High-temperature, high-pressure hydrogenation reactor is the core of the hydrocracking and hydrodesulfurization unit equipment, today most of the Cr-Mo steel, the most commonly used 2
Cr-1Mo steel. Especially the hot-wall hydrogenation reactor shell almost most of the steel manufacturing. But with the hydrogenation process technology, in particular the development of residue hydrotreating modified coal hydrogenation liquefaction process, the size of the hydrogenation reactor increasingly more demanding design conditions, general 2Cr-1Mo steel have been difficult to meet requirements. 2Cr-1Mo-V steel, has a higher strength level; and having a higher resistance to high temperature creep properties; has a higher resistance to temper embrittlement capacity, better resistance against hydrogen erosion, hydrogen embrittlement and hydrogen-induced the ability of the crack, a very high resistance to stainless steel Welding Consumables layer stripping performance and therefore be more widely used.
A hydrogenation device using domestic steel production 2Cr-1Mo-V steel plate. The steel plant I first adopted are imported sheet. Because of the differences in metallurgy and heat treatment technology, previous experience data is not fully applicable. Product before application to do a series of tests for welding process, and part of the data with the imported sheet to compare test data to develop a more rational process parameters to provide the basis for the actual production.
2Cr-1Mo-V steel, air quenching due to the high content of alloying elements tend to be larger, easy to produce cold cracking in the heat affected zone and weld Welding Alloys, at the same time due to the steel Cr, Mo, V and other strong carbide forming elements reheat The formation of cracks has a great influence. To do this, seeking welding cold cracking and reheat cracking process conditions, the main purpose of to do craft weldability test.

(Hereinafter referred to as "Boiler Works) need to use a lot of Welding Materials for manufacturing boilers, welding rod, wire, flux, oxygen for the boiler manufacturer. The choice of welding materials should be by design, technology, and production departments in accordance with GB/T5117-1995 "carbon steel electrode GB/T5293-1999 submerged arc welding of carbon steel wire and flux current national rules and standards, according to the factory by the the the boiler product and process requirements of the design, the purchasing department to provide the relevant grades of welding rod, wire, flux selection. The electrodes chosen to follow the following principles:
1 to consider the mechanical properties and chemical composition of the base material;
2 use electrodes to adapt to the conditions of service of the boiler;
3 to consider the structure and manufacturing conditions of the boiler;
4 strengthen labor protection, improve labor productivity.
Welding pressure parts should be selected the basic electrode structural welding optional acid electrode, basic electrode alternative acid electrode, high strength welding rod can substitute low strength welding rod, and not anti-alternative. Procurement electrode according to the unit's equipment, personnel, technical capacity, economic conditions and other circumstances.
Wire and flux for submerged arc welding, reasonable choice of the same wire and flux is an important part of the submerged arc welding technology.
When purchasing the factory to the welding material supply, procurement departments, relevant departments should develop appropriate welding materials management system, to manage the distribution and use of the control of welding materials.
Welding materials acceptance
Timely handling of welding consumables welding material procurement into the plant, inspection procedures, press JB/3375-2002 "boiler material into the Factory Acceptance Rules for acceptance.
Each batch of electrodes shall the electrode plant's quality certification, Special Seal confirm the inspection department of the production enterprises. Such as the welding material quality certificate for copies should be stamped on the quality certificate reseller Managers Chapter, and is recommended to be placed in the Welding Consumable  to be seized areas specified qualified before use.
Submerged arc welded carbon steel welding wire and flux must comply with the technical requirements of GB5293-85 "for submerged arc welding of carbon steel wire and flux" to use the manual and on the packaging, wire, flux quality certificate, marked out in line with the standard wire, flux models.
Inspection department inspectors should verify the accuracy of the number of verification of welding material, packaging is complete, confirm the welding material package shall be marked with the following instructions:
a standard number, welding materials, models and signage;
production and the name and trademarks;
c, production batch number and date of manufacture;
d, specifications and NW.
The welding materials packaging verify after placed in a dedicated warehouse by the inspection department of the welding material number of batch preparation of incoming inspection sampling reinspection recheck qualified inspector welding materials experiments should be to obtain data to populate " materials into the factory acceptance record "and issue a reinspection report, welding materials library curators should be qualified according to the" raw material storage lists, welding materials acceptance bags (boxes) hang (paste) qualified label.
The welding materials reinspection after passing the responsibility of division by the inspection department confirmed that timely reporting Mill Supervision Inspection (hereinafter referred to as "the supervisory inspector"), original quality certificate supervisory inspector of welding materials, welding materials reinspection report review, after passing the examination in the welding material quality certificate and reinspection report on the signature confirmation and one by one to check the batch of welding material welding materials manufacturer, place of origin, grade, batch number, date and Boiler Works reinspection report number, after passing the examination, registration for future reference.