Economy + Corrosion Resistance: Fabrication of Hastelloy B-3 alloy and Steel Explosive Composite Plates
Hastelloy B-3 is a new member of the nickel-molybdenum alloy family, which has excellent corrosion resistance to any temperature and concentration of hydrochloric acid. It also has excellent corrosion resistance to sulfuric acid, acetic acid, anthranilic acid, phosphoric acid and other non-oxidizing media. Due to the adjustment of its chemical composition, its thermal stability has been improved compared with that of B-2 alloy. B-3 alloy has high resistance to pitting corrosion, stress corrosion cracking, knife corrosion and corrosion in the heat affected zone of welding.
At present, most of the HASTELLOYB-3 alloy-steel composite plates used in Chinese pressure vessels rely on imports from abroad, which are not only expensive, but also have a long delivery period, which is not conducive to the promotion and application of HASTELLOY B-3 alloy-steel composite plate equipment in China.
Shanghai HY Industry Co., Ltd has started the research and development, trial production and production of Hastelloy B-3 – steel explosive composite plate. This type of explosive composite plate consists of Hastelloy B-3 composite plate and steel substrate explosive composite, HASTELLOY B-3 alloy plate as a layer in contact with the corrosive medium, steel plate as the other layer to bear the load. Hastelloy B-3 composite plate thickness of 2-5 mm, steel substrate thickness of 10-50 mm. by using a certain gap between the composite plate HASTELLOY B-3 alloy and the base steel plate, through the parallel method of installation arrangement.
When the explosive placed on top of the composite plate is detonated by the detonator, the explosive chemical reaction of the explosive is accelerated over a period of time to burst speed in the composite plate forward propagation. With the advance of the detonation wave and the explosion products of the rapid expansion, most of the chemical energy of the explosive into high-speed movement of the detonation wave and explosion products. Subsequently part of this kinetic energy is transferred to the composite plate, thus promoting the composite plate to the substrate high-speed movement, and the formation of a certain bending angle, the composite plate and the substrate then in contact with the point of impact in turn, the formation of the base, the effective combination between the composite plate, to achieve a large area of continuous welding.
After the explosion composite composite plate, to meet the “NB/T47002-2009 pressure vessel with explosive welding composite plate Part II: nickel – steel composite plate” standard and ASME SA-264 “nickel and nickel-based alloy composite steel plate” standard requirements, through the explosion composite on the detonation point after patch welding can make the fit rate of more than 100%, the minimum shear strength is much greater than 210Mpa.
After the explosion composite, generally subject to heat treatment, leveling, and surface mechanical polishing treatment.
Additional Tips on B-3 alloy properties：
As a result of the improvements, HASTELLOY B-3 alloy thermal stability has improved significantly, it is possible to minimize the problems associated with the processing of previous B series alloy components. This is due to the fact that in B-3 alloy, there is little tendency for harmful intermetallic phases to form, making it more ductile during heating and subsequent thermal cycling in various forms.
B-3 alloy is a low carbon alloy and control of grain size can be achieved by controlling the final forging temperature. When heated at 1230°C, forging and other thermal processes can be performed if sufficient time is allowed for the overall homogenization of the part.
Tests have shown that B-3 alloy in boiling hydrochloric acid at a concentration of 20% when the cold compression deformation is not greater than 50%, compared to its solution heat treatment its ability to resist uniform corrosion. B-3 alloy can be welded by all common welding methods, but oxyacetylene welding and submerged arc welding methods are not recommended for parts used in corrosive environments. Special care should be taken to take certain precautions when welding to prevent excessive heat input.
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