GradeUNS Grade BarsWelded Tube. Seamless Tube.   Flanges    Plates    Fittings  3000 LBS Fittings
Gr.660   Stock .Av          
AlloyB3 N10665 .Av .Av .Av   .Av    
Alloy20 N08020 Stock   .Av .Av .Av .Av  
Alloy31 N08031 .Av            
Alloy C276 N10276 Stock Stock Stock Stock Stock Stock  
Alloy X750 N07750 .Av            
Alloy 718 N07718 .Av            
Alloy C22 N06022 .Av .Av .Av .Av .Av .Av  
Alloy C4 N06455 .Av .Av .Av .Av .Av .Av  
Nickel 200/ 201 N02200 / N02201 .Av .Av .Av .Av .Av .Av  
Alloy 600 N06600 Stock Stock Stock .Av .Av .Av  
Alloy 601 N06601 Stock Stock Stock .Av .Av .Av  
Alloy 625 N06625 Stock .Av .Av .Av .Av .Av  
Alloy 800 HT N08811 Stock .Av .Av .Av .Av .Av  
Alloy 825 N08825 Stock Stock Stock Stock Stock Stock  
Alloy 400 N04400 Stock .Av .Av .Av .Av .Av  
K500 N05500 Stock            
Nitronic 50® S20910 .Av            
17.4 PH® S17400 Stock            
Duplex 2205  S31803


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Superduplex 32760 S32760 Stock   Stock Stock   Stock  
Superduplex 32750 S32750 Stock   Stock Stock .Av Stock  
904L® N08904 .Av Stock Stock Stock .Av Stock  
Uranus®B26   .Av   .Av .Av .Av .Av  
254SMO® S31254 Stock   Stock Stock .Av Stock  
AL6XN® S30409 .Av   .Av .Av      
310S S31008     Stock     Stock  
316L S31603   Stock Stock Stock   Stock  
316H S31609     .Av .Av      
316Ti S31635 .Av .Av .Av .Av .Av .Av  
317L S31703 Stock       .Av    
321 S32100 Stock   .Av .Av .Av .Av  
347 S34700 Stock   .Av .Av      
347H S34709 Stock   .Av .Av      
410 S41008 .Av       .Av    
409 S40900         .Av    
Ti Gr. 1 R50250 .Av       .Av    
Ti Gr. 2 R50400 Stock Stock Stock   Stock .Av  
Ti Gr. 5 R56400 .Av            
Ti Gr. 7 R52400 .Av            
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Aceros y Equipos S.L., Acequisa was founded in 1983 in Burgos by professionals in the field of stainless steel as a wholesaler of special stainless steels, nickel, titanium and other alloys.

During these more than 25 years of history, Acequisa has earned its position as a leader in the national distribution of these products. Due to the high quality of our service, our customers have always found an ally in us when it comes to finding the best purchasing conditions of special stainless steels, nickel, titanium and other special alloys. Thanks to our more than 15.000 stock/inventory references, our wide stock and our agreements with the best and largest manufactures and wholesalers in the world, we are able to satisfy all our customers needs. Acequisa’s permanent stock is available to its customers in grades such as Duplex, Superduplex, Hastelloy, Incoloy, and in products such as seamless and welded pipes and tubes, bars, sheets, flanges, elbows, tees, reducers and any other type of fittings.





Acequisa mainly stores and commercializes special stainless steels as well as nickel, titanium and other alloys, materials with a very specific and technical use due to their special resistance features.

The grades commercialized by Acequisa are used in environments where resistance to high temperature, corrosion and pressure is essential. We have been specializing in grades such as Duplex, Superduplex, superaustenitic stainless steels, nickel alloys, for over 25 years. We have a permanent stock of these grades on products like seamless and welded pipe and tube, bars, sheets, flanges, elbows, tees, reducers and any other type of fittings.





Most of Acequisa’s/our customers are present in highly demanding industrial environments, such as energy industry –Thermal, nuclear, hydroelectric – chemical and oil/gas, shipbuilding, water technology – desalination, depuration -, where special materials are used and the highest quality standards required. Acequisa is aware of this need of top quality, both on the products purchased and the service received, so we always meet our customers’ expectations with the most professional and effective service.





