zone in the rolling stage. For off-line quenching and tempering heat treatment, under the condition that the composition remains basically unchanged, the microstructure before quenching and tempering has a certain degree of influence on the final microstructure and its uniformity, but the key parameters that determine the final microstructure and properties of the steel plate ...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B37/74B21B37/16C21D9/52C21D1/18
Inventor 金茹朱伏先姜中行宋增强沈一平白学军吴斌隋鹤龙陈炳张刘相华吕延春刘建明张跃飞朱志远闫智平
Owner SHOUGANG CORPORATION
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