The base material of the metal composite plate can be Q235B, Q235R, Q345R, 15CrMoR and so on. Cladding materials: austenitic stainless steel, 2205, 2507, 904L, 254SMO, AL6XN, titanium and titanium alloys, nickel and nickel-based alloys, copper, zirconium, tantalum, of which zirconium composite plates and tantalum composite plates need to be set up with a transition layer, for example, tantalum-zirconium-titanium-steel composite plates: Ta1/R60702/TA1/Q345R, which are widely used in high concentration of sulfuric acid and nitric acid. Theoretically, all special metals with ductility can be used to make composite plates. Metal composite plate has been used in a large number of petrochemical, coal chemical, fluorine chemical, fine chemical, acetic acid acetic anhydride, PTA, chlor-alkali, salt, metallurgy, medicine, electricity and other fields. How is the metal composite plate made? There are two main methods for industrialized production of metal composite plates: explosion composite and rolling composite.
(A) explosion composite
Explosive composite plate production process is to overlap the composite layer placed on the substrate, composite layer and the substrate spaced out a certain distance. Composite layer above the laying of explosives - medicine, ignition of explosives - the energy of the explosion, making the upper composite layer of high-speed impact on the substrate, instantaneous generation of high temperature and high pressure so that the interface of the two materials to realize solid-phase metallurgical welding combination. Ideally, the interface of each square millimeter of the shear strength of up to 400 Mpa, enough to be used as follow-up equipment processing needs. Explosive composite plate production is generally carried out in remote outdoor workshops, due to the working characteristics of explosives, there are certain requirements for the weather. This is a factor that affects its efficiency.
(ii) Rolled composite
Rolled composite plate process is to the substrate and composite layer in a physically pure state, the use of medium plate mill or hot rolling mill rolling production. In the rolling process of the two metal diffusion to achieve complete metallurgical combination. Of course, in order to improve the wetting effect of the composite interface, improve the bonding strength, in the physical and chemical treatment of the interface, but also to take a series of technical measures. Rolling process makes the composite plate to realize continuous large-scale production, not subject to weather restrictions, high production efficiency, low cost, large product width is its main feature.
(iii) Implementation standards
The above two composite plate manufacturing methods are the implementation of NB/T 47002-2019 pressure vessels with explosion welded composite plate standards.
(D) explosion composite features
Explosive composite and rolled composite plate of their respective process characteristics?
First of all, the explosion composite characteristics:
1, because the explosion composite is cold processing, so it can produce a variety of metal composite plate, such as titanium, copper, nickel, aluminum, etc. and a variety of non-ferrous metals.
2, explosion composite can produce metal composite plate total thickness can reach several hundred millimeters thick metal composite plate, such as some large-scale water conservancy project base and ultra-thick tube plate. But not suitable for the production of thin composite steel plate with a total thickness of less than 8 mm.
3, explosion composite using explosive - drug energy production, the environment will cause vibration, noise and smoke pollution. But the equipment investment is small, the size of the domestic explosion production plant hundreds.
4, small-scale production and large-scale production can be, such as two or three tube plate, a variety of shaped size combination. Cladding can be spliced first grinding, after the explosion.
5, due to weather and other process conditions, explosion composite production efficiency is low.
(E) rolling composite features
1, the use of large plate mill and hot rolling mill production, so high production efficiency, fast delivery. Product width is large, the thickness of free combination. Stainless steel cladding thickness of 0.5mm or more can be produced. But the equipment and rolling production line investment is large, so fewer manufacturers.
2, due to the limitations of the rolling compression ratio, rolling production is not yet able to produce composite steel plate with a thickness of 50mm or more, and is not convenient for the production of a variety of small quantities, round and other special shapes of composite plates.
3, the advantages of rolling composite plate 6, 8, 10 mm thin specification composite plate. Under the conditions of hot continuous rolling, composite coil production can be realized, and then according to the need for sizing length, to meet more user needs.
It is not difficult to find that the two production processes of different composite plates have their own distinctive features. Let the user to reduce costs, rational use of materials which is fundamental. From the costing, rolling is calculated according to the tonnage. And explosion is calculated according to the explosion area. Industry professionals point of view: the thicker the steel plate explosion composite has the advantage, the thinner the steel plate rolled composite way to prevail, thick and thin to 20mm as the boundary.