Thanks to our wide stock and our agreements with the best and largest manufacturers and wholesalers in the industry, we are able to supply the requested materials with the best delivery dates, quantities and prices.

Our warehouses and logistic platforms located in Burgos (North of Spain) and Las Palmas de Gran Canaria (Canary Islands), allow us to deliver by land, seaway or airway with the best conditions. Spain is characterized by the largest length of coastline in the European Union. Thanks to its geographic location, next to the axis of one of the most important shipping lanes in the world, it provides excellent intermodal connections and is a strategic location for international seafreight and airfreight business.

Our services also include the cutting of materials by laser, water jet and plasma. We offer immediate delivery, since bars and tube/pipe cuttings are performed in our premises, always under the highest quality controls.

Nickel Alloys

Nickel alloys offer a combination of excellent corrosion resistance, strength, toughness, metallurgical stability, fabricability and weldability. Many Nickel alloys additionally posses outstanding heat resistance, making them ideal choice for applications requiring chemical resistance and strength at elevated temperatures.

Nickel alloys represent a step up from conventional stainless steels and superaustenitic iron-based alloys in resisting corrosion by a wide spectrum of acids, alkalis and salts. An outstanding attribute of nickel alloys is exceptional resistance to aqueous solutions containing halide ions. In that regard, nickel alloys are far superior to austenitic stainless steels, which are notoriously prone to attack by wet chlorides and fluorides.

This superior corrosion behavior of nickel alloys manifests itself not only in term of lower metal loss, but in the ability to better withstand localized attack, notably pitting/crevice corrosion, intergranular attack and stress corrosion cracking. These forms of localized attack, more so than general thinning, account for the majority of corrosion-induced failures in the chemical industry.

Nickel alloys owe their corrosion resistance parity to the inherent lower reactivity of nickel relative to iron, as measured by its more noble oxidation potential in the EMF series. Similar to stainless steels, chromium-containing nickel alloys have the capability to passivate.

An added advantage of nickel over iron is the ability to accept fractions of alloying elements without forming bridle phases. Common alloying additions for enhanced corrosion resistance are chromium, molybdenum and copper.

A number of other applications for nickel alloys involve the unique physical properties of special-purpose nickel base or high-nickel alloys. These include:

  1. Heat-resistant applications: Nickel-base alloys are used in many applications where they are subjected to harsh environments at high temperatures. Nickel-chromium alloys or alloys that contain more than about 15% Cr are used to provide both oxidation and carburization resistance at temperatures exceeding 760ºC

  2. Corrosion resistance: Nickel-base alloys offer excellent corrosion resistance to a wide range of corrosive media. However, as with all types of corrosion, many factors influence the rate of attack. The corrosive media itself is the most important factor governing corrosion of a particular metal.

  3. Low-expansion: Nickel was found to have a profound effect in the thermal expansion of iron. Alloys can be designed to have a very low thermal expansion or display uniform and predictable expansion over certain temperature ranges.

  4. Electrical resistance: Several alloys systems based on nickel or containing high nickel contents are used in instruments and control equipment to measure and regulate electrical characteristics (resistance alloys) or are used in furnaces and appliances to generate heat (heating alloys)

  5. Soft Magnetic: The high-nickel alloys (about 79% Ni with 4 to 5% Mo; bal Fe) have high initial permeability and low saturation induction.

  6. Shape memory: Metallic materials that demonstrate to return to their previously shape when subjected to the appropriate heating schedule are referred to as shape memory alloys. Nickel-titanium alloys (50% Ni – 50% Ti) are one of the few commercially important shape memory alloys.

Commercial forms:

  • Pure Nickel: Nickel 200/201:

  • Nickel – Copper Alloys: Alloy 400, Alloy K500

  • Nickel-Chromium and Nickel-Chromium-Iron Alloys: Alloy 600, X750, Alloy 625, Alloy C22, Alloy C276

  • Iron-Nickel-Chromium Alloys: Alloy 800, 800HT,

  • Controlled-expansion alloys: Alloy 902…

Nickel alloys are more expensive than stainless steels. However, economic comparisons on a first-cost, rather tan on a life-cycle basis, can be deceiving. For instance, Ni-Cr-Mo alloys cost roughly five times as much as 18Cr-8Ni stainless steels and about twice as much as super-austenitic stainless steels.

