CN1237490A

CN1237490A - Laminated steel plate and its production technique

Info

Publication number: CN1237490A
Application number: CN 99106907
Authority: CN
Inventors: 荆天辅; 张静武; 付万堂; 肖福仁
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 1999-05-16
Filing date: 1999-05-16
Publication date: 1999-12-08
Anticipated expiration: 2019-05-16
Also published as: CN1111100C

Abstract

The present invention belongs to the field of engineering material and its production technology. It relates to a new-type laminated steel plate, and is characterized by that said production process includes the following steps: before rolling, making preliminary structure treatment of single-layer slab whose chemical components are C 0.08-0.80%, Mn less than 0.90%, Si less than 0.38%, Cr less than 1.30%, Mo less than 0.90%, V less than 0.36%, P less than 0.03%, S less than 0.03% and the rest is Fe, making the single-layer slab into martensite, tempered martensite or low bainite, according to the structural state of the slab and expected performance index, making multi-pass warm-rolling, cold-rolling or controlled rolling and controlled cooling to make its total reduction greater than 50%, after rolling, making ageing treatment and regulating the matched ratio of strength and toughness to expected index. Said plate is excellent in performance, suitable for manufacturing engineering structural components of pressure container, high-pressure pipe and plate spring, etc..

Description

A kind of laminated steel plate and manufacturing technology thereof

The invention belongs to engineering materials and manufacturing technology field thereof.

Prepare the history that very-high performance metal situ composite material has the more than ten years at home and abroad by viscous deformation.Mainly concentrate on superstrength copper-based material and alumina-base material aspect abroad.As yielding non-ferrous metals such as Cu-Nb, Cu-Fe, Cu-Ag and Al-Li.Late nineteen eighties, the Spitzs and the co-worker thereof of U.S. Ames National Laboratory are prepared into Cu-N matrix material and wire rod by cold-rolling practice and cold-drawing process, and it is many and electroconductibility is higher than 70% of international standard annealed copper that intensity has improved twice.The S.I.Hong of 98 years Korea Ss and U.S. M.A.Hill have reported their new development by the Cu-Ag superstrength electro-conductive material aspect of cold drawn method preparation.Scholars such as Spitzs claim that this class advanced composite material is ' metal/metal composite is brought out in viscous deformation ' (DISC material), ' in-situ composite ', ' situ composite material ' and ' microcosmic matrix material ', and this class Al-Li ' microcosmic matrix material that the scholars such as K.T.V.Rao of California, USA university will their development ' be called the AL-Li alloy.As seen the address of this class novel material is ununified yet, to the similar report of not seeing Fe base DISC investigation of materials aspect so far.

The preparation method of this DISC plate has embodied ' INTERFACE DESIGN ', the last word of ' texture control ' and Materials science such as ' material compound reaction ins '.It is that the structural state of blank is the oversaturated sosoloid of solute appropriateness before rolling that this plate manufacturing technology is different from one of principal feature of conventional steel plates rolling technique and controlled rolling technology, for steel plate, be martensite, tempered martensite or lower bainite, the blank of conventional art then is an annealed state; In the cold rolling of multi-pass heavy reduction or warm-rolling process and after rolling, blank is not carried out anneal; Need carry out ageing treatment after rolling.Studies show that the interior living complex effect of as-annealed condition is very weak, interior living complex effect raises with sosoloid concentration and strengthens, and still, the excessive concentration blank is easy to roll and splits.With the manufacturing technology ratio of conventional laminate sheet, the technological line of DISC technology is simple, and low cost of manufacture has very high performance price ratio.

The object of the present invention is to provide a kind of interior laminated steel plate and manufacturing technology thereof of giving birth to laminar structure that have, this new engineering material has the synusia shape composite structure of the mutual equality arrangement of unique microcosmic, its manufacturing process is simple, production cost is low, mechanical property is superior, is suitable for making engineering components such as pressurized vessel, pressure piping, leaf spring.

This laminated steel plate and manufacturing technology thereof is characterized in that: Chemical Composition is C0.08～0.80%, Mn＜0.90%, Si＜0.38%, Cr＜1.30%, Mo＜0.90%, V＜0.36%, P＜0.03%, S＜0.03%, and all the other are Fe; Manufacturing process is: before rolling, the Preparedness Directorate of the single-layer slab of above-mentioned composition is treated to martensite, tempered martensite or lower bainite, carry out multi-pass warm-rolling, cold rolling or controlled rolling and controlled cooling according to the structural state of slab and the performance index of expection, make its total reduction greater than 50 percent; Carry out ageing treatment after rolling, intensity, flexible proportioning are adjusted to expectation index.

Based on traditional metal materials, particularly some ' is harmful to ' weave construction generation and the regularity that disappears and the toughening effect of weak interface in the steel plate, the present invention is with ' INTERFACE DESIGN ', the last word of Materials science such as ' texture control ' and ' material compound reaction in ' is applied to the design of ultra-high strength and toughness laminate steel composite structure, invent this interior laminated steel plate and the manufacturing new technology thereof of giving birth to laminar structure that have, solved this world-famous puzzle of ultrahigh-strength steel low stress brittle fracture in the thin plate field.

The characteristics of this laminated steel plate and manufacturing technology thereof are:

One, is parallel to and gives birth to macroscopical layered composite structure that composite structure has replaced conventional laminate sheet in the microstructure layer sheet of plate face.Give birth to composite structure spontaneous formation in the operation of rolling in this microstructure layer sheet, studies show that, its physical essence for (100) plate texture homodisperse be embedded in and form in (111) texture matrix, the interlayer weak interface is (100) cleavage surface.The bonding strength of this weak interface increases with rolling draught and reduces, and raising with the timeliness temperature strengthens, and therefore, changes the index that draught and timeliness parameter can be adjusted to expection with the intensity and the toughness of this plate.

Two, because the toughening effect of weak interface, the stretching mechanical behavior of this plate cracks in body sample and smooth sample roughly the same, the crackle area is during less than sample cross 14%, stress of fluidity and smooth sample suitable.This plate yield tensile ratio is greater than 98%, and unit elongation is greater than 10%, and relative reduction in area is 35-50%, and the ratio of stress corrosion fracture threshold value and fracture toughness is greater than 85%, from room temperature to the no ductile-brittle transition phenomenon of subzero 196 degree.

Three, traditional laminate steel is combined into through roller welding, soldering or explosive welding by multi-layered sheet, and the DISC plate is quite different, make through rolling by the individual layer plate of moderate thickness, technology is simple, production cost is low, performance is good, and all there is very quantum jump aspects such as the reliability (security) and the ratio of performance to price than conventional laminate sheet.The former is converted into macroscopical inner boundary with the thin plate outside surface, and the latter is that original position bears the microcosmic weak interface in homogeneous material.

This patented technology not only is applied to soft steel, medium carbon steel also should apply to aluminium alloy, copper alloy and titanium alloy.

Claims

1, a kind of laminated steel plate is characterized in that: Chemical Composition is C 0.08～0.80%, Mn＜0.90%, Si＜0.38%, Cr＜1.30%, Mo＜0.90%, V＜0.36%, P＜0.03%, S＜0.03%, and all the other are Fe; Manufacturing process is: before rolling, the Preparedness Directorate of above-mentioned composition single-layer slab is treated to martensite, tempered martensite or lower bainite, carry out multi-pass warm-rolling, cold rolling or controlled rolling and controlled cooling according to the structural state of slab and the performance index of expection, make its total reduction greater than 50 percent; Carry out ageing treatment after rolling, intensity, flexible proportioning are adjusted to expectation index.