Stainless austenitic and superaustenitic

Stainless steels are iron base alloys that include chromium, carbon and other elements, mainly nickel, molybdenum, manganese, silicon and titanium. Chromium, present in no less than 10%, provides higher corrosion resistance than a simple iron alloy. This feature is due to the passivation of the alloys in an oxidizing environment.

They are very used on a wide range of industrial applications due to their excellent mechanical properties and also their corrosion resistance. There are five different families; four of them are classified by their particular crystal structure formed in the alloy: Austenitic, ferritic, martensitic and duplex (austenitic and ferritic); while the fifth correspond to precipitation-hardened alloys, based more on the type of heat treatment used than the crystal structure.

Heat treatments were performed in stainless steels to produce changes on their physical and mechanical properties, their residual stress level and restore their maximum corrosion resistance. Very often with the same treatment achieves a satisfactory corrosion resistance and excellent mechanical properties.

Austenitic and superaustenitic are more resistance to corrosion than ferritic and martensitic, because chromium carbides decompose and Chromium and Carbon remain in solid solution by rapid cooling from high temperature. However, if it is cooled slowly, as in welding, between 870 and 600ºC, chromium carbides precipitated in grain boundary leaving Chromium poor the area beside the edge, which makes the phenomenon called “intergranular corrosion”. This can be fixed downing to the lowest the Carbon content (0.03%), or adding Niobium or Titanium; these elements have a higher tendency to form carbides than Carbon, allowing it remain in solid solution on the iron and thus maintain its ability to resist corrosion.

They are stainless steel with high nickel content (4 to 37%) to stabilize the austenite. They could also content molybdenum, copper, silicon, aluminum, titanium and niobium, elements that are used to obtain certain characteristics.

Main properties of Austenitic and Superaustenitic stainless due to FCC structure, which provides high ductility, formability, toughness and excellent impact resistance. They can be hardened by cold working, but not by heat treatment, cause nickel stabilizes the austenite at room temperature.

Oxidation resistance is far superior to other types of stainless steels due to above reasons, which favors welding procedures that can be done perfectly; they are very used to manufacture tubes for the chemical and petrochemical industry, where corrosion is a crucial service condition.

They tend to be non-magnetic and sometimes, when they have been cold-worked they can be. Cold forming is a way to improve their mechanical properties, specifically yield strength that is relatively low compared to other materials. Cold-working and the section reduction increase the yield strength and the tensile strength limits, while decrease the steel elongation.


They are two-phase austenitic-ferritic alloys, with yield strength twice than austenitic steels and a similar corrosion resistance. This allows them support greater efforts at work or decrease size of components, which means significant savings. They have excellent toughness than ferritic steels.

Titanium and exotic alloys

The combination of high strength-to-weight ratio, excellent mechanical properties, and corrosion resistance makes Titanium the best material choice for many critical applications.

Today, Titanium alloys are used for demanding applications such as static and rotating gas turbine engine components. Some of the most and highly-stressed civilian and military airframe parts are made of these alloys.

The primary reasons for using titanium-base products are its outstanding corrosion resistance of titanium and its useful combination of low density (4.5g/cm3) and high strength. The strengths vary from 480MPa for some grades of commercial titanium to about 1100MPa for structural titanium alloy products and over 1725MPa for special such as wire and springs.

Another important characteristic of titanium-base materials is the reversible transformation of the crystal structure alpha (hexagonal close-packed) structure to beta (body-centered cubic) structure when the temperature exceed certain level. This allotropic behavior, which depends in the type and amount of alloys contents, allows complex variations in microstructure and more diverse strengthening opportunities than those of other nonferrous alloys such as coppers or aluminum.

Titanium has the following advantages:

  • Good strength

  • Resistance to erosion and erosion-corrosion

  • Very thin, conductive oxide surface film.

  • Hard, smooth surface that limits adhesion of foreign materials.

  • Surface promotes drop wise condensation.

ACEQUISA ACEROS Y EQUIPOS S.L. is a supplier of specialty stainless steels and nickel alloys, titanium and other © - All rights reserved